org.eclipse.xtext.ui.resource.JarEntryLocator.java Source code

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Here is the source code for org.eclipse.xtext.ui.resource.JarEntryLocator.java

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/*******************************************************************************
 * Copyright (c) 2010 itemis AG (http://www.itemis.eu) 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
 *******************************************************************************/
package org.eclipse.xtext.ui.resource;

import org.apache.log4j.Logger;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;
import org.eclipse.emf.common.util.URI;
import org.eclipse.jdt.core.IJarEntryResource;
import org.eclipse.jdt.core.IPackageFragment;
import org.eclipse.jdt.core.IPackageFragmentRoot;
import org.eclipse.jdt.internal.core.ExternalPackageFragmentRoot;
import org.eclipse.xtext.ui.resource.PackageFragmentRootWalker.TraversalState;

/**
 * @author Sven Efftinge - Initial contribution and API
 * @author Sebastian Zarnekow - Initial contribution and API
 */
public class JarEntryLocator {

    @SuppressWarnings("unused")
    private static final Logger log = Logger.getLogger(JarEntryLocator.class);

    /**
     * @return a URI for the given jarEntry, can be <code>null</code>.
     */
    public URI getURI(IPackageFragmentRoot root, IJarEntryResource jarEntry, TraversalState state) {
        if (root.isArchive()) {
            URI jarURI = JarEntryURIHelper.getUriForPackageFragmentRoot(root);
            URI storageURI = URI.createURI(jarEntry.getFullPath().toString());
            return createJarURI(root.isArchive(), jarURI, storageURI);
        } else if (root instanceof ExternalPackageFragmentRoot) {
            IResource resource = ((ExternalPackageFragmentRoot) root).resource();
            IPath result = resource.getFullPath();
            for (int i = 1; i < state.getParents().size(); i++) {
                Object obj = state.getParents().get(i);
                if (obj instanceof IPackageFragment) {
                    result = result.append(new Path(((IPackageFragment) obj).getElementName().replace('.', '/')));
                } else if (obj instanceof IJarEntryResource) {
                    result = result.append(((IJarEntryResource) obj).getName());
                }
            }
            result = result.append(jarEntry.getName());
            return URI.createPlatformResourceURI(result.toString(), true);
        } else {
            throw new IllegalStateException("Unexpeced root type: " + root.getClass().getName());
        }
    }

    protected URI createJarURI(boolean isArchive, URI uriToRoot, URI pathToResourceInRoot) {
        if (isArchive) {
            String fullURI = "archive:" + uriToRoot.toString() + "!" + pathToResourceInRoot.toString();
            return URI.createURI(fullURI);
        } else {
            return null;
        }
    }
}