/*
 * $Id$
 *
 * License Agreement.
 *
 * Rich Faces - Natural Ajax for Java Server Faces (JSF)
 *
 * Copyright (C) 2007 Exadel, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License version 2.1 as published by the Free Software Foundation.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
 */
package org.richfaces.cdk.util;

import java.util.NoSuchElementException;

import com.google.common.base.Joiner;

/**
 * <p class="changed_added_4_0">
 * String manipulation utils.
 * </p>
 *
 * @author asmirnov@exadel.com
 */
public final class Strings {
    public static final Joiner DOT_JOINER = Joiner.on('.');

    private Strings() {

        // this is utility class with static methods only.
    }

    /**
     * <p class="changed_added_4_0">
     * Remove characters from string end
     * </p>
     *
     * @param in input string
     * @param size number of characters to remove.
     * @return
     */
    public static String cut(String in, int size) {
        if (size > 0) {
            return in.substring(0, in.length() - size);
        }

        return in;
    }

    /**
     * <p class="changed_added_4_0">
     * Change case of the first character to lower, as it required by the Java Beans property and setter/getter method name
     * conventions:
     * </p>
     * <p>
     * "PropertyFoo" will be changed to "propertyFoo"
     * </p>
     *
     * @param in
     * @return {@code in} with first character changed to lower case.
     */
    public static String firstToLowerCase(String in) {
        if (!isEmpty(in)) {
            in = in.substring(0, 1).toLowerCase() + in.substring(1);
        }

        return in;
    }

    /**
     * <p class="changed_added_4_0">
     * Change case of the first character to upper, as it required by the Java Beans property and setter/getter method name
     * conventions:
     * </p>
     * <p>
     * "propertyFoo" will be changed to "PropertyFoo"
     * </p>
     *
     * @param in
     * @return {@code in} with first character changed to lower case.
     */
    public static String firstToUpperCase(String in) {
        if (!isEmpty(in)) {
            in = in.substring(0, 1).toUpperCase() + in.substring(1);
        }

        return in;
    }

    /**
     * <p class="changed_added_4_0">
     * Check string for null or empty value
     * </p>
     *
     * @param type
     * @return true if {@code type} is null or zero-length string.
     */
    public static boolean isEmpty(String type) {
        return type == null || type.length() == 0;
    }

    public static String firstNonEmpty(String... strings) {
        for (String s : strings) {
            if (!isEmpty(s)) {
                return s;
            }
        }

        throw new NoSuchElementException();
    }
}
