Source Code Cross Referenced for Util.java in  » IDE-Netbeans » project.ant » org » netbeans » modules » project » ant » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE Netbeans » project.ant » org.netbeans.modules.project.ant 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003:         *
004:         * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005:         *
006:         * The contents of this file are subject to the terms of either the GNU
007:         * General Public License Version 2 only ("GPL") or the Common
008:         * Development and Distribution License("CDDL") (collectively, the
009:         * "License"). You may not use this file except in compliance with the
010:         * License. You can obtain a copy of the License at
011:         * http://www.netbeans.org/cddl-gplv2.html
012:         * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
013:         * specific language governing permissions and limitations under the
014:         * License.  When distributing the software, include this License Header
015:         * Notice in each file and include the License file at
016:         * nbbuild/licenses/CDDL-GPL-2-CP.  Sun designates this
017:         * particular file as subject to the "Classpath" exception as provided
018:         * by Sun in the GPL Version 2 section of the License file that
019:         * accompanied this code. If applicable, add the following below the
020:         * License Header, with the fields enclosed by brackets [] replaced by
021:         * your own identifying information:
022:         * "Portions Copyrighted [year] [name of copyright owner]"
023:         *
024:         * Contributor(s):
025:         *
026:         * The Original Software is NetBeans. The Initial Developer of the Original
027:         * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
028:         * Microsystems, Inc. All Rights Reserved.
029:         *
030:         * If you wish your version of this file to be governed by only the CDDL
031:         * or only the GPL Version 2, indicate your decision by adding
032:         * "[Contributor] elects to include this software in this distribution
033:         * under the [CDDL or GPL Version 2] license." If you do not indicate a
034:         * single choice of license, a recipient has the option to distribute
035:         * your version of this file under either the CDDL, the GPL Version 2 or
036:         * to extend the choice of license to its licensees as provided above.
037:         * However, if you add GPL Version 2 code and therefore, elected the GPL
038:         * Version 2 license, then the option applies only if the new code is
039:         * made subject to such option by the copyright holder.
040:         */
041:
042:        package org.netbeans.modules.project.ant;
043:
044:        import java.util.ArrayList;
045:        import java.util.List;
046:        import java.util.logging.Level;
047:        import java.util.logging.Logger;
048:        import org.openide.util.Exceptions;
049:        import org.w3c.dom.Element;
050:        import org.w3c.dom.Node;
051:        import org.w3c.dom.NodeList;
052:        import org.w3c.dom.Text;
053:        import org.xml.sax.ErrorHandler;
054:        import org.xml.sax.SAXException;
055:        import org.xml.sax.SAXParseException;
056:
057:        /**
058:         * Utilities relating to Ant projects.
059:         * @author Jesse Glick
060:         */
061:        public class Util {
062:
063:            private Util() {
064:            }
065:
066:            /**
067:             * Search for an XML element in the direct children of a parent.
068:             * DOM provides a similar method but it does a recursive search
069:             * which we do not want. It also gives a node list and we want
070:             * only one result.
071:             * @param parent a parent element
072:             * @param name the intended local name
073:             * @param namespace the intended namespace
074:             * @return the one child element with that name, or null if none or more than one
075:             */
076:            public static Element findElement(Element parent, String name,
077:                    String namespace) {
078:                Element result = null;
079:                NodeList l = parent.getChildNodes();
080:                int len = l.getLength();
081:                for (int i = 0; i < len; i++) {
082:                    if (l.item(i).getNodeType() == Node.ELEMENT_NODE) {
083:                        Element el = (Element) l.item(i);
084:                        if (name.equals(el.getLocalName())
085:                                && namespace.equals(el.getNamespaceURI())) {
086:                            if (result == null) {
087:                                result = el;
088:                            } else {
089:                                return null;
090:                            }
091:                        }
092:                    }
093:                }
094:                return result;
095:            }
096:
097:            /**
098:             * Extract nested text from an element.
099:             * Currently does not handle coalescing text nodes, CDATA sections, etc.
100:             * @param parent a parent element
101:             * @return the nested text, or null if none was found
102:             */
103:            public static String findText(Element parent) {
104:                NodeList l = parent.getChildNodes();
105:                for (int i = 0; i < l.getLength(); i++) {
106:                    if (l.item(i).getNodeType() == Node.TEXT_NODE) {
107:                        Text text = (Text) l.item(i);
108:                        return text.getNodeValue();
109:                    }
110:                }
111:                return null;
112:            }
113:
114:            /**
115:             * Find all direct child elements of an element.
116:             * More useful than {@link Element#getElementsByTagNameNS} because it does
117:             * not recurse into recursive child elements.
118:             * Children which are all-whitespace text nodes are ignored; others cause
119:             * an exception to be thrown.
120:             * @param parent a parent element in a DOM tree
121:             * @return a list of direct child elements (may be empty)
122:             * @throws IllegalArgumentException if there are non-element children besides whitespace
123:             */
124:            public static List<Element> findSubElements(Element parent)
125:                    throws IllegalArgumentException {
126:                NodeList l = parent.getChildNodes();
127:                List<Element> elements = new ArrayList<Element>(l.getLength());
128:                for (int i = 0; i < l.getLength(); i++) {
129:                    Node n = l.item(i);
130:                    if (n.getNodeType() == Node.ELEMENT_NODE) {
131:                        elements.add((Element) n);
132:                    } else if (n.getNodeType() == Node.TEXT_NODE) {
133:                        String text = ((Text) n).getNodeValue();
134:                        if (text.trim().length() > 0) {
135:                            throw new IllegalArgumentException(
136:                                    "non-ws text encountered in " + parent
137:                                            + ": " + text); // NOI18N
138:                        }
139:                    } else if (n.getNodeType() == Node.COMMENT_NODE) {
140:                        // skip
141:                    } else {
142:                        throw new IllegalArgumentException(
143:                                "unexpected non-element child of " + parent
144:                                        + ": " + n); // NOI18N
145:                    }
146:                }
147:                return elements;
148:            }
149:
150:            /**
151:             * Create an XML error handler that rethrows errors and fatal errors and logs warnings.
152:             * @return a standard error handler
153:             */
154:            public static ErrorHandler defaultErrorHandler() {
155:                return new ErrHandler();
156:            }
157:
158:            private static final class ErrHandler implements  ErrorHandler {
159:
160:                public ErrHandler() {
161:                }
162:
163:                private void annotate(SAXParseException exception)
164:                        throws SAXException {
165:                    Exceptions.attachMessage(exception, "Occurred at: "
166:                            + exception.getSystemId() + ":"
167:                            + exception.getLineNumber()); // NOI18N
168:                }
169:
170:                public void fatalError(SAXParseException exception)
171:                        throws SAXException {
172:                    annotate(exception);
173:                    throw exception;
174:                }
175:
176:                public void error(SAXParseException exception)
177:                        throws SAXException {
178:                    annotate(exception);
179:                    throw exception;
180:                }
181:
182:                public void warning(SAXParseException exception)
183:                        throws SAXException {
184:                    annotate(exception);
185:                    Logger.getLogger(Util.class.getName()).log(Level.INFO,
186:                            null, exception);
187:                }
188:
189:            }
190:
191:        }
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