ResourcePathConverter


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   ******************************************************************************/
11  
12  package org.eclipse.ui.internal.ide.commands;
13  
14  import org.eclipse.core.commands.AbstractParameterValueConverter;
15  import org.eclipse.core.commands.ParameterValueConversionException;
16  import org.eclipse.core.resources.IResource;
17  import org.eclipse.core.resources.IWorkspaceRoot;
18  import org.eclipse.core.resources.ResourcesPlugin;
19  import org.eclipse.core.runtime.Path;
20  
21  /**
22   * A command parameter value converter to convert between IResources and strings
23   * encoding the path of a resource.
24   * 
25   * @since 3.2
26   */
27  public final class ResourcePathConverter extends
28          AbstractParameterValueConverter {
29  
30      public final Object   convertToObject(final String   parameterValue)
31              throws ParameterValueConversionException {
32          final Path path = new Path(parameterValue);
33          final IWorkspaceRoot workspaceRoot = ResourcesPlugin.getWorkspace()
34                  .getRoot();
35          final IResource resource = workspaceRoot.findMember(path);
36  
37          if ((resource == null) || (!resource.exists())) {
38              throw new ParameterValueConversionException(
39                      "parameterValue must be the path of an existing resource"); //$NON-NLS-1$
40          }
41  
42          return resource;
43      }
44  
45      public final String   convertToString(final Object   parameterValue)
46              throws ParameterValueConversionException {
47          if (!(parameterValue instanceof IResource)) {
48              throw new ParameterValueConversionException(
49                      "parameterValue must be an IResource"); //$NON-NLS-1$
50          }
51          final IResource resource = (IResource) parameterValue;
52          return resource.getFullPath().toString();
53      }
54  }
55
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