/*

 * Copyright (c) 2009, 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * This file is available under and governed by the GNU General Public

 * License version 2 only, as published by the Free Software Foundation.

 * However, the following notice accompanied the original version of this

 * file:

 *

 * The MIT License

 *

 * Copyright (c) 2004-2014 Paul R. Holser, Jr.

 *

 * Permission is hereby granted, free of charge, to any person obtaining

 * a copy of this software and associated documentation files (the

 * "Software"), to deal in the Software without restriction, including

 * without limitation the rights to use, copy, modify, merge, publish,

 * distribute, sublicense, and/or sell copies of the Software, and to

 * permit persons to whom the Software is furnished to do so, subject to

 * the following conditions:

 *

 * The above copyright notice and this permission notice shall be

 * included in all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE

 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION

 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION

 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

 */

package jdk.internal.joptsimple.internal;

import java.util.Iterator;

import java.util.List;

import static java.lang.System.*;

import static java.util.Arrays.*;

/**

 * @author <a href="mailto:pholser@alumni.rice.edu">Paul Holser</a>

 */

public final class Strings {

    public static final String EMPTY = "";

    public static final String SINGLE_QUOTE = "'";

    public static final String LINE_SEPARATOR = getProperty( "line.separator" );

    private Strings() {

        throw new UnsupportedOperationException();

    }

    /**

     * Gives a string consisting of the given character repeated the given number of times.

     *

     * @param ch the character to repeat

     * @param count how many times to repeat the character

     * @return the resultant string

     */

    public static String repeat( char ch, int count ) {

        StringBuilder buffer = new StringBuilder();

        for ( int i = 0; i < count; ++i )

            buffer.append( ch );

        return buffer.toString();

    }

    /**

     * Tells whether the given string is either {@code} or consists solely of whitespace characters.

     *

     * @param target string to check

     * @return {@code true} if the target string is null or empty

     */

    public static boolean isNullOrEmpty( String target ) {

        return target == null || EMPTY.equals( target );

    }

    /**

     * Gives a string consisting of a given string prepended and appended with surrounding characters.

     *

     * @param target a string

     * @param begin character to prepend

     * @param end character to append

     * @return the surrounded string

     */

    public static String surround( String target, char begin, char end ) {

        return begin + target + end;

    }

    /**

     * Gives a string consisting of the elements of a given array of strings, each separated by a given separator

     * string.

     *

     * @param pieces the strings to join

     * @param separator the separator

     * @return the joined string

     */

    public static String join( String[] pieces, String separator ) {

        return join( asList( pieces ), separator );

    }

    /**

     * Gives a string consisting of the string representations of the elements of a given array of objects,

     * each separated by a given separator string.

     *

     * @param pieces the elements whose string representations are to be joined

     * @param separator the separator

     * @return the joined string

     */

    public static String join( List<String> pieces, String separator ) {

        StringBuilder buffer = new StringBuilder();

        for ( Iterator<String> iter = pieces.iterator(); iter.hasNext(); ) {

            buffer.append( iter.next() );

            if ( iter.hasNext() )

                buffer.append( separator );

        }

        return buffer.toString();

    }

}