| /******************************************************************************* |
| * Copyright (c) 2007, 2009 Oracle. 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: |
| * Oracle - initial API and implementation |
| ******************************************************************************/ |
| package org.eclipse.jpt.common.utility.internal; |
| |
| import java.io.Serializable; |
| |
| /** |
| * This interface defines a simple API for allowing "pluggable" |
| * string matchers that can be configured with a pattern string |
| * then used to determine what strings match the pattern. |
| */ |
| public interface StringMatcher { |
| |
| /** |
| * Set the pattern string used to determine future |
| * matches. The format and semantics of the pattern |
| * string are determined by the contract between the |
| * client and the server. |
| */ |
| void setPatternString(String patternString); |
| |
| /** |
| * Return whether the specified string matches the |
| * established pattern string. The semantics of a match |
| * is determined by the contract between the |
| * client and the server. |
| */ |
| boolean matches(String string); |
| |
| |
| final class Null implements StringMatcher, Serializable { |
| public static final StringMatcher INSTANCE = new Null(); |
| public static StringMatcher instance() { |
| return INSTANCE; |
| } |
| // ensure single instance |
| private Null() { |
| super(); |
| } |
| public void setPatternString(String patternString) { |
| // ignore the pattern string |
| } |
| public boolean matches(String string) { |
| // everything is a match |
| return true; |
| } |
| @Override |
| public String toString() { |
| return "StringMatcher.Null"; //$NON-NLS-1$ |
| } |
| private static final long serialVersionUID = 1L; |
| private Object readResolve() { |
| // replace this object with the singleton |
| return INSTANCE; |
| } |
| } |
| |
| } |