// *************************************************************************************************************************** | |
// * 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 * | |
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// * specific language governing permissions and limitations under the License. * | |
// *************************************************************************************************************************** | |
package org.apache.juneau.internal; | |
import java.util.*; | |
import org.apache.juneau.*; | |
/** | |
* Represents a wrapped {@link Map} where entries in the map can be removed without affecting the underlying map. | |
* | |
* @param <T> The class type of the wrapped bean. | |
*/ | |
@SuppressWarnings("rawtypes") | |
public class DelegateMap<T extends Map> extends ObjectMap implements Delegate<T> { | |
private static final long serialVersionUID = 1L; | |
private transient ClassMeta<T> classMeta; | |
/** | |
* Constructor. | |
* | |
* @param m The metadata object that created this delegate object. | |
* @param session The current bean session. | |
*/ | |
public DelegateMap(T m, BeanSession session) { | |
this.classMeta = session.getClassMetaForObject(m); | |
for (Map.Entry e : (Set<Map.Entry>)m.entrySet()) | |
put(StringUtils.stringify(e.getKey()), e.getValue()); | |
} | |
@Override /* Delegate */ | |
public ClassMeta<T> getClassMeta() { | |
return classMeta; | |
} | |
/** | |
* Remove all but the specified keys from this map. | |
* | |
* <p> | |
* This does not affect the underlying map. | |
* | |
* @param keys The remaining keys in the map (in the specified order). | |
* @return This object (for method chaining). | |
*/ | |
public DelegateMap<T> filterKeys(List<String> keys) { | |
ObjectMap m2 = new ObjectMap(); | |
for (String k : keys) | |
if (containsKey(k)) | |
m2.put(k, get(k)); | |
this.clear(); | |
this.putAll(m2); | |
return this; | |
} | |
} |