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/**
 * Copyright 2009 Ashley Williams
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you
 * may not use this file except in compliance with the License. You may
 * obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */
package protoj.lang.command;

import java.util.List;

import joptsimple.OptionSet;
import joptsimple.OptionSpec;
import protoj.lang.Command;
import protoj.lang.CommandStore;
import protoj.lang.StandardProject;

/**
 * Compiles the project code using the javac compiler. Typically this command is
 * invoked from inside a shell script as an alternative to invoking the javac
 * compiler in an os-specific way. For example the logic that detects whether or
 * not the source directory exists would be hard to replicate across batch files
 * and bash scripts.
 * 
 * In order to configure the underlying ant task, beans introspection is used on
 * the protoj.util.JavacCompileTask parent. First an example of a javac command
 * that configures the ant source property and includes filter using the protoj
 * -opt option that accepts name=value pairs:
 * 
 * 
 * "javac -opt compileTask.source=1.5 -opt dirSet.includes=org/foo/core"
 * 
 * 
 * That parent contains two properties called compileTask and dirSet that are
 * instances of org.apache.tools.ant.taskdefs.Javac and
 * org.apache.tools.ant.types.DirSet respectively and so consult the ant
 * reference to determine the available set of properties that are available for
 * configuration.
 * 
 * @author Ashley Williams
 * 
 */
public final class JavacCommand {
	private final class Body implements Runnable {
		public void run() {
			OptionSet options = delegate.getOptions();
			if (options.has(optOption)) {
				List compilerOptions = options.valuesOf(optOption);
				parent.getCompileFeature().compileJavac(compilerOptions);
			}
		}
	}

	/**
	 * Provides the basic command functionality.
	 */
	private Command delegate;

	/**
	 * The parent of this command.
	 */
	private final StandardProject parent;

	private OptionSpec optOption;

	public JavacCommand(StandardProject parent) {
		this.parent = parent;
		CommandStore store = parent.getCommandStore();
		delegate = store.addCommand("javac", "16m", new Body());
		delegate.initHelpResource("/protoj-common/language/english/javac.txt");
		delegate.initBootstrapCurrentVm();
		optOption = delegate.getParser().accepts(getOptOption())
				.withRequiredArg();
	}

	public String getOptOption() {
		return "opt";
	}

	public Command getDelegate() {
		return delegate;
	}

}