spring ConfigDataEnvironmentContributor 源码
springboot ConfigDataEnvironmentContributor 代码
文件路径：/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/config/ConfigDataEnvironmentContributor.java
/*
* Copyright 2012-2022 the original author or authors.
*
* Licensed 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
*
* https://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.springframework.boot.context.config;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;
import org.springframework.boot.context.properties.bind.Binder;
import org.springframework.boot.context.properties.bind.PlaceholdersResolver;
import org.springframework.boot.context.properties.source.ConfigurationPropertySource;
import org.springframework.core.env.Environment;
import org.springframework.core.env.PropertySource;
import org.springframework.util.CollectionUtils;
/**
* A single element that may directly or indirectly contribute configuration data to the
* {@link Environment}. There are several {@link Kind kinds} of contributor, all are
* immutable and will be replaced with new versions as imports are processed.
* <p>
* Contributors may provide a set of imports that should be processed and ultimately
* turned into children. There are two distinct import phases:
* <ul>
* <li>{@link ImportPhase#BEFORE_PROFILE_ACTIVATION Before} profiles have been
* activated.</li>
* <li>{@link ImportPhase#AFTER_PROFILE_ACTIVATION After} profiles have been
* activated.</li>
* </ul>
* In each phase <em>all</em> imports will be resolved before they are loaded.
*
* @author Phillip Webb
* @author Madhura Bhave
*/
class ConfigDataEnvironmentContributor implements Iterable<ConfigDataEnvironmentContributor> {
private static final ConfigData.Options EMPTY_LOCATION_OPTIONS = ConfigData.Options
.of(ConfigData.Option.IGNORE_IMPORTS);
private final ConfigDataLocation location;
private final ConfigDataResource resource;
private final boolean fromProfileSpecificImport;
private final PropertySource<?> propertySource;
private final ConfigurationPropertySource configurationPropertySource;
private final ConfigDataProperties properties;
private final ConfigData.Options configDataOptions;
private final Map<ImportPhase, List<ConfigDataEnvironmentContributor>> children;
private final Kind kind;
/**
* Create a new {@link ConfigDataEnvironmentContributor} instance.
* @param kind the contributor kind
* @param location the location of this contributor
* @param resource the resource that contributed the data or {@code null}
* @param fromProfileSpecificImport if the contributor is from a profile specific
* import
* @param propertySource the property source for the data or {@code null}
* @param configurationPropertySource the configuration property source for the data
* or {@code null}
* @param properties the config data properties or {@code null}
* @param configDataOptions any config data options that should apply
* @param children the children of this contributor at each {@link ImportPhase}
*/
ConfigDataEnvironmentContributor(Kind kind, ConfigDataLocation location, ConfigDataResource resource,
boolean fromProfileSpecificImport, PropertySource<?> propertySource,
ConfigurationPropertySource configurationPropertySource, ConfigDataProperties properties,
ConfigData.Options configDataOptions, Map<ImportPhase, List<ConfigDataEnvironmentContributor>> children) {
this.kind = kind;
this.location = location;
this.resource = resource;
this.fromProfileSpecificImport = fromProfileSpecificImport;
this.properties = properties;
this.propertySource = propertySource;
this.configurationPropertySource = configurationPropertySource;
this.configDataOptions = (configDataOptions != null) ? configDataOptions : ConfigData.Options.NONE;
this.children = (children != null) ? children : Collections.emptyMap();
}
/**
* Return the contributor kind.
* @return the kind of contributor
*/
Kind getKind() {
return this.kind;
}
ConfigDataLocation getLocation() {
return this.location;
}
/**
* Return if this contributor is currently active.
* @param activationContext the activation context
* @return if the contributor is active
*/
boolean isActive(ConfigDataActivationContext activationContext) {
if (this.kind == Kind.UNBOUND_IMPORT) {
return false;
}
return this.properties == null || this.properties.isActive(activationContext);
}
/**
* Return the resource that contributed this instance.
* @return the resource or {@code null}
*/
ConfigDataResource getResource() {
return this.resource;
}
/**
* Return if the contributor is from a profile specific import.
* @return if the contributor is profile specific
*/
boolean isFromProfileSpecificImport() {
return this.fromProfileSpecificImport;
}
/**
* Return the property source for this contributor.
* @return the property source or {@code null}
*/
PropertySource<?> getPropertySource() {
return this.propertySource;
}
/**
* Return the configuration property source for this contributor.
* @return the configuration property source or {@code null}
*/
ConfigurationPropertySource getConfigurationPropertySource() {
return this.configurationPropertySource;
}
/**
* Return if the contributor has a specific config data option.
* @param option the option to check
* @return {@code true} if the option is present
*/
boolean hasConfigDataOption(ConfigData.Option option) {
return this.configDataOptions.contains(option);
}
ConfigDataEnvironmentContributor withoutConfigDataOption(ConfigData.Option option) {
return new ConfigDataEnvironmentContributor(this.kind, this.location, this.resource,
this.fromProfileSpecificImport, this.propertySource, this.configurationPropertySource, this.properties,
this.configDataOptions.without(option), this.children);
}
/**
* Return any imports requested by this contributor.
* @return the imports
*/
List<ConfigDataLocation> getImports() {
return (this.properties != null) ? this.properties.getImports() : Collections.emptyList();
}
/**
* Return true if this contributor has imports that have not yet been processed in the
* given phase.
* @param importPhase the import phase
* @return if there are unprocessed imports
*/
boolean hasUnprocessedImports(ImportPhase importPhase) {
if (getImports().isEmpty()) {
return false;
}
return !this.children.containsKey(importPhase);
}
/**
* Return children of this contributor for the given phase.
* @param importPhase the import phase
* @return a list of children
*/
List<ConfigDataEnvironmentContributor> getChildren(ImportPhase importPhase) {
return this.children.getOrDefault(importPhase, Collections.emptyList());
}
/**
* Returns a {@link Stream} that traverses this contributor and all its children in
* priority order.
* @return the stream
*/
Stream<ConfigDataEnvironmentContributor> stream() {
return StreamSupport.stream(spliterator(), false);
}
/**
* Returns an {@link Iterator} that traverses this contributor and all its children in
* priority order.
* @return the iterator
* @see java.lang.Iterable#iterator()
*/
@Override
public Iterator<ConfigDataEnvironmentContributor> iterator() {
return new ContributorIterator();
}
/**
* Create a new {@link ConfigDataEnvironmentContributor} with bound
* {@link ConfigDataProperties}.
* @param contributors the contributors used for binding
* @param activationContext the activation context
* @return a new contributor instance
*/
ConfigDataEnvironmentContributor withBoundProperties(Iterable<ConfigDataEnvironmentContributor> contributors,
ConfigDataActivationContext activationContext) {
Iterable<ConfigurationPropertySource> sources = Collections.singleton(getConfigurationPropertySource());
PlaceholdersResolver placeholdersResolver = new ConfigDataEnvironmentContributorPlaceholdersResolver(
contributors, activationContext, this, true);
Binder binder = new Binder(sources, placeholdersResolver, null, null, null);
ConfigDataProperties properties = ConfigDataProperties.get(binder);
if (properties != null && this.configDataOptions.contains(ConfigData.Option.IGNORE_IMPORTS)) {
properties = properties.withoutImports();
}
return new ConfigDataEnvironmentContributor(Kind.BOUND_IMPORT, this.location, this.resource,
this.fromProfileSpecificImport, this.propertySource, this.configurationPropertySource, properties,
this.configDataOptions, null);
}
/**
* Create a new {@link ConfigDataEnvironmentContributor} instance with a new set of
* children for the given phase.
* @param importPhase the import phase
* @param children the new children
* @return a new contributor instance
*/
ConfigDataEnvironmentContributor withChildren(ImportPhase importPhase,
List<ConfigDataEnvironmentContributor> children) {
Map<ImportPhase, List<ConfigDataEnvironmentContributor>> updatedChildren = new LinkedHashMap<>(this.children);
updatedChildren.put(importPhase, children);
if (importPhase == ImportPhase.AFTER_PROFILE_ACTIVATION) {
moveProfileSpecific(updatedChildren);
}
return new ConfigDataEnvironmentContributor(this.kind, this.location, this.resource,
this.fromProfileSpecificImport, this.propertySource, this.configurationPropertySource, this.properties,
this.configDataOptions, updatedChildren);
}
private void moveProfileSpecific(Map<ImportPhase, List<ConfigDataEnvironmentContributor>> children) {
List<ConfigDataEnvironmentContributor> before = children.get(ImportPhase.BEFORE_PROFILE_ACTIVATION);
if (!hasAnyProfileSpecificChildren(before)) {
return;
}
List<ConfigDataEnvironmentContributor> updatedBefore = new ArrayList<>(before.size());
List<ConfigDataEnvironmentContributor> updatedAfter = new ArrayList<>();
for (ConfigDataEnvironmentContributor contributor : before) {
updatedBefore.add(moveProfileSpecificChildren(contributor, updatedAfter));
}
updatedAfter.addAll(children.getOrDefault(ImportPhase.AFTER_PROFILE_ACTIVATION, Collections.emptyList()));
children.put(ImportPhase.BEFORE_PROFILE_ACTIVATION, updatedBefore);
children.put(ImportPhase.AFTER_PROFILE_ACTIVATION, updatedAfter);
}
private ConfigDataEnvironmentContributor moveProfileSpecificChildren(ConfigDataEnvironmentContributor contributor,
List<ConfigDataEnvironmentContributor> removed) {
for (ImportPhase importPhase : ImportPhase.values()) {
List<ConfigDataEnvironmentContributor> children = contributor.getChildren(importPhase);
List<ConfigDataEnvironmentContributor> updatedChildren = new ArrayList<>(children.size());
for (ConfigDataEnvironmentContributor child : children) {
if (child.hasConfigDataOption(ConfigData.Option.PROFILE_SPECIFIC)) {
removed.add(child.withoutConfigDataOption(ConfigData.Option.PROFILE_SPECIFIC));
}
else {
updatedChildren.add(child);
}
}
contributor = contributor.withChildren(importPhase, updatedChildren);
}
return contributor;
}
private boolean hasAnyProfileSpecificChildren(List<ConfigDataEnvironmentContributor> contributors) {
if (CollectionUtils.isEmpty(contributors)) {
return false;
}
for (ConfigDataEnvironmentContributor contributor : contributors) {
for (ImportPhase importPhase : ImportPhase.values()) {
if (contributor.getChildren(importPhase).stream()
.anyMatch((child) -> child.hasConfigDataOption(ConfigData.Option.PROFILE_SPECIFIC))) {
return true;
}
}
}
return false;
}
/**
* Create a new {@link ConfigDataEnvironmentContributor} instance where an existing
* child is replaced.
* @param existing the existing node that should be replaced
* @param replacement the replacement node that should be used instead
* @return a new {@link ConfigDataEnvironmentContributor} instance
*/
ConfigDataEnvironmentContributor withReplacement(ConfigDataEnvironmentContributor existing,
ConfigDataEnvironmentContributor replacement) {
if (this == existing) {
return replacement;
}
Map<ImportPhase, List<ConfigDataEnvironmentContributor>> updatedChildren = new LinkedHashMap<>(
this.children.size());
this.children.forEach((importPhase, contributors) -> {
List<ConfigDataEnvironmentContributor> updatedContributors = new ArrayList<>(contributors.size());
for (ConfigDataEnvironmentContributor contributor : contributors) {
updatedContributors.add(contributor.withReplacement(existing, replacement));
}
updatedChildren.put(importPhase, Collections.unmodifiableList(updatedContributors));
});
return new ConfigDataEnvironmentContributor(this.kind, this.location, this.resource,
this.fromProfileSpecificImport, this.propertySource, this.configurationPropertySource, this.properties,
this.configDataOptions, updatedChildren);
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
buildToString("", builder);
return builder.toString();
}
private void buildToString(String prefix, StringBuilder builder) {
builder.append(prefix);
builder.append(this.kind);
builder.append(" ");
builder.append(this.location);
builder.append(" ");
builder.append(this.resource);
builder.append(" ");
builder.append(this.configDataOptions);
builder.append("\n");
for (ConfigDataEnvironmentContributor child : this.children.getOrDefault(ImportPhase.BEFORE_PROFILE_ACTIVATION,
Collections.emptyList())) {
child.buildToString(prefix + " ", builder);
}
for (ConfigDataEnvironmentContributor child : this.children.getOrDefault(ImportPhase.AFTER_PROFILE_ACTIVATION,
Collections.emptyList())) {
child.buildToString(prefix + " ", builder);
}
}
/**
* Factory method to create a {@link Kind#ROOT root} contributor.
* @param contributors the immediate children of the root
* @return a new {@link ConfigDataEnvironmentContributor} instance
*/
static ConfigDataEnvironmentContributor of(List<ConfigDataEnvironmentContributor> contributors) {
Map<ImportPhase, List<ConfigDataEnvironmentContributor>> children = new LinkedHashMap<>();
children.put(ImportPhase.BEFORE_PROFILE_ACTIVATION, Collections.unmodifiableList(contributors));
return new ConfigDataEnvironmentContributor(Kind.ROOT, null, null, false, null, null, null, null, children);
}
/**
* Factory method to create a {@link Kind#INITIAL_IMPORT initial import} contributor.
* This contributor is used to trigger initial imports of additional contributors. It
* does not contribute any properties itself.
* @param initialImport the initial import location (with placeholders resolved)
* @return a new {@link ConfigDataEnvironmentContributor} instance
*/
static ConfigDataEnvironmentContributor ofInitialImport(ConfigDataLocation initialImport) {
List<ConfigDataLocation> imports = Collections.singletonList(initialImport);
ConfigDataProperties properties = new ConfigDataProperties(imports, null);
return new ConfigDataEnvironmentContributor(Kind.INITIAL_IMPORT, null, null, false, null, null, properties,
null, null);
}
/**
* Factory method to create a contributor that wraps an {@link Kind#EXISTING existing}
* property source. The contributor provides access to existing properties, but
* doesn't actively import any additional contributors.
* @param propertySource the property source to wrap
* @return a new {@link ConfigDataEnvironmentContributor} instance
*/
static ConfigDataEnvironmentContributor ofExisting(PropertySource<?> propertySource) {
return new ConfigDataEnvironmentContributor(Kind.EXISTING, null, null, false, propertySource,
ConfigurationPropertySource.from(propertySource), null, null, null);
}
/**
* Factory method to create an {@link Kind#UNBOUND_IMPORT unbound import} contributor.
* This contributor has been actively imported from another contributor and may itself
* import further contributors later.
* @param location the location of this contributor
* @param resource the config data resource
* @param profileSpecific if the contributor is from a profile specific import
* @param configData the config data
* @param propertySourceIndex the index of the property source that should be used
* @return a new {@link ConfigDataEnvironmentContributor} instance
*/
static ConfigDataEnvironmentContributor ofUnboundImport(ConfigDataLocation location, ConfigDataResource resource,
boolean profileSpecific, ConfigData configData, int propertySourceIndex) {
PropertySource<?> propertySource = configData.getPropertySources().get(propertySourceIndex);
ConfigData.Options options = configData.getOptions(propertySource);
ConfigurationPropertySource configurationPropertySource = ConfigurationPropertySource.from(propertySource);
return new ConfigDataEnvironmentContributor(Kind.UNBOUND_IMPORT, location, resource, profileSpecific,
propertySource, configurationPropertySource, null, options, null);
}
/**
* Factory method to create an {@link Kind#EMPTY_LOCATION empty location} contributor.
* @param location the location of this contributor
* @param profileSpecific if the contributor is from a profile specific import
* @return a new {@link ConfigDataEnvironmentContributor} instance
*/
static ConfigDataEnvironmentContributor ofEmptyLocation(ConfigDataLocation location, boolean profileSpecific) {
return new ConfigDataEnvironmentContributor(Kind.EMPTY_LOCATION, location, null, profileSpecific, null, null,
null, EMPTY_LOCATION_OPTIONS, null);
}
/**
* The various kinds of contributor.
*/
enum Kind {
/**
* A root contributor used contain the initial set of children.
*/
ROOT,
/**
* An initial import that needs to be processed.
*/
INITIAL_IMPORT,
/**
* An existing property source that contributes properties but no imports.
*/
EXISTING,
/**
* A contributor with {@link ConfigData} imported from another contributor but not
* yet bound.
*/
UNBOUND_IMPORT,
/**
* A contributor with {@link ConfigData} imported from another contributor that
* has been.
*/
BOUND_IMPORT,
/**
* A valid location that contained nothing to load.
*/
EMPTY_LOCATION;
}
/**
* Import phases that can be used when obtaining imports.
*/
enum ImportPhase {
/**
* The phase before profiles have been activated.
*/
BEFORE_PROFILE_ACTIVATION,
/**
* The phase after profiles have been activated.
*/
AFTER_PROFILE_ACTIVATION;
/**
* Return the {@link ImportPhase} based on the given activation context.
* @param activationContext the activation context
* @return the import phase
*/
static ImportPhase get(ConfigDataActivationContext activationContext) {
if (activationContext != null && activationContext.getProfiles() != null) {
return AFTER_PROFILE_ACTIVATION;
}
return BEFORE_PROFILE_ACTIVATION;
}
}
/**
* Iterator that traverses the contributor tree.
*/
private final class ContributorIterator implements Iterator<ConfigDataEnvironmentContributor> {
private ImportPhase phase;
private Iterator<ConfigDataEnvironmentContributor> children;
private Iterator<ConfigDataEnvironmentContributor> current;
private ConfigDataEnvironmentContributor next;
private ContributorIterator() {
this.phase = ImportPhase.AFTER_PROFILE_ACTIVATION;
this.children = getChildren(this.phase).iterator();
this.current = Collections.emptyIterator();
}
@Override
public boolean hasNext() {
return fetchIfNecessary() != null;
}
@Override
public ConfigDataEnvironmentContributor next() {
ConfigDataEnvironmentContributor next = fetchIfNecessary();
if (next == null) {
throw new NoSuchElementException();
}
this.next = null;
return next;
}
private ConfigDataEnvironmentContributor fetchIfNecessary() {
if (this.next != null) {
return this.next;
}
if (this.current.hasNext()) {
this.next = this.current.next();
return this.next;
}
if (this.children.hasNext()) {
this.current = this.children.next().iterator();
return fetchIfNecessary();
}
if (this.phase == ImportPhase.AFTER_PROFILE_ACTIVATION) {
this.phase = ImportPhase.BEFORE_PROFILE_ACTIVATION;
this.children = getChildren(this.phase).iterator();
return fetchIfNecessary();
}
if (this.phase == ImportPhase.BEFORE_PROFILE_ACTIVATION) {
this.phase = null;
this.next = ConfigDataEnvironmentContributor.this;
return this.next;
}
return null;
}
}
}
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