eu.planets_project.pp.plato.util.FileUtils.java Source code

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Here is the source code for eu.planets_project.pp.plato.util.FileUtils.java

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/*******************************************************************************
 * Copyright (c) 2006-2010 Vienna University of Technology, 
 * Department of Software Technology and Interactive Systems
 *
 * All rights reserved. This program and the accompanying
 * materials are made available under the terms of the
 * Apache License, Version 2.0 which accompanies
 * this distribution, and is available at
 * http://www.apache.org/licenses/LICENSE-2.0 
 *******************************************************************************/
package eu.planets_project.pp.plato.util;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Serializable;
import java.net.URI;
import java.net.URISyntaxException;

import org.apache.commons.logging.Log;

public class FileUtils implements Serializable {
    private static final long serialVersionUID = -2554713564317100326L;

    static final Log log = PlatoLogger.getLogger(FileUtils.class);

    public static File getResourceFile(String name) throws URISyntaxException {
        URI uri = Thread.currentThread().getContextClassLoader().getResource(name).toURI();
        return new File(uri);
    }

    public static byte[] inputStreamToBytes(InputStream in) throws IOException {
        ByteArrayOutputStream out = new ByteArrayOutputStream(1024);
        byte[] buffer = new byte[1024];
        int len;

        while ((len = in.read(buffer)) >= 0)
            out.write(buffer, 0, len);

        in.close();
        out.close();
        return out.toByteArray();
    }

    public static byte[] getBytesFromFile(File file) throws IOException {
        InputStream is = new FileInputStream(file);
        byte[] bytes;
        try {

            // Get the size of the file
            long length = file.length();

            if (length > Integer.MAX_VALUE) {
                // File is too large
            }

            // Create the byte array to hold the data
            bytes = new byte[(int) length];

            // Read in the bytes
            int offset = 0;
            int numRead = 0;
            while (offset < bytes.length && (numRead = is.read(bytes, offset, bytes.length - offset)) >= 0) {
                offset += numRead;
            }

            // Ensure all the bytes have been read in
            if (offset < bytes.length) {
                throw new IOException("Could not completely read file " + file.getName());
            }

        } finally {
            // Close the input stream and return bytes
            is.close();
        }
        return bytes;
    }

    public static String replaceExtension(String filename, String newExtension) {
        return filename.substring(0, filename.lastIndexOf(".")) + "." + newExtension;
    }

    public static String makeFilename(String value) {
        if (value == null)
            return "";
        // \w .. [a-zA-Z_0-9]
        return value.replaceAll("\\s", "_").replaceAll("[^\\w-]", "");
    }

    public static void writeToFile(InputStream in, OutputStream out) throws IOException {
        try {
            byte[] buf = new byte[1024];
            int len;
            while ((len = in.read(buf)) > 0) {
                out.write(buf, 0, len);
            }
        } catch (FileNotFoundException ex) {
            log.debug("Error copying file " + ex.getMessage(), ex);
        } finally {
            try {
                in.close();
            } catch (Exception skip) {
            }
            try {
                out.close();
            } catch (Exception skip) {
            }

        }
    }
}