Java Double Number From toDoubles(byte[] bytes)

Description

to Doubles

License

Apache License

Declaration

public static double[] toDoubles(byte[] bytes) 

Method Source Code

//package com.java2s;
/** I re-ported the (slightly modified) HBase's Bytes code here
 * to avoid dependencies on HBase in the common package of DML.
 * The copyright is included.//from   w  ww .  ja  v  a 2s.co  m
 *
 *
 * Copyright 2010 The Apache Software Foundation
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

public class Main {
    /** I re-ported the (slightly modified) HBase's Bytes code here
     * to avoid dependencies on HBase in the common package of DML.
     * The copyright is included.
     *
     *
     * Copyright 2010 The Apache Software Foundation
     *
     * Licensed to the Apache Software Foundation (ASF) under one
     * or more contributor license agreements.  See the NOTICE file
     * distributed with this work for additional information
     * regarding copyright ownership.  The ASF licenses this file
     * to you under the Apache License, Version 2.0 (the
     * "License"); you may not use this file except in compliance
     * with the License.  You may obtain a copy of the License at
     *
     *     http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */

    public static final int SIZEOF_INT = Integer.SIZE / Byte.SIZE;
    public static final int SIZEOF_LONG = Long.SIZE / Byte.SIZE;

    public static double[] toDoubles(byte[] bytes) {
        int size = toInt(bytes, 0);
        double[] result = new double[size];
        int offset = SIZEOF_INT;
        for (int i = 0; i < size; i++) {
            result[i] = toDouble(bytes, offset);
            offset += SIZEOF_LONG;
        }
        return result;
    }

    private static int toInt(byte[] bytes, int offset) {
        if (offset + SIZEOF_INT > bytes.length) {
            throw new RuntimeException("Cannot decode int from the buffer");
        }
        int n = 0;
        for (int i = offset; i < (offset + SIZEOF_INT); i++) {
            n <<= 8;
            n ^= bytes[i] & 0xFF;
        }
        return n;
    }

    private static double toDouble(byte[] bytes, int offset) {
        return Double.longBitsToDouble(toLong(bytes, offset));
    }

    private static long toLong(byte[] bytes, int offset) {
        if (offset + SIZEOF_LONG > bytes.length) {
            throw new RuntimeException("Cannot decode long from the buffer");
        }
        long l = 0;
        for (int i = offset; i < offset + SIZEOF_LONG; i++) {
            l <<= 8;
            l ^= bytes[i] & 0xFF;
        }
        return l;
    }
}

Related

1. toDoublePow10(long m, int n)
2. toDoublePow2(long m, int n)
3. toDoublePrecision(long fixedPrecisionOrdinate)
4. toDoublePrimitiveArray(final Double[] wrappedArray)
5. toDoubleQuotes(String str)
6. toDoubles(byte[] value, int offset, int num)
7. toDoubles(Double[] values)
8. toDoubles(int[][] intPts)
9. toDoubles(Object[] extraArgs)