| /* |
| * The Apache Software License, Version 1.1 |
| * |
| * Copyright (c) 2000 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, if |
| * any, must include the following acknowlegement: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowlegement may appear in the software itself, |
| * if and wherever such third-party acknowlegements normally appear. |
| * |
| * 4. The names "The Jakarta Project", "Ant", and "Apache Software |
| * Foundation" must not be used to endorse or promote products derived |
| * from this software without prior written permission. For written |
| * permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache" |
| * nor may "Apache" appear in their names without prior written |
| * permission of the Apache Group. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| */ |
| |
| package org.apache.tools.ant.util.regexp; |
| |
| import org.apache.tools.ant.BuildException; |
| |
| /** |
| * Simple Factory Class that produces an implementation of |
| * RegexpMatcher based on the system property |
| * <code>ant.regexp.matcherimpl</code> and the classes |
| * available. |
| * |
| * <p>In a more general framework this class would be abstract and |
| * have a static newInstance method.</p> |
| * |
| * @author <a href="mailto:stefan.bodewig@epost.de">Stefan Bodewig</a> |
| */ |
| public class RegexpMatcherFactory { |
| |
| public RegexpMatcherFactory() {} |
| |
| public RegexpMatcher newRegexpMatcher() throws BuildException { |
| String systemDefault = System.getProperty("ant.regexp.matcherimpl"); |
| if (systemDefault != null) { |
| return createInstance(systemDefault); |
| // XXX should we silently possible exceptions and try to |
| // load a different implementation? |
| } |
| |
| try { |
| return createInstance("org.apache.tools.ant.util.regexp.Jdk14RegexpMatcher"); |
| } catch (BuildException be) {} |
| |
| try { |
| return createInstance("org.apache.tools.ant.util.regexp.JakartaOroMatcher"); |
| } catch (BuildException be) {} |
| |
| try { |
| return createInstance("org.apache.tools.ant.util.regexp.JakartaRegexpMatcher"); |
| } catch (BuildException be) {} |
| |
| throw new BuildException("No supported regular expression matcher found"); |
| } |
| |
| protected RegexpMatcher createInstance(String className) |
| throws BuildException { |
| try { |
| Class implClass = Class.forName(className); |
| return (RegexpMatcher) implClass.newInstance(); |
| } catch (Throwable t) { |
| throw new BuildException(t); |
| } |
| } |
| } |