/*

* Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved.

* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

*

* This code is free software; you can redistribute it and/or modify it

* under the terms of the GNU General Public License version 2 only, as

* published by the Free Software Foundation. Oracle designates this

* particular file as subject to the Classpath exception as provided

* by Oracle in the LICENSE file that accompanied this code.

*

* This code is distributed in the hope that it will be useful, but WITHOUT

* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License

* version 2 for more details (a copy is included in the LICENSE file that

* accompanied this code).

*

* You should have received a copy of the GNU General Public License version

* 2 along with this work; if not, write to the Free Software Foundation,

* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

*

* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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*/

package com.sun.btrace;

import java.util.Collection;

import java.util.HashMap;

import java.util.Map;

import java.util.Set;

import java.util.WeakHashMap;

/**

* Instances of this class are used to store aggregate

* tracing data in BTrace.

*

* @author A. Sundararajan

*/

final class BTraceMap<K,V> implements Map<K,V>, Cloneable {

//private int numItems;

private final Map<K,V> m;

private boolean isWeak;

BTraceMap(Map<K,V> m) {

if (m == null) {

throw new NullPointerException();

}

this.m = m;

isWeak = (m instanceof WeakHashMap);

}

@Override

public synchronized int size() {

return m.size();

}

@Override

public synchronized boolean isEmpty(){

return m.isEmpty();

}

@Override

public synchronized boolean containsKey(Object key) {

return m.containsKey(key);

}

@Override

public synchronized boolean containsValue(Object value){

return m.containsValue(value);

}

@Override

public synchronized V get(Object key) {

return m.get(key);

}

@Override

public synchronized V put(K key, V value) {

return m.put(key, value);

}

@Override

public synchronized V remove(Object key) {

return m.remove(key);

}

@Override

public synchronized void putAll(Map<? extends K, ? extends V> map) {

m.putAll(map);

}

@Override

public synchronized void clear() {

m.clear();

}

private transient Set<K> keySet = null;

private transient Set<Map.Entry<K,V>> entrySet = null;

private transient Collection<V> values = null;

@Override

public synchronized Set<K> keySet() {

if (keySet == null) {

keySet = m.keySet();

}

return keySet;

}

@Override

public synchronized Set<Map.Entry<K,V>> entrySet() {

if (entrySet == null) {

entrySet = m.entrySet();

}

return entrySet;

}

@Override

public synchronized Collection<V> values() {

if (values == null) {

values = m.values();

}

return values;

}

@Override

public synchronized boolean equals(Object o) {

return m.equals(o);

}

@Override

public synchronized int hashCode() {

return m.hashCode();

}

@Override

public synchronized String toString() {

return m.toString();

}

@Override

protected Object clone() throws CloneNotSupportedException {

return new BTraceMap(isWeak ? new WeakHashMap() : new HashMap());

}

}