/*******************************************************************************
 * Copyright (c) 2001, 2004 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
 *     Jens Lukowski/Innoopract - initial renaming/restructuring
 *     
 *******************************************************************************/
package org.eclipse.wst.sse.ui.internal.format;

import java.io.IOException;
import java.util.LinkedList;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
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.wst.sse.core.internal.format.IStructuredFormatProcessor;
import org.eclipse.wst.sse.core.internal.provisional.exceptions.SourceEditingRuntimeException;


public class StructuredFormattingStrategy extends ContextBasedFormattingStrategy {

	/** Documents to be formatted by this strategy */
	private final LinkedList fDocuments = new LinkedList();
	private IStructuredFormatProcessor fFormatProcessor;
	/** Partitions to be formatted by this strategy */
	private final LinkedList fPartitions = new LinkedList();
	private IRegion fRegion;

	/**
	 * @param formatProcessor
	 */
	public StructuredFormattingStrategy(IStructuredFormatProcessor formatProcessor) {
		super();

		fFormatProcessor = formatProcessor;
	}

	/*
	 * @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 && fRegion != null && fFormatProcessor != null) {
			try {
				fFormatProcessor.formatDocument(document, fRegion.getOffset(), fRegion.getLength());
			} catch (IOException e) {
				throw new SourceEditingRuntimeException(e);
			} catch (CoreException e) {
				throw new SourceEditingRuntimeException(e);
			}
		}
	}

	/*
	 * @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));
		fRegion = (IRegion) context.getProperty(FormattingContextProperties.CONTEXT_REGION);
	}

	/*
	 * @see org.eclipse.jface.text.formatter.ContextBasedFormattingStrategy#formatterStops()
	 */
	public void formatterStops() {
		super.formatterStops();

		fPartitions.clear();
		fDocuments.clear();
	}
}