kafka Values 源码
kafka Values 代码
文件路径：/connect/api/src/main/java/org/apache/kafka/connect/data/Values.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.kafka.connect.data;
import org.apache.kafka.common.utils.Utils;
import org.apache.kafka.connect.data.Schema.Type;
import org.apache.kafka.connect.errors.DataException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.math.BigDecimal;
import java.nio.ByteBuffer;
import java.text.CharacterIterator;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.text.StringCharacterIterator;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Base64;
import java.util.Calendar;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Set;
import java.util.TimeZone;
import java.util.regex.Pattern;
/**
* Utility for converting from one Connect value to a different form. This is useful when the caller expects a value of a particular type
* but is uncertain whether the actual value is one that isn't directly that type but can be converted into that type.
*
* <p>For example, a caller might expects a particular {@link org.apache.kafka.connect.header.Header} to contain an {@link Type#INT64}
* value, when in fact that header contains a string representation of a 32-bit integer. Here, the caller can use the methods in this
* class to convert the value to the desired type:
* <pre>
* Header header = ...
* long value = Values.convertToLong(header.schema(), header.value());
* </pre>
*
* <p>This class is able to convert any value to a string representation as well as parse those string representations back into most of
* the types. The only exception is {@link Struct} values that require a schema and thus cannot be parsed from a simple string.
*/
public class Values {
private static final Logger LOG = LoggerFactory.getLogger(Values.class);
private static final TimeZone UTC = TimeZone.getTimeZone("UTC");
private static final SchemaAndValue NULL_SCHEMA_AND_VALUE = new SchemaAndValue(null, null);
private static final SchemaAndValue TRUE_SCHEMA_AND_VALUE = new SchemaAndValue(Schema.BOOLEAN_SCHEMA, Boolean.TRUE);
private static final SchemaAndValue FALSE_SCHEMA_AND_VALUE = new SchemaAndValue(Schema.BOOLEAN_SCHEMA, Boolean.FALSE);
private static final Schema ARRAY_SELECTOR_SCHEMA = SchemaBuilder.array(Schema.STRING_SCHEMA).build();
private static final Schema MAP_SELECTOR_SCHEMA = SchemaBuilder.map(Schema.STRING_SCHEMA, Schema.STRING_SCHEMA).build();
private static final Schema STRUCT_SELECTOR_SCHEMA = SchemaBuilder.struct().build();
private static final String TRUE_LITERAL = Boolean.TRUE.toString();
private static final String FALSE_LITERAL = Boolean.FALSE.toString();
private static final long MILLIS_PER_DAY = 24 * 60 * 60 * 1000;
private static final String NULL_VALUE = "null";
static final String ISO_8601_DATE_FORMAT_PATTERN = "yyyy-MM-dd";
static final String ISO_8601_TIME_FORMAT_PATTERN = "HH:mm:ss.SSS'Z'";
static final String ISO_8601_TIMESTAMP_FORMAT_PATTERN = ISO_8601_DATE_FORMAT_PATTERN + "'T'" + ISO_8601_TIME_FORMAT_PATTERN;
private static final Set<String> TEMPORAL_LOGICAL_TYPE_NAMES =
Collections.unmodifiableSet(
new HashSet<>(
Arrays.asList(Time.LOGICAL_NAME,
Timestamp.LOGICAL_NAME,
Date.LOGICAL_NAME
)
)
);
private static final String QUOTE_DELIMITER = "\"";
private static final String COMMA_DELIMITER = ",";
private static final String ENTRY_DELIMITER = ":";
private static final String ARRAY_BEGIN_DELIMITER = "[";
private static final String ARRAY_END_DELIMITER = "]";
private static final String MAP_BEGIN_DELIMITER = "{";
private static final String MAP_END_DELIMITER = "}";
private static final int ISO_8601_DATE_LENGTH = ISO_8601_DATE_FORMAT_PATTERN.length();
private static final int ISO_8601_TIME_LENGTH = ISO_8601_TIME_FORMAT_PATTERN.length() - 2; // subtract single quotes
private static final int ISO_8601_TIMESTAMP_LENGTH = ISO_8601_TIMESTAMP_FORMAT_PATTERN.length() - 4; // subtract single quotes
private static final Pattern TWO_BACKSLASHES = Pattern.compile("\\\\");
private static final Pattern DOUBLE_QUOTE = Pattern.compile("\"");
/**
* Convert the specified value to an {@link Type#BOOLEAN} value. The supplied schema is required if the value is a logical
* type when the schema contains critical information that might be necessary for converting to a boolean.
*
* @param schema the schema for the value; may be null
* @param value the value to be converted; may be null
* @return the representation as a boolean, or null if the supplied value was null
* @throws DataException if the value could not be converted to a boolean
*/
public static Boolean convertToBoolean(Schema schema, Object value) throws DataException {
return (Boolean) convertTo(Schema.OPTIONAL_BOOLEAN_SCHEMA, schema, value);
}
/**
* Convert the specified value to an {@link Type#INT8} byte value. The supplied schema is required if the value is a logical
* type when the schema contains critical information that might be necessary for converting to a byte.
*
* @param schema the schema for the value; may be null
* @param value the value to be converted; may be null
* @return the representation as a byte, or null if the supplied value was null
* @throws DataException if the value could not be converted to a byte
*/
public static Byte convertToByte(Schema schema, Object value) throws DataException {
return (Byte) convertTo(Schema.OPTIONAL_INT8_SCHEMA, schema, value);
}
/**
* Convert the specified value to an {@link Type#INT16} short value. The supplied schema is required if the value is a logical
* type when the schema contains critical information that might be necessary for converting to a short.
*
* @param schema the schema for the value; may be null
* @param value the value to be converted; may be null
* @return the representation as a short, or null if the supplied value was null
* @throws DataException if the value could not be converted to a short
*/
public static Short convertToShort(Schema schema, Object value) throws DataException {
return (Short) convertTo(Schema.OPTIONAL_INT16_SCHEMA, schema, value);
}
/**
* Convert the specified value to an {@link Type#INT32} int value. The supplied schema is required if the value is a logical
* type when the schema contains critical information that might be necessary for converting to an integer.
*
* @param schema the schema for the value; may be null
* @param value the value to be converted; may be null
* @return the representation as an integer, or null if the supplied value was null
* @throws DataException if the value could not be converted to an integer
*/
public static Integer convertToInteger(Schema schema, Object value) throws DataException {
return (Integer) convertTo(Schema.OPTIONAL_INT32_SCHEMA, schema, value);
}
/**
* Convert the specified value to an {@link Type#INT64} long value. The supplied schema is required if the value is a logical
* type when the schema contains critical information that might be necessary for converting to a long.
*
* @param schema the schema for the value; may be null
* @param value the value to be converted; may be null
* @return the representation as a long, or null if the supplied value was null
* @throws DataException if the value could not be converted to a long
*/
public static Long convertToLong(Schema schema, Object value) throws DataException {
return (Long) convertTo(Schema.OPTIONAL_INT64_SCHEMA, schema, value);
}
/**
* Convert the specified value to an {@link Type#FLOAT32} float value. The supplied schema is required if the value is a logical
* type when the schema contains critical information that might be necessary for converting to a floating point number.
*
* @param schema the schema for the value; may be null
* @param value the value to be converted; may be null
* @return the representation as a float, or null if the supplied value was null
* @throws DataException if the value could not be converted to a float
*/
public static Float convertToFloat(Schema schema, Object value) throws DataException {
return (Float) convertTo(Schema.OPTIONAL_FLOAT32_SCHEMA, schema, value);
}
/**
* Convert the specified value to an {@link Type#FLOAT64} double value. The supplied schema is required if the value is a logical
* type when the schema contains critical information that might be necessary for converting to a floating point number.
*
* @param schema the schema for the value; may be null
* @param value the value to be converted; may be null
* @return the representation as a double, or null if the supplied value was null
* @throws DataException if the value could not be converted to a double
*/
public static Double convertToDouble(Schema schema, Object value) throws DataException {
return (Double) convertTo(Schema.OPTIONAL_FLOAT64_SCHEMA, schema, value);
}
/**
* Convert the specified value to an {@link Type#STRING} value.
* Not supplying a schema may limit the ability to convert to the desired type.
*
* @param schema the schema for the value; may be null
* @param value the value to be converted; may be null
* @return the representation as a string, or null if the supplied value was null
*/
public static String convertToString(Schema schema, Object value) {
return (String) convertTo(Schema.OPTIONAL_STRING_SCHEMA, schema, value);
}
/**
* Convert the specified value to an {@link Type#ARRAY} value. If the value is a string representation of an array, this method
* will parse the string and its elements to infer the schemas for those elements. Thus, this method supports
* arrays of other primitives and structured types. If the value is already an array (or list), this method simply casts and
* returns it.
*
* <p>This method currently does not use the schema, though it may be used in the future.</p>
*
* @param schema the schema for the value; may be null
* @param value the value to be converted; may be null
* @return the representation as a list, or null if the supplied value was null
* @throws DataException if the value cannot be converted to a list value
*/
public static List<?> convertToList(Schema schema, Object value) {
return (List<?>) convertTo(ARRAY_SELECTOR_SCHEMA, schema, value);
}
/**
* Convert the specified value to an {@link Type#MAP} value. If the value is a string representation of a map, this method
* will parse the string and its entries to infer the schemas for those entries. Thus, this method supports
* maps with primitives and structured keys and values. If the value is already a map, this method simply casts and returns it.
*
* <p>This method currently does not use the schema, though it may be used in the future.</p>
*
* @param schema the schema for the value; may be null
* @param value the value to be converted; may be null
* @return the representation as a map, or null if the supplied value was null
* @throws DataException if the value cannot be converted to a map value
*/
public static Map<?, ?> convertToMap(Schema schema, Object value) {
return (Map<?, ?>) convertTo(MAP_SELECTOR_SCHEMA, schema, value);
}
/**
* Convert the specified value to an {@link Type#STRUCT} value. Structs cannot be converted from other types, so this method returns
* a struct only if the supplied value is a struct. If not a struct, this method throws an exception.
*
* <p>This method currently does not use the schema, though it may be used in the future.</p>
*
* @param schema the schema for the value; may be null
* @param value the value to be converted; may be null
* @return the representation as a struct, or null if the supplied value was null
* @throws DataException if the value is not a struct
*/
public static Struct convertToStruct(Schema schema, Object value) {
return (Struct) convertTo(STRUCT_SELECTOR_SCHEMA, schema, value);
}
/**
* Convert the specified value to an {@link Time#SCHEMA time} value.
* Not supplying a schema may limit the ability to convert to the desired type.
*
* @param schema the schema for the value; may be null
* @param value the value to be converted; may be null
* @return the representation as a time, or null if the supplied value was null
* @throws DataException if the value cannot be converted to a time value
*/
public static java.util.Date convertToTime(Schema schema, Object value) {
return (java.util.Date) convertTo(Time.SCHEMA, schema, value);
}
/**
* Convert the specified value to an {@link Date#SCHEMA date} value.
* Not supplying a schema may limit the ability to convert to the desired type.
*
* @param schema the schema for the value; may be null
* @param value the value to be converted; may be null
* @return the representation as a date, or null if the supplied value was null
* @throws DataException if the value cannot be converted to a date value
*/
public static java.util.Date convertToDate(Schema schema, Object value) {
return (java.util.Date) convertTo(Date.SCHEMA, schema, value);
}
/**
* Convert the specified value to an {@link Timestamp#SCHEMA timestamp} value.
* Not supplying a schema may limit the ability to convert to the desired type.
*
* @param schema the schema for the value; may be null
* @param value the value to be converted; may be null
* @return the representation as a timestamp, or null if the supplied value was null
* @throws DataException if the value cannot be converted to a timestamp value
*/
public static java.util.Date convertToTimestamp(Schema schema, Object value) {
return (java.util.Date) convertTo(Timestamp.SCHEMA, schema, value);
}
/**
* Convert the specified value to an {@link Decimal decimal} value.
* Not supplying a schema may limit the ability to convert to the desired type.
*
* @param schema the schema for the value; may be null
* @param value the value to be converted; may be null
* @return the representation as a decimal, or null if the supplied value was null
* @throws DataException if the value cannot be converted to a decimal value
*/
public static BigDecimal convertToDecimal(Schema schema, Object value, int scale) {
return (BigDecimal) convertTo(Decimal.schema(scale), schema, value);
}
/**
* If possible infer a schema for the given value.
*
* @param value the value whose schema is to be inferred; may be null
* @return the inferred schema, or null if the value is null or no schema could be inferred
*/
public static Schema inferSchema(Object value) {
if (value instanceof String) {
return Schema.STRING_SCHEMA;
}
if (value instanceof Boolean) {
return Schema.BOOLEAN_SCHEMA;
}
if (value instanceof Byte) {
return Schema.INT8_SCHEMA;
}
if (value instanceof Short) {
return Schema.INT16_SCHEMA;
}
if (value instanceof Integer) {
return Schema.INT32_SCHEMA;
}
if (value instanceof Long) {
return Schema.INT64_SCHEMA;
}
if (value instanceof Float) {
return Schema.FLOAT32_SCHEMA;
}
if (value instanceof Double) {
return Schema.FLOAT64_SCHEMA;
}
if (value instanceof byte[] || value instanceof ByteBuffer) {
return Schema.BYTES_SCHEMA;
}
if (value instanceof List) {
List<?> list = (List<?>) value;
if (list.isEmpty()) {
return null;
}
SchemaDetector detector = new SchemaDetector();
for (Object element : list) {
if (!detector.canDetect(element)) {
return null;
}
}
return SchemaBuilder.array(detector.schema()).build();
}
if (value instanceof Map) {
Map<?, ?> map = (Map<?, ?>) value;
if (map.isEmpty()) {
return null;
}
SchemaDetector keyDetector = new SchemaDetector();
SchemaDetector valueDetector = new SchemaDetector();
for (Map.Entry<?, ?> entry : map.entrySet()) {
if (!keyDetector.canDetect(entry.getKey()) || !valueDetector.canDetect(entry.getValue())) {
return null;
}
}
return SchemaBuilder.map(keyDetector.schema(), valueDetector.schema()).build();
}
if (value instanceof Struct) {
return ((Struct) value).schema();
}
return null;
}
/**
* Parse the specified string representation of a value into its schema and value.
*
* @param value the string form of the value
* @return the schema and value; never null, but whose schema and value may be null
* @see #convertToString
*/
public static SchemaAndValue parseString(String value) {
if (value == null) {
return NULL_SCHEMA_AND_VALUE;
}
if (value.isEmpty()) {
return new SchemaAndValue(Schema.STRING_SCHEMA, value);
}
Parser parser = new Parser(value);
return parse(parser, false);
}
/**
* Convert the value to the desired type.
*
* @param toSchema the schema for the desired type; may not be null
* @param fromSchema the schema for the supplied value; may be null if not known
* @return the converted value; never null
* @throws DataException if the value could not be converted to the desired type
*/
protected static Object convertTo(Schema toSchema, Schema fromSchema, Object value) throws DataException {
if (value == null) {
if (toSchema.isOptional()) {
return null;
}
throw new DataException("Unable to convert a null value to a schema that requires a value");
}
switch (toSchema.type()) {
case BYTES:
if (Decimal.LOGICAL_NAME.equals(toSchema.name())) {
if (value instanceof ByteBuffer) {
value = Utils.toArray((ByteBuffer) value);
}
if (value instanceof byte[]) {
return Decimal.toLogical(toSchema, (byte[]) value);
}
if (value instanceof BigDecimal) {
return value;
}
if (value instanceof Number) {
// Not already a decimal, so treat it as a double ...
double converted = ((Number) value).doubleValue();
return BigDecimal.valueOf(converted);
}
if (value instanceof String) {
return new BigDecimal(value.toString()).doubleValue();
}
}
if (value instanceof ByteBuffer) {
return Utils.toArray((ByteBuffer) value);
}
if (value instanceof byte[]) {
return value;
}
if (value instanceof BigDecimal) {
return Decimal.fromLogical(toSchema, (BigDecimal) value);
}
break;
case STRING:
StringBuilder sb = new StringBuilder();
append(sb, value, false);
return sb.toString();
case BOOLEAN:
if (value instanceof Boolean) {
return value;
}
if (value instanceof String) {
SchemaAndValue parsed = parseString(value.toString());
if (parsed.value() instanceof Boolean) {
return parsed.value();
}
}
return asLong(value, fromSchema, null) == 0L ? Boolean.FALSE : Boolean.TRUE;
case INT8:
if (value instanceof Byte) {
return value;
}
return (byte) asLong(value, fromSchema, null);
case INT16:
if (value instanceof Short) {
return value;
}
return (short) asLong(value, fromSchema, null);
case INT32:
if (Date.LOGICAL_NAME.equals(toSchema.name())) {
if (value instanceof String) {
SchemaAndValue parsed = parseString(value.toString());
value = parsed.value();
}
if (value instanceof java.util.Date) {
if (fromSchema != null) {
String fromSchemaName = fromSchema.name();
if (Date.LOGICAL_NAME.equals(fromSchemaName)) {
return value;
}
if (Timestamp.LOGICAL_NAME.equals(fromSchemaName)) {
// Just get the number of days from this timestamp
long millis = ((java.util.Date) value).getTime();
int days = (int) (millis / MILLIS_PER_DAY); // truncates
return Date.toLogical(toSchema, days);
}
} else {
// There is no fromSchema, so no conversion is needed
return value;
}
}
long numeric = asLong(value, fromSchema, null);
return Date.toLogical(toSchema, (int) numeric);
}
if (Time.LOGICAL_NAME.equals(toSchema.name())) {
if (value instanceof String) {
SchemaAndValue parsed = parseString(value.toString());
value = parsed.value();
}
if (value instanceof java.util.Date) {
if (fromSchema != null) {
String fromSchemaName = fromSchema.name();
if (Time.LOGICAL_NAME.equals(fromSchemaName)) {
return value;
}
if (Timestamp.LOGICAL_NAME.equals(fromSchemaName)) {
// Just get the time portion of this timestamp
Calendar calendar = Calendar.getInstance(UTC);
calendar.setTime((java.util.Date) value);
calendar.set(Calendar.YEAR, 1970);
calendar.set(Calendar.MONTH, 0); // Months are zero-based
calendar.set(Calendar.DAY_OF_MONTH, 1);
return Time.toLogical(toSchema, (int) calendar.getTimeInMillis());
}
} else {
// There is no fromSchema, so no conversion is needed
return value;
}
}
long numeric = asLong(value, fromSchema, null);
return Time.toLogical(toSchema, (int) numeric);
}
if (value instanceof Integer) {
return value;
}
return (int) asLong(value, fromSchema, null);
case INT64:
if (Timestamp.LOGICAL_NAME.equals(toSchema.name())) {
if (value instanceof String) {
SchemaAndValue parsed = parseString(value.toString());
value = parsed.value();
}
if (value instanceof java.util.Date) {
java.util.Date date = (java.util.Date) value;
if (fromSchema != null) {
String fromSchemaName = fromSchema.name();
if (Date.LOGICAL_NAME.equals(fromSchemaName)) {
int days = Date.fromLogical(fromSchema, date);
long millis = days * MILLIS_PER_DAY;
return Timestamp.toLogical(toSchema, millis);
}
if (Time.LOGICAL_NAME.equals(fromSchemaName)) {
long millis = Time.fromLogical(fromSchema, date);
return Timestamp.toLogical(toSchema, millis);
}
if (Timestamp.LOGICAL_NAME.equals(fromSchemaName)) {
return value;
}
} else {
// There is no fromSchema, so no conversion is needed
return value;
}
}
long numeric = asLong(value, fromSchema, null);
return Timestamp.toLogical(toSchema, numeric);
}
if (value instanceof Long) {
return value;
}
return asLong(value, fromSchema, null);
case FLOAT32:
if (value instanceof Float) {
return value;
}
return (float) asDouble(value, fromSchema, null);
case FLOAT64:
if (value instanceof Double) {
return value;
}
return asDouble(value, fromSchema, null);
case ARRAY:
if (value instanceof String) {
SchemaAndValue schemaAndValue = parseString(value.toString());
value = schemaAndValue.value();
}
if (value instanceof List) {
return value;
}
break;
case MAP:
if (value instanceof String) {
SchemaAndValue schemaAndValue = parseString(value.toString());
value = schemaAndValue.value();
}
if (value instanceof Map) {
return value;
}
break;
case STRUCT:
if (value instanceof Struct) {
return value;
}
}
throw new DataException("Unable to convert " + value + " (" + value.getClass() + ") to " + toSchema);
}
/**
* Convert the specified value to the desired scalar value type.
*
* @param value the value to be converted; may not be null
* @param fromSchema the schema for the current value type; may not be null
* @param error any previous error that should be included in an exception message; may be null
* @return the long value after conversion; never null
* @throws DataException if the value could not be converted to a long
*/
protected static long asLong(Object value, Schema fromSchema, Throwable error) {
try {
if (value instanceof Number) {
Number number = (Number) value;
return number.longValue();
}
if (value instanceof String) {
return new BigDecimal(value.toString()).longValue();
}
} catch (NumberFormatException e) {
error = e;
// fall through
}
if (fromSchema != null) {
String schemaName = fromSchema.name();
if (value instanceof java.util.Date) {
if (Date.LOGICAL_NAME.equals(schemaName)) {
return Date.fromLogical(fromSchema, (java.util.Date) value);
}
if (Time.LOGICAL_NAME.equals(schemaName)) {
return Time.fromLogical(fromSchema, (java.util.Date) value);
}
if (Timestamp.LOGICAL_NAME.equals(schemaName)) {
return Timestamp.fromLogical(fromSchema, (java.util.Date) value);
}
}
throw new DataException("Unable to convert " + value + " (" + value.getClass() + ") to " + fromSchema, error);
}
throw new DataException("Unable to convert " + value + " (" + value.getClass() + ") to a number", error);
}
/**
* Convert the specified value with the desired floating point type.
*
* @param value the value to be converted; may not be null
* @param schema the schema for the current value type; may not be null
* @param error any previous error that should be included in an exception message; may be null
* @return the double value after conversion; never null
* @throws DataException if the value could not be converted to a double
*/
protected static double asDouble(Object value, Schema schema, Throwable error) {
try {
if (value instanceof Number) {
Number number = (Number) value;
return number.doubleValue();
}
if (value instanceof String) {
return new BigDecimal(value.toString()).doubleValue();
}
} catch (NumberFormatException e) {
error = e;
// fall through
}
return asLong(value, schema, error);
}
protected static void append(StringBuilder sb, Object value, boolean embedded) {
if (value == null) {
sb.append(NULL_VALUE);
} else if (value instanceof Number) {
sb.append(value);
} else if (value instanceof Boolean) {
sb.append(value);
} else if (value instanceof String) {
if (embedded) {
String escaped = escape((String) value);
sb.append('"').append(escaped).append('"');
} else {
sb.append(value);
}
} else if (value instanceof byte[]) {
value = Base64.getEncoder().encodeToString((byte[]) value);
if (embedded) {
sb.append('"').append(value).append('"');
} else {
sb.append(value);
}
} else if (value instanceof ByteBuffer) {
byte[] bytes = Utils.readBytes((ByteBuffer) value);
append(sb, bytes, embedded);
} else if (value instanceof List) {
List<?> list = (List<?>) value;
sb.append('[');
appendIterable(sb, list.iterator());
sb.append(']');
} else if (value instanceof Map) {
Map<?, ?> map = (Map<?, ?>) value;
sb.append('{');
appendIterable(sb, map.entrySet().iterator());
sb.append('}');
} else if (value instanceof Struct) {
Struct struct = (Struct) value;
Schema schema = struct.schema();
boolean first = true;
sb.append('{');
for (Field field : schema.fields()) {
if (first) {
first = false;
} else {
sb.append(',');
}
append(sb, field.name(), true);
sb.append(':');
append(sb, struct.get(field), true);
}
sb.append('}');
} else if (value instanceof Map.Entry) {
Map.Entry<?, ?> entry = (Map.Entry<?, ?>) value;
append(sb, entry.getKey(), true);
sb.append(':');
append(sb, entry.getValue(), true);
} else if (value instanceof java.util.Date) {
java.util.Date dateValue = (java.util.Date) value;
String formatted = dateFormatFor(dateValue).format(dateValue);
sb.append(formatted);
} else {
throw new DataException("Failed to serialize unexpected value type " + value.getClass().getName() + ": " + value);
}
}
protected static void appendIterable(StringBuilder sb, Iterator<?> iter) {
if (iter.hasNext()) {
append(sb, iter.next(), true);
while (iter.hasNext()) {
sb.append(',');
append(sb, iter.next(), true);
}
}
}
protected static String escape(String value) {
String replace1 = TWO_BACKSLASHES.matcher(value).replaceAll("\\\\\\\\");
return DOUBLE_QUOTE.matcher(replace1).replaceAll("\\\\\"");
}
public static DateFormat dateFormatFor(java.util.Date value) {
if (value.getTime() < MILLIS_PER_DAY) {
return new SimpleDateFormat(ISO_8601_TIME_FORMAT_PATTERN);
}
if (value.getTime() % MILLIS_PER_DAY == 0) {
return new SimpleDateFormat(ISO_8601_DATE_FORMAT_PATTERN);
}
return new SimpleDateFormat(ISO_8601_TIMESTAMP_FORMAT_PATTERN);
}
protected static boolean canParseSingleTokenLiteral(Parser parser, boolean embedded, String tokenLiteral) {
int startPosition = parser.mark();
// If the next token is what we expect, then either...
if (parser.canConsume(tokenLiteral)) {
// ...we're reading an embedded value, in which case the next token will be handled appropriately
// by the caller if it's something like an end delimiter for a map or array, or a comma to
// separate multiple embedded values...
// ...or it's being parsed as part of a top-level string, in which case, any other tokens should
// cause use to stop parsing this single-token literal as such and instead just treat it like
// a string. For example, the top-level string "true}" will be tokenized as the tokens "true" and
// "}", but should ultimately be parsed as just the string "true}" instead of the boolean true.
if (embedded || !parser.hasNext()) {
return true;
}
}
parser.rewindTo(startPosition);
return false;
}
protected static SchemaAndValue parse(Parser parser, boolean embedded) throws NoSuchElementException {
if (!parser.hasNext()) {
return null;
}
if (embedded) {
if (parser.canConsume(QUOTE_DELIMITER)) {
StringBuilder sb = new StringBuilder();
while (parser.hasNext()) {
if (parser.canConsume(QUOTE_DELIMITER)) {
break;
}
sb.append(parser.next());
}
String content = sb.toString();
// We can parse string literals as temporal logical types, but all others
// are treated as strings
SchemaAndValue parsed = parseString(content);
if (parsed != null && TEMPORAL_LOGICAL_TYPE_NAMES.contains(parsed.schema().name())) {
return parsed;
}
return new SchemaAndValue(Schema.STRING_SCHEMA, content);
}
}
if (canParseSingleTokenLiteral(parser, embedded, NULL_VALUE)) {
return null;
}
if (canParseSingleTokenLiteral(parser, embedded, TRUE_LITERAL)) {
return TRUE_SCHEMA_AND_VALUE;
}
if (canParseSingleTokenLiteral(parser, embedded, FALSE_LITERAL)) {
return FALSE_SCHEMA_AND_VALUE;
}
int startPosition = parser.mark();
try {
if (parser.canConsume(ARRAY_BEGIN_DELIMITER)) {
List<Object> result = new ArrayList<>();
Schema elementSchema = null;
while (parser.hasNext()) {
if (parser.canConsume(ARRAY_END_DELIMITER)) {
Schema listSchema;
if (elementSchema != null) {
listSchema = SchemaBuilder.array(elementSchema).schema();
result = alignListEntriesWithSchema(listSchema, result);
} else {
// Every value is null
listSchema = SchemaBuilder.arrayOfNull().build();
}
return new SchemaAndValue(listSchema, result);
}
if (parser.canConsume(COMMA_DELIMITER)) {
throw new DataException("Unable to parse an empty array element: " + parser.original());
}
SchemaAndValue element = parse(parser, true);
elementSchema = commonSchemaFor(elementSchema, element);
result.add(element != null ? element.value() : null);
int currentPosition = parser.mark();
if (parser.canConsume(ARRAY_END_DELIMITER)) {
parser.rewindTo(currentPosition);
} else if (!parser.canConsume(COMMA_DELIMITER)) {
throw new DataException("Array elements missing '" + COMMA_DELIMITER + "' delimiter");
}
}
// Missing either a comma or an end delimiter
if (COMMA_DELIMITER.equals(parser.previous())) {
throw new DataException("Array is missing element after ',': " + parser.original());
}
throw new DataException("Array is missing terminating ']': " + parser.original());
}
if (parser.canConsume(MAP_BEGIN_DELIMITER)) {
Map<Object, Object> result = new LinkedHashMap<>();
Schema keySchema = null;
Schema valueSchema = null;
while (parser.hasNext()) {
if (parser.canConsume(MAP_END_DELIMITER)) {
Schema mapSchema;
if (keySchema != null && valueSchema != null) {
mapSchema = SchemaBuilder.map(keySchema, valueSchema).build();
result = alignMapKeysAndValuesWithSchema(mapSchema, result);
} else if (keySchema != null) {
mapSchema = SchemaBuilder.mapWithNullValues(keySchema);
result = alignMapKeysWithSchema(mapSchema, result);
} else {
mapSchema = SchemaBuilder.mapOfNull().build();
}
return new SchemaAndValue(mapSchema, result);
}
if (parser.canConsume(COMMA_DELIMITER)) {
throw new DataException("Unable to parse a map entry with no key or value: " + parser.original());
}
SchemaAndValue key = parse(parser, true);
if (key == null || key.value() == null) {
throw new DataException("Map entry may not have a null key: " + parser.original());
}
if (!parser.canConsume(ENTRY_DELIMITER)) {
throw new DataException("Map entry is missing '" + ENTRY_DELIMITER
+ "' at " + parser.position()
+ " in " + parser.original());
}
SchemaAndValue value = parse(parser, true);
Object entryValue = value != null ? value.value() : null;
result.put(key.value(), entryValue);
parser.canConsume(COMMA_DELIMITER);
keySchema = commonSchemaFor(keySchema, key);
valueSchema = commonSchemaFor(valueSchema, value);
}
// Missing either a comma or an end delimiter
if (COMMA_DELIMITER.equals(parser.previous())) {
throw new DataException("Map is missing element after ',': " + parser.original());
}
throw new DataException("Map is missing terminating '}': " + parser.original());
}
} catch (DataException e) {
LOG.trace("Unable to parse the value as a map or an array; reverting to string", e);
parser.rewindTo(startPosition);
}
String token = parser.next();
if (Utils.isBlank(token)) {
return new SchemaAndValue(Schema.STRING_SCHEMA, token);
}
token = token.trim();
char firstChar = token.charAt(0);
boolean firstCharIsDigit = Character.isDigit(firstChar);
// Temporal types are more restrictive, so try them first
if (firstCharIsDigit) {
// The time and timestamp literals may be split into 5 tokens since an unescaped colon
// is a delimiter. Check these first since the first of these tokens is a simple numeric
int position = parser.mark();
String remainder = parser.next(4);
if (remainder != null) {
String timeOrTimestampStr = token + remainder;
SchemaAndValue temporal = parseAsTemporal(timeOrTimestampStr);
if (temporal != null) {
return temporal;
}
}
// No match was found using the 5 tokens, so rewind and see if the current token has a date, time, or timestamp
parser.rewindTo(position);
SchemaAndValue temporal = parseAsTemporal(token);
if (temporal != null) {
return temporal;
}
}
if (firstCharIsDigit || firstChar == '+' || firstChar == '-') {
try {
// Try to parse as a number ...
BigDecimal decimal = new BigDecimal(token);
try {
return new SchemaAndValue(Schema.INT8_SCHEMA, decimal.byteValueExact());
} catch (ArithmeticException e) {
// continue
}
try {
return new SchemaAndValue(Schema.INT16_SCHEMA, decimal.shortValueExact());
} catch (ArithmeticException e) {
// continue
}
try {
return new SchemaAndValue(Schema.INT32_SCHEMA, decimal.intValueExact());
} catch (ArithmeticException e) {
// continue
}
try {
return new SchemaAndValue(Schema.INT64_SCHEMA, decimal.longValueExact());
} catch (ArithmeticException e) {
// continue
}
float fValue = decimal.floatValue();
if (fValue != Float.NEGATIVE_INFINITY && fValue != Float.POSITIVE_INFINITY
&& decimal.scale() != 0) {
return new SchemaAndValue(Schema.FLOAT32_SCHEMA, fValue);
}
double dValue = decimal.doubleValue();
if (dValue != Double.NEGATIVE_INFINITY && dValue != Double.POSITIVE_INFINITY
&& decimal.scale() != 0) {
return new SchemaAndValue(Schema.FLOAT64_SCHEMA, dValue);
}
Schema schema = Decimal.schema(decimal.scale());
return new SchemaAndValue(schema, decimal);
} catch (NumberFormatException e) {
// can't parse as a number
}
}
if (embedded) {
throw new DataException("Failed to parse embedded value");
}
// At this point, the only thing this non-embedded value can be is a string.
return new SchemaAndValue(Schema.STRING_SCHEMA, parser.original());
}
private static SchemaAndValue parseAsTemporal(String token) {
if (token == null) {
return null;
}
// If the colons were escaped, we'll see the escape chars and need to remove them
token = token.replace("\\:", ":");
int tokenLength = token.length();
if (tokenLength == ISO_8601_TIME_LENGTH) {
try {
return new SchemaAndValue(Time.SCHEMA, new SimpleDateFormat(ISO_8601_TIME_FORMAT_PATTERN).parse(token));
} catch (ParseException e) {
// not a valid date
}
} else if (tokenLength == ISO_8601_TIMESTAMP_LENGTH) {
try {
return new SchemaAndValue(Timestamp.SCHEMA, new SimpleDateFormat(ISO_8601_TIMESTAMP_FORMAT_PATTERN).parse(token));
} catch (ParseException e) {
// not a valid date
}
} else if (tokenLength == ISO_8601_DATE_LENGTH) {
try {
return new SchemaAndValue(Date.SCHEMA, new SimpleDateFormat(ISO_8601_DATE_FORMAT_PATTERN).parse(token));
} catch (ParseException e) {
// not a valid date
}
}
return null;
}
protected static Schema commonSchemaFor(Schema previous, SchemaAndValue latest) {
if (latest == null) {
return previous;
}
if (previous == null) {
return latest.schema();
}
Schema newSchema = latest.schema();
Type previousType = previous.type();
Type newType = newSchema.type();
if (previousType != newType) {
switch (previous.type()) {
case INT8:
if (newType == Type.INT16 || newType == Type.INT32 || newType == Type.INT64 || newType == Type.FLOAT32 || newType ==
Type.FLOAT64) {
return newSchema;
}
break;
case INT16:
if (newType == Type.INT8) {
return previous;
}
if (newType == Type.INT32 || newType == Type.INT64 || newType == Type.FLOAT32 || newType == Type.FLOAT64) {
return newSchema;
}
break;
case INT32:
if (newType == Type.INT8 || newType == Type.INT16) {
return previous;
}
if (newType == Type.INT64 || newType == Type.FLOAT32 || newType == Type.FLOAT64) {
return newSchema;
}
break;
case INT64:
if (newType == Type.INT8 || newType == Type.INT16 || newType == Type.INT32) {
return previous;
}
if (newType == Type.FLOAT32 || newType == Type.FLOAT64) {
return newSchema;
}
break;
case FLOAT32:
if (newType == Type.INT8 || newType == Type.INT16 || newType == Type.INT32 || newType == Type.INT64) {
return previous;
}
if (newType == Type.FLOAT64) {
return newSchema;
}
break;
case FLOAT64:
if (newType == Type.INT8 || newType == Type.INT16 || newType == Type.INT32 || newType == Type.INT64 || newType ==
Type.FLOAT32) {
return previous;
}
break;
}
return null;
}
if (previous.isOptional() == newSchema.isOptional()) {
// Use the optional one
return previous.isOptional() ? previous : newSchema;
}
if (!previous.equals(newSchema)) {
return null;
}
return previous;
}
protected static List<Object> alignListEntriesWithSchema(Schema schema, List<Object> input) {
Schema valueSchema = schema.valueSchema();
List<Object> result = new ArrayList<>();
for (Object value : input) {
Object newValue = convertTo(valueSchema, null, value);
result.add(newValue);
}
return result;
}
protected static Map<Object, Object> alignMapKeysAndValuesWithSchema(Schema mapSchema, Map<Object, Object> input) {
Schema keySchema = mapSchema.keySchema();
Schema valueSchema = mapSchema.valueSchema();
Map<Object, Object> result = new LinkedHashMap<>();
for (Map.Entry<?, ?> entry : input.entrySet()) {
Object newKey = convertTo(keySchema, null, entry.getKey());
Object newValue = convertTo(valueSchema, null, entry.getValue());
result.put(newKey, newValue);
}
return result;
}
protected static Map<Object, Object> alignMapKeysWithSchema(Schema mapSchema, Map<Object, Object> input) {
Schema keySchema = mapSchema.keySchema();
Map<Object, Object> result = new LinkedHashMap<>();
for (Map.Entry<?, ?> entry : input.entrySet()) {
Object newKey = convertTo(keySchema, null, entry.getKey());
result.put(newKey, entry.getValue());
}
return result;
}
protected static class SchemaDetector {
private Type knownType = null;
private boolean optional = false;
public SchemaDetector() {
}
public boolean canDetect(Object value) {
if (value == null) {
optional = true;
return true;
}
Schema schema = inferSchema(value);
if (schema == null) {
return false;
}
if (knownType == null) {
knownType = schema.type();
} else if (knownType != schema.type()) {
return false;
}
return true;
}
public Schema schema() {
SchemaBuilder builder = SchemaBuilder.type(knownType);
if (optional) {
builder.optional();
}
return builder.schema();
}
}
protected static class Parser {
private final String original;
private final CharacterIterator iter;
private String nextToken = null;
private String previousToken = null;
public Parser(String original) {
this.original = original;
this.iter = new StringCharacterIterator(this.original);
}
public int position() {
return iter.getIndex();
}
public int mark() {
return iter.getIndex() - (nextToken != null ? nextToken.length() : 0);
}
public void rewindTo(int position) {
iter.setIndex(position);
nextToken = null;
previousToken = null;
}
public String original() {
return original;
}
public boolean hasNext() {
return nextToken != null || canConsumeNextToken();
}
protected boolean canConsumeNextToken() {
return iter.getEndIndex() > iter.getIndex();
}
public String next() {
if (nextToken != null) {
previousToken = nextToken;
nextToken = null;
} else {
previousToken = consumeNextToken();
}
return previousToken;
}
public String next(int n) {
int current = mark();
int start = mark();
for (int i = 0; i != n; ++i) {
if (!hasNext()) {
rewindTo(start);
return null;
}
next();
}
return original.substring(current, position());
}
private String consumeNextToken() throws NoSuchElementException {
boolean escaped = false;
int start = iter.getIndex();
char c = iter.current();
while (canConsumeNextToken()) {
switch (c) {
case '\\':
escaped = !escaped;
break;
case ':':
case ',':
case '{':
case '}':
case '[':
case ']':
case '\"':
if (!escaped) {
if (start < iter.getIndex()) {
// Return the previous token
return original.substring(start, iter.getIndex());
}
// Consume and return this delimiter as a token
iter.next();
return original.substring(start, start + 1);
}
// escaped, so continue
escaped = false;
break;
default:
// If escaped, then we don't care what was escaped
escaped = false;
break;
}
c = iter.next();
}
return original.substring(start, iter.getIndex());
}
public String previous() {
return previousToken;
}
public boolean canConsume(String expected) {
return canConsume(expected, true);
}
public boolean canConsume(String expected, boolean ignoreLeadingAndTrailingWhitespace) {
if (isNext(expected, ignoreLeadingAndTrailingWhitespace)) {
// consume this token ...
nextToken = null;
return true;
}
return false;
}
protected boolean isNext(String expected, boolean ignoreLeadingAndTrailingWhitespace) {
if (nextToken == null) {
if (!hasNext()) {
return false;
}
// There's another token, so consume it
nextToken = consumeNextToken();
}
if (ignoreLeadingAndTrailingWhitespace) {
while (Utils.isBlank(nextToken) && canConsumeNextToken()) {
nextToken = consumeNextToken();
}
}
return ignoreLeadingAndTrailingWhitespace
? nextToken.trim().equals(expected)
: nextToken.equals(expected);
}
}
}
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