PlatformConfigurationUtils


1   /*******************************************************************************
2    * Copyright (c) 2003, 2004 IBM Corporation and others.
3    * All rights reserved. This program and the accompanying materials
4    * are made available under the terms of the Common Public License v1.0
5    * which accompanies this distribution, and is available at
6    * http://www.eclipse.org/legal/cpl-v10.html
7    * 
8    * Contributors:
9    *     IBM Corporation - initial API and implementation
10   *******************************************************************************/
11  package org.eclipse.pde.internal.core;
12  
13  import java.io.*;
14  import java.net.*;
15  import java.util.*;
16  
17  import org.eclipse.core.internal.boot.*;
18  
19  public class PlatformConfigurationUtils {
20      private static final String   PLUGIN_PATH = ".plugin-path"; //$NON-NLS-1$
21  
22      /*
23       * This method is retained for R1.0 compatibility because it is defined as API.
24       * It's function matches the API description (returns <code>null</code> when
25       * argument URL is <code>null</code> or cannot be read).
26       */
27      public static URL[] getPluginPath(URL pluginPathLocation /*R1.0 compatibility*/
28      ) {
29          InputStream input = null;
30          // first try and see if the given plugin path location exists.
31          if (pluginPathLocation == null)
32              return null;
33          try {
34              input = pluginPathLocation.openStream();
35          } catch (IOException e) {
36              //fall through
37          }
38  
39          // if the given path was null or did not exist, look for a plugin path
40          // definition in the install location.
41          if (input == null)
42              try {
43                  URL url = new URL(PlatformURLBaseConnection.PLATFORM_URL_STRING + PLUGIN_PATH);
44                  input = url.openStream();
45              } catch (MalformedURLException e) {
46                  //fall through
47              } catch (IOException e) {
48                  //fall through
49              }
50  
51          // nothing was found at the supplied location or in the install location
52          if (input == null)
53              return null;
54          // if we found a plugin path definition somewhere so read it and close the location.
55          URL[] result = null;
56          try {
57              try {
58                  result = readPluginPath(input);
59              } finally {
60                  input.close();
61              }
62          } catch (IOException e) {
63              //let it return null on failure to read
64          }
65          return result;
66      }
67  
68      private static URL[] readPluginPath(InputStream input) {
69          Properties ini = new Properties();
70          try {
71              ini.load(input);
72          } catch (IOException e) {
73              return null;
74          }
75          Vector result = new Vector(5);
76          for (Enumeration groups = ini.propertyNames(); groups.hasMoreElements();) {
77              String   group = (String  ) groups.nextElement();
78              for (StringTokenizer entries = new StringTokenizer(ini.getProperty(group), ";"); entries.hasMoreElements();) { //$NON-NLS-1$
79                  String   entry = (String  ) entries.nextElement();
80                  if (!entry.equals("")) //$NON-NLS-1$
81                      try {
82                          result.addElement(new URL(entry));
83                      } catch (MalformedURLException e) {
84                      }
85              }
86          }
87          return (URL[]) result.toArray(new URL[result.size()]);
88      }
89  }
90
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