ext.org.eclipse.jdt.internal.ui.packageview.PackageExplorerLabelProvider.java Source code

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Here is the source code for ext.org.eclipse.jdt.internal.ui.packageview.PackageExplorerLabelProvider.java

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/*******************************************************************************
 * Copyright (c) 2000, 2011 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 ext.org.eclipse.jdt.internal.ui.packageview;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import org.eclipse.swt.graphics.Image;

import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.IPath;

import org.eclipse.core.resources.IFolder;

import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.viewers.StyledString;

import org.eclipse.ui.IWorkingSet;

import org.eclipse.jdt.core.IPackageFragment;
import org.eclipse.jdt.ui.JavaElementLabels;

import ext.org.eclipse.jdt.internal.ui.viewsupport.AppearanceAwareLabelProvider;
import ext.org.eclipse.jdt.internal.ui.viewsupport.JavaElementImageProvider;

/**
 * Provides the labels for the Package Explorer.
 * <p>
 * It provides labels for the packages in hierarchical layout and in all
 * other cases delegates it to its super class.
 * </p>
 * @since 2.1
 */
public class PackageExplorerLabelProvider extends AppearanceAwareLabelProvider {

    private PackageExplorerContentProvider fContentProvider;
    private Map<ImageDescriptor, Image> fWorkingSetImages;

    private boolean fIsFlatLayout;
    private PackageExplorerProblemsDecorator fProblemDecorator;

    public PackageExplorerLabelProvider(PackageExplorerContentProvider cp) {
        super(DEFAULT_TEXTFLAGS | JavaElementLabels.P_COMPRESSED | JavaElementLabels.ALL_CATEGORY,
                DEFAULT_IMAGEFLAGS | JavaElementImageProvider.SMALL_ICONS);

        fProblemDecorator = new PackageExplorerProblemsDecorator();
        addLabelDecorator(fProblemDecorator);
        Assert.isNotNull(cp);
        fContentProvider = cp;
        fWorkingSetImages = null;
    }

    /* (non-Javadoc)
     * @see org.eclipse.jdt.internal.ui.viewsupport.JavaUILabelProvider#getStyledText(java.lang.Object)
     */
    @Override
    public StyledString getStyledText(Object element) {
        String text = getSpecificText(element);
        if (text != null) {
            return new StyledString(decorateText(text, element));
        }
        return super.getStyledText(element);
    }

    private String getSpecificText(Object element) {
        if (!fIsFlatLayout && element instanceof IPackageFragment) {
            IPackageFragment fragment = (IPackageFragment) element;
            Object parent = fContentProvider.getHierarchicalPackageParent(fragment);
            if (parent instanceof IPackageFragment) {
                return getNameDelta((IPackageFragment) parent, fragment);
            } else if (parent instanceof IFolder) { // bug 152735
                return getNameDelta((IFolder) parent, fragment);
            }
        } else if (element instanceof IWorkingSet) {
            return ((IWorkingSet) element).getLabel();
        }
        return null;
    }

    @Override
    public String getText(Object element) {
        String text = getSpecificText(element);
        if (text != null) {
            return decorateText(text, element);
        }
        return super.getText(element);
    }

    private String getNameDelta(IPackageFragment parent, IPackageFragment fragment) {
        String prefix = parent.getElementName() + '.';
        String fullName = fragment.getElementName();
        if (fullName.startsWith(prefix)) {
            return fullName.substring(prefix.length());
        }
        return fullName;
    }

    private String getNameDelta(IFolder parent, IPackageFragment fragment) {
        IPath prefix = parent.getFullPath();
        IPath fullPath = fragment.getPath();
        if (prefix.isPrefixOf(fullPath)) {
            StringBuffer buf = new StringBuffer();
            for (int i = prefix.segmentCount(); i < fullPath.segmentCount(); i++) {
                if (buf.length() > 0)
                    buf.append('.');
                buf.append(fullPath.segment(i));
            }
            return buf.toString();
        }
        return fragment.getElementName();
    }

    @Override
    public Image getImage(Object element) {
        if (element instanceof IWorkingSet) {
            ImageDescriptor image = ((IWorkingSet) element).getImageDescriptor();
            if (image == null) {
                return null;
            }
            if (fWorkingSetImages == null) {
                fWorkingSetImages = new HashMap<ImageDescriptor, Image>();
            }

            Image result = fWorkingSetImages.get(image);
            if (result == null) {
                result = image.createImage();
                fWorkingSetImages.put(image, result);
            }
            return decorateImage(result, element);
        }
        return super.getImage(element);
    }

    public void setIsFlatLayout(boolean state) {
        fIsFlatLayout = state;
        fProblemDecorator.setIsFlatLayout(state);
    }

    @Override
    public void dispose() {
        if (fWorkingSetImages != null) {
            for (Iterator<Image> iter = fWorkingSetImages.values().iterator(); iter.hasNext();) {
                iter.next().dispose();
            }
        }
        super.dispose();
    }
}