content: /*******************************************************************************
   * Copyright (c) 2000, 2009 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.compare;
  
  import org.eclipse.compare.ITypedElement;
  import org.eclipse.compare.structuremergeviewer.DocumentRangeNode;
  import org.eclipse.jface.resource.ImageDescriptor;
  import org.eclipse.jface.text.IDocument;
  import org.eclipse.swt.graphics.Image;
  import org.eclipse.wst.jsdt.core.IJavaScriptElement;
  import org.eclipse.wst.jsdt.internal.ui.JavaScriptPlugin;
  
  /**
   * Comparable Java elements are represented as JavaNodes.
   * Extends the DocumentRangeNode with method signature information.
   */
  public class JavaNode extends DocumentRangeNode implements ITypedElement {
  	
  	public static final int CU= 0;
  	public static final int PACKAGE= 1;
  	public static final int IMPORT_CONTAINER= 2;
  	public static final int IMPORT= 3;
  	public static final int INTERFACE= 4;
  	public static final int CLASS= 5;
  	public static final int ENUM= 6;
  	public static final int ANNOTATION= 7;
  	public static final int FIELD= 8;
  	public static final int INIT= 9;
  	public static final int CONSTRUCTOR= 10;
  	public static final int METHOD= 11;
  
  	private int fInitializerCount= 1;
  
  	/**
  	 * Creates a JavaNode under the given parent.
  	 * @param parent the parent node
  	 * @param type the Java elements type. Legal values are from the range CU to METHOD of this class.
  	 * @param name the name of the Java element
  	 * @param start the starting position of the java element in the underlying document
  	 * @param length the number of characters of the java element in the underlying document
  	 */
  	public JavaNode(JavaNode parent, int type, String name, int start, int length) {
  		super(parent, type, JavaCompareUtilities.buildID(type, name), parent.getDocument(), start, length);
  		parent.addChild(this);
  	}	
  	
  	/**
  	 * Creates a JavaNode for a CU. It represents the root of a
  	 * JavaNode tree, so its parent is null.
  	 * @param document the document which contains the Java element
  	 */
  	public JavaNode(IDocument document) {
  		super(CU, JavaCompareUtilities.buildID(CU, "root"), document, 0, document.getLength()); //$NON-NLS-1$
  	}	
  
  	public String getInitializerCount() {
  		return Integer.toString(fInitializerCount++);
  	}
  	
  	/**
  	 * Extracts the method name from the signature.
  	 * Used for smart matching.
  	 */
  	public String extractMethodName() {
  		String id= getId();
  		int pos= id.indexOf('(');
  		if (pos > 0)
  			return id.substring(1, pos);
  		return id.substring(1);
  	}
  	
  	/**
  	 * Extracts the method's arguments name the signature.
  	 * Used for smart matching.
  	 */
  	public String extractArgumentList() {
  		String id= getId();
  		int pos= id.indexOf('(');
  		if (pos >= 0)
  			return id.substring(pos+1);
  		return id.substring(1);
  	}
  	
  	/**
  	 * Returns a name which is presented in the UI.
  	 * @see ITypedElement#getName()
  	 */
  	public String getName() {
  		
  		switch (getTypeCode()) {
  		case INIT:
  			return CompareMessages.JavaNode_initializer; 
  		case IMPORT_CONTAINER:
  			return CompareMessages.JavaNode_importDeclarations; 
  		case CU:
  			return CompareMessages.JavaNode_compilationUnit; 
  		case PACKAGE:
  			return CompareMessages.JavaNode_packageDeclaration; 
  		}
  		return getId().substring(1);	// we strip away the type character
  	}
  	
  	/*
  	 * @see ITypedElement#getType()
  	 */
  	public String getType() {
  		return "java2"; //$NON-NLS-1$
  	}
  		
  	/**
  	 * Returns a shared image for this Java element.
  	 *
  	 * see ITypedInput.getImage
  	 */
  	public Image getImage() {
  						
  		ImageDescriptor id= null;
  					
  		switch (getTypeCode()) {
  		case CU:
  			id= JavaCompareUtilities.getImageDescriptor(IJavaScriptElement.JAVASCRIPT_UNIT);
  			break;
  		case IMPORT:
  			id= JavaCompareUtilities.getImageDescriptor(IJavaScriptElement.IMPORT_DECLARATION);
  			break;
  		case IMPORT_CONTAINER:
  			id= JavaCompareUtilities.getImageDescriptor(IJavaScriptElement.IMPORT_CONTAINER);
  			break;
  		case CLASS:
  			id= JavaCompareUtilities.getTypeImageDescriptor(true);
  			break;
  		case INTERFACE:
  			id= JavaCompareUtilities.getTypeImageDescriptor(false);
  			break;
  		case INIT:
  			id= JavaCompareUtilities.getImageDescriptor(IJavaScriptElement.INITIALIZER);
  			break;
  		case CONSTRUCTOR:
  		case METHOD:
  			id= JavaCompareUtilities.getImageDescriptor(IJavaScriptElement.METHOD);
  			break;
  		case FIELD:
  			id= JavaCompareUtilities.getImageDescriptor(IJavaScriptElement.FIELD);
  			break;					
  		case ENUM:
  			id= JavaCompareUtilities.getEnumImageDescriptor();
  			break;
  		case ANNOTATION:
  			id= JavaCompareUtilities.getAnnotationImageDescriptor();
  			break;
  		}
  		return JavaScriptPlugin.getImageDescriptorRegistry().get(id);
  	}
  	
  	/*
  	 * @see java.lang.Object#toString()
  	 */
  	public String toString() {
  		return getType() + ": " + getName() //$NON-NLS-1$
  				+ "[" + getRange().offset + "+" + getRange().length + "]"; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
  	}
  }
  
  