PathCoder.java

/* ====================================================================
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 * The ObjectStyle Group Software License, Version 1.0 
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 * Copyright (c) 2004 The ObjectStyle Group 
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 *       "This product includes software developed by the 
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package org.objectstyle.wolips.jdt.classpath;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;
import org.objectstyle.wolips.jdt.JdtPlugin;

/**
 * @author ulrich
 */
public class PathCoder {

	/**
	 * @param path
	 *            Decodes paths within a path.
	 * @return
	 * @throws PathCoderException
	 */
	public static IPath[] decode(IPath path) throws PathCoderException {
		List<IPath> arrayList = new ArrayList<IPath>();
		int segmentCount = path.segmentCount();
		// if something goes wrong max 2048 runs
		for (int i = 0; i < segmentCount && i < 2048;) {
			Integer integer = null;
			try {
				String string = path.segment(i);
				integer = Integer.valueOf(string);
			} catch (NumberFormatException e) {
				JdtPlugin.getDefault().getPluginLogger().log(e);
				throw new PathCoderException();
			}
			IPath entryPath = path.removeFirstSegments(i + 1);
			entryPath = entryPath.removeLastSegments(entryPath.segmentCount() - integer.intValue());
			arrayList.add(entryPath);
			i = i + integer.intValue() + 1;
		}
		return arrayList.toArray(new IPath[arrayList.size()]);
	}

	/**
	 * @param path
	 *            Encodes paths from a path.
	 * @return
	 */
	public static IPath encode(IPath path) {
		IPath encodePath = path;
		if (path == null) {
			encodePath = new Path("nil");
		}
		IPath returnValue = new Path(encodePath.segmentCount() + "");
		returnValue = returnValue.append(encodePath);
		return returnValue;
	}
}