hadoop Parameters 源码
haddop Parameters 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/lib/wsrs/Parameters.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.lib.wsrs;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.util.Lists;
import java.util.List;
import java.util.Map;
/**
* Class that contains all parsed JAX-RS parameters.
* <p>
* Instances are created by the {@link ParametersProvider} class.
*/
@InterfaceAudience.Private
public class Parameters {
private Map<String, List<Param<?>>> params;
/**
* Constructor that receives the request parsed parameters.
*
* @param params the request parsed parameters.
*/
public Parameters(Map<String, List<Param<?>>> params) {
this.params = params;
}
/**
* Returns the value of a request parsed parameter.
*
* @param name parameter name.
* @param klass class of the parameter, used for value casting.
* @return the value of the parameter.
*/
@SuppressWarnings("unchecked")
public <V, T extends Param<V>> V get(String name, Class<T> klass) {
List<Param<?>> multiParams = (List<Param<?>>)params.get(name);
if (multiParams != null && multiParams.size() > 0) {
return ((T) multiParams.get(0)).value(); // Return first value;
}
return null;
}
/**
* Returns the values of a request parsed parameter.
*
* @param name parameter name.
* @param klass class of the parameter, used for value casting.
* @return the values of the parameter.
*/
@SuppressWarnings("unchecked")
public <V, T extends Param<V>> List<V> getValues(String name, Class<T> klass) {
List<Param<?>> multiParams = (List<Param<?>>)params.get(name);
List<V> values = Lists.newArrayList();
if (multiParams != null) {
for (Param<?> param : multiParams) {
V value = ((T) param).value();
if (value != null) {
values.add(value);
}
}
}
return values;
}
}
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