StringUtil.java

/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates
 * and other contributors as indicated by the @author tags.
 *
 * Licensed 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.keycloak.saml.common.util;

import org.keycloak.saml.common.PicketLinkLogger;
import org.keycloak.saml.common.PicketLinkLoggerFactory;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.StringTokenizer;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Utility dealing with Strings
 *
 * @author Anil.Saldhana@redhat.com
 * @since Oct 21, 2009
 */
public class StringUtil {

    private static final PicketLinkLogger logger = PicketLinkLoggerFactory.getLogger();

    /**
     * Check whether the passed string is null or empty
     *
     * @param str
     *
     * @return
     */
    public static boolean isNotNull(String str) {
        return str != null && !"".equals(str.trim());
    }

    /**
     * Check whether the string is null or empty
     *
     * @param str
     *
     * @return
     */
    public static boolean isNullOrEmpty(String str) {
        return str == null || str.isEmpty();
    }

    /**
     * Match two strings else throw a {@link RuntimeException}
     *
     * @param first
     * @param second
     */
    public static void match(String first, String second) {
        if (!first.equals(second))
            throw logger.notEqualError(first, second);
    }
}