package no.uio.ifi.refaktor.change;

import no.uio.ifi.refaktor.change.exceptions.ExecutorManagerInitializationException;
import no.uio.ifi.refaktor.change.exceptions.SingleExecutionViolationException;
import no.uio.ifi.refaktor.change.executors.Executor;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;

public class SingleExecutionExecutorManager implements ExecutorManager {
	private Executor executor;
	private boolean isExecuted;

	public SingleExecutionExecutorManager() {
		this(null);
	}
	
	public SingleExecutionExecutorManager(Executor executor) {
		setExecutor(executor);
	}

	@Override
	public void setExecutor(Executor executor) {
		this.executor = executor;
		isExecuted = false;
	}

	@Override
	public void executeChange(IProgressMonitor monitor) throws CoreException {
		if (executor == null)
			throw new ExecutorManagerInitializationException(this.getClass().getSimpleName() + ": No executor set!");

		if (isExecuted)
			throw new SingleExecutionViolationException("The change can only be executed once!");

		executor.execute(monitor);
		markAsExecuted();
	}

	private void markAsExecuted() {
		isExecuted = true;
	}
}