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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
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 */
package org.apache.commons.codec.binary;

/**
 * 

* Operations on {@link CharSequence} that are {@code null} safe. *

*

* Copied from Apache Commons Lang r1586295 on April 10, 2014 (day of 3.3.2 release). *

* * @see CharSequence * @since 1.10 */ public class CharSequenceUtils { /** * Green implementation of regionMatches. * *

* Note: This function differs from the current implementation in Apache Commons Lang * where the input indices are not valid. It is only used within this package. *

* * @param cs * the {@code CharSequence} to be processed * @param ignoreCase * whether or not to be case-insensitive * @param thisStart * the index to start on the {@code cs} CharSequence * @param substring * the {@code CharSequence} to be looked for * @param start * the index to start on the {@code substring} CharSequence * @param length * character length of the region * @return whether the region matched */ static boolean regionMatches(final CharSequence cs, final boolean ignoreCase, final int thisStart, final CharSequence substring, final int start, final int length) { if (cs instanceof String && substring instanceof String) { return ((String) cs).regionMatches(ignoreCase, thisStart, (String) substring, start, length); } int index1 = thisStart; int index2 = start; int tmpLen = length; while (tmpLen-- > 0) { final char c1 = cs.charAt(index1++); final char c2 = substring.charAt(index2++); if (c1 == c2) { continue; } if (!ignoreCase) { return false; } // The same check as in String.regionMatches(): if (Character.toUpperCase(c1) != Character.toUpperCase(c2) && Character.toLowerCase(c1) != Character.toLowerCase(c2)) { return false; } } return true; } }




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