/********************************************************************
 * Copyright (c) 2007 Contributors. 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://eclipse.org/legal/epl-v10.html 
 *  
 * Contributors: IBM Corporation - initial API and implementation 
 * 				 Helen Hawkins   - initial version (bug 148190)
 *******************************************************************/
package org.aspectj.ajde.core;

import org.aspectj.ajde.core.internal.AjdeCoreBuildManager;
import org.aspectj.ajdt.internal.core.builder.IncrementalStateManager;
import org.aspectj.bridge.IMessage;
import org.aspectj.bridge.Message;
import org.aspectj.org.eclipse.jdt.internal.compiler.impl.CompilerOptions;

/**
 * The class to be used by tools to drive a build. An AjCompiler is created
 * with a unique id (for example the absolute pathname of a project
 * or .lst file) along with implementations of ICompilerConfiguration, 
 * IBuildProgressMonitor and IBuildMessageHandler. Tools then call 
 * build() or buildFresh() on this AjCompiler. 
 * 
 * <p>An AjCompiler is associated with one id, therefore a new one 
 * needs to be created for a new id (project, .lst file etc.). It is the 
 * responsibility of the tools to manage the lifecycle of the AjCompiler's. 
 */
public class AjCompiler {

	private ICompilerConfiguration compilerConfig;
	private IBuildProgressMonitor monitor;
	private IBuildMessageHandler handler;
	private String compilerId;
	
	private AjdeCoreBuildManager buildManager;

	/**
	 * Creates a new AjCompiler for the given id, ICompilerConfiguration,
	 * IBuildProgressMonitor and IBuildMessageHandler. None of the arguments 
	 * can be null.
	 * 
	 * @param compilerId - Unique String used to identify this AjCompiler
	 * @param compilerConfig - ICompilerConfiguration implementation
	 * @param buildProgressMonitor - IBuildProgressMonitor implementation
	 * @param buildMessageHandler - IBuildMessageHandler implementation
	 */
	public AjCompiler(
			String compilerId,
			ICompilerConfiguration compilerConfig,
			IBuildProgressMonitor buildProgressMonitor,
			IBuildMessageHandler buildMessageHandler) {
		this.compilerConfig = compilerConfig;
		this.monitor = buildProgressMonitor;
		this.handler = buildMessageHandler;
		this.compilerId = compilerId;

		buildManager = new AjdeCoreBuildManager(this);
	}
	
	/**
	 * @return the id for this AjCompiler
	 */
	public String getId() {
		return compilerId;
	}
	
	/**
	 * @return the ICompilerConfiguration associated with this AjCompiler
	 */
	public ICompilerConfiguration getCompilerConfiguration() {
		return compilerConfig;
	}
	
	/**
	 * @return the IBuildProgressMonitor associated with this AjCompiler
	 */
	public IBuildProgressMonitor getBuildProgressMonitor() {
		return monitor;
	}

	/**
	 * @return the IBuildMessageHandler associated with this AjCompiler
	 */
	public IBuildMessageHandler getMessageHandler() {
		return handler;
	}
	
	/**
	 * Perform an incremental build if possible, otherwise it will
	 * default to a full build.
	 */
	public void build() {
		if (hasValidId()) {
			buildManager.doBuild(false);
		}
	}
	
	/**
	 * Perform a full build
	 */
	public void buildFresh() {
		if (hasValidId()) {
			buildManager.doBuild(true);			
		}
	}
	
	/**
	 * Clear the incremental state associated with this AjCompiler
	 * from the IncrementalStateManager. This is necessary until AjState
	 * is reworked and there's an AjState associated with an AjCompiler
	 * rather than requiring a map of them.
	 */
	public void clearLastState() {
		IncrementalStateManager.removeIncrementalStateInformationFor(compilerId);
	}
	
	/**
	 * @return true if the underlying version of the compiler
	 * is compatible with Java 6, returns false otherwise.
	 */
	public boolean isJava6Compatible() {
		return CompilerOptions.versionToJdkLevel(JavaOptions.VERSION_16) != 0;
	}
	
	/**
	 * Ensures that the id associated with this compiler is non-null. If
	 * it is null then sends an ABORT message to the messageHandler
	 */
	private boolean hasValidId() {
		if (compilerId == null) {
			Message msg = new Message("compiler didn't have an id associated " +
					"with it",IMessage.ABORT,null,null);
	    	handler.handleMessage(msg);
	    	return false;
		}	
		return true;
	}
	
}