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
015package org.apache.hivemind.schema.rules;
016
017import org.apache.hivemind.Element;
018import org.apache.hivemind.schema.SchemaProcessor;
019import 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 */
027public 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}