/*
 * $Id$
 *
 * Copyright 1996-2008 Sun Microsystems, Inc.  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.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */
package com.sun.javatest.tool;

import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.lang.ref.WeakReference;
import java.util.HashMap;
import java.util.Map;
import javax.swing.Action;
import javax.swing.Icon;
import javax.swing.KeyStroke;

import com.sun.javatest.util.DynamicArray;
import com.sun.javatest.util.I18NResourceBundle;

/**
 * Standard template for creation of an Action to be used in a Tool.
 */
public abstract class ToolAction implements Action
{
    /**
     * Construct an action with a specific mnemonic.  This is the
     * non-internationalized version and not recommended.  See
     * <code>Action</code> for details on the parameters.
     * @param name Name of this action
     * @param desc Description of this action
     * @param mnemonic Mnemonic associated with this action
     * @see javax.swing.Action
     */
    public ToolAction(String name, String desc, int mnemonic) {
        this.name = name;
        this.desc = desc;
        this.mnemonic = new Integer(mnemonic);
        enabled = true;
    }

    /**
     * Construct an internationalized action.
     * @param uif Factory to use for getting strings.
     * @param key Key for retrieving internationalized strings from the
     *        bundle.
     * @see #ToolAction(I18NResourceBundle,String)
     */
    public ToolAction(UIFactory uif, String key) {
        this(uif.getI18NResourceBundle(), key);
    }

    /**
     * Construct an internationalized action.
     * @param uif Factory to use for getting strings.
     * @param key Key for retrieving internationalized strings from the
     *        bundle.
     * @param needIcon True if an icon resource should be associated with
     *        this action.  Will be retrieved throught the uif.  And
     *        put into the <code>SMALL_ICON</code> property.
     * @see #ToolAction(I18NResourceBundle,String)
     * @see javax.swing.Action#SMALL_ICON
     */
    public ToolAction(UIFactory uif, String key, boolean needIcon) {
        this(uif, key);
        if (needIcon)
            putValue(Action.SMALL_ICON, uif.createIcon(key));
    }

    /**
     * Construct an internationalized action.
     * The resources used are:
     * <table>
     * <tr><td><i>uiKey</i>.act  <td>the name for the button
     * <tr><td><i>uiKey</i>.tip  <td>the tool tip for the action
     * <tr><td><i>uiKey</i>.mne  <td>mnemonic for this action
     * </table>
     * @param i18n Resource bundle to use when getting action properties
     * @param key Key for retrieving internationalized strings from the
     *        bundle.
     */
    public ToolAction(I18NResourceBundle i18n, String key) {
        this( i18n.getString(key + ".act"),
              i18n.getString(key + ".tip"),
              getMnemonic(i18n, key + ".mne") );
    }

    /**
     * Gets one of this object's properties using the associated key.
     * @param key the key of the property to be returned
     * @return the value of the property with the given key
     * @see #putValue
     */
    public Object getValue(String key) {
        if (key == null)
            throw new NullPointerException();

        if (key.equals(NAME))
            return name;
        else if (key.equals(SHORT_DESCRIPTION))
            return desc;
        else if (key.equals(MNEMONIC_KEY))
            return mnemonic;
        else if (key.equals(SMALL_ICON))
            return icon;
        else
            return (misc == null ? null : misc.get(key));
    }

    /**
     * Sets one of this object's properties using the associated key.
     * If the value has changed, a <code>PropertyChangeEvent</code> is sent
     * to listeners.
     * @param key    the key of the property to be stored
     * @param newVal  the new value for the property
     */
    public void putValue(String key, Object newVal) {
        Object oldVal;

        if (key.equals(NAME)) {
            if (equal(newVal, name))
                return;
            oldVal = name;
            name = (String) newVal;
        }
        else if (key.equals(SHORT_DESCRIPTION)) {
            if (equal(newVal, desc))
                return;
            oldVal = desc;
            desc = (String) newVal;
        }
        else if (key.equals(MNEMONIC_KEY)) {
            if (equal(newVal, mnemonic))
                return;
            oldVal = mnemonic;
            mnemonic = (Integer) newVal;
        }
        else if (key.equals(SMALL_ICON)) {
            if (equal(newVal, icon))
                return;
            oldVal = icon;
            icon = (Icon) newVal;
        }
        else {
            if (misc == null)
                misc = new HashMap();
            oldVal = misc.get(key);
            if (equal(newVal, oldVal))
                return;
            misc.put(key, newVal);
        }
        firePropertyChangeEvent(key, oldVal, newVal);
    }

    public boolean isEnabled() {
        // no need to synchronize just to read a single simple boolean
        return enabled;
    }

    public void setEnabled(boolean newVal) {
        if (enabled == newVal)
            return;

        boolean oldVal = enabled;
        enabled = newVal;

        if (listeners.length > 0)
            firePropertyChangeEvent("enabled", new Boolean(oldVal), new Boolean(newVal));
    }

    public synchronized void addPropertyChangeListener(PropertyChangeListener listener) {
        listeners = (WeakReference[]) DynamicArray.append(listeners, new WeakReference(listener));
    }

    public synchronized void removePropertyChangeListener(PropertyChangeListener listener) {
        WeakReference[] l = listeners;
        int size = l.length;
        for (int i = size - 1; i >= 0; i--) {
            if (l[i].get() == listener)
                System.arraycopy(l, i+1, l, i, (--size) - i);
        }

        if (size < l.length) {
            listeners = new WeakReference[size];
            System.arraycopy(l, 0, listeners, 0, size);
        }
    }

    private void firePropertyChangeEvent(String name, Object oldVal, Object newVal) {
        PropertyChangeEvent ev = null; // lazy create event if needed
        WeakReference[] l = listeners;
        if (l.length > 0) {
            for (int i = l.length - 1; i >= 0; i--) {
                PropertyChangeListener pcl = (PropertyChangeListener) (l[i].get());
                if (pcl != null) {
                    if (ev == null)
                        ev = new PropertyChangeEvent(this, name, oldVal, newVal);
                    pcl.propertyChange(ev);
                }
            }
        }
    }


    private static int getMnemonic(I18NResourceBundle i18n, String key) {
        String keyString = i18n.getString(key);
        KeyStroke keyStroke = KeyStroke.getKeyStroke(keyString);
        return (keyStroke == null ? 0 : keyStroke.getKeyCode());
    }

    private static boolean equal(Object a, Object b) {
        return (a == null ? b == null : a.equals(b));
    }

    private String name;
    private String desc;
    private Integer mnemonic;
    private Icon icon;
    private Map misc;
    private boolean enabled = true;

    private WeakReference[] listeners = new WeakReference[0];
}
