core/plugins/org.eclipse.dltk.launching/src/org/eclipse/dltk/internal/launching/CompositeId.java

/*******************************************************************************
 * Copyright (c) 2000, 2016 IBM Corporation and others.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 * 
 * SPDX-License-Identifier: EPL-2.0
 *
 *******************************************************************************/
package org.eclipse.dltk.internal.launching;

import java.util.ArrayList;

/**
 * Utility class for id's made of multiple Strings
 */
public class CompositeId {
	private String[] fParts;

	public CompositeId(String[] parts) {
		fParts = parts;
	}

	public static CompositeId fromString(String idString) {
		ArrayList<String> parts = new ArrayList<>();
		int commaIndex = idString.indexOf(',');
		while (commaIndex > 0) {
			int length = Integer.valueOf(idString.substring(0, commaIndex))
					.intValue();
			String part = idString.substring(commaIndex + 1,
					commaIndex + 1 + length);
			parts.add(part);
			idString = idString.substring(commaIndex + 1 + length);
			commaIndex = idString.indexOf(',');
		}
		String[] result = parts.toArray(new String[parts.size()]);
		return new CompositeId(result);
	}

	@Override
	public String toString() {
		StringBuffer buf = new StringBuffer();
		for (int i = 0; i < fParts.length; i++) {
			buf.append(fParts[i].length());
			buf.append(',');
			buf.append(fParts[i]);
		}
		return buf.toString();
	}

	public String get(int index) {
		return fParts[index];
	}

	public int getPartCount() {
		return fParts.length;
	}
}