org.eclipse.wb.internal.xwt.parser.XwtEditorContext.java Source code

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Here is the source code for org.eclipse.wb.internal.xwt.parser.XwtEditorContext.java

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/*******************************************************************************
 * Copyright (c) 2011 Google, Inc.
 * 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:
 *    Google, Inc. - initial API and implementation
 *******************************************************************************/
package org.eclipse.wb.internal.xwt.parser;

import com.google.common.collect.ImmutableMap;

import org.eclipse.wb.internal.core.model.description.resource.IDescriptionVersionsProvider;
import org.eclipse.wb.internal.core.model.description.resource.IDescriptionVersionsProviderFactory;
import org.eclipse.wb.internal.core.utils.external.ExternalFactoriesHelper;
import org.eclipse.wb.internal.core.utils.reflect.BundleClassLoader;
import org.eclipse.wb.internal.core.utils.reflect.CompositeClassLoader;
import org.eclipse.wb.internal.core.xml.model.EditorContext;
import org.eclipse.wb.internal.core.xml.model.ILiveEditorContext;
import org.eclipse.wb.internal.core.xml.model.XmlObjectInfo;
import org.eclipse.wb.internal.rcp.RcpToolkitDescription;

import org.eclipse.core.resources.IFile;
import org.eclipse.jface.text.Document;
import org.eclipse.jface.text.IDocument;

import org.apache.commons.lang.StringUtils;

import java.security.AccessController;
import java.security.PrivilegedExceptionAction;
import java.util.List;

/**
 * {@link EditorContext} for XWT.
 * 
 * @author scheglov_ke
 * @coverage XWT.parser
 */
public final class XwtEditorContext extends EditorContext {
    ////////////////////////////////////////////////////////////////////////////
    //
    // Constructor
    //
    ////////////////////////////////////////////////////////////////////////////
    public XwtEditorContext(IFile file, IDocument document) throws Exception {
        super(RcpToolkitDescription.INSTANCE, file, document);
        configureDescriptionVersionsProviders();
        addVersions(ImmutableMap.of("isXWT", "true"));
    }

    ////////////////////////////////////////////////////////////////////////////
    //
    // ClassLoader
    //
    ////////////////////////////////////////////////////////////////////////////
    @Override
    protected void addParentClassLoaders(final CompositeClassLoader parentClassLoader) throws Exception {
        super.addParentClassLoaders(parentClassLoader);
        AccessController.doPrivileged(new PrivilegedExceptionAction<Object>() {
            public Object run() throws Exception {
                addParentClassLoaders_impl(parentClassLoader);
                return null;
            }
        });
    }

    private static void addParentClassLoaders_impl(CompositeClassLoader parentClassLoader) {
        parentClassLoader.add(new BundleClassLoader("org.eclipse.wb.xwt"), null);
    }

    ////////////////////////////////////////////////////////////////////////////
    //
    // Live support
    //
    ////////////////////////////////////////////////////////////////////////////
    @Override
    public ILiveEditorContext getLiveContext() {
        return m_liveEditorContext;
    }

    private final ILiveEditorContext m_liveEditorContext = new ILiveEditorContext() {
        public XmlObjectInfo parse(String[] sourceLines) throws Exception {
            XmlObjectInfo root;
            {
                String source = StringUtils.join(sourceLines, "\n");
                IDocument document = new Document(source);
                XwtParser parser = new XwtParser(m_file, document);
                root = parser.parse();
            }
            root.getContext().setLiveComponent(true);
            return root;
        }

        public void dispose() throws Exception {
        }
    };

    ////////////////////////////////////////////////////////////////////////////
    //
    // IDescriptionVersionsProvider
    //
    ////////////////////////////////////////////////////////////////////////////
    /**
     * Installs {@link IDescriptionVersionsProvider}'s.
     */
    private void configureDescriptionVersionsProviders() throws Exception {
        List<IDescriptionVersionsProviderFactory> factories = ExternalFactoriesHelper.getElementsInstances(
                IDescriptionVersionsProviderFactory.class,
                "org.eclipse.wb.core.descriptionVersionsProviderFactories", "factory");
        for (IDescriptionVersionsProviderFactory factory : factories) {
            // versions
            addVersions(factory.getVersions(m_javaProject, m_classLoader));
            // version providers
            {
                IDescriptionVersionsProvider provider = factory.getProvider(m_javaProject, m_classLoader);
                if (provider != null) {
                    addDescriptionVersionsProvider(provider);
                }
            }
        }
    }
}