/*
 * FindBugs Eclipse Plug-in.
 * Copyright (C) 2005, University of Maryland
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package de.tobject.findbugs.io;

import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;

import de.tobject.findbugs.FindbugsPlugin;

/**
 * Input/output helper methods.
 * 
 * @author David Hovemeyer
 */
public abstract class IO {
	/**
	 * Write the contents of a file in the Eclipse workspace.
	 * 
	 * @param file
	 *            the file to write to
	 * @param output
	 *            the FileOutput object responsible for generating the data
	 * @param monitor
	 *            a progress monitor (or null if none)
	 * @throws CoreException
	 */
	public static void writeFile(IFile file, final FileOutput output,
			IProgressMonitor monitor) throws CoreException {

		try {
			ByteArrayOutputStream bos = new ByteArrayOutputStream();
			output.writeFile(bos);
			ByteArrayInputStream bis = new ByteArrayInputStream(bos.toByteArray());
			if (!file.exists()) {
				file.create(bis, true, monitor);
			} else {
				file.setContents(bis, true, false, monitor);
			}
		} catch (IOException e) {
			IStatus status = FindbugsPlugin.createErrorStatus("Exception while "
					+ output.getTaskDescription(), e);
			throw new CoreException(status);
		}
	}

	/**
	 * Write the contents of a java.io.File
	 * 
	 * @param file
	 *            the file to write to
	 * @param output
	 *            the FileOutput object responsible for generating the data
	 */
	public static void writeFile(final File file, final FileOutput output,
			final IProgressMonitor monitor) throws CoreException {
		FileOutputStream fout = null;
		try {
			fout = new FileOutputStream(file);
			BufferedOutputStream bout = new BufferedOutputStream(fout);
			if (monitor != null) {
				monitor.subTask("writing data to " + file.getName());
			}
			output.writeFile(bout);
			bout.flush();
		} catch (IOException e) {
			IStatus status = FindbugsPlugin.createErrorStatus("Exception while "
					+ output.getTaskDescription(), e);
			throw new CoreException(status);
		} finally {
			closeQuietly(fout);
		}
	}

	public static void closeQuietly(Closeable closeable) {
		if (closeable != null) {
			try {
				closeable.close();
			} catch (IOException e) {
				// ignore
			}
		}
	}
}