Converts an array of object Characters to primitives. - Android java.lang

Description

Converts an array of object Characters to primitives.

Demo Code

/*/*  w  w  w. jav  a  2  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.
 */
//package com.java2s;

public class Main {
    /**
     * An empty immutable {@code long} array.
     */
    public static final long[] EMPTY_LONG_ARRAY = new long[0];
    /**
     * An empty immutable {@code int} array.
     */
    public static final int[] EMPTY_INT_ARRAY = new int[0];
    /**
     * An empty immutable {@code short} array.
     */
    public static final short[] EMPTY_SHORT_ARRAY = new short[0];
    /**
     * An empty immutable {@code byte} array.
     */
    public static final byte[] EMPTY_BYTE_ARRAY = new byte[0];
    /**
     * An empty immutable {@code double} array.
     */
    public static final double[] EMPTY_DOUBLE_ARRAY = new double[0];
    /**
     * An empty immutable {@code float} array.
     */
    public static final float[] EMPTY_FLOAT_ARRAY = new float[0];
    /**
     * An empty immutable {@code boolean} array.
     */
    public static final boolean[] EMPTY_BOOLEAN_ARRAY = new boolean[0];
    /**
     * An empty immutable {@code char} 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} for a {@code null} input array.</p>
     *
     * @param array  a {@code Character} array, may be {@code null}
     * @return a {@code char} array, {@code null} if null array input
     * @throws NullPointerException if array content is {@code null}
     */
    public static char[] toPrimitive(final 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}.</p>
     *
     * <p>This method returns {@code null} for a {@code null} input array.</p>
     *
     * @param array  a {@code Character} array, may be {@code null}
     * @param valueForNull  the value to insert if {@code null} found
     * @return a {@code char} array, {@code null} if null array input
     */
    public static char[] toPrimitive(final Character[] array,
            final 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++) {
            final 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} for a {@code null} input array.</p>
     *
     * @param array  a {@code Long} array, may be {@code null}
     * @return a {@code long} array, {@code null} if null array input
     * @throws NullPointerException if array content is {@code null}
     */
    public static long[] toPrimitive(final 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}.</p>
     *
     * <p>This method returns {@code null} for a {@code null} input array.</p>
     *
     * @param array  a {@code Long} array, may be {@code null}
     * @param valueForNull  the value to insert if {@code null} found
     * @return a {@code long} array, {@code null} if null array input
     */
    public static long[] toPrimitive(final Long[] array,
            final 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++) {
            final 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} for a {@code null} input array.</p>
     *
     * @param array  a {@code Integer} array, may be {@code null}
     * @return an {@code int} array, {@code null} if null array input
     * @throws NullPointerException if array content is {@code null}
     */
    public static int[] toPrimitive(final 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}.</p>
     *
     * <p>This method returns {@code null} for a {@code null} input array.</p>
     *
     * @param array  a {@code Integer} array, may be {@code null}
     * @param valueForNull  the value to insert if {@code null} found
     * @return an {@code int} array, {@code null} if null array input
     */
    public static int[] toPrimitive(final Integer[] array,
            final 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++) {
            final 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} for a {@code null} input array.</p>
     *
     * @param array  a {@code Short} array, may be {@code null}
     * @return a {@code byte} array, {@code null} if null array input
     * @throws NullPointerException if array content is {@code null}
     */
    public static short[] toPrimitive(final 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}.</p>
     *
     * <p>This method returns {@code null} for a {@code null} input array.</p>
     *
     * @param array  a {@code Short} array, may be {@code null}
     * @param valueForNull  the value to insert if {@code null} found
     * @return a {@code byte} array, {@code null} if null array input
     */
    public static short[] toPrimitive(final Short[] array,
            final 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++) {
            final 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} for a {@code null} input array.</p>
     *
     * @param array  a {@code Byte} array, may be {@code null}
     * @return a {@code byte} array, {@code null} if null array input
     * @throws NullPointerException if array content is {@code null}
     */
    public static byte[] toPrimitive(final 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}.</p>
     *
     * <p>This method returns {@code null} for a {@code null} input array.</p>
     *
     * @param array  a {@code Byte} array, may be {@code null}
     * @param valueForNull  the value to insert if {@code null} found
     * @return a {@code byte} array, {@code null} if null array input
     */
    public static byte[] toPrimitive(final Byte[] array,
            final 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++) {
            final 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} for a {@code null} input array.</p>
     *
     * @param array  a {@code Double} array, may be {@code null}
     * @return a {@code double} array, {@code null} if null array input
     * @throws NullPointerException if array content is {@code null}
     */
    public static double[] toPrimitive(final 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}.</p>
     *
     * <p>This method returns {@code null} for a {@code null} input array.</p>
     *
     * @param array  a {@code Double} array, may be {@code null}
     * @param valueForNull  the value to insert if {@code null} found
     * @return a {@code double} array, {@code null} if null array input
     */
    public static double[] toPrimitive(final Double[] array,
            final 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++) {
            final 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} for a {@code null} input array.</p>
     *
     * @param array  a {@code Float} array, may be {@code null}
     * @return a {@code float} array, {@code null} if null array input
     * @throws NullPointerException if array content is {@code null}
     */
    public static float[] toPrimitive(final 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}.</p>
     *
     * <p>This method returns {@code null} for a {@code null} input array.</p>
     *
     * @param array  a {@code Float} array, may be {@code null}
     * @param valueForNull  the value to insert if {@code null} found
     * @return a {@code float} array, {@code null} if null array input
     */
    public static float[] toPrimitive(final Float[] array,
            final 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++) {
            final 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} for a {@code null} input array.</p>
     *
     * @param array  a {@code Boolean} array, may be {@code null}
     * @return a {@code boolean} array, {@code null} if null array input
     * @throws NullPointerException if array content is {@code null}
     */
    public static boolean[] toPrimitive(final 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}.</p>
     *
     * <p>This method returns {@code null} for a {@code null} input array.</p>
     *
     * @param array  a {@code Boolean} array, may be {@code null}
     * @param valueForNull  the value to insert if {@code null} found
     * @return a {@code boolean} array, {@code null} if null array input
     */
    public static boolean[] toPrimitive(final Boolean[] array,
            final 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++) {
            final Boolean b = array[i];
            result[i] = (b == null ? valueForNull : b.booleanValue());
        }
        return result;
    }
}

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