org.eclipse.ajdt.internal.ui.editor.PointcutSourceHover.java Source code

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Here is the source code for org.eclipse.ajdt.internal.ui.editor.PointcutSourceHover.java

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/*******************************************************************************
 * Copyright (c) 2000, 2005 IBM Corporation 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ajdt.internal.ui.editor;

import org.eclipse.ajdt.core.javaelements.AJCompilationUnit;
import org.eclipse.ajdt.core.javaelements.AJCompilationUnitManager;
import org.eclipse.ajdt.core.javaelements.PointcutUtilities;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.ISourceReference;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.internal.ui.actions.SelectionConverter;
import org.eclipse.jdt.internal.ui.javaeditor.JavaEditor;
import org.eclipse.jdt.internal.ui.text.java.hover.AbstractJavaEditorTextHover;
import org.eclipse.jface.text.IInformationControl;
import org.eclipse.jface.text.IInformationControlCreator;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITextHoverExtension;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.information.IInformationProviderExtension2;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.editors.text.EditorsUI;

/**
 * Hover to show the definition of pointcuts. Loosely based on
 * org.eclipse.jdt.internal.ui.text.java.hover.JavaSourceHover
 */
public class PointcutSourceHover extends AbstractJavaEditorTextHover
        implements ITextHoverExtension, IInformationProviderExtension2 {

    /*
     * @see ITextHover#getHoverInfo(ITextViewer, IRegion)
     */
    public String getHoverInfo(ITextViewer textViewer, IRegion hoverRegion) {
        if (!(getEditor() instanceof AspectJEditor)) {
            return null;
        }
        IJavaElement input = SelectionConverter.getInput((JavaEditor) getEditor());
        int offset = hoverRegion.getOffset();
        if (input instanceof ICompilationUnit) {
            input = AJCompilationUnitManager.mapToAJCompilationUnit((ICompilationUnit) input);
        }
        if (input instanceof AJCompilationUnit) {
            AJCompilationUnit ajcu = (AJCompilationUnit) input;
            String source = PointcutUtilities.isInPointcutContext(ajcu, offset);
            if (source != null) {
                String id = PointcutUtilities.findIdentifier(source, offset);
                if (id != null) {
                    try {
                        IJavaElement pc = PointcutUtilities.findPointcut(ajcu.getElementAt(offset), id);
                        if (pc != null) {
                            IResource res = pc.getUnderlyingResource();
                            AJCompilationUnit cu = AJCompilationUnitManager.INSTANCE
                                    .getAJCompilationUnit((IFile) res);
                            if (cu != null) {
                                cu.requestOriginalContentMode();
                                String pcs = ((ISourceReference) pc).getSource();
                                cu.discardOriginalContentMode();
                                return pcs;
                            }
                            return ((ISourceReference) pc).getSource();
                        }
                    } catch (JavaModelException e) {
                    }
                }
            }
        }
        return null;
    }

    /*
     * @see org.eclipse.jface.text.ITextHoverExtension#getHoverControlCreator()
     * @since 3.0
     */
    public IInformationControlCreator getHoverControlCreator() {
        return new IInformationControlCreator() {
            public IInformationControl createInformationControl(Shell parent) {
                // need to use our own version to get AJ keyword highlighting
                return new AJSourceViewerInformationControl(parent, EditorsUI.getTooltipAffordanceString());
            }
        };
    }

    /*
     * @see IInformationProviderExtension2#getInformationPresenterControlCreator()
     * @since 3.0
     */
    public IInformationControlCreator getInformationPresenterControlCreator() {
        return new IInformationControlCreator() {
            public IInformationControl createInformationControl(Shell parent) {
                int shellStyle = SWT.RESIZE | SWT.TOOL;
                int style = SWT.V_SCROLL | SWT.H_SCROLL;
                // need to use our own version to get AJ keyword highlighting
                return new AJSourceViewerInformationControl(parent, shellStyle, style);
            }
        };
    }

}