| /* |
| * Copyright (c) 2011 Google Inc. |
| * |
| * 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 com.google.eclipse.protobuf.ui.util; |
| |
| import static com.google.common.collect.Lists.newArrayList; |
| import static java.util.Collections.*; |
| |
| import java.io.File; |
| import java.util.List; |
| |
| import org.eclipse.core.resources.*; |
| import org.eclipse.core.runtime.*; |
| import org.eclipse.emf.common.util.URI; |
| |
| import com.google.inject.Singleton; |
| |
| /** |
| * Utility methods related to URIs. |
| * |
| * @author alruiz@google.com (Alex Ruiz) |
| */ |
| @Singleton public class Uris { |
| public static String PLATFORM_RESOURCE_PREFIX = "platform:/resource"; |
| public static String FILE_PREFIX = "file:"; |
| |
| /** |
| * Indicates whether the resource or file referred by the given URI exists. |
| * @param uri the URI to check. |
| * @return {@code true} if the resource or file referred by the given URI exists, {@code false} otherwise. |
| */ |
| public boolean referredResourceExists(URI uri) { |
| if (uri.isFile()) { |
| File file = new File(uri.path()); |
| return file.exists(); |
| } |
| if (uri.isPlatformResource()) { |
| return referredFileExists(uri); |
| } |
| return false; |
| } |
| |
| /** |
| * Returns the segments of the given URI without the file name (last segment.) |
| * @param uri the give URI. |
| * @return the segments of the given URI without the file name (last segment.) |
| */ |
| public List<String> segmentsWithoutFileName(URI uri) { |
| List<String> originalSegments = uri.segmentsList(); |
| if (originalSegments.isEmpty()) { |
| return emptyList(); |
| } |
| List<String> segments = newArrayList(originalSegments); |
| if (uri.isPlatformResource()) { |
| segments.remove(0); |
| } |
| segments.remove(segments.size() - 1); |
| return unmodifiableList(segments); |
| } |
| |
| /** |
| * Returns the "prefix" of the given URI as follows: |
| * <ul> |
| * <li><code>{@link #PLATFORM_RESOURCE_PREFIX}</code>, if the URI refers to a platform resource</li> |
| * <li><code>{@link #FILE_PREFIX}</code>, if the URI refers to a file</li> |
| * <li>{@code null} otherwise</li> |
| * </ul> |
| * @param uri the given URI. |
| * @return the "prefix" of the given URI. |
| */ |
| public String prefixOf(URI uri) { |
| if (uri.isFile()) { |
| return FILE_PREFIX; |
| } |
| if (uri.isPlatformResource()) { |
| return PLATFORM_RESOURCE_PREFIX; |
| } |
| return ""; |
| } |
| |
| /** |
| * Returns the project that contains the file referred by the given URI. |
| * @param resourceUri the given URI. |
| * @return the project that contains the file referred by the given URI, or {@code null} if the resource referred by |
| * the given URI is not a file in the workspace. |
| */ |
| public IProject projectOfReferredFile(URI resourceUri) { |
| IFile file = referredFile(resourceUri); |
| return (file != null) ? file.getProject() : null; |
| } |
| |
| /** |
| * Indicates whether the given URI refers to an existing file. |
| * @param fileUri the URI to check, as a {@code String}. |
| * @return {@code true} if the given URI refers to an existing file, {@code false} otherwise. |
| */ |
| public boolean referredFileExists(URI fileUri) { |
| IFile file = referredFile(fileUri); |
| return (file != null) ? file.exists() : false; |
| } |
| |
| /** |
| * Returns a handle to a workspace file referred by the given URI. |
| * @param uri the given URI. |
| * @return a handle to a workspace file referred by the given URI or {@code null} if the URI does not refer a |
| * workspace file. |
| */ |
| public IFile referredFile(URI uri) { |
| IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot(); |
| IPath path = pathOf(uri); |
| return (path != null) ? root.getFile(path) : null; |
| } |
| |
| private IPath pathOf(URI uri) { |
| String uriAsText = uri.toPlatformString(true); |
| return (uriAsText != null) ? new Path(uriAsText) : null; |
| } |
| } |