dirtyflagmap.java

定时器开源项目, 相对于 jcrontab, Quartz 算是更完整的一个项目, 随著开发的版本上来, 他已经脱离只是写在程序里面的计时器, 在指定的时间或区间, 处理所指定的事件. 也加入了 se

/*
 * Copyright James House (c) 2001-2004
 * 
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met: 1.
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer. 2. Redistributions in
 * binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other
 * materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.quartz.utils;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

/**
 * <p>
 * An implementation of <code>Map</code> that wraps another <code>Map</code>
 * and flags itself 'dirty' when it is modified.
 * </p>
 * 
 * @author James House
 */
public class DirtyFlagMap implements Map, Cloneable, java.io.Serializable {

    /*
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     * 
     * Data members.
     * 
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     */

    private boolean dirty = false;

    private Map map;

    /*
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     * 
     * Constructors.
     * 
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     */

    /**
     * <p>
     * Create a DirtyFlagMap that 'wraps' the given <code>Map</code>.
     * </p>
     */
    public DirtyFlagMap(Map mapToWrap) {
        if (mapToWrap == null)
                throw new IllegalArgumentException("mapToWrap cannot be null!");

        map = mapToWrap;
    }

    /**
     * <p>
     * Create a DirtyFlagMap that 'wraps' a <code>HashMap</code>.
     * </p>
     * 
     * @see java.util.HashMap
     */
    public DirtyFlagMap() {
        map = new HashMap();
    }

    /**
     * <p>
     * Create a DirtyFlagMap that 'wraps' a <code>HashMap</code> that has the
     * given initial capacity.
     * </p>
     * 
     * @see java.util.HashMap
     */
    public DirtyFlagMap(int initialCapacity) {
        map = new HashMap(initialCapacity);
    }

    /**
     * <p>
     * Create a DirtyFlagMap that 'wraps' a <code>HashMap</code> that has the
     * given initial capacity and load factor.
     * </p>
     * 
     * @see java.util.HashMap
     */
    public DirtyFlagMap(int initialCapacity, float loadFactor) {
        map = new HashMap(initialCapacity, loadFactor);
    }

    /*
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     * 
     * Interface.
     * 
     * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     */

    /**
     * <p>
     * Clear the 'dirty' flag (set dirty flag to <code>false</code>).
     * </p>
     */
    public void clearDirtyFlag() {
        dirty = false;
    }

    /**
     * <p>
     * Determine whether the <code>Map</code> is flagged dirty.
     * </p>
     */
    public boolean isDirty() {
        return dirty;
    }

    /**
     * <p>
     * Get a direct handle to the underlying Map.
     * </p>
     */
    public Map getWrappedMap() {
        return map;
    }

    public void clear() {
        dirty = true;

        map.clear();
    }

    public boolean containsKey(Object key) {
        return map.containsKey(key);
    }

    public boolean containsValue(Object val) {
        return map.containsValue(val);
    }

    public Set entrySet() {
        return map.entrySet();
    }

    public boolean equals(Object obj) {
        if (obj == null || !(obj instanceof DirtyFlagMap)) return false;

        return map.equals(((DirtyFlagMap) obj).getWrappedMap());
    }

    public Object get(Object key) {
        return map.get(key);
    }

    public boolean isEmpty() {
        return map.isEmpty();
    }

    public Set keySet() {
        return map.keySet();
    }

    public Object put(Object key, Object val) {
        dirty = true;

        return map.put(key, val);
    }

    public void putAll(Map t) {
        if (!t.isEmpty()) dirty = true;

        map.putAll(t);
    }

    public Object remove(Object key) {
        Object obj = map.remove(key);

        if (obj != null) dirty = true;

        return obj;
    }

    public int size() {
        return map.size();
    }

    public Collection values() {
        return map.values();
    }

    public Object clone() {
        DirtyFlagMap copy;
        try {
            copy = (DirtyFlagMap) super.clone();
            if (map instanceof HashMap)
                    copy.map = (Map) ((HashMap) map).clone();
        } catch (CloneNotSupportedException ex) {
            throw new IncompatibleClassChangeError("Not Cloneable.");
        }

        return copy;
    }

}