001    // Copyright 2004, 2005 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.hivemind.schema.rules;
016    
017    import org.apache.hivemind.Element;
018    import org.apache.hivemind.schema.SchemaProcessor;
019    import org.apache.hivemind.schema.Translator;
020    
021    /**
022     * A rule that reads an attribute, passes it through a translator, then pushes the result onto the
023     * processor stack.
024     * 
025     * @author Howard Lewis Ship
026     */
027    public class PushAttributeRule extends BaseRule
028    {
029        private String _attributeName;
030    
031        /**
032         * Uses the translator to convert the specified attribute into an object and pushes that object
033         * onto the processor stack.
034         */
035        public void begin(SchemaProcessor processor, Element element)
036        {
037            Translator t = processor.getAttributeTranslator(_attributeName);
038    
039            String attributeValue = element.getAttributeValue(_attributeName);
040            String value = RuleUtils.processText(processor, element, attributeValue);
041    
042            Object finalValue = t.translate(
043                    processor.getContributingModule(),
044                    Object.class,
045                    value,
046                    element.getLocation());
047    
048            processor.push(finalValue);
049        }
050    
051        /**
052         * Invokes {@link SchemaProcessor#pop()}.
053         */
054        public void end(SchemaProcessor processor, Element element)
055        {
056            processor.pop();
057        }
058    
059        public void setAttributeName(String string)
060        {
061            _attributeName = string;
062        }
063    
064        public String getAttributeName()
065        {
066            return _attributeName;
067        }
068    
069    }