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/*******************************************************************************
* Copyright (c) 2007, 2008 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.utility.internal;
/**
* 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 {
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";
}
}
}
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