com.djd.fun.util.MoreStrings.java Source code

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Here is the source code for com.djd.fun.util.MoreStrings.java

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//  Copyright (c) 2016 JGD Licensed under the MIT license
package com.djd.fun.util;

import com.google.common.base.Strings;
import com.sun.istack.internal.Nullable;

/**
 * Collection of static methods for string manipulations
 *
 * @author JGD
 * @since 8/20/16
 */
public class MoreStrings {

    /**
     * returns firstLetter character of the given string.
     * e.g.,
     * <pre><code>
     * input="abcd"; output="a";
     * input="a"; output="a";
     * input=""; output=null;
     * input=null; output=null;
     * </code></pre>
     *
     * @param input string value
     * @return firstLetter character of the given string. {@code null} if input is either null or empty
     */
    public static String firstLetter(@Nullable String input) {
        return (Strings.isNullOrEmpty(input)) ? null : input.substring(0, 1);
    }

    /**
     * returns n-1 length string
     * e.g.,
     * <pre><code>
     * input="abcd"; output="bcd";
     * input=null; output=null;
     * input=""; output=null;
     * input="a"; output=null;
     * </code></pre>
     */
    public static String secondToLast(@Nullable String input) {
        return (input != null && input.length() > 1) ? input.substring(1) : null;
    }
}