| /******************************************************************************* |
| * Copyright (c) 2006 Sybase, Inc. 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: |
| * Sybase, Inc. - initial API and implementation |
| * Oracle - move to pluggable EL resolving |
| *******************************************************************************/ |
| package org.eclipse.jst.pagedesigner.preview; |
| |
| import java.io.BufferedInputStream; |
| import java.io.InputStream; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Properties; |
| |
| import javax.servlet.jsp.el.ELException; |
| |
| import org.eclipse.core.resources.IProject; |
| import org.eclipse.core.resources.IStorage; |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.IConfigurationElement; |
| import org.eclipse.core.runtime.IExtension; |
| import org.eclipse.core.runtime.IExtensionPoint; |
| import org.eclipse.core.runtime.Platform; |
| import org.eclipse.jst.jsf.common.ui.internal.logging.Logger; |
| import org.eclipse.jst.jsf.common.ui.internal.utils.ResourceUtils; |
| import org.eclipse.jst.jsf.core.internal.tld.LoadBundleUtil; |
| import org.eclipse.jst.pagedesigner.IJMTConstants; |
| import org.eclipse.jst.pagedesigner.PDPlugin; |
| import org.eclipse.jst.pagedesigner.jsp.core.pagevar.IPageVariablesProvider; |
| import org.eclipse.jst.pagedesigner.jsp.core.pagevar.IVariableInfo; |
| import org.w3c.dom.Element; |
| |
| /** |
| * This is a static class. But it has "session" concept in it. To make it static |
| * is only to simplify its use. |
| * |
| * @author mengbo, ian.trimble@oracle.com |
| */ |
| public class PageExpressionContext { |
| private static final Logger _log = PDPlugin.getLogger(PageExpressionContext.class); |
| |
| static PageExpressionContext _current; |
| |
| List _pageVarProviders = new ArrayList(); |
| |
| private IProject _prj; |
| |
| /** |
| * @param prj |
| */ |
| public PageExpressionContext(IProject prj) { |
| _prj = prj; |
| } |
| |
| /** |
| * reset the context. |
| */ |
| public static void reset() { |
| _current = null; |
| } |
| |
| /** |
| * Initialize the current context |
| * @param prj |
| */ |
| public static void initialize(IProject prj) { |
| _current = new PageExpressionContext(prj); |
| } |
| |
| /** |
| * @return the current context |
| */ |
| public static PageExpressionContext getCurrent() { |
| return _current; |
| } |
| |
| /** |
| * @param provider |
| */ |
| public void pushPageVarProvider(IPageVariablesProvider provider) { |
| _pageVarProviders.add(provider); |
| } |
| |
| /** |
| * @param provider |
| */ |
| public void popPageVarProvider(IPageVariablesProvider provider) { |
| try { |
| _pageVarProviders.remove(_pageVarProviders.size() - 1); |
| } catch (Exception ex) { |
| _log.info("PageExpressionContext.Info.0", ex); //$NON-NLS-1$ |
| } |
| } |
| |
| /** |
| * This method is for design time expression evaluation. |
| * |
| * @param expression |
| * @param expectedClass |
| * @param options Current Element is passed with a key of "ELEMENT" |
| * @return the result of evaluating the expression |
| * @throws ELException |
| */ |
| public Object evaluateExpression(String expression, Class expectedClass, Map options) |
| throws ELException { |
| //Bug 319317 - Third-party plug-in providing javax.servlet.jsp.el version 2.1 or greater breaks WPE preview |
| String ret = expression; |
| if (options != null) { |
| Object objElement = options.get("ELEMENT"); //$NON-NLS-1$ |
| if (objElement instanceof Element) { |
| ret = ELValueResolver.resolve((Element)objElement, expression); |
| } |
| } |
| return ret; |
| } |
| |
| /** |
| * Gets an Object associated with a page variable. |
| * @param varName Page variable name. |
| * @return The Object associated with the named page variable, or null if the Object cannot be |
| * located. |
| */ |
| public Object getPageVariable(String varName) { |
| Object ret = null; |
| // reverse order. |
| for (int k = _pageVarProviders.size() - 1; k >= 0; k--) { |
| IPageVariablesProvider _pageVars = (IPageVariablesProvider) _pageVarProviders.get(k); |
| if (_pageVars != null) { |
| IVariableInfo[] vars = _pageVars.getBeanInfos(); |
| if (vars != null) { |
| for (int i = 0; i < vars.length; i++) { |
| if (varName.equals(vars[i].getName())) { |
| if (vars[i].getMode() == IVariableInfo.RESOURCEBUNDLE) { |
| String resourceName = vars[i].getTypeInfoString(); |
| IStorage storage = null; |
| try { |
| storage = LoadBundleUtil.getLoadBundleResource(_prj, resourceName); |
| } catch (CoreException cex) { |
| _log.info("PageExpressionContext.Info.0", cex); //$NON-NLS-1$ |
| } |
| if (storage != null) { |
| InputStream input = null; |
| try { |
| input = new BufferedInputStream(storage.getContents()); |
| Properties properties = new Properties(); |
| properties.load(input); |
| ret = properties; |
| } catch (Exception ignored) { |
| //ignore - we'll return null |
| } finally { |
| ResourceUtils.ensureClosed(input); |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
| return ret; |
| } |
| |
| |
| |
| static class ELValueResolver { |
| |
| static List<IELValueResolver> elValueResolvers; |
| |
| public static String resolve(final Element element, final String elExpression) { |
| String value = elExpression; |
| if (elValueResolvers == null) { |
| readELValueResolvers(); |
| } |
| for (IELValueResolver elValueResolver: elValueResolvers) { |
| value = elValueResolver.resolve(element, value); |
| } |
| return value; |
| } |
| |
| private static void readELValueResolvers() { |
| elValueResolvers = new ArrayList<IELValueResolver>(); |
| final IExtensionPoint pdExtPt = |
| Platform.getExtensionRegistry().getExtensionPoint( |
| PDPlugin.getPluginId(), IJMTConstants.EXTENSION_POINT_PAGEDESIGNER); |
| final IExtension[] extensions = pdExtPt.getExtensions(); |
| for (final IExtension extension: extensions) { |
| final IConfigurationElement[] configElements = extension.getConfigurationElements(); |
| for (final IConfigurationElement configElement: configElements) { |
| if (configElement.getName().equals("elValueResolver")) { //$NON-NLS-1$ |
| try { |
| final Object objValueResolver = configElement.createExecutableExtension("class"); //$NON-NLS-1$ |
| if (objValueResolver instanceof IELValueResolver) { |
| if (configElement.getContributor().getName().startsWith("org.eclipse.jst")) { //$NON-NLS-1$ |
| //add to end (give precedence to contributor-provided resolvers) |
| elValueResolvers.add((IELValueResolver)objValueResolver); |
| } else { |
| //add at beginning (give precedence to contributor-provided resolvers) |
| elValueResolvers.add(0, (IELValueResolver)objValueResolver); |
| } |
| } |
| } catch(CoreException ce) { |
| PDPlugin.log("Error reading extensions for: " + configElement.toString(), ce); //$NON-NLS-1$ |
| } |
| } |
| } |
| } |
| } |
| |
| } |
| |
| } |