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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;

public class IntEncodingAlgorithm extends IntegerEncodingAlgorithm {

    public final int getPrimtiveLengthFromOctetLength(int octetLength) throws EncodingAlgorithmException {

        if (octetLength % INT_SIZE != 0) {

            throw new EncodingAlgorithmException(CommonResourceBundle.getInstance().

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

        }

        return octetLength / INT_SIZE;

    }

    public int getOctetLengthFromPrimitiveLength(int primitiveLength) {

        return primitiveLength * INT_SIZE;

    }

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

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

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

        return data;

    }

    public final Object decodeFromInputStream(InputStream s) throws IOException {

        return decodeFromInputStreamToIntArray(s);

    }

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

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

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

        }

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

        encodeToOutputStreamFromIntArray(idata, s);

    }

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

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

        final List integerList = new ArrayList();

        matchWhiteSpaceDelimnatedWords(cb,

                new WordListener() {

            public void word(int start, int end) {

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

                integerList.add(Integer.valueOf(iStringValue));

            }

        }

        );

        return generateArrayFromList(integerList);

    }

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

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

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

        }

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

        convertToCharactersFromIntArray(idata, s);

    }

    public final void decodeFromBytesToIntArray(int[] idata, int istart, byte[] b, int start, int length) {

        final int size = length / INT_SIZE;

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

            idata[istart++] = ((b[start++] & 0xFF) << 24) |

                    ((b[start++] & 0xFF) << 16) |

                    ((b[start++] & 0xFF) << 8) |

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

        }

    }

    public final int[] decodeFromInputStreamToIntArray(InputStream s) throws IOException {

        final List integerList = new ArrayList();

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

        while (true) {

            int n = s.read(b);

            if (n != 4) {

                if (n == -1) {

                    break;

                }

                while(n != 4) {

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

                    if (m == -1) {

                        throw new EOFException();

                    }

                    n += m;

                }

            }

            final int i = ((b[0] & 0xFF) << 24) |

                    ((b[1] & 0xFF) << 16) |

                    ((b[2] & 0xFF) << 8) |

                    (b[3] & 0xFF);

            integerList.add(Integer.valueOf(i));

        }

        return generateArrayFromList(integerList);

    }

    public final void encodeToOutputStreamFromIntArray(int[] idata, OutputStream s) throws IOException {

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

            final int bits = idata[i];

            s.write((bits >>> 24) & 0xFF);

            s.write((bits >>> 16) & 0xFF);

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

            s.write(bits & 0xFF);

        }

    }

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

        encodeToBytesFromIntArray((int[])array, astart, alength, b, start);

    }

    public final void encodeToBytesFromIntArray(int[] idata, int istart, int ilength, byte[] b, int start) {

        final int iend = istart + ilength;

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

            final int bits = idata[i];

            b[start++] = (byte)((bits >>> 24) & 0xFF);

            b[start++] = (byte)((bits >>> 16) & 0xFF);

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

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

        }

    }

    public final void convertToCharactersFromIntArray(int[] idata, StringBuffer s) {

        final int end = idata.length - 1;

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

            s.append(Integer.toString(idata[i]));

            if (i != end) {

                s.append(' ');

            }

        }

    }

    public final int[] generateArrayFromList(List array) {

        int[] idata = new int[array.size()];

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

            idata[i] = ((Integer)array.get(i)).intValue();

        }

        return idata;

    }

}