| package org.apache.commons.digester3.examples.plugins.pipeline; |
| |
| /* |
| * 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. |
| */ |
| |
| import org.apache.commons.digester3.Digester; |
| |
| /** |
| * An implementation of the Transform interface which replaces all occurrences |
| * of a specified string with a different string. |
| * <p> |
| * Because this class wishes to configure instances via nested "from" and |
| * "to" tags, it needs to define an addRules method to add rules to the |
| * Digester dynamically. Note that there are different ways of defining the |
| * rules though; for example they can be defined in a separate |
| * SubstituteTransformRuleInfo class. |
| */ |
| public class SubstituteTransform |
| implements Transform |
| { |
| |
| private String from; |
| |
| private String to; |
| |
| public void setFrom( final String from ) |
| { |
| this.from = from; |
| } |
| |
| public void setTo( final String to ) |
| { |
| this.to = to; |
| } |
| |
| @Override |
| public String transform( final String s ) |
| { |
| final StringBuilder buf = new StringBuilder( s ); |
| while ( true ) |
| { |
| final int idx = buf.indexOf( from ); |
| if ( idx == -1 ) |
| { |
| break; |
| } |
| |
| buf.replace( idx, idx + from.length(), to ); |
| } |
| return buf.toString(); |
| } |
| |
| public static void addRules( final Digester d, final String patternPrefix ) |
| { |
| d.addCallMethod( patternPrefix + "/from", "setFrom", 0 ); |
| d.addCallMethod( patternPrefix + "/to", "setTo", 0 ); |
| } |
| |
| } |