Source Code Cross Referenced for XPathHelper.java in  » Ajax » Laszlo-4.0.10 » org » openlaszlo » iv » flash » xml » apache » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Ajax » Laszlo 4.0.10 » org.openlaszlo.iv.flash.xml.apache 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $Id: XPathHelper.java,v 1.5 2002/07/18 06:02:22 skavish Exp $
003:         *
004:         * ===========================================================================
005:         *
006:         * The JGenerator Software License, Version 1.0
007:         *
008:         * Copyright (c) 2000 Dmitry Skavish (skavish@usa.net). All rights reserved.
009:         *
010:         * Redistribution and use in source and binary forms, with or without
011:         * modification, are permitted provided that the following conditions are met:
012:         *
013:         * 1. Redistributions of source code must retain the above copyright
014:         *    notice, this list of conditions and the following disclaimer.
015:         *
016:         * 2. Redistributions in binary form must reproduce the above copyright
017:         *    notice, this list of conditions and the following disclaimer in
018:         *    the documentation and/or other materials provided with the
019:         *    distribution.
020:         *
021:         * 3. The end-user documentation included with the redistribution, if
022:         *    any, must include the following acknowlegement:
023:         *    "This product includes software developed by Dmitry Skavish
024:         *     (skavish@usa.net, http://www.flashgap.com/)."
025:         *    Alternately, this acknowlegement may appear in the software itself,
026:         *    if and wherever such third-party acknowlegements normally appear.
027:         *
028:         * 4. The name "The JGenerator" must not be used to endorse or promote
029:         *    products derived from this software without prior written permission.
030:         *    For written permission, please contact skavish@usa.net.
031:         *
032:         * 5. Products derived from this software may not be called "The JGenerator"
033:         *    nor may "The JGenerator" appear in their names without prior written
034:         *    permission of Dmitry Skavish.
035:         *
036:         * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
037:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
038:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
039:         * DISCLAIMED.  IN NO EVENT SHALL DMITRY SKAVISH OR THE OTHER
040:         * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
041:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
042:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
043:         * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
044:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
045:         * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
046:         * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
047:         * SUCH DAMAGE.
048:         *
049:         */
050:
051:        package org.openlaszlo.iv.flash.xml.apache;
052:
053:        import java.io.*;
054:        import java.net.*;
055:        import java.util.*;
056:
057:        import java.io.FileInputStream;
058:        import java.io.FileNotFoundException;
059:        import java.util.Properties;
060:
061:        import org.apache.xerces.parsers.DOMParser;
062:        import org.apache.xpath.*;
063:        import org.apache.xml.utils.*;
064:        import org.apache.xpath.objects.*;
065:        import org.w3c.dom.*;
066:        import org.w3c.dom.traversal.*;
067:        import org.xml.sax.SAXException;
068:        import org.xml.sax.InputSource;
069:
070:        import javax.xml.parsers.*;
071:        import javax.xml.transform.*;
072:
073:        import org.openlaszlo.iv.flash.api.*;
074:        import org.openlaszlo.iv.flash.url.*;
075:
076:        import org.openlaszlo.iv.flash.cache.*;
077:
078:        import org.xml.sax.EntityResolver;
079:        import org.xml.sax.InputSource;
080:
081:        /**
082:         * XML Helper class for apache implementation
083:         * <P>
084:         * Provides various methods for XML stuff
085:         *
086:         * @author Dmitry Skavish
087:         */
088:        public class XPathHelper {
089:
090:            private static Hashtable xpaths = new Hashtable();
091:            private static Hashtable prefix_resolvers = new Hashtable();
092:
093:            public synchronized static PrefixResolver getPrefixResolver(
094:                    Node node) {
095:                if (prefix_resolvers.size() > 300)
096:                    prefix_resolvers.clear();
097:
098:                PrefixResolver pr = (PrefixResolver) prefix_resolvers.get(node);
099:                if (pr == null) {
100:                    // Create an object to resolve namespace prefixes.
101:                    // XPath namespaces are resolved from the input context node's document element
102:                    // if it is a root node, or else the current context node (for lack of a better
103:                    // resolution space, given the simplicity of this sample code).
104:                    pr = new PrefixResolverDefault(
105:                            (node.getNodeType() == Node.DOCUMENT_NODE) ? ((Document) node)
106:                                    .getDocumentElement()
107:                                    : node);
108:                    prefix_resolvers.put(node, pr);
109:                }
110:
111:                return pr;
112:            }
113:
114:            /**
115:             * Compiles specified string into XPath.
116:             * <P>
117:             * Tries to retrieve compiled XPath expression from cache,
118:             * if it's not in the cache then compiles give string into XPath
119:             * and caches in the cache.
120:             *
121:             * @param expr   string representing XPath expression
122:             * @return compiled XPath expression
123:             * @exception TransformerException
124:             */
125:            public synchronized static XPath getXPath(Node node, String expr)
126:                    throws TransformerException {
127:                if (xpaths.size() > 300)
128:                    xpaths.clear();
129:
130:                XPath xpath = (XPath) xpaths.get(expr);
131:                if (xpath == null) {
132:                    xpath = new XPath(expr, null, getPrefixResolver(node),
133:                            XPath.SELECT, null);
134:                    xpaths.put(expr, xpath);
135:                }
136:                return xpath;
137:            }
138:
139:            /**
140:             * Evaluates specified XPath expression in the specified xml node.
141:             *
142:             * @param xpathContext
143:             * @param node   xml node to evaluated on
144:             * @param expr   xpath expression
145:             * @return result of xpath execution
146:             * @exception TransformerException
147:             */
148:            public static XObject evalXPath(XPathContext xpathContext,
149:                    Node node, String expr) throws TransformerException {
150:                return evalXPath(xpathContext, node, getXPath(node, expr));
151:            }
152:
153:            /**
154:             * Evaluates specified XPath expression in the specified xml node.
155:             *
156:             * @param xpathContext
157:             * @param node   xml node to evaluated on
158:             * @param xpath  xpath expression
159:             * @return result of xpath execution
160:             * @exception TransformerException
161:             */
162:            public static XObject evalXPath(XPathContext xpathContext,
163:                    Node node, XPath xpath) throws TransformerException {
164:                // Execute the XPath, and have it return the result
165:                // return xpath.execute(xpathSupport, contextNode, prefixResolver);
166:                int ctxtNode = xpathContext.getDTMHandleFromNode(node);
167:
168:                return xpath.execute(xpathContext, ctxtNode,
169:                        getPrefixResolver(node));
170:            }
171:
172:            /**
173:             * Evaluates XPath to list of nodes.
174:             *
175:             * @param xpathContext
176:             * @param node   xml node to evaluated on
177:             * @param expr   XPath expression
178:             * @return result of xpath execution - list of nodes
179:             * @exception TransformerException
180:             */
181:            public static NodeList selectNodeList(XPathContext xpathContext,
182:                    Node node, String expr) throws TransformerException {
183:                return getNodeList(evalXPath(xpathContext, node, expr));
184:            }
185:
186:            /**
187:             * Evaluates XPath to list of nodes.
188:             *
189:             * @param xpathContext
190:             * @param node   xml node to evaluated on
191:             * @param xpath  XPath expression
192:             * @return result of xpath execution - list of nodes
193:             * @exception TransformerException
194:             */
195:            public static NodeList selectNodeList(XPathContext xpathContext,
196:                    Node node, XPath xpath) throws TransformerException {
197:                return getNodeList(evalXPath(xpathContext, node, xpath));
198:            }
199:
200:            /**
201:             * Evaluates XPath to one node.
202:             *
203:             * @param xpathContext
204:             * @param node   xml node to be evaluated on
205:             * @param expr   XPath expression
206:             * @return xml node
207:             * @exception TransformerException
208:             */
209:            public static Node selectSingleNode(XPathContext xpathContext,
210:                    Node node, String expr) throws TransformerException {
211:                NodeList nl = selectNodeList(xpathContext, node, expr);
212:                if (nl.getLength() > 0)
213:                    return nl.item(0);
214:                return null;
215:            }
216:
217:            /**
218:             * Evaluates XPath to one node.
219:             *
220:             * @param xpathContext
221:             * @param node   xml node to be evaluated on
222:             * @param xpath   XPath expression
223:             * @return xml node
224:             * @exception TransformerException
225:             */
226:            public static Node selectSingleNode(XPathContext xpathContext,
227:                    Node node, XPath xpath) throws TransformerException {
228:                NodeList nl = selectNodeList(xpathContext, node, xpath);
229:                if (nl.getLength() > 0)
230:                    return nl.item(0);
231:                return null;
232:            }
233:
234:            /**
235:             * Converts result of XPath evaluation to nodelist.
236:             *
237:             * @param xo     result of xpath evaluation
238:             * @return nodelist
239:             * @exception TransformerException
240:             */
241:            public static NodeList getNodeList(XObject xo)
242:                    throws TransformerException {
243:                return xo.nodelist();
244:            }
245:
246:            /**
247:             * Returns String representation of specified xml node.
248:             *
249:             * @param node   the specified xml node
250:             * @return string representation of the node
251:             */
252:            public static String getNodeData(Node node) {
253:                switch (node.getNodeType()) {
254:                case Node.DOCUMENT_FRAGMENT_NODE:
255:                case Node.DOCUMENT_NODE:
256:                case Node.ELEMENT_NODE: {
257:                    /*for (Node child = node.getFirstChild(); null != child;
258:                          child = child.getNextSibling())*/
259:                    Node child = node.getFirstChild();
260:                    if (child != null)
261:                        return getNodeData(child);
262:                }
263:                    break;
264:                case Node.TEXT_NODE:
265:                case Node.CDATA_SECTION_NODE:
266:                    return node.getNodeValue();
267:                case Node.ATTRIBUTE_NODE:
268:                    return node.getNodeValue();
269:                case Node.PROCESSING_INSTRUCTION_NODE:
270:                    break;
271:                default:
272:                    break;
273:                }
274:                return "";
275:            }
276:
277:            public static String getXObjectData(XObject xo) {
278:                switch (xo.getType()) {
279:                case XObject.CLASS_UNKNOWN:
280:                    return null;
281:                case XObject.CLASS_BOOLEAN:
282:                case XObject.CLASS_STRING:
283:                case XObject.CLASS_NULL:
284:                case XObject.CLASS_NUMBER:
285:                case XObject.CLASS_UNRESOLVEDVARIABLE:
286:                case XObject.CLASS_RTREEFRAG:
287:                    return xo.toString();
288:                    //break;
289:                case XObject.CLASS_NODESET:
290:                    try {
291:                        NodeList nl = xo.nodelist();
292:                        StringBuffer sb = new StringBuffer();
293:                        int l = nl.getLength();
294:                        if (l == 0)
295:                            return null;
296:                        for (int i = 0; i < l; i++) {
297:                            Node node = nl.item(i);
298:                            sb.append(getNodeData(node));
299:                        }
300:                        return sb.toString();
301:                    } catch (javax.xml.transform.TransformerException e) {
302:                    }
303:                }
304:                return null;
305:                //return xo.toString();
306:            }
307:
308:            public static void getNodeData(Node node, StringBuffer buf) {
309:                switch (node.getNodeType()) {
310:                case Node.DOCUMENT_FRAGMENT_NODE:
311:                case Node.DOCUMENT_NODE:
312:                case Node.ELEMENT_NODE: {
313:                    for (Node child = node.getFirstChild(); null != child; child = child
314:                            .getNextSibling()) {
315:                        buf.append('<');
316:                        buf.append(node.getNodeName());
317:                        buf.append('>');
318:                        getNodeData(child, buf);
319:                        buf.append("</");
320:                        buf.append(node.getNodeName());
321:                        buf.append('>');
322:                    }
323:                }
324:                    break;
325:                case Node.TEXT_NODE:
326:                case Node.CDATA_SECTION_NODE:
327:                    buf.append(node.getNodeValue());
328:                    break;
329:                case Node.ATTRIBUTE_NODE:
330:                    buf.append(node.getNodeValue());
331:                    break;
332:                case Node.PROCESSING_INSTRUCTION_NODE:
333:                    // warning(XPATHErrorResources.WG_PARSING_AND_PREPARING);
334:                    break;
335:                default:
336:                    // ignore
337:                    break;
338:                }
339:            }
340:        }
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