org.eclipse.datatools.sqltools.internal.sqlscrapbook.SQLScrapbookImages.java Source code

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Here is the source code for org.eclipse.datatools.sqltools.internal.sqlscrapbook.SQLScrapbookImages.java

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/*******************************************************************************
 * Copyright (c) 2006, 2007 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
 *******************************************************************************/
package org.eclipse.datatools.sqltools.internal.sqlscrapbook;

import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;
import java.util.Iterator;

import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.resource.ImageRegistry;
import org.eclipse.swt.graphics.Image;

/**
 * 
 * @author lihuang
 *
 */
public final class SQLScrapbookImages {
    private SQLScrapbookImages() {
        // Do not instantiate
    }

    private static final String NAME_PREFIX = "org.eclipse.datatools.sqltools.sqlscrapbook";
    private static final int NAME_PREFIX_LENGTH = NAME_PREFIX.length();
    private static URL baseURL = null;

    // The plugin registry
    private static ImageRegistry imageRegistry = null;
    private static HashMap avoidSWTErrorMap = new HashMap();

    static {
        String pathSuffix = "images/";
        baseURL = SqlscrapbookPlugin.getDefault().getBundle().getEntry(pathSuffix);
    }

    public static final String IMG_ATTACH_PROFILE = NAME_PREFIX + "attach_profile.gif";
    public static final ImageDescriptor DESC_ATTACH_PROFILE = createManaged(null, IMG_ATTACH_PROFILE);

    /**
     * Returns the image managed under the given key in this registry.
     * 
     * @param key the image's key
     * @return the image managed under the given key
     */
    public static Image get(String key) {
        return getImageRegistry().get(key);
    }

    /*
     * Helper method to access the image registry from the JDIDebugUIPlugin class.
     */
    static ImageRegistry getImageRegistry() {
        if (imageRegistry == null) {
            imageRegistry = new ImageRegistry();
            for (Iterator iter = avoidSWTErrorMap.keySet().iterator(); iter.hasNext();) {
                String key = (String) iter.next();
                imageRegistry.put(key, (ImageDescriptor) avoidSWTErrorMap.get(key));
            }
            avoidSWTErrorMap = null;
        }
        return imageRegistry;
    }

    private static ImageDescriptor createManaged(String prefix, String name) {
        try {
            ImageDescriptor result = ImageDescriptor
                    .createFromURL(makeIconFileURL(prefix, name.substring(NAME_PREFIX_LENGTH)));

            avoidSWTErrorMap.put(name, result);
            return result;
        } catch (MalformedURLException e) {
            return ImageDescriptor.getMissingImageDescriptor();
        }

    }

    private static URL makeIconFileURL(String prefix, String name) throws MalformedURLException {
        if (baseURL == null) {
            throw new MalformedURLException();
        }
        StringBuffer buffer = new StringBuffer();
        if (prefix != null) {
            buffer = new StringBuffer(prefix);
            buffer.append('/');
        }
        buffer.append(name);
        return new URL(baseURL, buffer.toString());
    }

}