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