content: /*******************************************************************************
   * Copyright (c) 2000, 2008 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:
   *     IBM Corporation - initial API and implementation
   *******************************************************************************/
  
  package org.eclipse.wst.jsdt.internal.ui.javaeditor;
  
  import org.eclipse.jface.text.IRegion;
  import org.eclipse.jface.text.ITextViewer;
  import org.eclipse.jface.text.Region;
  import org.eclipse.jface.text.hyperlink.AbstractHyperlinkDetector;
  import org.eclipse.jface.text.hyperlink.IHyperlink;
  import org.eclipse.ui.IEditorInput;
  import org.eclipse.ui.IEditorSite;
  import org.eclipse.ui.texteditor.ITextEditor;
  import org.eclipse.wst.jsdt.core.IJavaScriptElement;
  import org.eclipse.wst.jsdt.core.dom.ASTNode;
  import org.eclipse.wst.jsdt.core.dom.JavaScriptUnit;
  import org.eclipse.wst.jsdt.core.dom.QualifiedName;
  import org.eclipse.wst.jsdt.core.dom.SimpleName;
  import org.eclipse.wst.jsdt.core.dom.StringLiteral;
  import org.eclipse.wst.jsdt.internal.corext.dom.NodeFinder;
  import org.eclipse.wst.jsdt.internal.corext.refactoring.nls.AccessorClassReference;
  import org.eclipse.wst.jsdt.internal.corext.refactoring.nls.NLSHintHelper;
  import org.eclipse.wst.jsdt.internal.ui.JavaScriptPlugin;
  
  
  /**
   * NLS hyperlink detector.
   *
   * 
   */
  public class NLSKeyHyperlinkDetector extends AbstractHyperlinkDetector {
  
  
  	/*
  	 * @see org.eclipse.jface.text.hyperlink.IHyperlinkDetector#detectHyperlinks(org.eclipse.jface.text.ITextViewer, org.eclipse.jface.text.IRegion, boolean)
  	 */
  	public IHyperlink[] detectHyperlinks(ITextViewer textViewer, IRegion region, boolean canShowMultipleHyperlinks) {
  		ITextEditor textEditor= (ITextEditor)getAdapter(ITextEditor.class);
  		if (region == null || textEditor == null || canShowMultipleHyperlinks)
  			return null;
  
  		IEditorSite site= textEditor.getEditorSite();
  		if (site == null)
  			return null;
  
  		IJavaScriptElement javaElement= getInputJavaElement(textEditor);
  		if (javaElement == null)
  			return null;
  
  		JavaScriptUnit ast= JavaScriptPlugin.getDefault().getASTProvider().getAST(javaElement, ASTProvider.WAIT_NO, null);
  		if (ast == null)
  			return null;
  
  		ASTNode node= NodeFinder.perform(ast, region.getOffset(), 1);
  		if (!(node instanceof StringLiteral)  && !(node instanceof SimpleName))
  			return null;
  		
  		if (node.getLocationInParent() == QualifiedName.QUALIFIER_PROPERTY)
  			return null;
  
  		IRegion nlsKeyRegion= new Region(node.getStartPosition(), node.getLength());
  		AccessorClassReference ref= NLSHintHelper.getAccessorClassReference(ast, nlsKeyRegion);
  		if (ref == null)
  			return null;
  		String keyName= null;
  		if (node instanceof StringLiteral) {
  			keyName= ((StringLiteral)node).getLiteralValue();
  		} else {
  			keyName= ((SimpleName)node).getIdentifier();
  		}
  		if (keyName != null)
  			return new IHyperlink[] {new NLSKeyHyperlink(nlsKeyRegion, keyName, ref, textEditor)};
  
  		return null;
  	}
  
  	private IJavaScriptElement getInputJavaElement(ITextEditor editor) {
  		IEditorInput editorInput= editor.getEditorInput();
  		if (editorInput instanceof IClassFileEditorInput)
  			return ((IClassFileEditorInput)editorInput).getClassFile();
  
  		if (editor instanceof CompilationUnitEditor)
  			return JavaScriptPlugin.getDefault().getWorkingCopyManager().getWorkingCopy(editorInput);
  
  		return null;
  	}
  
  }
  