org.eclipse.ajdt.mylyn.ui.AspectJStructureBridge.java Source code

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Here is the source code for org.eclipse.ajdt.mylyn.ui.AspectJStructureBridge.java

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/*******************************************************************************
 * Copyright (c) 2008 Mylyn project committers 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:
 * Andrew Eisenberg  (SpringSource)
 *******************************************************************************/
package org.eclipse.ajdt.mylyn.ui;

import org.eclipse.ajdt.core.AspectJCore;
import org.eclipse.ajdt.core.javaelements.IAJCodeElement;
import org.eclipse.ajdt.core.javaelements.IAspectJElement;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IMarker;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.IImportDeclaration;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.internal.ui.util.ExceptionHandler;
import org.eclipse.mylyn.commons.core.StatusHandler;
import org.eclipse.mylyn.internal.java.ui.JavaStructureBridge;
import org.eclipse.ui.views.markers.internal.ConcreteMarker;

/**
 * Structure bridge so that AspectJ program elements can be a part of a mylyn 
 * task context. 
 * @author andrew eisenberg
 *
 */
public class AspectJStructureBridge extends JavaStructureBridge {

    public final static String CONTENT_TYPE = "aspectj";

    public String getContentType() {
        return CONTENT_TYPE;
    }

    @Override
    public String getHandleForOffsetInObject(Object object, int offset) {
        IMarker marker;
        int charStart = 0;
        if (object instanceof ConcreteMarker) {
            marker = ((ConcreteMarker) object).getMarker();
        } else if (object instanceof IMarker) {
            marker = (IMarker) object;
        } else {
            return null;
        }

        Object attribute = marker.getAttribute(IMarker.CHAR_START, 0);
        if (attribute instanceof Integer) {
            charStart = ((Integer) attribute).intValue();
        }

        try {
            ICompilationUnit compilationUnit = null;
            IResource resource = marker.getResource();
            if (resource instanceof IFile) {
                IFile file = (IFile) resource;
                // TODO: get rid of file extension check
                if (file.getFileExtension().equals("aj")) {
                    compilationUnit = JavaCore.createCompilationUnitFrom(file);
                } else {
                    return null;
                }
            }
            if (compilationUnit != null) {
                IJavaElement javaElement = compilationUnit.getElementAt(charStart);
                if (javaElement != null) {
                    if (javaElement instanceof IImportDeclaration)
                        javaElement = javaElement.getParent().getParent();
                    return javaElement.getHandleIdentifier();
                } else {
                    return null;
                }
            } else {
                return null;
            }
        } catch (JavaModelException ex) {
            if (!ex.isDoesNotExist())
                ExceptionHandler.handle(ex, "error", "could not find java element"); //$NON-NLS-2$ //$NON-NLS-1$
            return null;
        } catch (Throwable t) {
            StatusHandler.log(new Status(IStatus.ERROR, AspectJStructureBridgePlugin.PLUGIN_ID,
                    "Could not find element for: " + marker, t));
            return null;
        }
    }

    @Override
    public Object getObjectForHandle(String handle) {
        try {
            return AspectJCore.create(handle);
        } catch (Throwable t) {
            StatusHandler.log(new Status(IStatus.WARNING, AspectJStructureBridgePlugin.PLUGIN_ID,
                    "Could not create java element for handle: " + handle, t));
            return null;
        }
    }

    @Override
    public boolean acceptsObject(Object object) {
        return object instanceof IAJCodeElement || object instanceof IAspectJElement;

    }

}