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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.openejb.util;

/**
 * @version $Rev$ $Date$
 */
public class Strings {


    public static String lc(final String string) {
        return lowercase(string);
    }

    public static String lowercase(final String string) {
        if (string == null) {
            return null;
        }

        final StringBuilder sb = new StringBuilder(string);
        for (int i = 0; i < sb.length(); i++) {
            sb.setCharAt(i, Character.toLowerCase(sb.charAt(i)));
        }
        return sb.toString();
    }

    public static String uc(final String string) {
        return uppercase(string);
    }

    public static String uppercase(final String string) {
        if (string == null) {
            return null;
        }

        final StringBuilder sb = new StringBuilder(string);
        for (int i = 0; i < sb.length(); i++) {
            sb.setCharAt(i, Character.toUpperCase(sb.charAt(i)));
        }
        return sb.toString();
    }

    public static String ucfirst(final String string) {
        if (string == null) {
            return null;
        }

        final StringBuilder sb = new StringBuilder(string);
        if (sb.length() > 0) {
            sb.setCharAt(0, Character.toUpperCase(sb.charAt(0)));
        }
        return sb.toString();
    }

    public static String lcfirst(final String string) {
        if (string == null) {
            return null;
        }

        final StringBuilder sb = new StringBuilder(string);
        if (sb.length() > 0) {
            sb.setCharAt(0, Character.toLowerCase(sb.charAt(0)));
        }
        return sb.toString();
    }

    public static String camelCase(final String string) {
        return camelCase(string, "-");
    }

    public static String camelCase(final String string, final String delimiter) {
        final StringBuilder sb = new StringBuilder();
        final String[] strings = string.split(delimiter);

        for (final String s : strings) {
            final int l = sb.length();
            sb.append(s);
            sb.setCharAt(l, Character.toUpperCase(sb.charAt(l)));
        }
        return sb.toString();
    }

    public static boolean checkNullBlankString(final String stringToCheck) {
        return stringToCheck == null || "".equals(stringToCheck.trim());
    }

    public static String replaceNullOrBlankStringWithNonBreakingSpace(final String stringToCheckForNull) {
        if (stringToCheckForNull == null || stringToCheckForNull.equals("")) {
            return " ";
        } else {
            return stringToCheckForNull;
        }
    }

    public static String lastPart(final String className, final char sep) {
        final int idx = className.lastIndexOf(sep);
        if (idx >= 0) {
            return className.substring(idx + 1, className.length());
        }
        return className;
    }
}