| /* |
| * 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.ant.props.stringops; |
| |
| import org.apache.tools.ant.PropertyHelper; |
| import org.apache.tools.ant.util.regexp.Regexp; |
| |
| /** |
| * DeletePartOperation to be subclassed for Delete[Start|End][Greedy|Reluctant].. |
| */ |
| public abstract class DeletePartOperation extends PatternOperation { |
| protected static final boolean GREEDY = true; |
| protected static final boolean RELUCTANT = false; |
| |
| private boolean greedy; |
| |
| /** |
| * Construct a new DeletePartOperation. |
| */ |
| protected DeletePartOperation(String pattern, boolean greedy) { |
| super(pattern); |
| this.greedy = greedy; |
| } |
| |
| /** {@inheritDoc} */ |
| protected Object evaluate(String[] groups, PropertyHelper propertyHelper) { |
| Object value = propertyHelper.getProperty(groups[1]); |
| if (value != null) { |
| String s = value.toString(); |
| StringBuffer sb = new StringBuffer(groups[2]); |
| convertToRegex(sb, greedy); |
| String specialized = specializePattern(sb.toString()); |
| Regexp regexp = createRegexp(specialized, propertyHelper.getProject()); |
| String result = regexp.substitute(s, "\\1", Regexp.REPLACE_FIRST); |
| return result; |
| } |
| return null; |
| } |
| |
| /** |
| * Specialize the RE pattern for the purposes of the specific subclass. |
| * @param pattern partial RE pattern. |
| * @return pattern including one group. |
| */ |
| protected abstract String specializePattern(String pattern); |
| |
| } |