| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| package org.apache.tools.ant.util.regexp; |
| |
| import org.apache.tools.ant.BuildException; |
| import org.apache.tools.ant.MagicNames; |
| import org.apache.tools.ant.Project; |
| import org.apache.tools.ant.util.ClasspathUtils; |
| import org.apache.tools.ant.util.JavaEnvUtils; |
| |
| /*** |
| * Regular expression factory, which will create Regexp objects. The |
| * actual implementation class depends on the System or Ant Property: |
| * <code>ant.regexp.regexpimpl</code>. |
| * |
| */ |
| public class RegexpFactory extends RegexpMatcherFactory { |
| |
| /** Constructor for RegexpFactory */ |
| public RegexpFactory() { |
| } |
| |
| /*** |
| * Create a new regular expression matcher instance. |
| * @return the matcher instance |
| * @throws BuildException on error |
| */ |
| public Regexp newRegexp() throws BuildException { |
| return (Regexp) newRegexp(null); |
| } |
| |
| /*** |
| * Create a new regular expression matcher instance. |
| * |
| * @param p Project whose ant.regexp.regexpimpl property will be used. |
| * @return the matcher instance |
| * @throws BuildException on error |
| */ |
| public Regexp newRegexp(Project p) throws BuildException { |
| String systemDefault = null; |
| if (p == null) { |
| systemDefault = System.getProperty(MagicNames.REGEXP_IMPL); |
| } else { |
| systemDefault = p.getProperty(MagicNames.REGEXP_IMPL); |
| } |
| |
| if (systemDefault != null) { |
| return createRegexpInstance(systemDefault); |
| // XXX should we silently catch possible exceptions and try to |
| // load a different implementation? |
| } |
| |
| Throwable cause = null; |
| |
| try { |
| testAvailability("java.util.regex.Matcher"); |
| return createRegexpInstance("org.apache.tools.ant.util.regexp.Jdk14RegexpRegexp"); |
| } catch (BuildException be) { |
| cause = orCause( |
| cause, be, |
| JavaEnvUtils.getJavaVersionNumber() < JavaEnvUtils.VERSION_1_4); |
| } |
| |
| try { |
| testAvailability("org.apache.oro.text.regex.Pattern"); |
| return createRegexpInstance("org.apache.tools.ant.util.regexp.JakartaOroRegexp"); |
| } catch (BuildException be) { |
| cause = orCause(cause, be, true); |
| } |
| |
| try { |
| testAvailability("org.apache.regexp.RE"); |
| return createRegexpInstance("org.apache.tools.ant.util.regexp.JakartaRegexpRegexp"); |
| } catch (BuildException be) { |
| cause = orCause(cause, be, true); |
| } |
| throw new BuildException("No supported regular expression matcher found" |
| + (cause != null ? ": " + cause : ""), cause); |
| } |
| |
| /** |
| * Wrapper over RegexpMatcherFactory.createInstance that ensures that |
| * we are dealing with a Regexp implementation. |
| * @param classname the name of the class to use. |
| * @return the instance. |
| * @throws BuildException if there is a problem. |
| * @since 1.3 |
| * |
| * @see RegexpMatcherFactory#createInstance(String) |
| */ |
| protected Regexp createRegexpInstance(String classname) throws BuildException { |
| return (Regexp) ClasspathUtils.newInstance(classname, RegexpFactory.class.getClassLoader(), |
| Regexp.class); |
| } |
| |
| } |