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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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * .
 *
 */

package org.apache.http.util;

/**
 * @since 4.3
 */
public final class TextUtils {

    /**
     * Returns true if the parameter is null or of zero length
     */
    public static boolean isEmpty(final CharSequence s) {
        if (s == null) {
            return true;
        }
        return s.length() == 0;
    }

    /**
     * Returns true if the parameter is null or contains only whitespace
     */
    public static boolean isBlank(final CharSequence s) {
        if (s == null) {
            return true;
        }
        for (int i = 0; i < s.length(); i++) {
            if (!Character.isWhitespace(s.charAt(i))) {
                return false;
            }
        }
        return true;
    }

    /**
     * @since 4.4
     */
    public static boolean containsBlanks(final CharSequence s) {
        if (s == null) {
            return false;
        }
        for (int i = 0; i < s.length(); i++) {
            if (Character.isWhitespace(s.charAt(i))) {
                return true;
            }
        }
        return false;
    }

}