Main.java Source code

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Here is the source code for Main.java

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//package com.java2s;
//License from project: Open Source License 

import java.util.Collection;
import java.util.Map;
import org.json.JSONArray;

public class Main {
    /** Empty string singleton. */
    private static final String SAFE_STRING = "";

    /**
     * Returns empty string if the original one is null.
     *
     * @param original
     *          original string
     * @return string
     */
    public static String safeString(final String original) {
        return safeString(original, safeString());
    }

    /**
     * Returns default string if the original one is empty.
     *
     * @param original
     *          original string
     * @param defaultValue
     *          default string value
     * @return string
     */
    public static String safeString(final String original, final String defaultValue) {
        return isNotEmpty(original) ? original : defaultValue;
    }

    /**
     * Returns empty safe string.
     *
     * @return a safe empty string
     */
    public static String safeString() {
        return SAFE_STRING;
    }

    /**
     * Checks if the given string is not empty.
     *
     * @param s
     *          string
     * @return <code>true</code> if the given reference is not <code>null</code> and string is not empty
     */
    public static boolean isNotEmpty(final String s) {
        return length(s) > 0;
    }

    /**
     * Checks if the given array is not empty.
     *
     * @param array
     *          array to check
     * @return <code>true</code> if the given reference is not <code>null</code> and string is not empty
     */
    public static boolean isNotEmpty(final boolean[] array) {
        return length(array) > 0;
    }

    /**
     * Checks if the given array is not empty.
     *
     * @param array
     *          array to check
     * @return <code>true</code> if the given reference is not <code>null</code> and array is not empty
     */
    public static boolean isNotEmpty(final byte[] array) {
        return length(array) > 0;
    }

    /**
     * Checks if the given array is not empty.
     *
     * @param array
     *          array to check
     * @return <code>true</code> if the given reference is not <code>null</code> and array is not empty
     */
    public static boolean isNotEmpty(final short[] array) {
        return length(array) > 0;
    }

    /**
     * Checks if the given array is not empty.
     *
     * @param array
     *          array to check
     * @return <code>true</code> if the given reference is not <code>null</code> and array is not empty
     */
    public static boolean isNotEmpty(final int[] array) {
        return length(array) > 0;
    }

    /**
     * Checks if the given array is not empty.
     *
     * @param array
     *          array to check
     * @return <code>true</code> if the given reference is not <code>null</code> and array is not empty
     */
    public static boolean isNotEmpty(final long[] array) {
        return length(array) > 0;
    }

    /**
     * Checks if the given array is not empty.
     *
     * @param array
     *          array to check
     * @return <code>true</code> if the given reference is not <code>null</code> and array is not empty
     */
    public static boolean isNotEmpty(final float[] array) {
        return length(array) > 0;
    }

    /**
     * Checks if the given array is not empty.
     *
     * @param array
     *          array to check
     * @return <code>true</code> if the given reference is not <code>null</code> and array is not empty
     */
    public static boolean isNotEmpty(final double[] array) {
        return length(array) > 0;
    }

    /**
     * Checks if the given array is not empty.
     *
     * @param array
     *          array to check
     * @return <code>true</code> if the given reference is not <code>null</code> and array is not empty
     */
    public static boolean isNotEmpty(final Object[] array) {
        return length(array) > 0;
    }

    /**
     * Checks if the given array is not empty.
     *
     * @param array
     *          array to check
     * @return <code>true</code> if the given reference is not <code>null</code> and array is not empty
     */
    public static boolean isNotEmpty(final JSONArray array) {
        return length(array) > 0;
    }

    /**
     * Checks if the given collection is not empty.
     *
     * @param c
     *          collection to check
     * @return <code>true</code> if the given reference is not <code>null</code> and collection is not empty
     */
    public static boolean isNotEmpty(final Collection<?> c) {
        return c != null && !c.isEmpty();
    }

    /**
     * Checks if the given map is not empty.
     *
     * @param map
     *          map to check
     * @return <code>true</code> if the given reference is not <code>null</code> and map is not empty
     */
    public static boolean isNotEmpty(final Map<?, ?> map) {
        return map != null && !map.isEmpty();
    }

    /**
     * Safely calculates a string length.
     *
     * @param s
     *          string
     * @return real string length or <code>0</code> if reference is <code>null</code>
     */
    public static int length(final String s) {
        return s != null ? s.length() : 0;
    }

    /**
     * Safely calculates an array length.
     *
     * @param arr
     *          array
     * @return real array length or <code>0</code> if reference is <code>null</code>
     */
    public static int length(final Object[] arr) {
        return arr != null ? arr.length : 0;
    }

    /**
     * Safely calculates an array length.
     *
     * @param arr
     *          array
     * @return real array length or <code>0</code> if reference is <code>null</code>
     */
    public static int length(final JSONArray arr) {
        return arr != null ? arr.length() : 0;
    }

    /**
     * Safely calculates an array length.
     *
     * @param arr
     *          array
     * @return real array length or <code>0</code> if reference is <code>null</code>
     */
    public static int length(final boolean[] arr) {
        return arr != null ? arr.length : 0;
    }

    /**
     * Safely calculates a collection length.
     *
     * @param c
     *          collection to check
     * @return real collection length or <code>0</code> if reference is <code>null</code>
     */
    public static int length(final Collection<?> c) {
        return c != null ? c.size() : 0;
    }

    /**
     * Safely calculates a map length.
     *
     * @param map
     *          map to check
     * @return real map length or <code>0</code> if reference is <code>null</code>
     */
    public static int length(final Map<?, ?> map) {
        return map != null ? map.size() : 0;
    }

    /**
     * Safely calculates an array length.
     *
     * @param arr
     *          array
     * @return real array length or <code>0</code> if reference is <code>null</code>
     */
    public static int length(final byte[] arr) {
        return arr != null ? arr.length : 0;
    }

    /**
     * Safely calculates an array length.
     *
     * @param arr
     *          array
     * @return real array length or <code>0</code> if reference is <code>null</code>
     */
    public static int length(final short[] arr) {
        return arr != null ? arr.length : 0;
    }

    /**
     * Safely calculates an array length.
     *
     * @param arr
     *          array
     * @return real array length or <code>0</code> if reference is <code>null</code>
     */
    public static int length(final int[] arr) {
        return arr != null ? arr.length : 0;
    }

    /**
     * Safely calculates an array length.
     *
     * @param arr
     *          array
     * @return real array length or <code>0</code> if reference is <code>null</code>
     */
    public static int length(final long[] arr) {
        return arr != null ? arr.length : 0;
    }

    /**
     * Safely calculates an array length.
     *
     * @param arr
     *          array
     * @return real array length or <code>0</code> if reference is <code>null</code>
     */
    public static int length(final float[] arr) {
        return arr != null ? arr.length : 0;
    }

    /**
     * Safely calculates an array length.
     *
     * @param arr
     *          array
     * @return real array length or <code>0</code> if reference is <code>null</code>
     */
    public static int length(final double[] arr) {
        return arr != null ? arr.length : 0;
    }

    /**
     * Checks if the given string is empty.
     *
     * @param s
     *          string
     * @return <code>true</code> if the given reference is <code>null</code> or string is empty
     */
    public static boolean isEmpty(final String s) {
        return length(s) == 0;
    }

    /**
     * Checks if the given array is empty.
     *
     * @param array
     *          array to check
     * @return <code>true</code> if the given reference is <code>null</code> or array is empty
     */
    public static boolean isEmpty(final Object[] array) {
        return length(array) == 0;
    }

    /**
     * Checks if the given array is empty.
     *
     * @param array
     *          array to check
     * @return <code>true</code> if the given reference is <code>null</code> or array is empty
     */
    public static boolean isEmpty(final JSONArray array) {
        return length(array) == 0;
    }

    /**
     * Checks if the given array is empty.
     *
     * @param array
     *          array to check
     * @return <code>true</code> if the given reference is <code>null</code> or array is empty
     */
    public static boolean isEmpty(final boolean[] array) {
        return length(array) == 0;
    }

    /**
     * Checks if the given array is empty.
     *
     * @param array
     *          array to check
     * @return <code>true</code> if the given reference is <code>null</code> or array is empty
     */
    public static boolean isEmpty(final byte[] array) {
        return length(array) == 0;
    }

    /**
     * Checks if the given array is empty.
     *
     * @param array
     *          array to check
     * @return <code>true</code> if the given reference is <code>null</code> or array is empty
     */
    public static boolean isEmpty(final short[] array) {
        return length(array) == 0;
    }

    /**
     * Checks if the given array is empty.
     *
     * @param array
     *          array to check
     * @return <code>true</code> if the given reference is <code>null</code> or array is empty
     */
    public static boolean isEmpty(final int[] array) {
        return length(array) == 0;
    }

    /**
     * Checks if the given array is empty.
     *
     * @param array
     *          array to check
     * @return <code>true</code> if the given reference is <code>null</code> or array is empty
     */
    public static boolean isEmpty(final long[] array) {
        return length(array) == 0;
    }

    /**
     * Checks if the given array is empty.
     *
     * @param array
     *          array to check
     * @return <code>true</code> if the given reference is <code>null</code> or array is empty
     */
    public static boolean isEmpty(final float[] array) {
        return length(array) == 0;
    }

    /**
     * Checks if the given array is empty.
     *
     * @param array
     *          array to check
     * @return <code>true</code> if the given reference is <code>null</code> or array is empty
     */
    public static boolean isEmpty(final double[] array) {
        return length(array) == 0;
    }

    /**
     * Checks if the given collection is empty.
     *
     * @param c
     *          collection to check
     * @return <code>true</code> if the given reference is <code>null</code> or collection is empty
     */
    public static boolean isEmpty(final Collection<?> c) {
        return c == null || c.isEmpty();
    }

    /**
     * Checks if the given map is empty.
     *
     * @param map
     *          map to check
     * @return <code>true</code> if the given reference is <code>null</code> or map is empty
     */
    public static boolean isEmpty(final Map<?, ?> map) {
        return map == null || map.isEmpty();
    }
}