clipboard.java

《移动Agent技术》一书的所有章节源代码。

/*
 * @(#)Clipboard.java	1.5 96/11/23
 * 
 * Copyright (c) 1995, 1996 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * This software is the confidential and proprietary information of Sun
 * Microsystems, Inc. ("Confidential Information").  You shall not
 * disclose such Confidential Information and shall use it only in
 * accordance with the terms of the license agreement you entered into
 * with Sun.
 * 
 * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
 * SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES
 * SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
 * THIS SOFTWARE OR ITS DERIVATIVES.
 * 
 * CopyrightVersion 1.1_beta
 * 
 */

package java.awt.datatransfer;

/**
 * A class which implements a mechanism to transfer data using 
 * cut/copy/paste operations.
 *
 * @version 	1.5, 11/23/96
 * @author	Amy Fowler
 */
public class Clipboard {

    String name;

    protected ClipboardOwner owner;
    protected Transferable contents;

    /**
     * Creates a clipboard object.
     */
    public Clipboard(String name) {
        this.name = name;
    }

    /**
     * Returns the name of this clipboard object.
     */
    public String getName() {
        return name;
    }

    /**
     * Sets the current contents of the clipboard to the specified
     * transferable object and registers the specified clipboard owner
     * as the owner of the new contents.  If there is an existing owner 
     * registered, that owner is notified that it no longer holds ownership
     * of the clipboard contents.
     * @param content the transferable object representing the clipboard content
     * @param owner the object which owns the clipboard content
     */
    public synchronized void setContents(Transferable contents, ClipboardOwner owner) {
	if (this.owner != null && this.owner != owner) {
	    this.owner.lostOwnership(this, this.contents);
	}
	this.owner = owner;
	this.contents = contents;
    }

    /**
     * Returns a transferable object representing the current contents
     * of the clipboard.  If the clipboard currently has no contents,
     * it returns null.
     * @param requestor the object requesting the clip data
     * @return the current transferable object on the clipboard
     */
    public synchronized Transferable getContents(Object requestor) {
        return contents;
    }

}