content: /*******************************************************************************
   * Copyright (c) 2005, 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.text.java;
  
  import org.eclipse.jface.text.IDocument;
  import org.eclipse.wst.jsdt.core.CompletionProposal;
  import org.eclipse.wst.jsdt.internal.ui.text.JavaHeuristicScanner;
  import org.eclipse.wst.jsdt.internal.ui.text.Symbols;
  import org.eclipse.wst.jsdt.ui.text.java.CompletionProposalCollector;
  import org.eclipse.wst.jsdt.ui.text.java.ContentAssistInvocationContext;
  import org.eclipse.wst.jsdt.ui.text.java.JavaContentAssistInvocationContext;
  
  /**
   * 
   * 
   */
  public class JavaNoTypeCompletionProposalComputer extends JavaCompletionProposalComputer {
  	/*
  	 * @see org.eclipse.wst.jsdt.internal.ui.text.java.JavaCompletionProposalComputer#createCollector(org.eclipse.wst.jsdt.ui.text.java.JavaContentAssistInvocationContext)
  	 */
  	protected CompletionProposalCollector createCollector(JavaContentAssistInvocationContext context) {
  		CompletionProposalCollector collector= super.createCollector(context);
  		collector.setIgnored(CompletionProposal.ANONYMOUS_CLASS_DECLARATION, false);
  		collector.setIgnored(CompletionProposal.FIELD_REF, false);
  		collector.setIgnored(CompletionProposal.KEYWORD, false);
  		collector.setIgnored(CompletionProposal.LABEL_REF, false);
  		collector.setIgnored(CompletionProposal.LOCAL_VARIABLE_REF, false);
  		collector.setIgnored(CompletionProposal.METHOD_DECLARATION, false);
  		collector.setIgnored(CompletionProposal.METHOD_NAME_REFERENCE, false);
  		collector.setIgnored(CompletionProposal.METHOD_REF, false);
  		collector.setIgnored(CompletionProposal.PACKAGE_REF, true);
  		collector.setIgnored(CompletionProposal.POTENTIAL_METHOD_DECLARATION, false);
  		collector.setIgnored(CompletionProposal.VARIABLE_DECLARATION, false);
  		
  		collector.setIgnored(CompletionProposal.JSDOC_BLOCK_TAG, true);
  		collector.setIgnored(CompletionProposal.JSDOC_FIELD_REF, true);
  		collector.setIgnored(CompletionProposal.JSDOC_INLINE_TAG, true);
  		collector.setIgnored(CompletionProposal.JSDOC_METHOD_REF, true);
  		collector.setIgnored(CompletionProposal.JSDOC_PARAM_REF, true);
  		collector.setIgnored(CompletionProposal.JSDOC_TYPE_REF, true);
  		
  		collector.setIgnored(CompletionProposal.TYPE_REF, false);
  		return collector;
  	}
  	
  	protected int guessContextInformationPosition(ContentAssistInvocationContext context) {
  		final int contextPosition= context.getInvocationOffset();
  		
  		IDocument document= context.getDocument();
  		JavaHeuristicScanner scanner= new JavaHeuristicScanner(document);
  		int bound= Math.max(-1, contextPosition - 200);
  		
  		// try the innermost scope of parentheses that looks like a method call
  		int pos= contextPosition - 1;
  		do {
  			int paren= scanner.findOpeningPeer(pos, bound, '(', ')');
  			if (paren == JavaHeuristicScanner.NOT_FOUND)
  				break;
  			int token= scanner.previousToken(paren - 1, bound);
  			// next token must be a method name (identifier) or the closing angle of a
  			// constructor call of a parameterized type.
  			if (token == Symbols.TokenIDENT || token == Symbols.TokenGREATERTHAN)
  				return paren + 1;
  			pos= paren - 1;
  		} while (true);
  		
  		return super.guessContextInformationPosition(context);
  	}
  }
  