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.text.java;
  
  
  
  import org.eclipse.jface.resource.ImageDescriptor;
  import org.eclipse.jface.text.contentassist.IContextInformation;
  import org.eclipse.jface.text.contentassist.IContextInformationExtension;
  import org.eclipse.swt.graphics.Image;
  import org.eclipse.wst.jsdt.core.CompletionProposal;
  import org.eclipse.wst.jsdt.internal.ui.JavaScriptPlugin;
  import org.eclipse.wst.jsdt.ui.text.java.CompletionProposalLabelProvider;
  
  
  /**
   * Implementation of the <code>IContextInformation</code> interface.
   */
  public final class ProposalContextInformation implements IContextInformation, IContextInformationExtension {
  
  	private final String fContextDisplayString;
  	private final String fInformationDisplayString;
  	private final Image fImage;
  	private int fPosition;
  
  	/**
  	 * Creates a new context information.
  	 */
  	public ProposalContextInformation(CompletionProposal proposal) {
  		// don't cache the core proposal because the ContentAssistant might
  		// hang on to the context info.
  		CompletionProposalLabelProvider labelProvider= new CompletionProposalLabelProvider();
  		fInformationDisplayString= labelProvider.createParameterList(proposal);
  		ImageDescriptor descriptor= labelProvider.createImageDescriptor(proposal);
  		if (descriptor != null)
  			fImage= JavaScriptPlugin.getImageDescriptorRegistry().get(descriptor);
  		else
  			fImage= null;
  		if (proposal.getCompletion().length == 0)
  			fPosition= proposal.getCompletionLocation() + 1;
  		else
  			fPosition= -1;
  		fContextDisplayString= labelProvider.createLabel(proposal);
  	}
  
  	/*
  	 * @see IContextInformation#equals
  	 */
  	public boolean equals(Object object) {
  		if (object instanceof IContextInformation) {
  			IContextInformation contextInformation= (IContextInformation) object;
  			boolean equals= getInformationDisplayString().equalsIgnoreCase(contextInformation.getInformationDisplayString());
  			if (getContextDisplayString() != null)
  				equals= equals && getContextDisplayString().equalsIgnoreCase(contextInformation.getContextDisplayString());
  			return equals;
  		}
  		return false;
  	}
  
  	/*
  	 * @see IContextInformation#getInformationDisplayString()
  	 */
  	public String getInformationDisplayString() {
  		return fInformationDisplayString;
  	}
  
  	/*
  	 * @see IContextInformation#getImage()
  	 */
  	public Image getImage() {
  		return fImage;
  	}
  
  	/*
  	 * @see IContextInformation#getContextDisplayString()
  	 */
  	public String getContextDisplayString() {
  		return fContextDisplayString;
  	}
  
  	/*
  	 * @see IContextInformationExtension#getContextInformationPosition()
  	 */
  	public int getContextInformationPosition() {
  		return fPosition;
  	}
  	
  	/**
  	 * Sets the context information position.
  	 * 
  	 * @param position the new position, or -1 for unknown.
  	 * 
  	 */
  	public void setContextInformationPosition(int position) {
  		fPosition= position;
  	}
  }
  