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 java.util.LinkedList;
  import java.util.Map;
  
  import org.eclipse.jface.text.BadLocationException;
  import org.eclipse.jface.text.IDocument;
  import org.eclipse.jface.text.TextUtilities;
  import org.eclipse.jface.text.TypedPosition;
  import org.eclipse.jface.text.formatter.ContextBasedFormattingStrategy;
  import org.eclipse.jface.text.formatter.FormattingContextProperties;
  import org.eclipse.jface.text.formatter.IFormattingContext;
  import org.eclipse.text.edits.MalformedTreeException;
  import org.eclipse.text.edits.TextEdit;
  import org.eclipse.wst.jsdt.core.formatter.CodeFormatter;
  import org.eclipse.wst.jsdt.internal.corext.util.CodeFormatterUtil;
  import org.eclipse.wst.jsdt.internal.ui.JavaScriptPlugin;
  
  /**
   * Formatting strategy for java source code.
   *
   * 
   */
  public class JavaFormattingStrategy extends ContextBasedFormattingStrategy {
  
  	/** Documents to be formatted by this strategy */
  	private final LinkedList fDocuments= new LinkedList();
  	/** Partitions to be formatted by this strategy */
  	private final LinkedList fPartitions= new LinkedList();
  
  	/**
  	 * Creates a new java formatting strategy.
   	 */
  	public JavaFormattingStrategy() {
  		super();
  	}
  
  	/*
  	 * @see org.eclipse.jface.text.formatter.ContextBasedFormattingStrategy#format()
  	 */
  	public void format() {
  		super.format();
  
  		final IDocument document= (IDocument)fDocuments.removeFirst();
  		final TypedPosition partition= (TypedPosition)fPartitions.removeFirst();
  
  		if (document != null && partition != null) {
  			Map partitioners= null;
  			try {
  
  				final TextEdit edit= CodeFormatterUtil.reformat(CodeFormatter.K_JAVASCRIPT_UNIT, document.get(), partition.getOffset(), partition.getLength(), 0, TextUtilities.getDefaultLineDelimiter(document), getPreferences());
  				if (edit != null) {
  					if (edit.getChildrenSize() > 20)
  						partitioners= TextUtilities.removeDocumentPartitioners(document);
  
  					edit.apply(document);
  				}
  
  			} catch (MalformedTreeException exception) {
  				JavaScriptPlugin.log(exception);
  			} catch (BadLocationException exception) {
  				// Can only happen on concurrent document modification - log and bail out
  				JavaScriptPlugin.log(exception);
  			} finally {
  				if (partitioners != null)
  					TextUtilities.addDocumentPartitioners(document, partitioners);
  			}
  		}
   	}
  
  	/*
  	 * @see org.eclipse.jface.text.formatter.ContextBasedFormattingStrategy#formatterStarts(org.eclipse.jface.text.formatter.IFormattingContext)
  	 */
  	public void formatterStarts(final IFormattingContext context) {
  		super.formatterStarts(context);
  
  		fPartitions.addLast(context.getProperty(FormattingContextProperties.CONTEXT_PARTITION));
  		fDocuments.addLast(context.getProperty(FormattingContextProperties.CONTEXT_MEDIUM));
  	}
  
  	/*
  	 * @see org.eclipse.jface.text.formatter.ContextBasedFormattingStrategy#formatterStops()
  	 */
  	public void formatterStops() {
  		super.formatterStops();
  
  		fPartitions.clear();
  		fDocuments.clear();
  	}
  }
  