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| <pre><span class="source-line-no">001</span><span id="line-1">// ***************************************************************************************************************************</span> |
| <span class="source-line-no">002</span><span id="line-2">// * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file *</span> |
| <span class="source-line-no">003</span><span id="line-3">// * distributed with this work for additional information regarding copyright ownership. The ASF licenses this file *</span> |
| <span class="source-line-no">004</span><span id="line-4">// * to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance *</span> |
| <span class="source-line-no">005</span><span id="line-5">// * with the License. You may obtain a copy of the License at *</span> |
| <span class="source-line-no">006</span><span id="line-6">// * *</span> |
| <span class="source-line-no">007</span><span id="line-7">// * http://www.apache.org/licenses/LICENSE-2.0 *</span> |
| <span class="source-line-no">008</span><span id="line-8">// * *</span> |
| <span class="source-line-no">009</span><span id="line-9">// * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an *</span> |
| <span class="source-line-no">010</span><span id="line-10">// * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the *</span> |
| <span class="source-line-no">011</span><span id="line-11">// * specific language governing permissions and limitations under the License. *</span> |
| <span class="source-line-no">012</span><span id="line-12">// ***************************************************************************************************************************</span> |
| <span class="source-line-no">013</span><span id="line-13">package org.apache.juneau.internal;</span> |
| <span class="source-line-no">014</span><span id="line-14"></span> |
| <span class="source-line-no">015</span><span id="line-15">import static org.apache.juneau.common.internal.ArgUtils.*;</span> |
| <span class="source-line-no">016</span><span id="line-16"></span> |
| <span class="source-line-no">017</span><span id="line-17">import java.util.*;</span> |
| <span class="source-line-no">018</span><span id="line-18"></span> |
| <span class="source-line-no">019</span><span id="line-19">import org.apache.juneau.*;</span> |
| <span class="source-line-no">020</span><span id="line-20"></span> |
| <span class="source-line-no">021</span><span id="line-21">/**</span> |
| <span class="source-line-no">022</span><span id="line-22"> * Wrapper around a map where the key names are overridden.</span> |
| <span class="source-line-no">023</span><span id="line-23"> *</span> |
| <span class="source-line-no">024</span><span id="line-24"> * <h5 class='section'>See Also:</h5><ul></span> |
| <span class="source-line-no">025</span><span id="line-25"></span> |
| <span class="source-line-no">026</span><span id="line-26"> * </ul></span> |
| <span class="source-line-no">027</span><span id="line-27"> *</span> |
| <span class="source-line-no">028</span><span id="line-28"> * @param <K> The key class type.</span> |
| <span class="source-line-no">029</span><span id="line-29"> * @param <V> The value class type.</span> |
| <span class="source-line-no">030</span><span id="line-30"> */</span> |
| <span class="source-line-no">031</span><span id="line-31">public final class FilteredMap<K,V> extends AbstractMap<K,V> implements Delegate<Map<K,V>> {</span> |
| <span class="source-line-no">032</span><span id="line-32"></span> |
| <span class="source-line-no">033</span><span id="line-33"> final Map<K,V> innerMap;</span> |
| <span class="source-line-no">034</span><span id="line-34"> final Set<Map.Entry<K,V>> entries;</span> |
| <span class="source-line-no">035</span><span id="line-35"> final ClassMeta<Map<K,V>> classMeta;</span> |
| <span class="source-line-no">036</span><span id="line-36"></span> |
| <span class="source-line-no">037</span><span id="line-37"> /**</span> |
| <span class="source-line-no">038</span><span id="line-38"> * Constructor.</span> |
| <span class="source-line-no">039</span><span id="line-39"> *</span> |
| <span class="source-line-no">040</span><span id="line-40"> * @param classMeta The class type of the map being wrapped.</span> |
| <span class="source-line-no">041</span><span id="line-41"> * @param innerMap The map being wrapped. Must not be <jk>null</jk>.</span> |
| <span class="source-line-no">042</span><span id="line-42"> * @param keys The keys in the new map. Must not be <jk>null</jk>.</span> |
| <span class="source-line-no">043</span><span id="line-43"> */</span> |
| <span class="source-line-no">044</span><span id="line-44"> public FilteredMap(ClassMeta<Map<K,V>> classMeta, Map<K,V> innerMap, K[] keys) {</span> |
| <span class="source-line-no">045</span><span id="line-45"> assertArgNotNull("innerMap", innerMap);</span> |
| <span class="source-line-no">046</span><span id="line-46"> assertArgNotNull("keys", keys);</span> |
| <span class="source-line-no">047</span><span id="line-47"></span> |
| <span class="source-line-no">048</span><span id="line-48"> this.classMeta = classMeta;</span> |
| <span class="source-line-no">049</span><span id="line-49"> this.innerMap = innerMap;</span> |
| <span class="source-line-no">050</span><span id="line-50"> List<Map.Entry<K,V>> l = new ArrayList<>(keys.length);</span> |
| <span class="source-line-no">051</span><span id="line-51"> for (K k : keys)</span> |
| <span class="source-line-no">052</span><span id="line-52"> if (innerMap.containsKey(k))</span> |
| <span class="source-line-no">053</span><span id="line-53"> l.add(createEntry(k));</span> |
| <span class="source-line-no">054</span><span id="line-54"> entries = new ListSet<>(l);</span> |
| <span class="source-line-no">055</span><span id="line-55"> }</span> |
| <span class="source-line-no">056</span><span id="line-56"></span> |
| <span class="source-line-no">057</span><span id="line-57"> private Map.Entry<K,V> createEntry(final K key) {</span> |
| <span class="source-line-no">058</span><span id="line-58"> return new Map.Entry<>() {</span> |
| <span class="source-line-no">059</span><span id="line-59"></span> |
| <span class="source-line-no">060</span><span id="line-60"> @Override /* Map.Entry */</span> |
| <span class="source-line-no">061</span><span id="line-61"> public K getKey() {</span> |
| <span class="source-line-no">062</span><span id="line-62"> return key;</span> |
| <span class="source-line-no">063</span><span id="line-63"> }</span> |
| <span class="source-line-no">064</span><span id="line-64"></span> |
| <span class="source-line-no">065</span><span id="line-65"> @Override /* Map.Entry */</span> |
| <span class="source-line-no">066</span><span id="line-66"> public V getValue() {</span> |
| <span class="source-line-no">067</span><span id="line-67"> return innerMap.get(key);</span> |
| <span class="source-line-no">068</span><span id="line-68"> }</span> |
| <span class="source-line-no">069</span><span id="line-69"></span> |
| <span class="source-line-no">070</span><span id="line-70"> @Override /* Map.Entry */</span> |
| <span class="source-line-no">071</span><span id="line-71"> public V setValue(V v) {</span> |
| <span class="source-line-no">072</span><span id="line-72"> return innerMap.put(key, v);</span> |
| <span class="source-line-no">073</span><span id="line-73"> }</span> |
| <span class="source-line-no">074</span><span id="line-74"> };</span> |
| <span class="source-line-no">075</span><span id="line-75"> }</span> |
| <span class="source-line-no">076</span><span id="line-76"></span> |
| <span class="source-line-no">077</span><span id="line-77"></span> |
| <span class="source-line-no">078</span><span id="line-78"> @Override /* Map */</span> |
| <span class="source-line-no">079</span><span id="line-79"> public Set<Map.Entry<K,V>> entrySet() {</span> |
| <span class="source-line-no">080</span><span id="line-80"> return entries;</span> |
| <span class="source-line-no">081</span><span id="line-81"> }</span> |
| <span class="source-line-no">082</span><span id="line-82"></span> |
| <span class="source-line-no">083</span><span id="line-83"> /**</span> |
| <span class="source-line-no">084</span><span id="line-84"> * A set with ordered entries (a List with a Set API).</span> |
| <span class="source-line-no">085</span><span id="line-85"> */</span> |
| <span class="source-line-no">086</span><span id="line-86"> private static final class ListSet<E> extends AbstractSet<E> {</span> |
| <span class="source-line-no">087</span><span id="line-87"></span> |
| <span class="source-line-no">088</span><span id="line-88"> private List<E> entries;</span> |
| <span class="source-line-no">089</span><span id="line-89"></span> |
| <span class="source-line-no">090</span><span id="line-90"> public ListSet(List<E> entries) {</span> |
| <span class="source-line-no">091</span><span id="line-91"> this.entries = entries;</span> |
| <span class="source-line-no">092</span><span id="line-92"> }</span> |
| <span class="source-line-no">093</span><span id="line-93"></span> |
| <span class="source-line-no">094</span><span id="line-94"> @Override /* Set */</span> |
| <span class="source-line-no">095</span><span id="line-95"> public Iterator<E> iterator() {</span> |
| <span class="source-line-no">096</span><span id="line-96"> return entries.iterator();</span> |
| <span class="source-line-no">097</span><span id="line-97"> }</span> |
| <span class="source-line-no">098</span><span id="line-98"></span> |
| <span class="source-line-no">099</span><span id="line-99"> @Override /* Set */</span> |
| <span class="source-line-no">100</span><span id="line-100"> public int size() {</span> |
| <span class="source-line-no">101</span><span id="line-101"> return entries.size();</span> |
| <span class="source-line-no">102</span><span id="line-102"> }</span> |
| <span class="source-line-no">103</span><span id="line-103"> }</span> |
| <span class="source-line-no">104</span><span id="line-104"></span> |
| <span class="source-line-no">105</span><span id="line-105"> @Override /* Delegate */</span> |
| <span class="source-line-no">106</span><span id="line-106"> public ClassMeta<Map<K,V>> getClassMeta() {</span> |
| <span class="source-line-no">107</span><span id="line-107"> return classMeta;</span> |
| <span class="source-line-no">108</span><span id="line-108"> }</span> |
| <span class="source-line-no">109</span><span id="line-109">}</span> |
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| </pre> |
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