hadoop Query 源码
haddop Query 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/store/records/Query.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.hadoop.hdfs.server.federation.store.records;
/**
* Check if a record matches a query. The query is usually a partial record.
*
* @param <T> Type of the record to query.
*/
public class Query<T extends BaseRecord> {
/** Partial object to compare against. */
private final T partial;
/**
* Create a query to search for a partial record.
*
* @param part It defines the attributes to search.
*/
public Query(final T part) {
this.partial = part;
}
/**
* Get the partial record used to query.
*
* @return The partial record used for the query.
*/
public T getPartial() {
return this.partial;
}
/**
* Check if a record matches the primary keys or the partial record.
*
* @param other Record to check.
* @return If the record matches. Don't match if there is no partial.
*/
public boolean matches(T other) {
if (this.partial == null) {
return false;
}
return this.partial.like(other);
}
@Override
public String toString() {
return "Checking: " + this.partial;
}
}
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