plugins/org.eclipse.epp.installer.core/src/org/eclipse/epp/installer/internal/core/eclipse/EclipseUtils.java

package org.eclipse.epp.installer.internal.core.eclipse;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.LineNumberReader;
import java.util.HashMap;
import java.util.Map;

import org.eclipse.epp.installer.core.eclipse.EclipseVersion;


public class EclipseUtils {

	/**
	 * A mapping from build identifer to the text describing the 3.0 version
	 * (e.g. "200312182000" ==> "M6")
	 * @see #getMilestone(String)
	 */
	private static Map buildIdMap;

	private EclipseUtils() {
		super();
	}

	/**
	 * Determine the milestone from the build identifier
	 * @param buildId the build identifier
	 * @return the milestone or the build identifier if the milestone cannot be determined
	 */
	public static String getMilestone(String buildId) {
		if (buildId == null)
			return null;
		if (buildIdMap == null) {
			buildIdMap = new HashMap();
			
			// Eclipse 3.0 Milestones
			buildIdMap.put("200312182000", "M6");
			buildIdMap.put("200402122000", "M7");
			buildIdMap.put("200403261517", "M8");
			buildIdMap.put("200405211200", "M9");
			buildIdMap.put("200405290105", "RC1");
			buildIdMap.put("200406111814", "RC2");
			buildIdMap.put("200406192000", "RC3");
			
			// Eclipse 3.0 GA
			buildIdMap.put("200406251208", "");
			
			// Eclipse 3.0.1 GA
			buildIdMap.put("200409161125", "");
			
			// Eclipse 3.0.2 GA
			buildIdMap.put("200503110845", "");
			
			// Eclipse 3.1 Milestones
			buildIdMap.put("200408122000", "M1"); // M1
			buildIdMap.put("200409240800", "M2"); // M2
			buildIdMap.put("200411050810", "M3"); // M3
			buildIdMap.put("200412162000", "M4"); // M4
			buildIdMap.put("I20050218-1600", "M5"); // M5
			buildIdMap.put("200502181600", "M5"); // M5
			buildIdMap.put("I20050219-1500", "M5"); // M5a
			buildIdMap.put("200502191500", "M5"); // M5a
			buildIdMap.put("I20050401-1645", "M6"); // M6
			buildIdMap.put("200504011645", "M6"); // M6
			buildIdMap.put("I20050513-1415", ""); // M7
			buildIdMap.put("200505131415", ""); // M7
			buildIdMap.put("I20050527-1300", ""); // RC1
			buildIdMap.put("200505271300", ""); // RC1
			buildIdMap.put("I20050610-1757", ""); // RC2
			buildIdMap.put("200506101757", ""); // RC2
			buildIdMap.put("I20050617-1618", ""); // RC3
			buildIdMap.put("200506171618", ""); // RC3
			buildIdMap.put("I20050624-1300", ""); // RC4
			buildIdMap.put("200506241300", ""); // RC4
			
			// Eclipse 3.1 GA
			buildIdMap.put("I20050627-1435", ""); // 3.1
			buildIdMap.put("200506271435", ""); // 3.1
	
			// Eclipse 3.1.1 GA
			buildIdMap.put("M20050929-0840", ""); // 3.1.1
			buildIdMap.put("200509290840", ""); // 3.1.1
	
			// Eclipse 3.2 Milestones
			buildIdMap.put("I20050811-1530", ""); // M1
			buildIdMap.put("200508111530", ""); // M1
			buildIdMap.put("I20050923-1000", ""); // M2
			buildIdMap.put("200509231000", ""); // M2
			buildIdMap.put("I20051102-1600", ""); // M3
			buildIdMap.put("200511021600", ""); // M3
			buildIdMap.put("I20051215-1506", ""); // M4
			buildIdMap.put("200512151506", ""); // M4
		}
		String milestone = (String) buildIdMap.get(buildId);
		if (milestone == null)
			return buildId;
		if (milestone.length() == 0)
			return null;
		return milestone;
	}

	/**
	 * Read the build identifier from the specified stream.
	 * @param stream the stream containing the build identifier
	 * @return the build identifier or "???" if it cannot be determined (not <code>null</code>)
	 */
	public static String readBuildId(InputStream stream) throws IOException {
		LineNumberReader reader = new LineNumberReader(new InputStreamReader(stream));
		while (true) {
			String line = reader.readLine();
			if (line == null)
				return EclipseVersion.UNKNOWN_VERSION_TEXT;
			if (line.startsWith("0="))
				return line.substring(2).trim();
		}
	}

}