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.corext.fix;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import org.eclipse.core.runtime.CoreException;
  import org.eclipse.jface.resource.ImageDescriptor;
  import org.eclipse.jface.text.link.LinkedModeModel;
  import org.eclipse.jface.text.link.LinkedPosition;
  import org.eclipse.swt.graphics.Image;
  import org.eclipse.text.edits.MultiTextEdit;
  import org.eclipse.text.edits.ReplaceEdit;
  import org.eclipse.text.edits.TextEdit;
  import org.eclipse.wst.jsdt.core.IJavaScriptUnit;
  import org.eclipse.wst.jsdt.core.dom.ITypeBinding;
  import org.eclipse.wst.jsdt.core.dom.rewrite.ITrackedNodePosition;
  import org.eclipse.wst.jsdt.core.dom.rewrite.ImportRewrite;
  import org.eclipse.wst.jsdt.internal.corext.codemanipulation.StubUtility;
  import org.eclipse.wst.jsdt.internal.ui.JavaScriptPlugin;
  import org.eclipse.wst.jsdt.internal.ui.viewsupport.BindingLabelProvider;
  import org.eclipse.wst.jsdt.ui.JavaScriptElementLabels;
  
  public class LinkedProposalPositionGroup {
  	
  	/**
  	 * {@link LinkedProposalPositionGroup.PositionInformation} describes a position
  	 * insinde a position group. The information provided must be accurate
  	 * after the document change to the proposal has been performed, but doesn't
  	 * need to reflect the changed done by the linking mode.
  	 */
  	public static abstract class PositionInformation {
  		public abstract int getOffset();
  		public abstract int getLength();
  		public abstract int getSequenceRank();
  	}
  	
  	public static class Proposal {
  		
  		private String fDisplayString;
  		private Image fImage;
  		private int fRelevance;
  
  		public Proposal(String displayString, Image image, int relevance) {
  			fDisplayString= displayString;
  			fImage= image;
  			fRelevance= relevance;
  		}
  		
  		public String getDisplayString() {
  			return fDisplayString;
  		}
  		
  		public Image getImage() {
  			return fImage;
  		}
  		
  		public int getRelevance() {
  			return fRelevance;
  		}
  				
  		public void setImage(Image image) {
  			fImage= image;
  		}
  		
  		public String getAdditionalProposalInfo() {
  			return null;
  		}
  				
  		public TextEdit computeEdits(int offset, LinkedPosition position, char trigger, int stateMask, LinkedModeModel model) throws CoreException {
  			return new ReplaceEdit(position.getOffset(), position.getLength(), fDisplayString);
  		}
  	}	
  	
  	public static PositionInformation createPositionInformation(ITrackedNodePosition pos, boolean isFirst) {
  		return new TrackedNodePosition(pos, isFirst);
  	}
  	
  	private static class TrackedNodePosition extends PositionInformation {
  		
  		private final ITrackedNodePosition fPos;
  		private final boolean fIsFirst;
  		
  		public TrackedNodePosition(ITrackedNodePosition pos, boolean isFirst) {
  			fPos= pos;
  			fIsFirst= isFirst;
  		}
  
  		public int getOffset() {
  			return fPos.getStartPosition();
  		}
  		
  		public int getLength() {
  			return fPos.getLength();
  		}
  		
  		public int getSequenceRank() {
  			return fIsFirst ? 0 : 1;
  		}
  	}
  	
  	private static final class JavaLinkedModeProposal extends Proposal {
  		private final ITypeBinding fTypeProposal;
  		private final IJavaScriptUnit fCompilationUnit;
  
  		public JavaLinkedModeProposal(IJavaScriptUnit unit, ITypeBinding typeProposal, int relevance) {
  			super(BindingLabelProvider.getBindingLabel(typeProposal, JavaScriptElementLabels.ALL_DEFAULT | JavaScriptElementLabels.ALL_POST_QUALIFIED), null, relevance);
  			fTypeProposal= typeProposal;
  			fCompilationUnit= unit;
  			ImageDescriptor desc= BindingLabelProvider.getBindingImageDescriptor(fTypeProposal, BindingLabelProvider.DEFAULT_IMAGEFLAGS);
  			if (desc != null) {
  				setImage(JavaScriptPlugin.getImageDescriptorRegistry().get(desc));
  			}
  		}
  
  		/* (non-Javadoc)
  		 * @see org.eclipse.wst.jsdt.internal.corext.fix.PositionGroup.Proposal#computeEdits(int, org.eclipse.jface.text.link.LinkedPosition, char, int, org.eclipse.jface.text.link.LinkedModeModel)
  		 */
  		public TextEdit computeEdits(int offset, LinkedPosition position, char trigger, int stateMask, LinkedModeModel model) throws CoreException {
  			ImportRewrite impRewrite= StubUtility.createImportRewrite(fCompilationUnit, true);
  			String replaceString= impRewrite.addImport(fTypeProposal);
  				
  			MultiTextEdit composedEdit= new MultiTextEdit();
  			composedEdit.addChild(new ReplaceEdit(position.getOffset(), position.getLength(), replaceString));
  			composedEdit.addChild(impRewrite.rewriteImports(null));
  			return composedEdit;
  		}
  	}
  		
  
  	private final String fGroupId;
  	private final List/*<Position>*/ fPositions;
  	private final List/*<Proposal>*/ fProposals;
  	
  
  	public LinkedProposalPositionGroup(String groupID) {
  		fGroupId= groupID;
  		fPositions= new ArrayList();
  		fProposals= new ArrayList();
  	}
  	
  	public void addPosition(PositionInformation position) {
  		fPositions.add(position);
  	}
  	
  	public void addProposal(Proposal proposal) {
  		fProposals.add(proposal);
  	}
  	
  	
  	public void addPosition(ITrackedNodePosition position, boolean isFirst) {
  		addPosition(createPositionInformation(position, isFirst));
  	}
  	
  	public void addProposal(String displayString, Image image, int relevance) {
  		addProposal(new Proposal(displayString, image, relevance));
  	}
  	
  	public void addProposal(ITypeBinding type, IJavaScriptUnit cu, int relevance) {
  		addProposal(new JavaLinkedModeProposal(cu, type, relevance));
  	}
  	
  	public String getGroupId() {
  		return fGroupId;
  	}
  
  	public PositionInformation[] getPositions() {
  		return (PositionInformation[])fPositions.toArray(new PositionInformation[fPositions.size()]);
  	}
  
  	public Proposal[] getProposals() {
  		return (Proposal[])fProposals.toArray(new Proposal[fProposals.size()]);
  	}
  	
  }
  