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.commons.logging.Log;
018import org.apache.commons.logging.LogFactory;
019import org.apache.hivemind.Element;
020import org.apache.hivemind.ErrorHandler;
021import org.apache.hivemind.schema.SchemaProcessor;
022import org.apache.hivemind.schema.Translator;
023import org.apache.hivemind.util.PropertyUtils;
024
025/**
026 * Used to set a property of the top object on the stack to the value
027 * of the element's content.  Created from the <code>&lt;read-content&gt;</code>
028 * element.
029 * 
030 * <p>
031 * Note: an {@link org.apache.hivemind.Element}'s content is trimmed
032 * of leading and trailing whitespace as it is parsed and, additionally,
033 * will never be null (though it may be the empty string).
034 *
035 * @author Howard Lewis Ship
036 */
037public class ReadContentRule extends BaseRule
038{
039    private static final Log LOG = LogFactory.getLog(ReadContentRule.class);
040
041    private String _propertyName;
042
043    public void begin(SchemaProcessor processor, Element element)
044    {
045        String value = RuleUtils.processText(processor, element, element.getContent());
046
047        try
048        {
049            Translator t = processor.getContentTranslator();
050
051            Object target = processor.peek();
052
053            Class propertyType = PropertyUtils.getPropertyType(target, _propertyName);
054
055            Object finalValue =
056                t.translate(
057                    processor.getContributingModule(),
058                    propertyType,
059                    value,
060                    element.getLocation());
061
062            PropertyUtils.write(target, _propertyName, finalValue);
063        }
064        catch (Exception ex)
065        {
066            ErrorHandler eh = processor.getContributingModule().getErrorHandler();
067
068            eh.error(
069                LOG,
070                RulesMessages.readContentFailure(processor, element, ex),
071                element.getLocation(),
072                ex);
073        }
074
075    }
076
077    public String getPropertyName()
078    {
079        return _propertyName;
080    }
081
082    public void setPropertyName(String string)
083    {
084        _propertyName = string;
085    }
086
087}