plugins/org.eclipse.epp.installer.launcher/src/org/eclipse/epp/installer/launcher/InstallManifest.java

package org.eclipse.epp.installer.launcher;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

/**
 * <p>
 * Copyright (c) 2006, Instantiations, Inc.<br>
 * All Rights Reserved
 */
public class InstallManifest {
	private Map mainSection;
	private Map sections = new HashMap();
	
	public InstallManifest(){
		
	}
	
	public InstallManifest(InputStream is) throws IOException{
		load(is);
	}
	
	public void load(InputStream is) throws IOException{
		BufferedReader br = new BufferedReader(new InputStreamReader(is));
		String sectionName = null; 
		mainSection = new HashMap();
		String mainSectionName = readSection(br, mainSection);
		if(mainSectionName != null){
			// there should be no "Platform" key in main section!
			throw new IOException("Invalid main manifest section");
		}
		do{
			Map section = new HashMap();
			sectionName = readSection(br, section);
			if(sectionName == null && section.size() != 0) {
				// "Platform" key not found in section
				throw new IOException("Invalid manifest section: no key 'Platform'");
			}else if(sectionName != null){
				sections.put(sectionName, section);
			}
		}while(sectionName != null);
	}

	private String readSection(BufferedReader br, Map section) throws IOException {
		String sectionName = null;
		String line;
		while((line = br.readLine()) != null){
			if(line.equals("")){ // empty line is section delimiter
				return sectionName;
			}
			
			int delimiter = line.indexOf(":");
			if(delimiter == -1) {
				throw new IOException("Invalid manifest: Line is not key:value pair!");
			}
				
			String name = line.substring(0, delimiter).trim();
			String value = line.substring(delimiter+1).trim();
			
			if(name.equals("Platform")){
				sectionName = value;
			}else{
				if(section.get(name) != null) {
					throw new IOException("Invalid manifest: duplicated keys in section!");
				}
				section.put(name, value);
			}
		}
		return sectionName;
	}
	
	public Map getMainAttributes(){
		return mainSection;
	}
	public Collection getEntries(){
		return sections.entrySet();
	}
	public Map getAttributes(String name){
		return (Map) sections.get(name);
	}
}