Source Code Cross Referenced for DomUtils.java in  » J2EE » spring-framework-2.5 » org » springframework » util » xml » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.5 » org.springframework.util.xml 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002-2007 the original author or authors.
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package org.springframework.util.xml;
018:
019:        import java.util.ArrayList;
020:        import java.util.List;
021:
022:        import org.w3c.dom.CharacterData;
023:        import org.w3c.dom.Comment;
024:        import org.w3c.dom.Element;
025:        import org.w3c.dom.EntityReference;
026:        import org.w3c.dom.Node;
027:        import org.w3c.dom.NodeList;
028:
029:        import org.springframework.util.Assert;
030:
031:        /**
032:         * Convenience methods for working with the DOM API,
033:         * in particular for working with DOM Nodes and DOM Elements.
034:         *
035:         * @author Juergen Hoeller
036:         * @author Rob Harrop
037:         * @author Costin Leau
038:         * @since 1.2
039:         * @see org.w3c.dom.Node
040:         * @see org.w3c.dom.Element
041:         */
042:        public abstract class DomUtils {
043:
044:            /**
045:             * Retrieve all child elements of the given DOM element that match
046:             * the given element name. Only look at the direct child level of the
047:             * given element; do not go into further depth (in contrast to the
048:             * DOM API's <code>getElementsByTagName</code> method).
049:             * @param ele the DOM element to analyze
050:             * @param childEleName the child element name to look for
051:             * @return a List of child <code>org.w3c.dom.Element</code> instances
052:             * @see org.w3c.dom.Element
053:             * @see org.w3c.dom.Element#getElementsByTagName
054:             */
055:            public static List getChildElementsByTagName(Element ele,
056:                    String childEleName) {
057:                NodeList nl = ele.getChildNodes();
058:                List childEles = new ArrayList();
059:                for (int i = 0; i < nl.getLength(); i++) {
060:                    Node node = nl.item(i);
061:                    if (node instanceof  Element
062:                            && nodeNameEquals(node, childEleName)) {
063:                        childEles.add(node);
064:                    }
065:                }
066:                return childEles;
067:            }
068:
069:            /**
070:             * Utility method that returns the first child element
071:             * identified by its name.
072:             * @param ele the DOM element to analyze
073:             * @param childEleName the child element name to look for
074:             * @return the <code>org.w3c.dom.Element</code> instance,
075:             * or <code>null</code> if none found
076:             */
077:            public static Element getChildElementByTagName(Element ele,
078:                    String childEleName) {
079:                NodeList nl = ele.getChildNodes();
080:                for (int i = 0; i < nl.getLength(); i++) {
081:                    Node node = nl.item(i);
082:                    if (node instanceof  Element
083:                            && nodeNameEquals(node, childEleName)) {
084:                        return (Element) node;
085:                    }
086:                }
087:                return null;
088:            }
089:
090:            /**
091:             * Utility method that returns the first child element value
092:             * identified by its name.
093:             * @param ele the DOM element to analyze
094:             * @param childEleName the child element name to look for
095:             * @return the extracted text value,
096:             * or <code>null</code> if no child element found
097:             */
098:            public static String getChildElementValueByTagName(Element ele,
099:                    String childEleName) {
100:                Element child = getChildElementByTagName(ele, childEleName);
101:                return (child != null ? getTextValue(child) : null);
102:            }
103:
104:            /**
105:             * Namespace-aware equals comparison. Returns <code>true</code> if either
106:             * {@link Node#getLocalName} or {@link Node#getNodeName} equals <code>desiredName</code>,
107:             * otherwise returns <code>false</code>.
108:             */
109:            public static boolean nodeNameEquals(Node node, String desiredName) {
110:                Assert.notNull(node, "Node must not be null");
111:                Assert.notNull(desiredName, "Desired name must not be null");
112:                return (desiredName.equals(node.getNodeName()) || desiredName
113:                        .equals(node.getLocalName()));
114:            }
115:
116:            /**
117:             * Extract the text value from the given DOM element, ignoring XML comments.
118:             * <p>Appends all CharacterData nodes and EntityReference nodes
119:             * into a single String value, excluding Comment nodes.
120:             * @see CharacterData
121:             * @see EntityReference
122:             * @see Comment
123:             */
124:            public static String getTextValue(Element valueEle) {
125:                StringBuffer value = new StringBuffer();
126:                NodeList nl = valueEle.getChildNodes();
127:                for (int i = 0; i < nl.getLength(); i++) {
128:                    Node item = nl.item(i);
129:                    if ((item instanceof  CharacterData && !(item instanceof  Comment))
130:                            || item instanceof  EntityReference) {
131:                        value.append(item.getNodeValue());
132:                    }
133:                }
134:                return value.toString();
135:            }
136:
137:        }
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