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Viewing changes to profiling/org.eclipse.linuxtools.dataviewers.charts/src/org/eclipse/linuxtools/dataviewers/charts/UIHelper.java

  • Committer: Package Import Robot
  • Author(s): Jakub Adam
  • Date: 2012-06-29 12:07:30 UTC
  • Revision ID: package-import@ubuntu.com-20120629120730-bfri1xys1i71dpn6
Tags: upstream-1.0.0
Import upstream version 1.0.0

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profiling/org.eclipse.linuxtools.dataviewers.charts/src/org/eclipse/linuxtools/dataviewers/charts/UIHelper.java
 
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/*******************************************************************************
 
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 * Copyright (c) 2005 Actuate Corporation.
 
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 * All rights reserved. This program and the accompanying materials
 
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 * are made available under the terms of the Eclipse Public License v1.0
 
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 * which accompanies this distribution, and is available at
 
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 * http://www.eclipse.org/legal/epl-v10.html
 
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 *
 
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 * Contributors:
 
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 *  Actuate Corporation  - initial API and implementation
 
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 *******************************************************************************/
 
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package org.eclipse.linuxtools.dataviewers.charts;
 
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import java.io.File;
 
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import java.io.FileInputStream;
 
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import java.io.IOException;
 
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import java.net.MalformedURLException;
 
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import java.net.URL;
 
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import org.eclipse.core.runtime.Platform;
 
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import org.eclipse.jface.resource.ImageDescriptor;
 
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import org.eclipse.jface.resource.ImageRegistry;
 
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import org.eclipse.jface.resource.JFaceResources;
 
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import org.eclipse.swt.graphics.Image;
 
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import org.eclipse.swt.widgets.Display;
 
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/**
 
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 * This class has been created to hold methods that provide specific
 
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 * functionality or services.
 
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 */
 
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public final class UIHelper
 
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{
 
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        /**
 
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         * This method returns an URL for a resource given its plugin relative path.
 
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         * It is intended to be used to abstract out the usage of the UI as a plugin
 
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         * or standalone component when it comes to accessing resources.
 
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         * 
 
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         * @param sPluginRelativePath
 
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         *            The path to the resource relative to the plugin location.
 
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         * @return URL representing the location of the resource.
 
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         */
 
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        public static URL getURL( String sPluginRelativePath )
 
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        {
 
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                URL url = null;
 
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                if ( Platform.getExtensionRegistry( ) != null )
 
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                {
 
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                        try
 
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                        {
 
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                                url = new URL( Activator.getDefault( )
 
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                                                .getBundle( )
 
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                                                .getEntry( "/" ), sPluginRelativePath ); //$NON-NLS-1$
 
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                        }
 
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                        catch ( MalformedURLException e )
 
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                        {
 
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                                e.printStackTrace( );
 
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                        }
 
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                }
 
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                else
 
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                {
 
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                        try
 
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                        {
 
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                                url = new URL( "file:///" + new File( sPluginRelativePath ).getAbsolutePath( ) ); //$NON-NLS-1$
 
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                        }
 
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                        catch ( MalformedURLException e )
 
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                        {
 
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                                e.printStackTrace( );
 
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                        }
 
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                }
 
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                return url;
 
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        }
 
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        private static Image createImage( String sPluginRelativePath )
 
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        {
 
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                Image img = null;
 
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                try
 
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                {
 
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                        try
 
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                        {
 
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                                img = new Image( Display.getCurrent( ),
 
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                                                getURL( sPluginRelativePath ).openStream( ) );
 
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                        }
 
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                        catch ( MalformedURLException e1 )
 
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                        {
 
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                                img = new Image( Display.getCurrent( ),
 
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                                                new FileInputStream( getURL( sPluginRelativePath ).toString( ) ) );
 
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                        }
 
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                }
 
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                catch ( IOException e )
 
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                {
 
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                        e.printStackTrace( );
 
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                }
 
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                // If still can't load, return a dummy image.
 
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                if ( img == null )
 
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                {
 
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                        img = new Image( Display.getCurrent( ), 1, 1 );
 
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                }
 
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                return img;
 
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        }
 
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        /**
 
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         * This is a convenience method to get an imgIcon from a URL.
 
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         * 
 
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         * @param sPluginRelativePath
 
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         *            The URL for the imgIcon.
 
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         * @return The imgIcon represented by the given URL.
 
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         * @see #setImageCached( boolean )
 
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         */
 
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        public static Image getImage( String sPluginRelativePath )
 
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        {
 
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                ImageRegistry registry = JFaceResources.getImageRegistry( );
 
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                Image image = registry.get( sPluginRelativePath );
 
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                if ( image == null )
 
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                {
 
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                        image = createImage( sPluginRelativePath );
 
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                        registry.put( sPluginRelativePath, image );
 
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                }
 
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                return image;
 
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        }
 
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        /**
 
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         * This is a convenience method to get an imgIcon from a URL.
 
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         * 
 
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         * @param sPluginRelativePath
 
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         *            The URL for the imgIcon.
 
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         * @return The imgIcon represented by the given URL.
 
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         * @see #setImageCached( boolean )
 
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         */
 
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        public static ImageDescriptor getImageDescriptor( String sPluginRelativePath )
 
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        {
 
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                ImageRegistry registry = JFaceResources.getImageRegistry( );
 
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                ImageDescriptor image = registry.getDescriptor( sPluginRelativePath );
 
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                if ( image == null )
 
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                {
 
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                        registry.put( sPluginRelativePath,
 
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                                        createImage( sPluginRelativePath ) );
 
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                        image = registry.getDescriptor( sPluginRelativePath );
 
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                }
 
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                return image;
 
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        }
 
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}
 
 
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