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| 30 day Evaluation Version distributed via the Maven Jar Repository. Clover is not free. You have 30 days to evaluate it. Please visit http://www.thecortex.net/clover to obtain a licensed version of Clover | |||||||||||||||||||
| Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
| WeakReferencedValueMap.java | 50% | 63.6% | 62.5% | 61.9% |
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/*
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* Joey and its relative products are published under the terms
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* of the Apache Software License.
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*/
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package org.asyrinx.brownie.core.collection;
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import java.lang.ref.Reference;
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import java.lang.ref.ReferenceQueue;
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import java.lang.ref.WeakReference;
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import java.util.Collection;
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import java.util.HashMap;
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import java.util.Map;
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import org.asyrinx.brownie.core.collection.wrapper.MapWrapper;
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/**
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* 弱参照(WeakReference)で保持された値をキーと関連付けて保持するマップです。
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* putメソッドでkeyに関連付けられたvalueは、弱参照以外の参照がなくなると、
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* ガベッジコレクションの対象となり、valueへの参照はnullにクリアされます。 <br>
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* valuesメソッドで取得できる参照は消されているかも知れないので、 values自身を使用不可としています。
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* 関連付けられた値にアクセスする際には、get必ずメソッドを使用してください。 <br>
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*
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* @author Akima
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*/
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public class WeakReferencedValueMap extends MapWrapper { |
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public WeakReferencedValueMap() {
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this(new HashMap()); |
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} |
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/**
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* Constructor for WeakReferencedValueMap.
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*
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* @param impl
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*/
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public WeakReferencedValueMap(Map impl) {
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super(impl);
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} |
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/**
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*/
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public Object get(Object key) {
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Reference ref = (Reference) super.get(key);
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if (ref == null) |
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return null; |
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else
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return ref.get();
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} |
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/**
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*/
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public Object put(Object key, Object value) {
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//if (get(key) == value)
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// return null;
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return super.put(key, new WeakValue(value)); |
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} |
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/**
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*/
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public Collection values() {
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throw new UnsupportedOperationException("この操作は使用できません。"); |
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} |
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static class WeakValue extends WeakReference { |
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public WeakValue(Object referent) {
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super(referent);
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} |
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public WeakValue(Object referent, ReferenceQueue q) {
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super(referent, q);
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} |
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/**
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* @see java.lang.Object#toString()
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*/
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public String toString() {
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return String.valueOf(super.get()); |
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} |
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} |
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} |
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