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 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

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package com.sun.xml.internal.fastinfoset.algorithm;

import java.io.EOFException;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.nio.CharBuffer;

import java.util.ArrayList;

import java.util.List;

import com.sun.xml.internal.org.jvnet.fastinfoset.EncodingAlgorithmException;

import com.sun.xml.internal.fastinfoset.CommonResourceBundle;

/**

 * An encoder for handling Short values.  Suppports the builtin SHORT encoder.

 *

 * @author Alan Hudson

 * @author Paul Sandoz

 */

public class ShortEncodingAlgorithm extends IntegerEncodingAlgorithm {

    public final int getPrimtiveLengthFromOctetLength(int octetLength) throws EncodingAlgorithmException {

        if (octetLength % SHORT_SIZE != 0) {

            throw new EncodingAlgorithmException(CommonResourceBundle.getInstance().

                    getString("message.lengthNotMultipleOfShort", new Object[]{Integer.valueOf(SHORT_SIZE)}));

        }

        return octetLength / SHORT_SIZE;

    }

    public int getOctetLengthFromPrimitiveLength(int primitiveLength) {

        return primitiveLength * SHORT_SIZE;

    }

    public final Object decodeFromBytes(byte[] b, int start, int length) throws EncodingAlgorithmException {

        short[] data = new short[getPrimtiveLengthFromOctetLength(length)];

        decodeFromBytesToShortArray(data, 0, b, start, length);

        return data;

    }

    public final Object decodeFromInputStream(InputStream s) throws IOException {

        return decodeFromInputStreamToShortArray(s);

    }

    public void encodeToOutputStream(Object data, OutputStream s) throws IOException {

        if (!(data instanceof short[])) {

            throw new IllegalArgumentException(CommonResourceBundle.getInstance().getString("message.dataNotShortArray"));

        }

        final short[] idata = (short[])data;

        encodeToOutputStreamFromShortArray(idata, s);

    }

    public final Object convertFromCharacters(char[] ch, int start, int length) {

        final CharBuffer cb = CharBuffer.wrap(ch, start, length);

        final List shortList = new ArrayList();

        matchWhiteSpaceDelimnatedWords(cb,

                new WordListener() {

            public void word(int start, int end) {

                String iStringValue = cb.subSequence(start, end).toString();

                shortList.add(Short.valueOf(iStringValue));

            }

        }

        );

        return generateArrayFromList(shortList);

    }

    public final void convertToCharacters(Object data, StringBuffer s) {

        if (!(data instanceof short[])) {

            throw new IllegalArgumentException(CommonResourceBundle.getInstance().getString("message.dataNotShortArray"));

        }

        final short[] idata = (short[])data;

        convertToCharactersFromShortArray(idata, s);

    }

    public final void decodeFromBytesToShortArray(short[] sdata, int istart, byte[] b, int start, int length) {

        final int size = length / SHORT_SIZE;

        for (int i = 0; i < size; i++) {

            sdata[istart++] = (short) (((b[start++] & 0xFF) << 8) |

                    (b[start++] & 0xFF));

        }

    }

    public final short[] decodeFromInputStreamToShortArray(InputStream s) throws IOException {

        final List shortList = new ArrayList();

        final byte[] b = new byte[SHORT_SIZE];

        while (true) {

            int n = s.read(b);

            if (n != 2) {

                if (n == -1) {

                    break;

                }

                while(n != 2) {

                    final int m = s.read(b, n, SHORT_SIZE - n);

                    if (m == -1) {

                        throw new EOFException();

                    }

                    n += m;

                }

            }

            final int i = ((b[0] & 0xFF) << 8) |

                    (b[1] & 0xFF);

            shortList.add(Short.valueOf((short)i));

        }

        return generateArrayFromList(shortList);

    }

    public final void encodeToOutputStreamFromShortArray(short[] idata, OutputStream s) throws IOException {

        for (int i = 0; i < idata.length; i++) {

            final int bits = idata[i];

            s.write((bits >>> 8) & 0xFF);

            s.write(bits & 0xFF);

        }

    }

    public final void encodeToBytes(Object array, int astart, int alength, byte[] b, int start) {

        encodeToBytesFromShortArray((short[])array, astart, alength, b, start);

    }

    public final void encodeToBytesFromShortArray(short[] sdata, int istart, int ilength, byte[] b, int start) {

        final int iend = istart + ilength;

        for (int i = istart; i < iend; i++) {

            final short bits = sdata[i];

            b[start++] = (byte)((bits >>> 8) & 0xFF);

            b[start++] = (byte)(bits & 0xFF);

        }

    }

    public final void convertToCharactersFromShortArray(short[] sdata, StringBuffer s) {

        final int end = sdata.length - 1;

        for (int i = 0; i <= end; i++) {

            s.append(Short.toString(sdata[i]));

            if (i != end) {

                s.append(' ');

            }

        }

    }

    public final short[] generateArrayFromList(List array) {

        short[] sdata = new short[array.size()];

        for (int i = 0; i < sdata.length; i++) {

            sdata[i] = ((Short)array.get(i)).shortValue();

        }

        return sdata;

    }

}