content: /*******************************************************************************
   * Copyright (c) 2000, 2007 IBM Corporation and others.
   * All rights reserved. This program and the accompanying materials
   * are made available under the terms of the Eclipse Public License v1.0
   * which accompanies this distribution, and is available at
   * http://www.eclipse.org/legal/epl-v10.html
   *
   * Contributors:
   *   Jesper Kamstrup Linnet (eclipse@kamstrup-linnet.dk) - initial API and implementation
   *          (report 36180: Callers/Callees view)
   *******************************************************************************/
  package org.eclipse.wst.jsdt.internal.ui.callhierarchy;
  
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.PrintWriter;
  import java.io.StringReader;
  import java.io.StringWriter;
  
  import org.eclipse.core.runtime.Assert;
  import org.eclipse.jface.action.Action;
  import org.eclipse.jface.dialogs.MessageDialog;
  import org.eclipse.jface.viewers.ISelection;
  import org.eclipse.jface.viewers.ISelectionProvider;
  import org.eclipse.swt.SWTError;
  import org.eclipse.swt.dnd.Clipboard;
  import org.eclipse.swt.dnd.DND;
  import org.eclipse.swt.dnd.TextTransfer;
  import org.eclipse.swt.dnd.Transfer;
  import org.eclipse.swt.widgets.TreeItem;
  import org.eclipse.ui.PlatformUI;
  import org.eclipse.wst.jsdt.internal.ui.IJavaHelpContextIds;
  import org.eclipse.wst.jsdt.internal.ui.util.SelectionUtil;
  
  class CopyCallHierarchyAction extends Action {
      private static final char INDENTATION= '\t';  
      
      private CallHierarchyViewPart fView;
      private CallHierarchyViewer fViewer;
  	
  	private final Clipboard fClipboard;
  
  	public CopyCallHierarchyAction(CallHierarchyViewPart view, Clipboard clipboard, CallHierarchyViewer viewer) {
  		super(CallHierarchyMessages.CopyCallHierarchyAction_label);  
  		Assert.isNotNull(clipboard);
  		PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.CALL_HIERARCHY_COPY_ACTION);
  		fView= view;
  		fClipboard= clipboard;
          fViewer= viewer;
  	}
  
      public boolean canActionBeAdded() {
          Object element = SelectionUtil.getSingleElement(getSelection());
          return element != null;
      }
      
      private ISelection getSelection() {
          ISelectionProvider provider = fView.getSite().getSelectionProvider();
  
          if (provider != null) {
              return provider.getSelection();
          }
  
          return null;
      }
      
  	/*
  	 * @see IAction#run()
  	 */
  	public void run() {
          StringBuffer buf= new StringBuffer();
          addCalls(fViewer.getTree().getSelection()[0], 0, buf);
  
  		TextTransfer plainTextTransfer = TextTransfer.getInstance();
  		try{
  			fClipboard.setContents(
  				new String[]{ convertLineTerminators(buf.toString()) }, 
  				new Transfer[]{ plainTextTransfer });
  		}  catch (SWTError e){
  			if (e.code != DND.ERROR_CANNOT_SET_CLIPBOARD) 
  				throw e;
  			if (MessageDialog.openQuestion(fView.getViewSite().getShell(), CallHierarchyMessages.CopyCallHierarchyAction_problem, CallHierarchyMessages.CopyCallHierarchyAction_clipboard_busy))  
  				run();
  		}
  	}
  	
  	/**
       * Adds the specified TreeItem's text to the StringBuffer
       * 
       * @param item
       * @param buf
       */
      private void addCalls(TreeItem item, int indent, StringBuffer buf) {
          for (int i= 0; i < indent; i++) {
              buf.append(INDENTATION);
          }
  
          buf.append(item.getText());
          buf.append('\n');
          
          if (item.getExpanded()) {
              TreeItem[] items= item.getItems();
              for (int i= 0; i < items.length; i++) {
                  addCalls(items[i], indent + 1, buf);
              }
          }        
      }
  
      static String convertLineTerminators(String in) {
  		StringWriter stringWriter= new StringWriter();
  		PrintWriter printWriter= new PrintWriter(stringWriter);
  		StringReader stringReader= new StringReader(in);
  		BufferedReader bufferedReader= new BufferedReader(stringReader);		
  		try {
  			String line= bufferedReader.readLine();
  			while (line != null) {
  				printWriter.print(line);
  				line= bufferedReader.readLine();
  				if (line != null && line.length() != 0)
  					printWriter.println();
  					
  			}
  		} catch (IOException e) {
  			return in; // return the call hierarchy unfiltered
  		}
  		return stringWriter.toString();
  	}
  }
  