net.sourceforge.phpeclipse.externaltools/src/net/sourceforge/phpdt/externaltools/internal/model/VariableContextManager.java

   1 package net.sourceforge.phpdt.externaltools.internal.model;
   2
   3 /**********************************************************************
   4 Copyright (c) 2000, 2002 IBM Corp.  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
  10 import java.util.Map;
  11
  12 import net.sourceforge.phpdt.externaltools.variable.ExpandVariableContext;
  13
  14 import org.eclipse.core.resources.IProject;
  15 import org.eclipse.core.resources.IResource;
  16 import org.eclipse.core.runtime.IAdaptable;
  17 import org.eclipse.core.runtime.IProgressMonitor;
  18 import org.eclipse.jface.viewers.ISelection;
  19 import org.eclipse.jface.viewers.IStructuredSelection;
  20 import org.eclipse.ui.IEditorInput;
  21 import org.eclipse.ui.IEditorPart;
  22 import org.eclipse.ui.ISelectionListener;
  23 import org.eclipse.ui.ISelectionService;
  24 import org.eclipse.ui.IWindowListener;
  25 import org.eclipse.ui.IWorkbench;
  26 import org.eclipse.ui.IWorkbenchPage;
  27 import org.eclipse.ui.IWorkbenchPart;
  28 import org.eclipse.ui.IWorkbenchWindow;
  29 import org.eclipse.ui.PlatformUI;
  30 import org.eclipse.ui.externaltools.internal.model.ExternalToolBuilder;
  31
  32 /**
  33  * Maintains the context used to expand variables. The context is based on
  34  * the selected resource, unless a build is in progress - in which case
  35  * the context is based on the project being built..
  36  */
  37 public class VariableContextManager implements IWindowListener, ISelectionListener {
  38
  39         // singleton
  40         private static VariableContextManager fgDefault;
  41
  42         private IResource fSelectedResource = null;
  43
  44         private boolean fBuilding = false;
  45         private IProject fProject = null;
  46         private int fKind;
  47
  48         private VariableContextManager() {
  49                 IWorkbench workbench = PlatformUI.getWorkbench();
  50                 if (workbench != null) { //may be running headless
  51                         workbench.addWindowListener(this);
  52                         IWorkbenchWindow activeWindow = workbench.getActiveWorkbenchWindow();
  53                         if (activeWindow != null) {
  54                                 windowActivated(activeWindow);
  55                         }
  56                 }
  57         }
  58
  59         /**
  60          * Returns the singleton resource selection manager
  61          *
  62          * @return VariableContextManager
  63          */
  64         public static VariableContextManager getDefault() {
  65                 if (fgDefault == null) {
  66                         fgDefault = new VariableContextManager();
  67                 }
  68                 return fgDefault;
  69         }
  70
  71         /**
  72          * @see org.eclipse.ui.IWindowListener#windowActivated(org.eclipse.ui.IWorkbenchWindow)
  73          */
  74         public void windowActivated(IWorkbenchWindow window) {
  75                 fSelectedResource = null;
  76                 ISelectionService service = window.getSelectionService();
  77                 service.addSelectionListener(this);
  78                 IWorkbenchPage page = window.getActivePage();
  79                 if (page != null) {
  80                         IWorkbenchPart part = page.getActivePart();
  81                         if (part != null) {
  82                                 ISelection selection = service.getSelection();
  83                                 if (selection != null) {
  84                                         selectionChanged(part, selection);
  85                                 }
  86                         }
  87                 }
  88         }
  89
  90         /**
  91          * @see org.eclipse.ui.IWindowListener#windowClosed(org.eclipse.ui.IWorkbenchWindow)
  92          */
  93         public void windowClosed(IWorkbenchWindow window) {
  94                 window.getSelectionService().removeSelectionListener(this);
  95         }
  96
  97         /**
  98          * @see org.eclipse.ui.IWindowListener#windowDeactivated(org.eclipse.ui.IWorkbenchWindow)
  99          */
 100         public void windowDeactivated(IWorkbenchWindow window) {
 101                 window.getSelectionService().removeSelectionListener(this);
 102         }
 103
 104         /**
 105          * @see org.eclipse.ui.IWindowListener#windowOpened(org.eclipse.ui.IWorkbenchWindow)
 106          */
 107         public void windowOpened(IWorkbenchWindow window) {
 108         }
 109
 110         /**
 111          * @see org.eclipse.ui.ISelectionListener#selectionChanged(org.eclipse.ui.IWorkbenchPart, org.eclipse.jface.viewers.ISelection)
 112          */
 113         public void selectionChanged(IWorkbenchPart part, ISelection selection) {
 114                 IResource selectedResource = null;
 115                 if (selection instanceof IStructuredSelection) {
 116                         Object result = ((IStructuredSelection)selection).getFirstElement();
 117                         if (result instanceof IResource) {
 118                                 selectedResource = (IResource) result;
 119                         } else if (result instanceof IAdaptable) {
 120                                 selectedResource = (IResource)((IAdaptable) result).getAdapter(IResource.class);
 121                         }
 122                 }
 123
 124                 if (selectedResource == null) {
 125                         // If the active part is an editor, get the file resource used as input.
 126                         if (part instanceof IEditorPart) {
 127                                 IEditorPart editorPart = (IEditorPart) part;
 128                                 IEditorInput input = editorPart.getEditorInput();
 129                                 selectedResource = (IResource) input.getAdapter(IResource.class);
 130                         }
 131                 }
 132
 133                 fSelectedResource = selectedResource;
 134         }
 135
 136         /**
 137          * Returns the active variable context. The context is that of the selected
 138          * resource, or a project being built.
 139          *
 140          * @return variable context
 141          */
 142         public ExpandVariableContext getVariableContext() {
 143                 if (fBuilding) {
 144                         return new ExpandVariableContext(fProject, fKind);
 145                 } else {
 146                         return new ExpandVariableContext(fSelectedResource);
 147                 }
 148         }
 149
 150         /**
 151          * Notification that the given project is being built.
 152          *
 153          * @param project
 154          * @param kind
 155          * @see ExternalToolBuilder#build(int, Map, IProgressMonitor)
 156          */
 157         public void buildStarted(IProject project, int kind) {
 158                 fBuilding = true;
 159                 fProject = project;
 160                 fKind = kind;
 161         }
 162
 163         /**
 164          * Notification the building the current project has completed.
 165          * @see ExternalToolBuilder#build(int, Map, IProgressMonitor)
 166          */
 167         public void buildEnded() {
 168                 fBuilding = false;
 169                 fProject= null;
 170         }
 171 }