Source Code Cross Referenced for TextRule.java in  » Library » Apache-commons-betwixt-0.8-src » org » apache » commons » betwixt » digester » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Apache commons betwixt 0.8 src » org.apache.commons.betwixt.digester 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.apache.commons.betwixt.digester;
002:
003:        /*
004:         * Licensed to the Apache Software Foundation (ASF) under one or more
005:         * contributor license agreements.  See the NOTICE file distributed with
006:         * this work for additional information regarding copyright ownership.
007:         * The ASF licenses this file to You under the Apache License, Version 2.0
008:         * (the "License"); you may not use this file except in compliance with
009:         * the License.  You may obtain a copy of the License at
010:         * 
011:         *      http://www.apache.org/licenses/LICENSE-2.0
012:         * 
013:         * Unless required by applicable law or agreed to in writing, software
014:         * distributed under the License is distributed on an "AS IS" BASIS,
015:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016:         * See the License for the specific language governing permissions and
017:         * limitations under the License.
018:         */
019:
020:        import java.beans.PropertyDescriptor;
021:        import java.lang.reflect.Method;
022:
023:        import org.apache.commons.betwixt.ElementDescriptor;
024:        import org.apache.commons.betwixt.TextDescriptor;
025:        import org.apache.commons.betwixt.XMLBeanInfo;
026:        import org.apache.commons.betwixt.expression.ConstantExpression;
027:        import org.apache.commons.betwixt.expression.MethodExpression;
028:        import org.apache.commons.betwixt.expression.MethodUpdater;
029:        import org.apache.commons.logging.Log;
030:        import org.apache.commons.logging.LogFactory;
031:        import org.xml.sax.Attributes;
032:        import org.xml.sax.SAXException;
033:
034:        /** 
035:         * <p>Rule for parsing &lt;text&gt; elements.
036:         * These allow mixed content text to be specified.
037:         * A mixed content element example:
038:         * <pre>
039:         *     &lt;foo&gt;text&lt;bar/&gt;&lt;/foo&gt;
040:         * </pre>
041:         * </p>
042:         *
043:         * @author Robert Burrell Donkin
044:         * @version $Id: TextRule.java 438373 2006-08-30 05:17:21Z bayard $
045:         */
046:        public class TextRule extends MappedPropertyRule {
047:
048:            /** Logger */
049:            private static final Log log = LogFactory.getLog(TextRule.class);
050:
051:            /** Base constructor */
052:            public TextRule() {
053:            }
054:
055:            // Rule interface
056:            //-------------------------------------------------------------------------    
057:
058:            /**
059:             * Process the beginning of this element.
060:             *
061:             * @param attributes The attribute list of this element
062:             * @throws SAXException 1. If this tag's parent is not an element tag.
063:             * 2. If this tag has a value attribute together with either a property
064:             * or type attribute.
065:             */
066:            public void begin(String name, String namespace,
067:                    Attributes attributes) throws SAXException {
068:
069:                TextDescriptor descriptor = new TextDescriptor();
070:
071:                String value = attributes.getValue("value");
072:                String propertyName = attributes.getValue("property");
073:                String propertyType = attributes.getValue("type");
074:
075:                if (value != null) {
076:                    if (propertyName != null || propertyType != null) {
077:                        // not allowed
078:                        throw new SAXException(
079:                                "You cannot specify attribute 'value' together with either "
080:                                        + " the 'property' or 'type' attributes");
081:                    }
082:                    // fixed value text
083:                    descriptor.setTextExpression(new ConstantExpression(value));
084:
085:                } else {
086:                    // property based text
087:                    descriptor.setPropertyName(propertyName);
088:
089:                    Class beanClass = getBeanClass();
090:
091:                    // set the property type using reflection
092:                    descriptor.setPropertyType(getPropertyType(propertyType,
093:                            beanClass, propertyName));
094:
095:                    if (beanClass != null) {
096:                        String descriptorPropertyName = descriptor
097:                                .getPropertyName();
098:                        PropertyDescriptor propertyDescriptor = getPropertyDescriptor(
099:                                beanClass, descriptorPropertyName);
100:                        if (propertyDescriptor != null) {
101:                            Method readMethod = propertyDescriptor
102:                                    .getReadMethod();
103:                            descriptor.setTextExpression(new MethodExpression(
104:                                    readMethod));
105:                            Method writeMethod = propertyDescriptor
106:                                    .getWriteMethod();
107:                            if (writeMethod != null) {
108:                                descriptor.setUpdater(new MethodUpdater(
109:                                        writeMethod));
110:                            }
111:                            getProcessedPropertyNameSet().add(
112:                                    descriptorPropertyName);
113:                        }
114:                    }
115:                }
116:
117:                Object top = digester.peek();
118:                if (top instanceof  XMLBeanInfo) {
119:                    XMLBeanInfo beanInfo = (XMLBeanInfo) top;
120:                    ElementDescriptor elementDescriptor = beanInfo
121:                            .getElementDescriptor();
122:                    if (elementDescriptor != null) {
123:                        elementDescriptor.addContentDescriptor(descriptor);
124:                    }
125:
126:                } else if (top instanceof  ElementDescriptor) {
127:                    ElementDescriptor parent = (ElementDescriptor) top;
128:                    parent.addContentDescriptor(descriptor);
129:
130:                } else {
131:                    throw new SAXException("Invalid use of <text>. It should "
132:                            + "be nested <text> nodes");
133:                }
134:            }
135:        }
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