Mercurial > repos > ganjoo > webservice_toolsuite
view WebServiceToolWorkflow/lib/SAWADLParser/src/edu/uga/cs/lsdis/meteors/wadls/util/xml/XPathUtils.java @ 0:d5cd409b8a18 default tip
Migrated tool version 1.0.0 from old tool shed archive to new tool shed repository
author | ganjoo |
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date | Tue, 07 Jun 2011 18:00:50 -0400 |
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/* * (c) Copyright IBM Corp 2001, 2005 */ package edu.uga.cs.lsdis.meteors.wadls.util.xml; import java.util.Vector; import org.w3c.dom.*; /** * A <code>XPathUtils</code> ... * * @author Matthew J. Duftler (duftler@us.ibm.com) * @author Sanjiva Weerawarana (sanjiva@watson.ibm.com) */ public class XPathUtils { private static Node getPreviousTypedNode(Node node, short nodeType) { node = node.getPreviousSibling(); while (node != null && node.getNodeType() != nodeType) { node = node.getPreviousSibling(); } return node; } private static Node getNextTypedNode(Node node, short nodeType) { node = node.getNextSibling(); while (node != null && node.getNodeType() != nodeType) { node = node.getNextSibling(); } return node; } private static String getValue(Node node, short nodeType) { switch (nodeType) { case Node.ELEMENT_NODE : return ((Element)node).getTagName(); case Node.TEXT_NODE : return ((Text)node).getData(); case Node.PROCESSING_INSTRUCTION_NODE : return ((ProcessingInstruction)node).getData(); default : return ""; } } private static short getNodeType(Node node) { return (node != null ? node.getNodeType() : -1); } private static String getXPathFromVector(Vector path) { StringBuffer strBuf = new StringBuffer(); int length = path.size(); for (int i = 0; i < length; i++) { Node tempNode = (Node)path.elementAt(i); short nodeType = getNodeType(tempNode); String targetValue = getValue(tempNode, nodeType); int position = 1; tempNode = getPreviousTypedNode(tempNode, nodeType); while (tempNode != null) { if (nodeType == Node.ELEMENT_NODE) { if (getValue(tempNode, nodeType).equals(targetValue)) { position++; } } else { position++; } tempNode = getPreviousTypedNode(tempNode, nodeType); } boolean hasMatchingSiblings = (position > 1); if (!hasMatchingSiblings) { tempNode = (Node)path.elementAt(i); tempNode = getNextTypedNode(tempNode, nodeType); while (!hasMatchingSiblings && tempNode != null) { if (nodeType == Node.ELEMENT_NODE) { if (getValue(tempNode, nodeType).equals(targetValue)) { hasMatchingSiblings = true; } else { tempNode = getNextTypedNode(tempNode, nodeType); } } else { hasMatchingSiblings = true; } } } String step; switch (nodeType) { case Node.TEXT_NODE : step = "text()"; break; case Node.PROCESSING_INSTRUCTION_NODE : step = "processing-instruction()"; break; default : step = targetValue; break; } if (step != null && step.length() > 0) { strBuf.append('/' + step); } if (hasMatchingSiblings) { strBuf.append("[" + position + "]"); } } return strBuf.toString(); } private static Vector getVectorPathFromNode(Node node) { Vector path = new Vector(); while (node != null) { path.insertElementAt(node, 0); node = node.getParentNode(); } return path; } /** * Generates an XPath expression that will return only the given node as its * result. This method only works for element, text, document and PI nodes. * * @param node the node to generate an XPath expression for. This node must * be an element node, a text node, a document node, or a processing * instruction node. * @return an XPath expression that will return only the given node as its * result. * @exception IllegalArgumentException if the given node is not an element, * text, document or PI node. */ public static String getXPathExprFromNode(Node node) throws IllegalArgumentException { short nodeType = getNodeType(node); switch (nodeType) { case Node.ELEMENT_NODE : case Node.TEXT_NODE : case Node.PROCESSING_INSTRUCTION_NODE : return getXPathFromVector(getVectorPathFromNode(node)); case Node.DOCUMENT_NODE : return "/"; default : throw new IllegalArgumentException("Only works for element, text, " + "document, and PI nodes."); } } }