acceptallfilter.java

来自「jfa2ce 源码帮助开发人员更好的理解运用」· Java 代码 · 共 51 行

/*******************************************************************************
 * Copyright (c) 2004, 2005 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jface.viewers;


/**
 * Filter that accepts everything. Available as a singleton since having
 * more than one instance would be wasteful.
 * 
 * @since 3.1
 */
public final class AcceptAllFilter implements IFilter {

	/**
	 * Returns the singleton instance of AcceptAllFilter
	 * 
	 * @return the singleton instance of AcceptAllFilter
	 */
	public static IFilter getInstance() {
		return singleton;
	}
	
	/**
	 * The singleton instance
	 */
	private static IFilter singleton = new AcceptAllFilter();
	
	/* (non-Javadoc)
	 * @see org.eclipse.jface.viewers.deferred.IFilter#select(java.lang.Object)
	 */
	public boolean select(Object toTest) {
		return true;
	}
	
    /* (non-Javadoc)
     * @see java.lang.Object#equals(java.lang.Object)
     */
	public boolean equals(Object other) {
		return other == this || other instanceof AcceptAllFilter;
	}

}