org.caleydo.data.loader.ResourceLoader.java Source code

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Here is the source code for org.caleydo.data.loader.ResourceLoader.java

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/*******************************************************************************
 * Caleydo - Visualization for Molecular Biology - http://caleydo.org
 * Copyright (c) The Caleydo Team. All rights reserved.
 * Licensed under the new BSD license, available at http://caleydo.org/license
 ******************************************************************************/
package org.caleydo.data.loader;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import org.caleydo.data.loader.ResourceLocators.IResourceLocator;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Display;
import org.xml.sax.InputSource;

/**
 * Utility classes to load resources within the Caleydo project.
 *
 * @author Marc Streit
 */
public class ResourceLoader {
    private final IResourceLocator locator;

    public ResourceLoader(IResourceLocator locator) {
        this.locator = locator;
    }

    /**
     * @return the locator, see {@link #locator}
     */
    public IResourceLocator getLocator() {
        return locator;
    }

    private InputStream getChecked(String res) {
        InputStream in = locator.get(res);
        if (in == null)
            throw cantFind(res, null);
        if (!(in instanceof BufferedInputStream))
            in = new BufferedInputStream(in);
        return in;
    }

    private IllegalStateException cantFind(String res, IOException e) {
        if (e != null)
            return new IllegalStateException("Cannot load resource: " + res + " in locator: " + locator, e);
        else
            return new IllegalStateException("Cannot load resource: " + res + " in locator: " + locator);
    }

    public final InputStream get(String res) {
        return getChecked(res);
    }

    public final BufferedReader getResource(String fileName) {
        return new BufferedReader(new InputStreamReader(getChecked(fileName)));
    }

    public final InputSource getInputSource(String fileName) {
        return new InputSource(getChecked(fileName));
    }

    public final Image getImage(Display display, String fileName) {
        return new Image(display, getChecked(fileName));
    }

    public final ImageDescriptor getImageDescriptor(Display display, String res) {
        return ImageDescriptor.createFromImage(getImage(display, res));
    }
}