/*
 * Copyright (C) The Apache Software Foundation. All rights reserved.
 *
 * This software is published under the terms of the Apache Software License
 * version 1.1, a copy of which has been included with this distribution in
 * the LICENSE.txt file.
 */

package forrestbot;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;

/**
 * General IO Stream manipulation.
 * <p>
 * This class provides static utility methods for input/output operations, particularly buffered
 * copying between sources (<code>InputStream</code>, <code>Reader</code>, <code>String</code> and
 * <code>byte[]</code>) and destinations (<code>OutputStream</code>, <code>Writer</code>,
 * <code>String</code> and <code>byte[]</code>).
 * </p>
 *
 * <p>Unless otherwise noted, these <code>copy</code> methods do <em>not</em> flush or close the
 * streams. Often, doing so would require making non-portable assumptions about the streams' origin
 * and further use. This means that both streams' <code>close()</code> methods must be called after
 * copying. if one omits this step, then the stream resources (sockets, file descriptors) are
 * released when the associated Stream is garbage-collected. It is not a good idea to rely on this
 * mechanism. For a good overview of the distinction between "memory management" and "resource
 * management", see <a href="http://www.unixreview.com/articles/1998/9804/9804ja/ja.htm">this
 * UnixReview article</a></p>
 *
 * <p>For each <code>copy</code> method, a variant is provided that allows the caller to specify the
 * buffer size (the default is 4k). As the buffer size can have a fairly large impact on speed, this
 * may be worth tweaking. Often "large buffer -&gt; faster" does not hold, even for large data
 * transfers.</p>
 *
 * <p>For byte-to-char methods, a <code>copy</code> variant allows the encoding to be selected
 * (otherwise the platform default is used).</p>
 *
 * <p>The <code>copy</code> methods use an internal buffer when copying. It is therefore advisable
 * <em>not</em> to deliberately wrap the stream arguments to the <code>copy</code> methods in
 * <code>Buffered*</code> streams. For example, don't do the
 * following:</p>
 *
 * <code>copy( new BufferedInputStream( in ), new BufferedOutputStream( out ) );</code>
 *
 * <p>The rationale is as follows:</p>
 *
 * <p>Imagine that an InputStream's read() is a very expensive operation, which would usually suggest
 * wrapping in a BufferedInputStream. The BufferedInputStream works by issuing infrequent
 * {@link java.io.InputStream#read(byte[] b, int off, int len)} requests on the underlying InputStream, to
 * fill an internal buffer, from which further <code>read</code> requests can inexpensively get
 * their data (until the buffer runs out).</p>
 * <p>However, the <code>copy</code> methods do the same thing, keeping an internal buffer,
 * populated by {@link InputStream#read(byte[] b, int off, int len)} requests. Having two buffers
 * (or three if the destination stream is also buffered) is pointless, and the unnecessary buffer
 * management hurts performance slightly (about 3%, according to some simple experiments).</p>
 *
 * @author <a href="mailto:peter at apache.org">Peter Donald</a>
 * @author <a href="mailto:jefft@apache.org">Jeff Turner</a>
 * @version CVS $Revision: 1.1 $ $Date: 2002/12/07 09:33:59 $
 * @since 4.0
 */

/*
 * Behold, intrepid explorers; a map of this class:
 *
 *       Method      Input               Output          Dependency
 *       ------      -----               ------          -------
 * 1     copy        InputStream         OutputStream    (primitive)
 * 2     copy        Reader              Writer          (primitive)
 *
 * 3     copy        InputStream         Writer          2
 * 4     toString    InputStream         String          3
 * 5     toByteArray InputStream         byte[]          1
 *
 * 6     copy        Reader              OutputStream    2
 * 7     toString    Reader              String          2
 * 8     toByteArray Reader              byte[]          6
 *
 * 9     copy        String              OutputStream    2
 * 10    copy        String              Writer          (trivial)
 * 11    toByteArray String              byte[]          9
 *
 * 12    copy        byte[]              Writer          3
 * 13    toString    byte[]              String          12
 * 14    copy        byte[]              OutputStream    (trivial)
 *
 *
 * Note that only the first two methods shuffle bytes; the rest use these two, or (if possible) copy
 * using native Java copy methods. As there are method variants to specify buffer size and encoding,
 * each row may correspond to up to 4 methods.
 *
 */

public final class IOUtil
{
    private static final int DEFAULT_BUFFER_SIZE = 1024 * 4;

    /**
     * Private constructor to prevent instantiation.
     */
    private IOUtil()
    {
    }

    /**
     * Unconditionally close an <code>Reader</code>.
     * Equivalent to {@link Reader#close()}, except any exceptions will be ignored.
     *
     * @param input A (possibly null) Reader
     */
    public static void shutdownReader( final Reader input )
    {
        if( null == input )
        {
            return;
        }

        try
        {
            input.close();
        }
        catch( final IOException ioe )
        {
        }
    }

    /**
     * Unconditionally close an <code>Writer</code>.
     * Equivalent to {@link Writer#close()}, except any exceptions will be ignored.
     *
     * @param output A (possibly null) Writer
     */
    public static void shutdownWriter( final Writer output )
    {
        if( null == output )
        {
            return;
        }

        try
        {
            output.close();
        }
        catch( final IOException ioe )
        {
        }
    }

    /**
     * Unconditionally close an <code>OutputStream</code>.
     * Equivalent to {@link OutputStream#close()}, except any exceptions will be ignored.
     * @param output A (possibly null) OutputStream
     */
    public static void shutdownStream( final OutputStream output )
    {
        if( null == output )
        {
            return;
        }

        try
        {
            output.close();
        }
        catch( final IOException ioe )
        {
        }
    }

    /**
     * Unconditionally close an <code>InputStream</code>.
     * Equivalent to {@link InputStream#close()}, except any exceptions will be ignored.
     * @param input A (possibly null) InputStream
     */
    public static void shutdownStream( final InputStream input )
    {
        if( null == input )
        {
            return;
        }

        try
        {
            input.close();
        }
        catch( final IOException ioe )
        {
        }
    }

    ///////////////////////////////////////////////////////////////
    // Core copy methods
    ///////////////////////////////////////////////////////////////

    /**
     * Copy bytes from an <code>InputStream</code> to an <code>OutputStream</code>.
     */
    public static void copy( final InputStream input, final OutputStream output )
        throws IOException
    {
        copy( input, output, DEFAULT_BUFFER_SIZE );
    }

    /**
     * Copy bytes from an <code>InputStream</code> to an <code>OutputStream</code>.
     * @param bufferSize Size of internal buffer to use.
     */
    public static void copy( final InputStream input,
                             final OutputStream output,
                             final int bufferSize )
        throws IOException
    {
        final byte[] buffer = new byte[ bufferSize ];
        int n = 0;
        while( -1 != ( n = input.read( buffer ) ) )
        {
            output.write( buffer, 0, n );
        }
    }

    /**
     * Copy chars from a <code>Reader</code> to a <code>Writer</code>.
     */
    public static void copy( final Reader input, final Writer output )
        throws IOException
    {
        copy( input, output, DEFAULT_BUFFER_SIZE );
    }

    /**
     * Copy chars from a <code>Reader</code> to a <code>Writer</code>.
     * @param bufferSize Size of internal buffer to use.
     */
    public static void copy( final Reader input, final Writer output, final int bufferSize )
        throws IOException
    {
        final char[] buffer = new char[ bufferSize ];
        int n = 0;
        while( -1 != ( n = input.read( buffer ) ) )
        {
            output.write( buffer, 0, n );
        }
    }

    ///////////////////////////////////////////////////////////////
    // Derived copy methods
    // InputStream -> *
    ///////////////////////////////////////////////////////////////


    ///////////////////////////////////////////////////////////////
    // InputStream -> Writer

    /**
     * Copy and convert bytes from an <code>InputStream</code> to chars on a
     * <code>Writer</code>.
     * The platform's default encoding is used for the byte-to-char conversion.
     */
    public static void copy( final InputStream input, final Writer output )
        throws IOException
    {
        copy( input, output, DEFAULT_BUFFER_SIZE );
    }

    /**
     * Copy and convert bytes from an <code>InputStream</code> to chars on a
     * <code>Writer</code>.
     * The platform's default encoding is used for the byte-to-char conversion.
     * @param bufferSize Size of internal buffer to use.
     */
    public static void copy( final InputStream input, final Writer output, final int bufferSize )
        throws IOException
    {
        final InputStreamReader in = new InputStreamReader( input );
        copy( in, output, bufferSize );
    }

    /**
     * Copy and convert bytes from an <code>InputStream</code> to chars on a
     * <code>Writer</code>, using the specified encoding.
     * @param encoding The name of a supported character encoding. See the
     * <a href="http://www.iana.org/assignments/character-sets">IANA
     * Charset Registry</a> for a list of valid encoding types.
     */
    public static void copy( final InputStream input, final Writer output, final String encoding )
        throws IOException
    {
        final InputStreamReader in = new InputStreamReader( input, encoding );
        copy( in, output );
    }

    /**
     * Copy and convert bytes from an <code>InputStream</code> to chars on a
     * <code>Writer</code>, using the specified encoding.
     * @param encoding The name of a supported character encoding. See the
     *        <a href="http://www.iana.org/assignments/character-sets">IANA
     *        Charset Registry</a> for a list of valid encoding types.
     * @param bufferSize Size of internal buffer to use.
     */
    public static void copy( final InputStream input,
                             final Writer output,
                             final String encoding,
                             final int bufferSize )
        throws IOException
    {
        final InputStreamReader in = new InputStreamReader( input, encoding );
        copy( in, output, bufferSize );
    }


    ///////////////////////////////////////////////////////////////
    // InputStream -> String

    /**
     * Get the contents of an <code>InputStream</code> as a String.
     * The platform's default encoding is used for the byte-to-char conversion.
     */
    public static String toString( final InputStream input )
        throws IOException
    {
        return toString( input, DEFAULT_BUFFER_SIZE );
    }

    /**
     * Get the contents of an <code>InputStream</code> as a String.
     * The platform's default encoding is used for the byte-to-char conversion.
     * @param bufferSize Size of internal buffer to use.
     */
    public static String toString( final InputStream input, final int bufferSize )
        throws IOException
    {
        final StringWriter sw = new StringWriter();
        copy( input, sw, bufferSize );
        return sw.toString();
    }

    /**
     * Get the contents of an <code>InputStream</code> as a String.
     * @param encoding The name of a supported character encoding. See the
     *    <a href="http://www.iana.org/assignments/character-sets">IANA
     *    Charset Registry</a> for a list of valid encoding types.
     */
    public static String toString( final InputStream input, final String encoding )
        throws IOException
    {
        return toString( input, encoding, DEFAULT_BUFFER_SIZE );
    }

    /**
     * Get the contents of an <code>InputStream</code> as a String.
     * @param encoding The name of a supported character encoding. See the
     *   <a href="http://www.iana.org/assignments/character-sets">IANA
     *   Charset Registry</a> for a list of valid encoding types.
     * @param bufferSize Size of internal buffer to use.
     */
    public static String toString( final InputStream input,
                                   final String encoding,
                                   final int bufferSize )
        throws IOException
    {
        final StringWriter sw = new StringWriter();
        copy( input, sw, encoding, bufferSize );
        return sw.toString();
    }

    ///////////////////////////////////////////////////////////////
    // InputStream -> byte[]

    /**
     * Get the contents of an <code>InputStream</code> as a <code>byte[]</code>.
     */
    public static byte[] toByteArray( final InputStream input )
        throws IOException
    {
        return toByteArray( input, DEFAULT_BUFFER_SIZE );
    }

    /**
     * Get the contents of an <code>InputStream</code> as a <code>byte[]</code>.
     * @param bufferSize Size of internal buffer to use.
     */
    public static byte[] toByteArray( final InputStream input, final int bufferSize )
        throws IOException
    {
        final ByteArrayOutputStream output = new ByteArrayOutputStream();
        copy( input, output, bufferSize );
        return output.toByteArray();
    }


    ///////////////////////////////////////////////////////////////
    // Derived copy methods
    // Reader -> *
    ///////////////////////////////////////////////////////////////

    ///////////////////////////////////////////////////////////////
    // Reader -> OutputStream
    /**
     * Serialize chars from a <code>Reader</code> to bytes on an <code>OutputStream</code>, and
     * flush the <code>OutputStream</code>.
     */
    public static void copy( final Reader input, final OutputStream output )
        throws IOException
    {
        copy( input, output, DEFAULT_BUFFER_SIZE );
    }

    /**
     * Serialize chars from a <code>Reader</code> to bytes on an <code>OutputStream</code>, and
     * flush the <code>OutputStream</code>.
     * @param bufferSize Size of internal buffer to use.
     */
    public static void copy( final Reader input, final OutputStream output, final int bufferSize )
        throws IOException
    {
        final OutputStreamWriter out = new OutputStreamWriter( output );
        copy( input, out, bufferSize );
        // NOTE: Unless anyone is planning on rewriting OutputStreamWriter, we have to flush
        // here.
        out.flush();
    }

    ///////////////////////////////////////////////////////////////
    // Reader -> String
    /**
     * Get the contents of a <code>Reader</code> as a String.
     */
    public static String toString( final Reader input )
        throws IOException
    {
        return toString( input, DEFAULT_BUFFER_SIZE );
    }

    /**
     * Get the contents of a <code>Reader</code> as a String.
     * @param bufferSize Size of internal buffer to use.
     */
    public static String toString( final Reader input, final int bufferSize )
        throws IOException
    {
        final StringWriter sw = new StringWriter();
        copy( input, sw, bufferSize );
        return sw.toString();
    }


    ///////////////////////////////////////////////////////////////
    // Reader -> byte[]
    /**
     * Get the contents of a <code>Reader</code> as a <code>byte[]</code>.
     */
    public static byte[] toByteArray( final Reader input )
        throws IOException
    {
        return toByteArray( input, DEFAULT_BUFFER_SIZE );
    }

    /**
     * Get the contents of a <code>Reader</code> as a <code>byte[]</code>.
     * @param bufferSize Size of internal buffer to use.
     */
    public static byte[] toByteArray( final Reader input, final int bufferSize )
        throws IOException
    {
        ByteArrayOutputStream output = new ByteArrayOutputStream();
        copy( input, output, bufferSize );
        return output.toByteArray();
    }


    ///////////////////////////////////////////////////////////////
    // Derived copy methods
    // String -> *
    ///////////////////////////////////////////////////////////////


    ///////////////////////////////////////////////////////////////
    // String -> OutputStream

    /**
     * Serialize chars from a <code>String</code> to bytes on an <code>OutputStream</code>, and
     * flush the <code>OutputStream</code>.
     */
    public static void copy( final String input, final OutputStream output )
        throws IOException
    {
        copy( input, output, DEFAULT_BUFFER_SIZE );
    }

    /**
     * Serialize chars from a <code>String</code> to bytes on an <code>OutputStream</code>, and
     * flush the <code>OutputStream</code>.
     * @param bufferSize Size of internal buffer to use.
     */
    public static void copy( final String input, final OutputStream output, final int bufferSize )
        throws IOException
    {
        final StringReader in = new StringReader( input );
        final OutputStreamWriter out = new OutputStreamWriter( output );
        copy( in, out, bufferSize );
        // NOTE: Unless anyone is planning on rewriting OutputStreamWriter, we have to flush
        // here.
        out.flush();
    }



    ///////////////////////////////////////////////////////////////
    // String -> Writer

    /**
     * Copy chars from a <code>String</code> to a <code>Writer</code>.
     */
    public static void copy( final String input, final Writer output )
        throws IOException
    {
        output.write( input );
    }

    /**
     * Copy bytes from an <code>InputStream</code> to an
     * <code>OutputStream</code>, with buffering.
     * This is equivalent to passing a
     * {@link java.io.BufferedInputStream} and
     * {@link java.io.BufferedOutputStream} to {@link #copy(InputStream, OutputStream)},
     * and flushing the output stream afterwards. The streams are not closed
     * after the copy.
     * @deprecated Buffering streams is actively harmful! See the class description as to why. Use
     * {@link #copy(InputStream, OutputStream)} instead.
     */
    public static void bufferedCopy( final InputStream input, final OutputStream output )
        throws IOException
    {
        final BufferedInputStream in = new BufferedInputStream( input );
        final BufferedOutputStream out = new BufferedOutputStream( output );
        copy( in, out );
        out.flush();
    }


    ///////////////////////////////////////////////////////////////
    // String -> byte[]
    /**
     * Get the contents of a <code>String</code> as a <code>byte[]</code>.
     */
    public static byte[] toByteArray( final String input )
        throws IOException
    {
        return toByteArray( input, DEFAULT_BUFFER_SIZE );
    }

    /**
     * Get the contents of a <code>String</code> as a <code>byte[]</code>.
     * @param bufferSize Size of internal buffer to use.
     */
    public static byte[] toByteArray( final String input, final int bufferSize )
        throws IOException
    {
        ByteArrayOutputStream output = new ByteArrayOutputStream();
        copy( input, output, bufferSize );
        return output.toByteArray();
    }



    ///////////////////////////////////////////////////////////////
    // Derived copy methods
    // byte[] -> *
    ///////////////////////////////////////////////////////////////


    ///////////////////////////////////////////////////////////////
    // byte[] -> Writer

    /**
     * Copy and convert bytes from a <code>byte[]</code> to chars on a
     * <code>Writer</code>.
     * The platform's default encoding is used for the byte-to-char conversion.
     */
    public static void copy( final byte[] input, final Writer output )
        throws IOException
    {
        copy( input, output, DEFAULT_BUFFER_SIZE );
    }

    /**
     * Copy and convert bytes from a <code>byte[]</code> to chars on a
     * <code>Writer</code>.
     * The platform's default encoding is used for the byte-to-char conversion.
     * @param bufferSize Size of internal buffer to use.
     */
    public static void copy( final byte[] input, final Writer output, final int bufferSize )
        throws IOException
    {
        final ByteArrayInputStream in = new ByteArrayInputStream( input );
        copy( in, output, bufferSize );
    }

    /**
     * Copy and convert bytes from a <code>byte[]</code> to chars on a
     * <code>Writer</code>, using the specified encoding.
     * @param encoding The name of a supported character encoding. See the
     * <a href="http://www.iana.org/assignments/character-sets">IANA
     * Charset Registry</a> for a list of valid encoding types.
     */
    public static void copy( final byte[] input, final Writer output, final String encoding )
        throws IOException
    {
        final ByteArrayInputStream in = new ByteArrayInputStream( input );
        copy( in, output, encoding );
    }

    /**
     * Copy and convert bytes from a <code>byte[]</code> to chars on a
     * <code>Writer</code>, using the specified encoding.
     * @param encoding The name of a supported character encoding. See the
     *        <a href="http://www.iana.org/assignments/character-sets">IANA
     *        Charset Registry</a> for a list of valid encoding types.
     * @param bufferSize Size of internal buffer to use.
     */
    public static void copy( final byte[] input,
                             final Writer output,
                             final String encoding,
                             final int bufferSize )
        throws IOException
    {
        final ByteArrayInputStream in = new ByteArrayInputStream( input );
        copy( in, output, encoding, bufferSize );
    }


    ///////////////////////////////////////////////////////////////
    // byte[] -> String

    /**
     * Get the contents of a <code>byte[]</code> as a String.
     * The platform's default encoding is used for the byte-to-char conversion.
     */
    public static String toString( final byte[] input )
        throws IOException
    {
        return toString( input, DEFAULT_BUFFER_SIZE );
    }

    /**
     * Get the contents of a <code>byte[]</code> as a String.
     * The platform's default encoding is used for the byte-to-char conversion.
     * @param bufferSize Size of internal buffer to use.
     */
    public static String toString( final byte[] input, final int bufferSize )
        throws IOException
    {
        final StringWriter sw = new StringWriter();
        copy( input, sw, bufferSize );
        return sw.toString();
    }

    /**
     * Get the contents of a <code>byte[]</code> as a String.
     * @param encoding The name of a supported character encoding. See the
     *    <a href="http://www.iana.org/assignments/character-sets">IANA
     *    Charset Registry</a> for a list of valid encoding types.
     */
    public static String toString( final byte[] input, final String encoding )
        throws IOException
    {
        return toString( input, encoding, DEFAULT_BUFFER_SIZE );
    }

    /**
     * Get the contents of a <code>byte[]</code> as a String.
     * @param encoding The name of a supported character encoding. See the
     *   <a href="http://www.iana.org/assignments/character-sets">IANA
     *   Charset Registry</a> for a list of valid encoding types.
     * @param bufferSize Size of internal buffer to use.
     */
    public static String toString( final byte[] input,
                                   final String encoding,
                                   final int bufferSize )
        throws IOException
    {
        final StringWriter sw = new StringWriter();
        copy( input, sw, encoding, bufferSize );
        return sw.toString();
    }


    ///////////////////////////////////////////////////////////////
    // byte[] -> OutputStream

    /**
     * Copy bytes from a <code>byte[]</code> to an <code>OutputStream</code>.
     */
    public static void copy( final byte[] input, final OutputStream output )
        throws IOException
    {
        copy( input, output, DEFAULT_BUFFER_SIZE );
    }

    /**
     * Copy bytes from a <code>byte[]</code> to an <code>OutputStream</code>.
     * @param bufferSize Size of internal buffer to use.
     */
    public static void copy( final byte[] input,
                             final OutputStream output,
                             final int bufferSize )
        throws IOException
    {
        output.write( input );
    }

    /**
     * Compare the contents of two Streams to determine if they are equal or not.
     *
     * @param input1 the first stream
     * @param input2 the second stream
     * @return true if the content of the streams are equal or they both don't exist, false otherwise
     */
    public static boolean contentEquals( final InputStream input1,
                                         final InputStream input2 )
        throws IOException
    {
        final InputStream bufferedInput1 = new BufferedInputStream( input1 );
        final InputStream bufferedInput2 = new BufferedInputStream( input2 );

        int ch = bufferedInput1.read();
        while( -1 != ch )
        {
            final int ch2 = bufferedInput2.read();
            if( ch != ch2 )
            {
                return false;
            }
            ch = bufferedInput1.read();
        }

        final int ch2 = bufferedInput2.read();
        if( -1 != ch2 )
        {
            return false;
        }
        else
        {
            return true;
        }
    }
}
