77 lines
2.2 KiB
Java
77 lines
2.2 KiB
Java
/*******************************************************************************
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* Copyright (c) 2002 - 2006 IBM Corporation.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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*******************************************************************************/
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package com.ibm.wala.util.collections;
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import java.lang.reflect.Method;
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import java.util.LinkedHashMap;
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import java.util.Map;
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import com.ibm.wala.util.debug.UnimplementedError;
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/**
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* a debugging aid. This implementation complains if you stick an object in here which appears to use System.identityHashCode()
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*/
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public class ParanoidHashMap<K, V> extends LinkedHashMap<K, V> {
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public static final long serialVersionUID = 909018793791787198L;
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/**
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* @param t
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* @throws NullPointerException if t is null
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*/
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public ParanoidHashMap(Map<K, V> t) throws NullPointerException {
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super(t.size());
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putAll(t);
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}
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public ParanoidHashMap(int size) {
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super(size);
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}
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public ParanoidHashMap() {
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}
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/*
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* @see java.util.Map#put(java.lang.Object, java.lang.Object)
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*/
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@Override
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public V put(K arg0, V arg1) {
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assertOverridesHashCode(arg0);
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return super.put(arg0, arg1);
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}
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public static void assertOverridesHashCode(Object o) throws UnimplementedError {
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if (o != null && o.hashCode() == System.identityHashCode(o)) {
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try {
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Method method = o.getClass().getMethod("hashCode");
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if (method.getDeclaringClass() == Object.class) {
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assert false : o.getClass().toString();
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}
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} catch (Exception e) {
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assert false : "Could not find hashCode method";
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}
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}
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}
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/*
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* @see java.util.Map#putAll(java.util.Map)
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*/
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@Override
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public void putAll(Map<? extends K, ? extends V> arg0) {
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if (arg0 == null) {
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throw new IllegalArgumentException("arg0 is null");
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}
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for (Map.Entry<? extends K, ? extends V> E : arg0.entrySet()) {
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put(E.getKey(), E.getValue());
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}
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}
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}
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