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   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 the
  34  * selected resource, unless a build is in progress - in which case the context
  35  * is based on the project being built..
  36  */
  37 public class VariableContextManager implements IWindowListener,
  38                 ISelectionListener {
  39
  40         // singleton
  41         private static VariableContextManager fgDefault;
  42
  43         private IResource fSelectedResource = null;
  44
  45         private boolean fBuilding = false;
  46
  47         private IProject fProject = null;
  48
  49         private int fKind;
  50
  51         private VariableContextManager() {
  52                 IWorkbench workbench = PlatformUI.getWorkbench();
  53                 if (workbench != null) { // may be running headless
  54                         workbench.addWindowListener(this);
  55                         IWorkbenchWindow activeWindow = workbench
  56                                         .getActiveWorkbenchWindow();
  57                         if (activeWindow != null) {
  58                                 windowActivated(activeWindow);
  59                         }
  60                 }
  61         }
  62
  63         /**
  64          * Returns the singleton resource selection manager
  65          *
  66          * @return VariableContextManager
  67          */
  68         public static VariableContextManager getDefault() {
  69                 if (fgDefault == null) {
  70                         fgDefault = new VariableContextManager();
  71                 }
  72                 return fgDefault;
  73         }
  74
  75         /**
  76          * @see org.eclipse.ui.IWindowListener#windowActivated(org.eclipse.ui.IWorkbenchWindow)
  77          */
  78         public void windowActivated(IWorkbenchWindow window) {
  79                 fSelectedResource = null;
  80                 ISelectionService service = window.getSelectionService();
  81                 service.addSelectionListener(this);
  82                 IWorkbenchPage page = window.getActivePage();
  83                 if (page != null) {
  84                         IWorkbenchPart part = page.getActivePart();
  85                         if (part != null) {
  86                                 ISelection selection = service.getSelection();
  87                                 if (selection != null) {
  88                                         selectionChanged(part, selection);
  89                                 }
  90                         }
  91                 }
  92         }
  93
  94         /**
  95          * @see org.eclipse.ui.IWindowListener#windowClosed(org.eclipse.ui.IWorkbenchWindow)
  96          */
  97         public void windowClosed(IWorkbenchWindow window) {
  98                 window.getSelectionService().removeSelectionListener(this);
  99         }
 100
 101         /**
 102          * @see org.eclipse.ui.IWindowListener#windowDeactivated(org.eclipse.ui.IWorkbenchWindow)
 103          */
 104         public void windowDeactivated(IWorkbenchWindow window) {
 105                 window.getSelectionService().removeSelectionListener(this);
 106         }
 107
 108         /**
 109          * @see org.eclipse.ui.IWindowListener#windowOpened(org.eclipse.ui.IWorkbenchWindow)
 110          */
 111         public void windowOpened(IWorkbenchWindow window) {
 112         }
 113
 114         /**
 115          * @see org.eclipse.ui.ISelectionListener#selectionChanged(org.eclipse.ui.IWorkbenchPart,
 116          *      org.eclipse.jface.viewers.ISelection)
 117          */
 118         public void selectionChanged(IWorkbenchPart part, ISelection selection) {
 119                 IResource selectedResource = null;
 120                 if (selection instanceof IStructuredSelection) {
 121                         Object result = ((IStructuredSelection) selection)
 122                                         .getFirstElement();
 123                         if (result instanceof IResource) {
 124                                 selectedResource = (IResource) result;
 125                         } else if (result instanceof IAdaptable) {
 126                                 selectedResource = (IResource) ((IAdaptable) result)
 127                                                 .getAdapter(IResource.class);
 128                         }
 129                 }
 130
 131                 if (selectedResource == null) {
 132                         // If the active part is an editor, get the file resource used as
 133                         // input.
 134                         if (part instanceof IEditorPart) {
 135                                 IEditorPart editorPart = (IEditorPart) part;
 136                                 IEditorInput input = editorPart.getEditorInput();
 137                                 selectedResource = (IResource) input
 138                                                 .getAdapter(IResource.class);
 139                         }
 140                 }
 141
 142                 fSelectedResource = selectedResource;
 143         }
 144
 145         /**
 146          * Returns the active variable context. The context is that of the selected
 147          * resource, or a project being built.
 148          *
 149          * @return variable context
 150          */
 151         public ExpandVariableContext getVariableContext() {
 152                 if (fBuilding) {
 153                         return new ExpandVariableContext(fProject, fKind);
 154                 } else {
 155                         return new ExpandVariableContext(fSelectedResource);
 156                 }
 157         }
 158
 159         /**
 160          * Notification that the given project is being built.
 161          *
 162          * @param project
 163          * @param kind
 164          * @see ExternalToolBuilder#build(int, Map, IProgressMonitor)
 165          */
 166         public void buildStarted(IProject project, int kind) {
 167                 fBuilding = true;
 168                 fProject = project;
 169                 fKind = kind;
 170         }
 171
 172         /**
 173          * Notification the building the current project has completed.
 174          *
 175          * @see ExternalToolBuilder#build(int, Map, IProgressMonitor)
 176          */
 177         public void buildEnded() {
 178                 fBuilding = false;
 179                 fProject = null;
 180         }
 181 }