| /* |
| * 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; |
| |
| import org.apache.tools.ant.PropertyHelper; |
| |
| /** |
| * Abstract prefixed PropertyEvaluator. |
| */ |
| public abstract class PrefixedEvaluator extends RegexBasedEvaluator { |
| |
| /** |
| * Default prefix delimiter. |
| */ |
| public static final String DEFAULT_DELIMITER = ":"; |
| |
| /** |
| * Create a new PrefixedEvaluator. |
| */ |
| protected PrefixedEvaluator() { |
| this(DEFAULT_DELIMITER); |
| } |
| |
| /** |
| * Create a new PrefixedEvaluator. |
| * |
| * @param delimiter |
| */ |
| protected PrefixedEvaluator(String delimiter) { |
| setDelimiter(delimiter); |
| } |
| |
| /** |
| * Learn whether this evaluator can interpret a property with the given prefix. |
| * |
| * @param prefix |
| * @return <code>true</code> if <code>prefix</code> is recognized, else <code>false</code>. |
| */ |
| protected abstract boolean canInterpret(String prefix); |
| |
| /** |
| * {@inheritDoc} |
| * |
| * @see org.apache.ant.props.RegexBasedEvaluator#evaluate(java.lang.String[], |
| * org.apache.tools.ant.PropertyHelper) |
| */ |
| protected Object evaluate(String[] groups, PropertyHelper propertyHelper) { |
| return canInterpret(groups[1]) ? evaluate(groups[2], groups[1], propertyHelper) : null; |
| } |
| |
| /** |
| * Return the result of evaluating the prefixed property. |
| * |
| * @param property |
| * @param prefix |
| * @param propertyHelper |
| * @return Object if the property can be resolved, else <code>null</code>. |
| */ |
| protected abstract Object evaluate(String property, String prefix, PropertyHelper propertyHelper); |
| |
| /** |
| * Set the String delimiter. |
| * |
| * @param delimiter String |
| */ |
| public void setDelimiter(String delimiter) { |
| if (delimiter == null) { |
| throw new IllegalArgumentException("invalid delimiter: null"); |
| } |
| super.setPattern("^(.*?)" + delimiter + "(.*)$"); |
| } |
| |
| /** |
| * Ignored. |
| * |
| * @see org.apache.ant.props.RegexBasedEvaluator#setPattern(java.lang.String) |
| */ |
| public final void setPattern(String pattern) { |
| } |
| } |