Source Code Cross Referenced for XPath.java in  » J2EE » enhydra » demo » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » enhydra » demo 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package demo;
002:
003:        import java.util.Iterator;
004:        import java.io.OutputStreamWriter;
005:        import java.io.PrintWriter;
006:
007:        import org.w3c.dom.Node;
008:        import org.w3c.dom.NodeList;
009:        import org.w3c.dom.NamedNodeMap;
010:
011:        import org.apache.commons.jxpath.JXPathContext;
012:        import org.apache.commons.jxpath.Pointer;
013:
014:        import org.jaxen.XPathSyntaxException;
015:        import org.jaxen.JaxenException;
016:        import org.jaxen.dom.html.HTMLXPath;
017:
018:        import org.enhydra.xml.xmlc.StreamXMLCLogger;
019:        import org.enhydra.xml.xmlc.XMLObject;
020:        import org.enhydra.xml.xmlc.StreamXMLCLogger;
021:        import org.enhydra.xml.xmlc.deferredparsing.XMLCDeferredParsingFactory;
022:
023:        public class XPath {
024:            public static final int XPATH_IMPL_JAXEN = 0;
025:            public static final int XPATH_IMPL_JXPATH = 1;
026:
027:            static private XMLCDeferredParsingFactory xmlcFactory = null;
028:
029:            protected XMLCDeferredParsingFactory getFactory() {
030:                if (xmlcFactory != null) {
031:                    return xmlcFactory;
032:                }
033:
034:                PrintWriter writer = new PrintWriter(new OutputStreamWriter(
035:                        System.err));
036:                StreamXMLCLogger logger = new StreamXMLCLogger(writer, writer,
037:                        writer);
038:                xmlcFactory = new XMLCDeferredParsingFactory(null, this 
039:                        .getClass().getClassLoader(), null);
040:                xmlcFactory.addResourceDir(".");
041:                xmlcFactory.addResourceDir("./input");
042:                xmlcFactory.addResourceDir("./build/src");
043:                xmlcFactory.addPackagePrefix("demo");
044:
045:                xmlcFactory.setDefaultMetaDataPath("input/options.xmlc");
046:                return xmlcFactory;
047:            }
048:
049:            public Iterator query(XMLObject xmlObject, String query,
050:                    int xpathImpl) {
051:                /* create an Iterator to hold the results of the query */
052:                Iterator iter = new java.util.ArrayList().iterator(); //guarantee default non-null Iterator
053:                switch (xpathImpl) {
054:                case XPATH_IMPL_JAXEN:
055:                    try {
056:                        org.jaxen.XPath xpath = new HTMLXPath(query, true);
057:                        iter = xpath.selectNodes((Node) xmlObject).iterator();
058:                    } catch (XPathSyntaxException xse) {
059:                        System.err.println(xse.getMultilineMessage());
060:                    } catch (JaxenException je) {
061:                        je.printStackTrace();
062:                    } catch (Exception e) {
063:                        e.printStackTrace();
064:                    }
065:                    break;
066:                case XPATH_IMPL_JXPATH:
067:                    JXPathContext context = JXPathContext.newContext(xmlObject);
068:                    iter = context.iteratePointers(query);
069:                    break;
070:                }
071:                return iter;
072:            }
073:
074:            public Iterator query(String file, String query, int xpathImpl) {
075:                /* loading the document with dyanmic loading */
076:                XMLObject xmlObject = getFactory().createFromFile(file);
077:                return query(xmlObject, query, xpathImpl);
078:            }
079:
080:            public static void main(String[] args) {
081:                System.out.println("\nJXPath Result...");
082:                JXPathMain(args);
083:                System.out.println("\nJaxen Result...");
084:                JaxenMain(args);
085:            }
086:
087:            public static void JXPathMain(String[] args) {
088:                if (args.length == 2) {
089:                    XPath xpath = new XPath();
090:                    int count = 0;
091:                    for (Iterator iter = xpath.query(args[0], args[1],
092:                            XPATH_IMPL_JXPATH); iter.hasNext(); count++) {
093:                        Pointer pointer = (Pointer) iter.next();
094:                        Node node = (Node) pointer.getNode();
095:                        String nodeValue = node.getNodeValue();
096:                        if (nodeValue == null) {
097:                            NodeTreeGenerator ntgen = new NodeTreeGenerator();
098:                            ntgen.setDoIndent(true);
099:                            ntgen.makeNodeTree(node);
100:                            nodeValue = ntgen.getNodeTree();
101:                        }
102:                        //System.out.println ("Result " + count + " --- " + pointer.getNode().getClass() + " value:\n" + pointer.getValue());
103:                        System.out.println("Result " + count + " --- "
104:                                + node.getClass() + " value:\n" + nodeValue);
105:                    }
106:                } else {
107:                    System.out.println("xpath file query");
108:                }
109:            }
110:
111:            public static void JaxenMain(String[] args) {
112:                if (args.length == 2) {
113:                    XPath xpath = new XPath();
114:                    int count = 0;
115:                    for (Iterator iter = xpath.query(args[0], args[1],
116:                            XPATH_IMPL_JAXEN); iter.hasNext(); count++) {
117:                        Node node = (Node) iter.next();
118:                        String nodeValue = node.getNodeValue();
119:                        if (nodeValue == null) {
120:                            NodeTreeGenerator ntgen = new NodeTreeGenerator();
121:                            ntgen.setDoIndent(true);
122:                            ntgen.makeNodeTree(node);
123:                            nodeValue = ntgen.getNodeTree();
124:                        }
125:                        System.out.println("Result " + count + " --- "
126:                                + node.getClass() + " value:\n" + nodeValue);
127:                    }
128:                } else {
129:                    System.out.println("xpath file query");
130:                }
131:            }
132:
133:            public static class NodeTreeGenerator {
134:
135:                // a counter for keeping track of the "tabs"
136:                private int tabCounter = 1;
137:                private StringBuffer nodeTreeBuffer;
138:                private boolean doIndent = true;
139:
140:                public NodeTreeGenerator() {
141:                    nodeTreeBuffer = new StringBuffer(200);
142:                }
143:
144:                public void setDoIndent(boolean idoIndent) {
145:                    this .doIndent = idoIndent;
146:                }
147:
148:                public String getNodeTree() {
149:                    return this .nodeTreeBuffer.toString();
150:                }
151:
152:                // this is a recursive function to traverse the document tree
153:                private void makeNodeTree(Node node) {
154:                    String content = "";
155:                    int type = node.getNodeType();
156:
157:                    // check if element
158:                    if (type == Node.ELEMENT_NODE) {
159:                        formatTree(tabCounter);
160:                        nodeTreeBuffer.append("Elt: ").append(
161:                                node.getNodeName()).append("\n");
162:
163:                        // check if the element has any attributes
164:                        if (node.hasAttributes()) {
165:                            // if it does, store it in a NamedNodeMap object
166:                            NamedNodeMap attributesList = node.getAttributes();
167:
168:                            // iterate through the NamedNodeMap and get the attribute names and values
169:                            for (int j = 0; j < attributesList.getLength(); j++) {
170:                                formatTree(tabCounter);
171:                                nodeTreeBuffer.append("Attr: ").append(
172:                                        attributesList.item(j).getNodeName())
173:                                        .append(" = ").append(
174:                                                attributesList.item(j)
175:                                                        .getNodeValue())
176:                                        .append("\n");
177:                            }
178:                        }
179:                    } else if (type == Node.TEXT_NODE) {
180:                        // check if text node and print value
181:                        content = node.getNodeValue();
182:                        if (!content.trim().equals("")) {
183:                            formatTree(tabCounter);
184:                            nodeTreeBuffer.append("Txt: ").append(content)
185:                                    .append("\n");
186:                        }
187:                    } else if (type == Node.COMMENT_NODE) {
188:                        // check if comment node and print value
189:                        content = node.getNodeValue();
190:                        if (!content.trim().equals("")) {
191:                            formatTree(tabCounter);
192:                            nodeTreeBuffer.append("Cmnt: ").append(content)
193:                                    .append("\n");
194:                        }
195:                    }
196:
197:                    // check if current node has any children
198:                    if (node.hasChildNodes()) {
199:                        // if it does, iterate through the collection
200:                        NodeList children = node.getChildNodes();
201:                        for (int i = 0; i < children.getLength(); i++) {
202:                            tabCounter++;
203:                            // recursively call function to proceed to next level
204:                            makeNodeTree(children.item(i));
205:                            tabCounter--;
206:                        }
207:                    }
208:                }
209:
210:                // this formats the output for the generated tree
211:                private void formatTree(int tabCounter) {
212:                    if (this .doIndent) {
213:                        for (int j = 1; j < tabCounter; j++) {
214:                            nodeTreeBuffer.append("  ");
215:                        }
216:                    }
217:                }
218:            }
219:
220:        }
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