com.laud.doodo.spring.utils.SpringObjectUtils.java Source code

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/*
 * Copyright 2002-2011 the original author or authors.
 *
 * Licensed 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.laud.doodo.spring.utils;

import java.lang.reflect.Array;
import java.util.Arrays;

/**
 * Miscellaneous object utility methods.
 * 
 * <p>
 * Mainly for internal use within the framework; consider <a
 * href="http://jakarta.apache.org/commons/lang/">Jakarta's Commons Lang</a> for
 * a more comprehensive suite of object utilities.
 * 
 * <p>
 * Thanks to Alex Ruiz for contributing several enhancements to this class!
 * 
 * @author Juergen Hoeller
 * @author Keith Donald
 * @author Rod Johnson
 * @author Rob Harrop
 * @author Chris Beams
 * @since 19.03.2004
 * @see org.apache.commons.lang.ObjectUtils
 */
public abstract class SpringObjectUtils {

    private static final int INITIAL_HASH = 7;
    private static final int MULTIPLIER = 31;

    private static final String EMPTY_STRING = "";
    private static final String NULL_STRING = "null";
    private static final String ARRAY_START = "{";
    private static final String ARRAY_END = "}";
    private static final String EMPTY_ARRAY = ARRAY_START + ARRAY_END;
    private static final String ARRAY_ELEMENT_SEPARATOR = ", ";

    /**
     * Return whether the given throwable is a checked exception: that is,
     * neither a RuntimeException nor an Error.
     * 
     * @param ex
     *            the throwable to check
     * @return whether the throwable is a checked exception
     * @see java.lang.Exception
     * @see java.lang.RuntimeException
     * @see java.lang.Error
     */
    public static boolean isCheckedException(Throwable ex) {
        return !(ex instanceof RuntimeException || ex instanceof Error);
    }

    /**
     * Check whether the given exception is compatible with the exceptions
     * declared in a throws clause.
     * 
     * @param ex
     *            the exception to checked
     * @param declaredExceptions
     *            the exceptions declared in the throws clause
     * @return whether the given exception is compatible
     */
    public static boolean isCompatibleWithThrowsClause(Throwable ex, Class<?>[] declaredExceptions) {
        if (!isCheckedException(ex)) {
            return true;
        }
        if (declaredExceptions != null) {
            int i = 0;
            while (i < declaredExceptions.length) {
                if (declaredExceptions[i].isAssignableFrom(ex.getClass())) {
                    return true;
                }
                i++;
            }
        }
        return false;
    }

    /**
     * Determine whether the given object is an array: either an Object array or
     * a primitive array.
     * 
     * @param obj
     *            the object to check
     */
    public static boolean isArray(Object obj) {
        return (obj != null && obj.getClass().isArray());
    }

    /**
     * Determine whether the given array is empty: i.e. <code>null</code> or of
     * zero length.
     * 
     * @param array
     *            the array to check
     */
    public static boolean isEmpty(Object[] array) {
        return (array == null || array.length == 0);
    }

    /**
     * Check whether the given array contains the given element.
     * 
     * @param array
     *            the array to check (may be <code>null</code>, in which case
     *            the return value will always be <code>false</code>)
     * @param element
     *            the element to check for
     * @return whether the element has been found in the given array
     */
    public static boolean containsElement(Object[] array, Object element) {
        if (array == null) {
            return false;
        }
        for (Object arrayEle : array) {
            if (nullSafeEquals(arrayEle, element)) {
                return true;
            }
        }
        return false;
    }

    /**
     * Check whether the given array of enum constants contains a constant with
     * the given name, ignoring case when determining a match.
     * 
     * @param enumValues
     *            the enum values to check, typically the product of a call to
     *            MyEnum.values()
     * @param constant
     *            the constant name to find (must not be null or empty string)
     * @return whether the constant has been found in the given array
     */
    public static boolean containsConstant(Enum<?>[] enumValues, String constant) {
        return containsConstant(enumValues, constant, false);
    }

    /**
     * Check whether the given array of enum constants contains a constant with
     * the given name.
     * 
     * @param enumValues
     *            the enum values to check, typically the product of a call to
     *            MyEnum.values()
     * @param constant
     *            the constant name to find (must not be null or empty string)
     * @param caseSensitive
     *            whether case is significant in determining a match
     * @return whether the constant has been found in the given array
     */
    public static boolean containsConstant(Enum<?>[] enumValues, String constant, boolean caseSensitive) {
        for (Enum<?> candidate : enumValues) {
            if (caseSensitive ? candidate.toString().equals(constant)
                    : candidate.toString().equalsIgnoreCase(constant)) {
                return true;
            }
        }
        return false;
    }

    /**
     * Case insensitive alternative to {@link Enum#valueOf(Class, String)}.
     * 
     * @param <E>
     *            the concrete Enum type
     * @param enumValues
     *            the array of all Enum constants in question, usually per
     *            Enum.values()
     * @param constant
     *            the constant to get the enum value of
     * @throws IllegalArgumentException
     *             if the given constant is not found in the given array of enum
     *             values. Use {@link #containsConstant(Enum[], String)} as a
     *             guard to avoid this exception.
     */
    public static <E extends Enum<?>> E caseInsensitiveValueOf(E[] enumValues, String constant) {
        for (E candidate : enumValues) {
            if (candidate.toString().equalsIgnoreCase(constant)) {
                return candidate;
            }
        }
        throw new IllegalArgumentException(String.format("constant [%s] does not exist in enum type %s", constant,
                enumValues.getClass().getComponentType().getName()));
    }

    /**
     * Append the given object to the given array, returning a new array
     * consisting of the input array contents plus the given object.
     * 
     * @param array
     *            the array to append to (can be <code>null</code>)
     * @param obj
     *            the object to append
     * @return the new array (of the same component type; never
     *         <code>null</code>)
     */
    public static <A, O extends A> A[] addObjectToArray(A[] array, O obj) {
        Class<?> compType = Object.class;
        if (array != null) {
            compType = array.getClass().getComponentType();
        } else if (obj != null) {
            compType = obj.getClass();
        }
        int newArrLength = (array != null ? array.length + 1 : 1);
        @SuppressWarnings("unchecked")
        A[] newArr = (A[]) Array.newInstance(compType, newArrLength);
        if (array != null) {
            System.arraycopy(array, 0, newArr, 0, array.length);
        }
        newArr[newArr.length - 1] = obj;
        return newArr;
    }

    /**
     * Convert the given array (which may be a primitive array) to an object
     * array (if necessary of primitive wrapper objects).
     * <p>
     * A <code>null</code> source value will be converted to an empty Object
     * array.
     * 
     * @param source
     *            the (potentially primitive) array
     * @return the corresponding object array (never <code>null</code>)
     * @throws IllegalArgumentException
     *             if the parameter is not an array
     */
    public static Object[] toObjectArray(Object source) {
        if (source instanceof Object[]) {
            return (Object[]) source;
        }
        if (source == null) {
            return new Object[0];
        }
        if (!source.getClass().isArray()) {
            throw new IllegalArgumentException("Source is not an array: " + source);
        }
        int length = Array.getLength(source);
        if (length == 0) {
            return new Object[0];
        }
        Class<?> wrapperType = Array.get(source, 0).getClass();
        Object[] newArray = (Object[]) Array.newInstance(wrapperType, length);
        for (int i = 0; i < length; i++) {
            newArray[i] = Array.get(source, i);
        }
        return newArray;
    }

    // ---------------------------------------------------------------------
    // Convenience methods for content-based equality/hash-code handling
    // ---------------------------------------------------------------------

    /**
     * Determine if the given objects are equal, returning <code>true</code> if
     * both are <code>null</code> or <code>false</code> if only one is
     * <code>null</code>.
     * <p>
     * Compares arrays with <code>Arrays.equals</code>, performing an equality
     * check based on the array elements rather than the array reference.
     * 
     * @param o1
     *            first Object to compare
     * @param o2
     *            second Object to compare
     * @return whether the given objects are equal
     * @see java.util.Arrays#equals
     */
    public static boolean nullSafeEquals(Object o1, Object o2) {
        if (o1 == o2) {
            return true;
        }
        if (o1 == null || o2 == null) {
            return false;
        }
        if (o1.equals(o2)) {
            return true;
        }
        if (o1.getClass().isArray() && o2.getClass().isArray()) {
            if (o1 instanceof Object[] && o2 instanceof Object[]) {
                return Arrays.equals((Object[]) o1, (Object[]) o2);
            }
            if (o1 instanceof boolean[] && o2 instanceof boolean[]) {
                return Arrays.equals((boolean[]) o1, (boolean[]) o2);
            }
            if (o1 instanceof byte[] && o2 instanceof byte[]) {
                return Arrays.equals((byte[]) o1, (byte[]) o2);
            }
            if (o1 instanceof char[] && o2 instanceof char[]) {
                return Arrays.equals((char[]) o1, (char[]) o2);
            }
            if (o1 instanceof double[] && o2 instanceof double[]) {
                return Arrays.equals((double[]) o1, (double[]) o2);
            }
            if (o1 instanceof float[] && o2 instanceof float[]) {
                return Arrays.equals((float[]) o1, (float[]) o2);
            }
            if (o1 instanceof int[] && o2 instanceof int[]) {
                return Arrays.equals((int[]) o1, (int[]) o2);
            }
            if (o1 instanceof long[] && o2 instanceof long[]) {
                return Arrays.equals((long[]) o1, (long[]) o2);
            }
            if (o1 instanceof short[] && o2 instanceof short[]) {
                return Arrays.equals((short[]) o1, (short[]) o2);
            }
        }
        return false;
    }

    /**
     * Return as hash code for the given object; typically the value of
     * <code>{@link Object#hashCode()}</code>. If the object is an array, this
     * method will delegate to any of the <code>nullSafeHashCode</code> methods
     * for arrays in this class. If the object is <code>null</code>, this method
     * returns 0.
     * 
     * @see #nullSafeHashCode(Object[])
     * @see #nullSafeHashCode(boolean[])
     * @see #nullSafeHashCode(byte[])
     * @see #nullSafeHashCode(char[])
     * @see #nullSafeHashCode(double[])
     * @see #nullSafeHashCode(float[])
     * @see #nullSafeHashCode(int[])
     * @see #nullSafeHashCode(long[])
     * @see #nullSafeHashCode(short[])
     */
    public static int nullSafeHashCode(Object obj) {
        if (obj == null) {
            return 0;
        }
        if (obj.getClass().isArray()) {
            if (obj instanceof Object[]) {
                return nullSafeHashCode((Object[]) obj);
            }
            if (obj instanceof boolean[]) {
                return nullSafeHashCode((boolean[]) obj);
            }
            if (obj instanceof byte[]) {
                return nullSafeHashCode((byte[]) obj);
            }
            if (obj instanceof char[]) {
                return nullSafeHashCode((char[]) obj);
            }
            if (obj instanceof double[]) {
                return nullSafeHashCode((double[]) obj);
            }
            if (obj instanceof float[]) {
                return nullSafeHashCode((float[]) obj);
            }
            if (obj instanceof int[]) {
                return nullSafeHashCode((int[]) obj);
            }
            if (obj instanceof long[]) {
                return nullSafeHashCode((long[]) obj);
            }
            if (obj instanceof short[]) {
                return nullSafeHashCode((short[]) obj);
            }
        }
        return obj.hashCode();
    }

    /**
     * Return a hash code based on the contents of the specified array. If
     * <code>array</code> is <code>null</code>, this method returns 0.
     */
    public static int nullSafeHashCode(Object[] array) {
        if (array == null) {
            return 0;
        }
        int hash = INITIAL_HASH;
        int arraySize = array.length;
        for (int i = 0; i < arraySize; i++) {
            hash = MULTIPLIER * hash + nullSafeHashCode(array[i]);
        }
        return hash;
    }

    /**
     * Return a hash code based on the contents of the specified array. If
     * <code>array</code> is <code>null</code>, this method returns 0.
     */
    public static int nullSafeHashCode(boolean[] array) {
        if (array == null) {
            return 0;
        }
        int hash = INITIAL_HASH;
        int arraySize = array.length;
        for (int i = 0; i < arraySize; i++) {
            hash = MULTIPLIER * hash + hashCode(array[i]);
        }
        return hash;
    }

    /**
     * Return a hash code based on the contents of the specified array. If
     * <code>array</code> is <code>null</code>, this method returns 0.
     */
    public static int nullSafeHashCode(byte[] array) {
        if (array == null) {
            return 0;
        }
        int hash = INITIAL_HASH;
        int arraySize = array.length;
        for (int i = 0; i < arraySize; i++) {
            hash = MULTIPLIER * hash + array[i];
        }
        return hash;
    }

    /**
     * Return a hash code based on the contents of the specified array. If
     * <code>array</code> is <code>null</code>, this method returns 0.
     */
    public static int nullSafeHashCode(char[] array) {
        if (array == null) {
            return 0;
        }
        int hash = INITIAL_HASH;
        int arraySize = array.length;
        for (int i = 0; i < arraySize; i++) {
            hash = MULTIPLIER * hash + array[i];
        }
        return hash;
    }

    /**
     * Return a hash code based on the contents of the specified array. If
     * <code>array</code> is <code>null</code>, this method returns 0.
     */
    public static int nullSafeHashCode(double[] array) {
        if (array == null) {
            return 0;
        }
        int hash = INITIAL_HASH;
        int arraySize = array.length;
        for (int i = 0; i < arraySize; i++) {
            hash = MULTIPLIER * hash + hashCode(array[i]);
        }
        return hash;
    }

    /**
     * Return a hash code based on the contents of the specified array. If
     * <code>array</code> is <code>null</code>, this method returns 0.
     */
    public static int nullSafeHashCode(float[] array) {
        if (array == null) {
            return 0;
        }
        int hash = INITIAL_HASH;
        int arraySize = array.length;
        for (int i = 0; i < arraySize; i++) {
            hash = MULTIPLIER * hash + hashCode(array[i]);
        }
        return hash;
    }

    /**
     * Return a hash code based on the contents of the specified array. If
     * <code>array</code> is <code>null</code>, this method returns 0.
     */
    public static int nullSafeHashCode(int[] array) {
        if (array == null) {
            return 0;
        }
        int hash = INITIAL_HASH;
        int arraySize = array.length;
        for (int i = 0; i < arraySize; i++) {
            hash = MULTIPLIER * hash + array[i];
        }
        return hash;
    }

    /**
     * Return a hash code based on the contents of the specified array. If
     * <code>array</code> is <code>null</code>, this method returns 0.
     */
    public static int nullSafeHashCode(long[] array) {
        if (array == null) {
            return 0;
        }
        int hash = INITIAL_HASH;
        int arraySize = array.length;
        for (int i = 0; i < arraySize; i++) {
            hash = MULTIPLIER * hash + hashCode(array[i]);
        }
        return hash;
    }

    /**
     * Return a hash code based on the contents of the specified array. If
     * <code>array</code> is <code>null</code>, this method returns 0.
     */
    public static int nullSafeHashCode(short[] array) {
        if (array == null) {
            return 0;
        }
        int hash = INITIAL_HASH;
        int arraySize = array.length;
        for (int i = 0; i < arraySize; i++) {
            hash = MULTIPLIER * hash + array[i];
        }
        return hash;
    }

    /**
     * Return the same value as <code>{@link Boolean#hashCode()}</code>.
     * 
     * @see Boolean#hashCode()
     */
    public static int hashCode(boolean bool) {
        return bool ? 1231 : 1237;
    }

    /**
     * Return the same value as <code>{@link Double#hashCode()}</code>.
     * 
     * @see Double#hashCode()
     */
    public static int hashCode(double dbl) {
        long bits = Double.doubleToLongBits(dbl);
        return hashCode(bits);
    }

    /**
     * Return the same value as <code>{@link Float#hashCode()}</code>.
     * 
     * @see Float#hashCode()
     */
    public static int hashCode(float flt) {
        return Float.floatToIntBits(flt);
    }

    /**
     * Return the same value as <code>{@link Long#hashCode()}</code>.
     * 
     * @see Long#hashCode()
     */
    public static int hashCode(long lng) {
        return (int) (lng ^ (lng >>> 32));
    }

    // ---------------------------------------------------------------------
    // Convenience methods for toString output
    // ---------------------------------------------------------------------

    /**
     * Return a String representation of an object's overall identity.
     * 
     * @param obj
     *            the object (may be <code>null</code>)
     * @return the object's identity as String representation, or an empty
     *         String if the object was <code>null</code>
     */
    public static String identityToString(Object obj) {
        if (obj == null) {
            return EMPTY_STRING;
        }
        return obj.getClass().getName() + "@" + getIdentityHexString(obj);
    }

    /**
     * Return a hex String form of an object's identity hash code.
     * 
     * @param obj
     *            the object
     * @return the object's identity code in hex notation
     */
    public static String getIdentityHexString(Object obj) {
        return Integer.toHexString(System.identityHashCode(obj));
    }

    /**
     * Return a content-based String representation if <code>obj</code> is not
     * <code>null</code>; otherwise returns an empty String.
     * <p>
     * Differs from {@link #nullSafeToString(Object)} in that it returns an
     * empty String rather than "null" for a <code>null</code> value.
     * 
     * @param obj
     *            the object to build a display String for
     * @return a display String representation of <code>obj</code>
     * @see #nullSafeToString(Object)
     */
    public static String getDisplayString(Object obj) {
        if (obj == null) {
            return EMPTY_STRING;
        }
        return nullSafeToString(obj);
    }

    /**
     * Determine the class name for the given object.
     * <p>
     * Returns <code>"null"</code> if <code>obj</code> is <code>null</code>.
     * 
     * @param obj
     *            the object to introspect (may be <code>null</code>)
     * @return the corresponding class name
     */
    public static String nullSafeClassName(Object obj) {
        return (obj != null ? obj.getClass().getName() : NULL_STRING);
    }

    /**
     * Return a String representation of the specified Object.
     * <p>
     * Builds a String representation of the contents in case of an array.
     * Returns <code>"null"</code> if <code>obj</code> is <code>null</code>.
     * 
     * @param obj
     *            the object to build a String representation for
     * @return a String representation of <code>obj</code>
     */
    public static String nullSafeToString(Object obj) {
        if (obj == null) {
            return NULL_STRING;
        }
        if (obj instanceof String) {
            return (String) obj;
        }
        if (obj instanceof Object[]) {
            return nullSafeToString((Object[]) obj);
        }
        if (obj instanceof boolean[]) {
            return nullSafeToString((boolean[]) obj);
        }
        if (obj instanceof byte[]) {
            return nullSafeToString((byte[]) obj);
        }
        if (obj instanceof char[]) {
            return nullSafeToString((char[]) obj);
        }
        if (obj instanceof double[]) {
            return nullSafeToString((double[]) obj);
        }
        if (obj instanceof float[]) {
            return nullSafeToString((float[]) obj);
        }
        if (obj instanceof int[]) {
            return nullSafeToString((int[]) obj);
        }
        if (obj instanceof long[]) {
            return nullSafeToString((long[]) obj);
        }
        if (obj instanceof short[]) {
            return nullSafeToString((short[]) obj);
        }
        String str = obj.toString();
        return (str != null ? str : EMPTY_STRING);
    }

    /**
     * Return a String representation of the contents of the specified array.
     * <p>
     * The String representation consists of a list of the array's elements,
     * enclosed in curly braces (<code>"{}"</code>). Adjacent elements are
     * separated by the characters <code>", "</code> (a comma followed by a
     * space). Returns <code>"null"</code> if <code>array</code> is
     * <code>null</code>.
     * 
     * @param array
     *            the array to build a String representation for
     * @return a String representation of <code>array</code>
     */
    public static String nullSafeToString(Object[] array) {
        if (array == null) {
            return NULL_STRING;
        }
        int length = array.length;
        if (length == 0) {
            return EMPTY_ARRAY;
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            if (i == 0) {
                sb.append(ARRAY_START);
            } else {
                sb.append(ARRAY_ELEMENT_SEPARATOR);
            }
            sb.append(String.valueOf(array[i]));
        }
        sb.append(ARRAY_END);
        return sb.toString();
    }

    /**
     * Return a String representation of the contents of the specified array.
     * <p>
     * The String representation consists of a list of the array's elements,
     * enclosed in curly braces (<code>"{}"</code>). Adjacent elements are
     * separated by the characters <code>", "</code> (a comma followed by a
     * space). Returns <code>"null"</code> if <code>array</code> is
     * <code>null</code>.
     * 
     * @param array
     *            the array to build a String representation for
     * @return a String representation of <code>array</code>
     */
    public static String nullSafeToString(boolean[] array) {
        if (array == null) {
            return NULL_STRING;
        }
        int length = array.length;
        if (length == 0) {
            return EMPTY_ARRAY;
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            if (i == 0) {
                sb.append(ARRAY_START);
            } else {
                sb.append(ARRAY_ELEMENT_SEPARATOR);
            }

            sb.append(array[i]);
        }
        sb.append(ARRAY_END);
        return sb.toString();
    }

    /**
     * Return a String representation of the contents of the specified array.
     * <p>
     * The String representation consists of a list of the array's elements,
     * enclosed in curly braces (<code>"{}"</code>). Adjacent elements are
     * separated by the characters <code>", "</code> (a comma followed by a
     * space). Returns <code>"null"</code> if <code>array</code> is
     * <code>null</code>.
     * 
     * @param array
     *            the array to build a String representation for
     * @return a String representation of <code>array</code>
     */
    public static String nullSafeToString(byte[] array) {
        if (array == null) {
            return NULL_STRING;
        }
        int length = array.length;
        if (length == 0) {
            return EMPTY_ARRAY;
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            if (i == 0) {
                sb.append(ARRAY_START);
            } else {
                sb.append(ARRAY_ELEMENT_SEPARATOR);
            }
            sb.append(array[i]);
        }
        sb.append(ARRAY_END);
        return sb.toString();
    }

    /**
     * Return a String representation of the contents of the specified array.
     * <p>
     * The String representation consists of a list of the array's elements,
     * enclosed in curly braces (<code>"{}"</code>). Adjacent elements are
     * separated by the characters <code>", "</code> (a comma followed by a
     * space). Returns <code>"null"</code> if <code>array</code> is
     * <code>null</code>.
     * 
     * @param array
     *            the array to build a String representation for
     * @return a String representation of <code>array</code>
     */
    public static String nullSafeToString(char[] array) {
        if (array == null) {
            return NULL_STRING;
        }
        int length = array.length;
        if (length == 0) {
            return EMPTY_ARRAY;
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            if (i == 0) {
                sb.append(ARRAY_START);
            } else {
                sb.append(ARRAY_ELEMENT_SEPARATOR);
            }
            sb.append("'").append(array[i]).append("'");
        }
        sb.append(ARRAY_END);
        return sb.toString();
    }

    /**
     * Return a String representation of the contents of the specified array.
     * <p>
     * The String representation consists of a list of the array's elements,
     * enclosed in curly braces (<code>"{}"</code>). Adjacent elements are
     * separated by the characters <code>", "</code> (a comma followed by a
     * space). Returns <code>"null"</code> if <code>array</code> is
     * <code>null</code>.
     * 
     * @param array
     *            the array to build a String representation for
     * @return a String representation of <code>array</code>
     */
    public static String nullSafeToString(double[] array) {
        if (array == null) {
            return NULL_STRING;
        }
        int length = array.length;
        if (length == 0) {
            return EMPTY_ARRAY;
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            if (i == 0) {
                sb.append(ARRAY_START);
            } else {
                sb.append(ARRAY_ELEMENT_SEPARATOR);
            }

            sb.append(array[i]);
        }
        sb.append(ARRAY_END);
        return sb.toString();
    }

    /**
     * Return a String representation of the contents of the specified array.
     * <p>
     * The String representation consists of a list of the array's elements,
     * enclosed in curly braces (<code>"{}"</code>). Adjacent elements are
     * separated by the characters <code>", "</code> (a comma followed by a
     * space). Returns <code>"null"</code> if <code>array</code> is
     * <code>null</code>.
     * 
     * @param array
     *            the array to build a String representation for
     * @return a String representation of <code>array</code>
     */
    public static String nullSafeToString(float[] array) {
        if (array == null) {
            return NULL_STRING;
        }
        int length = array.length;
        if (length == 0) {
            return EMPTY_ARRAY;
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            if (i == 0) {
                sb.append(ARRAY_START);
            } else {
                sb.append(ARRAY_ELEMENT_SEPARATOR);
            }

            sb.append(array[i]);
        }
        sb.append(ARRAY_END);
        return sb.toString();
    }

    /**
     * Return a String representation of the contents of the specified array.
     * <p>
     * The String representation consists of a list of the array's elements,
     * enclosed in curly braces (<code>"{}"</code>). Adjacent elements are
     * separated by the characters <code>", "</code> (a comma followed by a
     * space). Returns <code>"null"</code> if <code>array</code> is
     * <code>null</code>.
     * 
     * @param array
     *            the array to build a String representation for
     * @return a String representation of <code>array</code>
     */
    public static String nullSafeToString(int[] array) {
        if (array == null) {
            return NULL_STRING;
        }
        int length = array.length;
        if (length == 0) {
            return EMPTY_ARRAY;
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            if (i == 0) {
                sb.append(ARRAY_START);
            } else {
                sb.append(ARRAY_ELEMENT_SEPARATOR);
            }
            sb.append(array[i]);
        }
        sb.append(ARRAY_END);
        return sb.toString();
    }

    /**
     * Return a String representation of the contents of the specified array.
     * <p>
     * The String representation consists of a list of the array's elements,
     * enclosed in curly braces (<code>"{}"</code>). Adjacent elements are
     * separated by the characters <code>", "</code> (a comma followed by a
     * space). Returns <code>"null"</code> if <code>array</code> is
     * <code>null</code>.
     * 
     * @param array
     *            the array to build a String representation for
     * @return a String representation of <code>array</code>
     */
    public static String nullSafeToString(long[] array) {
        if (array == null) {
            return NULL_STRING;
        }
        int length = array.length;
        if (length == 0) {
            return EMPTY_ARRAY;
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            if (i == 0) {
                sb.append(ARRAY_START);
            } else {
                sb.append(ARRAY_ELEMENT_SEPARATOR);
            }
            sb.append(array[i]);
        }
        sb.append(ARRAY_END);
        return sb.toString();
    }

    /**
     * Return a String representation of the contents of the specified array.
     * <p>
     * The String representation consists of a list of the array's elements,
     * enclosed in curly braces (<code>"{}"</code>). Adjacent elements are
     * separated by the characters <code>", "</code> (a comma followed by a
     * space). Returns <code>"null"</code> if <code>array</code> is
     * <code>null</code>.
     * 
     * @param array
     *            the array to build a String representation for
     * @return a String representation of <code>array</code>
     */
    public static String nullSafeToString(short[] array) {
        if (array == null) {
            return NULL_STRING;
        }
        int length = array.length;
        if (length == 0) {
            return EMPTY_ARRAY;
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            if (i == 0) {
                sb.append(ARRAY_START);
            } else {
                sb.append(ARRAY_ELEMENT_SEPARATOR);
            }
            sb.append(array[i]);
        }
        sb.append(ARRAY_END);
        return sb.toString();
    }

}