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/*******************************************************************************
 * Copyright (c) 2009, 2018 itemis AG (http://www.itemis.eu) and others.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * SPDX-License-Identifier: EPL-2.0
 *******************************************************************************/
package org.eclipse.emf.mwe.utils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.channels.FileChannel;

import org.eclipse.emf.mwe.core.WorkflowContext;
import org.eclipse.emf.mwe.core.issues.Issues;
import org.eclipse.emf.mwe.core.lib.AbstractWorkflowComponent;
import org.eclipse.emf.mwe.core.monitor.ProgressMonitor;

/**
 * Copies one file in the file system to another location. Performs low-level read/write operations using NIO.
 * 
 * @author Achim Demelt
 */
public class FileCopy extends AbstractWorkflowComponent {
	private String sourceFile = null;
	private String targetFile = null;

	public void setSourceFile(String sourceFile) {
		this.sourceFile = sourceFile;
	}

	public void setTargetFile(String targetFile) {
		this.targetFile = targetFile;
	}

	@Override
	public void checkConfiguration(Issues issues) {
		if (sourceFile == null) {
			issues.addError("No sourceFile set.");
		}
		if (targetFile == null) {
			issues.addError("No targetFile set.");
		}
	}

	@Override
	protected void invokeInternal(WorkflowContext ctx, ProgressMonitor monitor, Issues issues) {
		try {
			File source = new File(sourceFile);
			File target = new File(targetFile);

			if (!source.exists()) {
				issues.addWarning(this, "Source file " + sourceFile + " does not exist. Skipping.");
				return;
			}
			if (!target.exists()) {
				target.createNewFile();
			}

			
			try (
				FileInputStream fileInputStream = new FileInputStream(source);
				FileOutputStream fileOutputStream = new FileOutputStream(target);
				FileChannel sourceChannel = fileInputStream.getChannel();
				FileChannel destinationChannel = fileOutputStream.getChannel();
			) {
				destinationChannel.transferFrom(sourceChannel, 0, sourceChannel.size());
			}
		}
		catch (IOException x) {
			issues.addError(this, "Cannot perform I/O.", x);
		}
	}
}