Source Code Cross Referenced for DomUtils.java in  » Search-Engine » compass-2.0 » org » compass » core » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Search Engine » compass 2.0 » org.compass.core.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2004-2006 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.compass.core.util;
018:
019:        import java.util.ArrayList;
020:        import java.util.List;
021:
022:        import org.w3c.dom.*;
023:
024:        /**
025:         * Convenience methods for working with the DOM API,
026:         * in particular for working with DOM Nodes and DOM Elements.
027:         *
028:         * @author kimchy
029:         * @see org.w3c.dom.Node
030:         * @see org.w3c.dom.Element
031:         */
032:        public abstract class DomUtils {
033:
034:            public static String getElementAttribute(Element ele,
035:                    String attributeName) {
036:                return getElementAttribute(ele, attributeName, null);
037:            }
038:
039:            /**
040:             * Gets the attribute value from the element. If the attribute is <code>null</code>
041:             * or is an empty string, will return the defaultValue.
042:             */
043:            public static String getElementAttribute(Element ele,
044:                    String attributeName, String defaultValue) {
045:                String value = ele.getAttribute(attributeName);
046:                if (value == null || !StringUtils.hasText(value)) {
047:                    return defaultValue;
048:                }
049:                return value;
050:            }
051:
052:            public static boolean getElementAttributeAsBoolean(Element ele,
053:                    String attributeName, boolean defaultValue) {
054:                String sValue = getElementAttribute(ele, attributeName);
055:                if (sValue == null) {
056:                    return defaultValue;
057:                }
058:                return Boolean.valueOf(sValue).booleanValue();
059:            }
060:
061:            /**
062:             * Retrieve all child elements of the given DOM element that match
063:             * the given element name. Only look at the direct child level of the
064:             * given element; do not go into further depth (in contrast to the
065:             * DOM API's <code>getElementsByTagName</code> method).
066:             *
067:             * @param ele          the DOM element to analyze
068:             * @param childEleName the child element name to look for
069:             * @return a List of child <code>org.w3c.dom.Element</code> instances
070:             * @see org.w3c.dom.Element
071:             * @see org.w3c.dom.Element#getElementsByTagName
072:             */
073:            public static List getChildElementsByTagName(Element ele,
074:                    String childEleName) {
075:                return getChildElementsByTagName(ele, childEleName, false);
076:            }
077:
078:            /**
079:             * Retrieve all child elements of the given DOM element that match
080:             * the given element name. Only look at the direct child level of the
081:             * given element; do not go into further depth (in contrast to the
082:             * DOM API's <code>getElementsByTagName</code> method).
083:             * <p/>Can select whether or not to compare against the local name of
084:             * the {@link org.w3c.dom.Element}
085:             *
086:             * @param ele          the DOM element to analyze
087:             * @param childEleName the child element name to look for
088:             * @param localName    whether to compare against the local node name
089:             * @return a List of child <code>org.w3c.dom.Element</code> instances
090:             * @see org.w3c.dom.Element
091:             * @see org.w3c.dom.Element#getElementsByTagName
092:             */
093:            public static List getChildElementsByTagName(Element ele,
094:                    String childEleName, boolean localName) {
095:                NodeList nl = ele.getChildNodes();
096:                List childEles = new ArrayList();
097:                for (int i = 0; i < nl.getLength(); i++) {
098:                    Node node = nl.item(i);
099:                    String name = (localName) ? node.getLocalName() : node
100:                            .getNodeName();
101:                    if (node instanceof  Element && childEleName.equals(name)) {
102:                        childEles.add(node);
103:                    }
104:                }
105:                return childEles;
106:            }
107:
108:            /**
109:             * Retruns the trimmed text value of the DOM element.
110:             *
111:             * @see #getTextValue(org.w3c.dom.Element)
112:             */
113:            public static String getTrimmedTextValue(Element valueEle) {
114:                return getTextValue(valueEle).trim();
115:            }
116:
117:            /**
118:             * Extract the text value from the given DOM element, ignoring XML comments.
119:             * <p>Appends all CharacterData nodes and EntityReference nodes
120:             * into a single String value, excluding Comment nodes.
121:             *
122:             * @see org.w3c.dom.CharacterData
123:             * @see org.w3c.dom.EntityReference
124:             * @see org.w3c.dom.Comment
125:             */
126:            public static String getTextValue(Element valueEle) {
127:                StringBuffer value = new StringBuffer();
128:                NodeList nl = valueEle.getChildNodes();
129:                for (int i = 0; i < nl.getLength(); i++) {
130:                    Node item = nl.item(i);
131:                    if ((item instanceof  org.w3c.dom.CharacterData && !(item instanceof  Comment))
132:                            || item instanceof  EntityReference) {
133:                        value.append(item.getNodeValue());
134:                    }
135:                }
136:                return value.toString();
137:            }
138:
139:        }
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