net.sourceforge.phpeclipse.externaltools/src/net/sourceforge/phpdt/externaltools/internal/registry/RefreshScopeVariable.java

   1 package net.sourceforge.phpdt.externaltools.internal.registry;
   2
   3 /**********************************************************************
   4  Copyright (c) 2002 IBM Corp. and others. All rights reserved.
   5  This file is made available under the terms of the Common Public License v1.0
   6  which accompanies this distribution, and is available at
   7  http://www.eclipse.org/legal/cpl-v10.html
   8  �
   9  Contributors:
  10  **********************************************************************/
  11
  12 import net.sourceforge.phpdt.externaltools.variable.ExpandVariableContext;
  13 import net.sourceforge.phpdt.externaltools.variable.IVariableResourceExpander;
  14
  15 import org.eclipse.core.resources.IResource;
  16 import org.eclipse.core.runtime.IConfigurationElement;
  17
  18 /**
  19  * Represents the variable for a refresh scope.
  20  */
  21 public final class RefreshScopeVariable extends ExternalToolVariable {
  22         private static final DefaultResourceExpander defaultExpander = new DefaultResourceExpander();
  23
  24         private IVariableResourceExpander expander = null;
  25
  26         /**
  27          * Creates a refresh scope variable
  28          *
  29          * @param tag
  30          *            the variable tag
  31          * @param description
  32          *            a short description of what the variable will expand to
  33          * @param element
  34          *            the configuration element
  35          */
  36         /* package */RefreshScopeVariable(String tag, String description,
  37                         IConfigurationElement element) {
  38                 super(tag, description, element);
  39         }
  40
  41         /**
  42          * Returns the object that can expand the variable as resources.
  43          */
  44         public IVariableResourceExpander getExpander() {
  45                 if (expander == null) {
  46                         expander = (IVariableResourceExpander) createObject(ExternalToolVariableRegistry.TAG_EXPANDER_CLASS);
  47                         if (expander == null)
  48                                 expander = defaultExpander;
  49                 }
  50                 return expander;
  51         }
  52
  53         /**
  54          * Default variable resource expander implementation which does not expand
  55          * variables, but just returns <code>null</code>.
  56          */
  57         private static final class DefaultResourceExpander implements
  58                         IVariableResourceExpander {
  59                 /*
  60                  * (non-Javadoc) Method declared on IVariableResourceExpander.
  61                  */
  62                 public IResource[] getResources(String varTag, String varValue,
  63                                 ExpandVariableContext context) {
  64                         return null;
  65                 }
  66         }
  67 }