| package org.apache.commons.digester3.substitution; |
| |
| /* |
| * 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.Substitutor; |
| |
| import org.xml.sax.Attributes; |
| |
| /** |
| * Substitutor implementation that support variable replacement for both attributes and body text. The actual expansion |
| * of variables into text is delegated to {@link VariableExpander} implementations. Supports setting an expander just |
| * for body text or just for attributes. Also supported is setting no expanders for body text and for attributes. |
| * |
| * @since 1.6 |
| */ |
| public class VariableSubstitutor |
| extends Substitutor |
| { |
| |
| /** |
| * The expander to be used to expand variables in the attributes. Null when no expansion should be performed. |
| */ |
| private final VariableExpander attributesExpander; |
| |
| /** |
| * Attributes implementation that (lazily) performs variable substitution. Will be lazily created when needed then |
| * reused. |
| */ |
| private final VariableAttributes variableAttributes; |
| |
| /** |
| * The expander to be used to expand variables in the body text. Null when no expansion should be performed. |
| */ |
| private final VariableExpander bodyTextExpander; |
| |
| /** |
| * Constructs a Substitutor which uses the same VariableExpander for both body text and attibutes. |
| * |
| * @param expander VariableExpander implementation, null if no substitutions are to be performed |
| */ |
| public VariableSubstitutor( final VariableExpander expander ) |
| { |
| this( expander, expander ); |
| } |
| |
| /** |
| * Constructs a Substitutor. |
| * |
| * @param attributesExpander VariableExpander implementation to be used for attributes, null if no attribute |
| * substitutions are to be performed |
| * @param bodyTextExpander VariableExpander implementation to be used for bodyTextExpander, null if no attribute |
| * substitutions are to be performed |
| */ |
| public VariableSubstitutor( final VariableExpander attributesExpander, final VariableExpander bodyTextExpander ) |
| { |
| this.attributesExpander = attributesExpander; |
| this.bodyTextExpander = bodyTextExpander; |
| variableAttributes = new VariableAttributes(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public Attributes substitute( final Attributes attributes ) |
| { |
| Attributes results = attributes; |
| if ( attributesExpander != null ) |
| { |
| variableAttributes.init( attributes, attributesExpander ); |
| results = variableAttributes; |
| } |
| return results; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public String substitute( final String bodyText ) |
| { |
| String result = bodyText; |
| if ( bodyTextExpander != null ) |
| { |
| result = bodyTextExpander.expand( bodyText ); |
| } |
| return result; |
| } |
| |
| } |