| /******************************************************************************* |
| * Copyright (c) 2008 Chase Technology Ltd - http://www.chasetechnology.co.uk and others |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Doug Satchwell (Chase Technology Ltd) - initial API and implementation |
| * David Carver (STAR) - bug 261428 - XPath View not respecting namespaces. |
| *******************************************************************************/ |
| package org.eclipse.wst.xml.xpath.ui.internal.views; |
| |
| import javax.xml.transform.TransformerException; |
| import javax.xml.xpath.XPathExpressionException; |
| |
| import org.eclipse.core.runtime.IProgressMonitor; |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.core.runtime.Status; |
| import org.eclipse.core.runtime.jobs.Job; |
| import org.eclipse.ui.progress.IWorkbenchSiteProgressService; |
| import org.eclipse.wst.sse.core.internal.provisional.IModelStateListener; |
| import org.eclipse.wst.sse.core.internal.provisional.IStructuredModel; |
| import org.eclipse.wst.xml.xpath.core.util.XSLTXPathHelper; |
| import org.eclipse.wst.xml.xpath.ui.internal.Messages; |
| import org.w3c.dom.Document; |
| import org.w3c.dom.Node; |
| import org.w3c.dom.NodeList; |
| |
| public class XPathComputer { |
| private static final int UPDATE_DELAY = 500; |
| private static final byte[] XPATH_LOCK = new byte[0]; |
| private XPathView xpathView; |
| private IModelStateListener modelStateListener = new IModelStateListener() { |
| |
| public void modelAboutToBeChanged(IStructuredModel model) { |
| } |
| |
| public void modelAboutToBeReinitialized(IStructuredModel structuredModel) { |
| } |
| |
| public void modelChanged(IStructuredModel model) { |
| updateXPath(); |
| compute(); |
| } |
| |
| public void modelDirtyStateChanged(IStructuredModel model, |
| boolean isDirty) { |
| } |
| |
| public void modelReinitialized(IStructuredModel structuredModel) { |
| } |
| |
| public void modelResourceDeleted(IStructuredModel model) { |
| } |
| |
| public void modelResourceMoved(IStructuredModel oldModel, |
| IStructuredModel newModel) { |
| } |
| }; |
| private Node node; |
| private IStructuredModel model; |
| private String expression; |
| private String text; |
| private NodeList nodeList; |
| |
| public XPathComputer(XPathView xpathView) { |
| this.xpathView = xpathView; |
| } |
| |
| public void setModel(IStructuredModel model) { |
| if (this.model != null) { |
| this.model.removeModelStateListener(modelStateListener); |
| } |
| this.model = model; |
| if (model != null) { |
| model.addModelStateListener(modelStateListener); |
| updateXPath(); |
| } else { |
| node = null; |
| } |
| } |
| |
| private void updateXPath() { |
| Document doc = (Document) model.getAdapter(Document.class); |
| if (doc == null) { |
| return; |
| } |
| |
| try { |
| updateExpression(); |
| } catch (XPathExpressionException e) { |
| |
| } |
| } |
| |
| private void updateExpression() throws XPathExpressionException { |
| synchronized (XPATH_LOCK) { |
| if (text != null) { |
| XSLTXPathHelper.compile(text); |
| this.expression = text; |
| } else { |
| this.expression = null; |
| } |
| } |
| } |
| |
| public void setText(String text) throws XPathExpressionException { |
| this.text = text; |
| updateExpression(); |
| } |
| |
| public void setSelectedNode(Node node) { |
| this.node = node; |
| } |
| |
| public void compute() { |
| final String[] xps = new String[1]; |
| synchronized (XPATH_LOCK) { |
| xps[0] = expression; |
| } |
| Job refresh = new Job(Messages.XPathComputer_5) { |
| @Override |
| protected IStatus run(IProgressMonitor monitor) { |
| if (xps[0] != expression) { |
| return Status.CANCEL_STATUS; |
| } |
| return doCompute(xps[0]); |
| } |
| }; |
| refresh.setSystem(true); |
| refresh.setPriority(Job.SHORT); |
| IWorkbenchSiteProgressService service = (IWorkbenchSiteProgressService) xpathView |
| .getSite().getService(IWorkbenchSiteProgressService.class); |
| service.schedule(refresh, UPDATE_DELAY); |
| } |
| |
| private IStatus doCompute(String xp) { |
| IStatus status = executeXPath(xp); |
| |
| xpathView.getSite().getShell().getDisplay().asyncExec(new Runnable() { |
| public void run() { |
| xpathView.xpathRecomputed(nodeList); |
| } |
| }); |
| return status; |
| } |
| |
| private IStatus executeXPath(String xp) { |
| try { |
| if ((xp != null) && (node != null)) { |
| synchronized (XPATH_LOCK) { |
| this.nodeList = XSLTXPathHelper.selectNodeList(node, xp); |
| } |
| } |
| } catch (TransformerException e) { |
| return Status.CANCEL_STATUS; |
| } |
| return Status.OK_STATUS; |
| } |
| |
| public void dispose() { |
| if (model != null) { |
| model.removeModelStateListener(modelStateListener); |
| model = null; |
| } |
| } |
| } |