EclipseHomeVariableResolver


1   /*******************************************************************************
2    * Copyright (c) 2006 IBM Corporation and others.
3    * All rights reserved. This program and the accompanying materials 
4    * are made available under the terms of the Eclipse Public License v1.0
5    * which accompanies this distribution, and is available at
6    * http://www.eclipse.org/legal/epl-v10.html
7    * 
8    * Contributors:
9    *     IBM Corporation - initial API and implementation
10   *     Bjorn Freeman-Benson - initial API and implementation
11   *******************************************************************************/
12  package org.eclipse.core.internal.variables;
13  
14  import java.net.URL  ;
15  
16  import org.eclipse.core.runtime.CoreException;
17  import org.eclipse.core.runtime.Platform;
18  import org.eclipse.core.variables.IDynamicVariable;
19  import org.eclipse.core.variables.IDynamicVariableResolver;
20  import org.eclipse.osgi.service.datalocation.Location;
21  
22  /**
23   * Resolver for ${eclipse_home}
24   * 
25   * @since 3.2
26   */
27  public class EclipseHomeVariableResolver implements IDynamicVariableResolver {
28  
29      public String   resolveValue(IDynamicVariable variable, String   argument) throws CoreException {
30          Location installLocation = Platform.getInstallLocation();
31          if (installLocation != null) {
32              URL   url = installLocation.getURL();
33              if (url != null) {
34                  String   file = url.getFile();
35                  if (file.length() != 0) {
36                      return file;
37                  }
38              }
39          }
40          return null;
41      }
42  
43  }
44

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