Android Array to Primitive Type Convert toPrimitive(Byte[] array, byte valueForNull)

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  5. toPrimitive(Byte[] array, byte valueForNull)

Description

Converts an array of object Bytes to primitives handling null.

This method returns null for a null input array.

License

Apache License

Parameter

Parameter Description
array a <code>Byte</code> array, may be <code>null</code>
valueForNull the value to insert if <code>null</code> found

Return

a byte array, null if null array input

Declaration 

public static byte[] toPrimitive(Byte[] array, byte valueForNull)

Method Source Code

//package com.java2s;
/*/*  w  w  w  . j a  v  a2 s.c o m*/
 * 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 {
    /**
     * An empty immutable <code>long</code> array.
     */
    public static final long[] EMPTY_LONG_ARRAY = new long[0];
    /**
     * An empty immutable <code>int</code> array.
     */
    public static final int[] EMPTY_INT_ARRAY = new int[0];
    /**
     * An empty immutable <code>short</code> array.
     */
    public static final short[] EMPTY_SHORT_ARRAY = new short[0];
    /**
     * An empty immutable <code>byte</code> array.
     */
    public static final byte[] EMPTY_BYTE_ARRAY = new byte[0];
    /**
     * An empty immutable <code>double</code> array.
     */
    public static final double[] EMPTY_DOUBLE_ARRAY = new double[0];
    /**
     * An empty immutable <code>float</code> array.
     */
    public static final float[] EMPTY_FLOAT_ARRAY = new float[0];
    /**
     * An empty immutable <code>boolean</code> array.
     */
    public static final boolean[] EMPTY_BOOLEAN_ARRAY = new boolean[0];
    /**
     * An empty immutable <code>char</code> array.
     */
    public static final char[] EMPTY_CHAR_ARRAY = new char[0];

    /**
     * <p>Converts an array of object Characters to primitives.</p>
     *
     * <p>This method returns <code>null</code> for a <code>null</code> input array.</p>
     *
     * @param array  a <code>Character</code> array, may be <code>null</code>
     * @return a <code>char</code> array, <code>null</code> if null array input
     * @throws NullPointerException if array content is <code>null</code>
     */
    public static char[] toPrimitive(Character[] array) {
        if (array == null) {
            return null;
        } else if (array.length == 0) {
            return EMPTY_CHAR_ARRAY;
        }
        final char[] result = new char[array.length];
        for (int i = 0; i < array.length; i++) {
            result[i] = array[i].charValue();
        }
        return result;
    }

    /**
     * <p>Converts an array of object Character to primitives handling <code>null</code>.</p>
     *
     * <p>This method returns <code>null</code> for a <code>null</code> input array.</p>
     *
     * @param array  a <code>Character</code> array, may be <code>null</code>
     * @param valueForNull  the value to insert if <code>null</code> found
     * @return a <code>char</code> array, <code>null</code> if null array input
     */
    public static char[] toPrimitive(Character[] array, char valueForNull) {
        if (array == null) {
            return null;
        } else if (array.length == 0) {
            return EMPTY_CHAR_ARRAY;
        }
        final char[] result = new char[array.length];
        for (int i = 0; i < array.length; i++) {
            Character b = array[i];
            result[i] = (b == null ? valueForNull : b.charValue());
        }
        return result;
    }

    /**
     * <p>Converts an array of object Longs to primitives.</p>
     *
     * <p>This method returns <code>null</code> for a <code>null</code> input array.</p>
     *
     * @param array  a <code>Long</code> array, may be <code>null</code>
     * @return a <code>long</code> array, <code>null</code> if null array input
     * @throws NullPointerException if array content is <code>null</code>
     */
    public static long[] toPrimitive(Long[] array) {
        if (array == null) {
            return null;
        } else if (array.length == 0) {
            return EMPTY_LONG_ARRAY;
        }
        final long[] result = new long[array.length];
        for (int i = 0; i < array.length; i++) {
            result[i] = array[i].longValue();
        }
        return result;
    }

    /**
     * <p>Converts an array of object Long to primitives handling <code>null</code>.</p>
     *
     * <p>This method returns <code>null</code> for a <code>null</code> input array.</p>
     *
     * @param array  a <code>Long</code> array, may be <code>null</code>
     * @param valueForNull  the value to insert if <code>null</code> found
     * @return a <code>long</code> array, <code>null</code> if null array input
     */
    public static long[] toPrimitive(Long[] array, long valueForNull) {
        if (array == null) {
            return null;
        } else if (array.length == 0) {
            return EMPTY_LONG_ARRAY;
        }
        final long[] result = new long[array.length];
        for (int i = 0; i < array.length; i++) {
            Long b = array[i];
            result[i] = (b == null ? valueForNull : b.longValue());
        }
        return result;
    }

    /**
     * <p>Converts an array of object Integers to primitives.</p>
     *
     * <p>This method returns <code>null</code> for a <code>null</code> input array.</p>
     *
     * @param array  a <code>Integer</code> array, may be <code>null</code>
     * @return an <code>int</code> array, <code>null</code> if null array input
     * @throws NullPointerException if array content is <code>null</code>
     */
    public static int[] toPrimitive(Integer[] array) {
        if (array == null) {
            return null;
        } else if (array.length == 0) {
            return EMPTY_INT_ARRAY;
        }
        final int[] result = new int[array.length];
        for (int i = 0; i < array.length; i++) {
            result[i] = array[i].intValue();
        }
        return result;
    }

    /**
     * <p>Converts an array of object Integer to primitives handling <code>null</code>.</p>
     *
     * <p>This method returns <code>null</code> for a <code>null</code> input array.</p>
     *
     * @param array  a <code>Integer</code> array, may be <code>null</code>
     * @param valueForNull  the value to insert if <code>null</code> found
     * @return an <code>int</code> array, <code>null</code> if null array input
     */
    public static int[] toPrimitive(Integer[] array, int valueForNull) {
        if (array == null) {
            return null;
        } else if (array.length == 0) {
            return EMPTY_INT_ARRAY;
        }
        final int[] result = new int[array.length];
        for (int i = 0; i < array.length; i++) {
            Integer b = array[i];
            result[i] = (b == null ? valueForNull : b.intValue());
        }
        return result;
    }

    /**
     * <p>Converts an array of object Shorts to primitives.</p>
     *
     * <p>This method returns <code>null</code> for a <code>null</code> input array.</p>
     *
     * @param array  a <code>Short</code> array, may be <code>null</code>
     * @return a <code>byte</code> array, <code>null</code> if null array input
     * @throws NullPointerException if array content is <code>null</code>
     */
    public static short[] toPrimitive(Short[] array) {
        if (array == null) {
            return null;
        } else if (array.length == 0) {
            return EMPTY_SHORT_ARRAY;
        }
        final short[] result = new short[array.length];
        for (int i = 0; i < array.length; i++) {
            result[i] = array[i].shortValue();
        }
        return result;
    }

    /**
     * <p>Converts an array of object Short to primitives handling <code>null</code>.</p>
     *
     * <p>This method returns <code>null</code> for a <code>null</code> input array.</p>
     *
     * @param array  a <code>Short</code> array, may be <code>null</code>
     * @param valueForNull  the value to insert if <code>null</code> found
     * @return a <code>byte</code> array, <code>null</code> if null array input
     */
    public static short[] toPrimitive(Short[] array, short valueForNull) {
        if (array == null) {
            return null;
        } else if (array.length == 0) {
            return EMPTY_SHORT_ARRAY;
        }
        final short[] result = new short[array.length];
        for (int i = 0; i < array.length; i++) {
            Short b = array[i];
            result[i] = (b == null ? valueForNull : b.shortValue());
        }
        return result;
    }

    /**
     * <p>Converts an array of object Bytes to primitives.</p>
     *
     * <p>This method returns <code>null</code> for a <code>null</code> input array.</p>
     *
     * @param array  a <code>Byte</code> array, may be <code>null</code>
     * @return a <code>byte</code> array, <code>null</code> if null array input
     * @throws NullPointerException if array content is <code>null</code>
     */
    public static byte[] toPrimitive(Byte[] array) {
        if (array == null) {
            return null;
        } else if (array.length == 0) {
            return EMPTY_BYTE_ARRAY;
        }
        final byte[] result = new byte[array.length];
        for (int i = 0; i < array.length; i++) {
            result[i] = array[i].byteValue();
        }
        return result;
    }

    /**
     * <p>Converts an array of object Bytes to primitives handling <code>null</code>.</p>
     *
     * <p>This method returns <code>null</code> for a <code>null</code> input array.</p>
     *
     * @param array  a <code>Byte</code> array, may be <code>null</code>
     * @param valueForNull  the value to insert if <code>null</code> found
     * @return a <code>byte</code> array, <code>null</code> if null array input
     */
    public static byte[] toPrimitive(Byte[] array, byte valueForNull) {
        if (array == null) {
            return null;
        } else if (array.length == 0) {
            return EMPTY_BYTE_ARRAY;
        }
        final byte[] result = new byte[array.length];
        for (int i = 0; i < array.length; i++) {
            Byte b = array[i];
            result[i] = (b == null ? valueForNull : b.byteValue());
        }
        return result;
    }

    /**
     * <p>Converts an array of object Doubles to primitives.</p>
     *
     * <p>This method returns <code>null</code> for a <code>null</code> input array.</p>
     *
     * @param array  a <code>Double</code> array, may be <code>null</code>
     * @return a <code>double</code> array, <code>null</code> if null array input
     * @throws NullPointerException if array content is <code>null</code>
     */
    public static double[] toPrimitive(Double[] array) {
        if (array == null) {
            return null;
        } else if (array.length == 0) {
            return EMPTY_DOUBLE_ARRAY;
        }
        final double[] result = new double[array.length];
        for (int i = 0; i < array.length; i++) {
            result[i] = array[i].doubleValue();
        }
        return result;
    }

    /**
     * <p>Converts an array of object Doubles to primitives handling <code>null</code>.</p>
     *
     * <p>This method returns <code>null</code> for a <code>null</code> input array.</p>
     *
     * @param array  a <code>Double</code> array, may be <code>null</code>
     * @param valueForNull  the value to insert if <code>null</code> found
     * @return a <code>double</code> array, <code>null</code> if null array input
     */
    public static double[] toPrimitive(Double[] array, double valueForNull) {
        if (array == null) {
            return null;
        } else if (array.length == 0) {
            return EMPTY_DOUBLE_ARRAY;
        }
        final double[] result = new double[array.length];
        for (int i = 0; i < array.length; i++) {
            Double b = array[i];
            result[i] = (b == null ? valueForNull : b.doubleValue());
        }
        return result;
    }

    /**
     * <p>Converts an array of object Floats to primitives.</p>
     *
     * <p>This method returns <code>null</code> for a <code>null</code> input array.</p>
     *
     * @param array  a <code>Float</code> array, may be <code>null</code>
     * @return a <code>float</code> array, <code>null</code> if null array input
     * @throws NullPointerException if array content is <code>null</code>
     */
    public static float[] toPrimitive(Float[] array) {
        if (array == null) {
            return null;
        } else if (array.length == 0) {
            return EMPTY_FLOAT_ARRAY;
        }
        final float[] result = new float[array.length];
        for (int i = 0; i < array.length; i++) {
            result[i] = array[i].floatValue();
        }
        return result;
    }

    /**
     * <p>Converts an array of object Floats to primitives handling <code>null</code>.</p>
     *
     * <p>This method returns <code>null</code> for a <code>null</code> input array.</p>
     *
     * @param array  a <code>Float</code> array, may be <code>null</code>
     * @param valueForNull  the value to insert if <code>null</code> found
     * @return a <code>float</code> array, <code>null</code> if null array input
     */
    public static float[] toPrimitive(Float[] array, float valueForNull) {
        if (array == null) {
            return null;
        } else if (array.length == 0) {
            return EMPTY_FLOAT_ARRAY;
        }
        final float[] result = new float[array.length];
        for (int i = 0; i < array.length; i++) {
            Float b = array[i];
            result[i] = (b == null ? valueForNull : b.floatValue());
        }
        return result;
    }

    /**
     * <p>Converts an array of object Booleans to primitives.</p>
     *
     * <p>This method returns <code>null</code> for a <code>null</code> input array.</p>
     *
     * @param array  a <code>Boolean</code> array, may be <code>null</code>
     * @return a <code>boolean</code> array, <code>null</code> if null array input
     * @throws NullPointerException if array content is <code>null</code>
     */
    public static boolean[] toPrimitive(Boolean[] array) {
        if (array == null) {
            return null;
        } else if (array.length == 0) {
            return EMPTY_BOOLEAN_ARRAY;
        }
        final boolean[] result = new boolean[array.length];
        for (int i = 0; i < array.length; i++) {
            result[i] = array[i].booleanValue();
        }
        return result;
    }

    /**
     * <p>Converts an array of object Booleans to primitives handling <code>null</code>.</p>
     *
     * <p>This method returns <code>null</code> for a <code>null</code> input array.</p>
     *
     * @param array  a <code>Boolean</code> array, may be <code>null</code>
     * @param valueForNull  the value to insert if <code>null</code> found
     * @return a <code>boolean</code> array, <code>null</code> if null array input
     */
    public static boolean[] toPrimitive(Boolean[] array,
            boolean valueForNull) {
        if (array == null) {
            return null;
        } else if (array.length == 0) {
            return EMPTY_BOOLEAN_ARRAY;
        }
        final boolean[] result = new boolean[array.length];
        for (int i = 0; i < array.length; i++) {
            Boolean b = array[i];
            result[i] = (b == null ? valueForNull : b.booleanValue());
        }
        return result;
    }
}

Related

  1. toCharArray(Object[] array)
  2. toPrimitive(Boolean[] array)
  3. toPrimitive(Boolean[] array, boolean valueForNull)
  4. toPrimitive(Byte[] array)
  5. toPrimitive(Character[] array)
  6. toPrimitive(Character[] array, char valueForNull)
  7. toPrimitive(Double[] array)
  8. toPrimitive(Double[] array, double valueForNull)