Apache Commons Codec Source Code

Apache Commons Codec library provides implementations of common encoders and decoders such as Base64, Hex, Phonetic and URLs.

Apache Commons Codec Source Code files are provided in both binary packge (commons-codec-3.15-bin.zip) and source package (commons-codec-3.15-src.zip). You can download them at Apache Commons Codec Website.

Apache Commons Codec Source Code has no dependencies. You can compile it to generate your own version of Apache Commons Codec JAR file.

The source code of Apache Commons Codec 1.15 is provided below:

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org/apache/commons/codec/binary/CharSequenceUtils.java

/*
 * 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.commons.codec.binary;

/**
 * <p>
 * Operations on {@link CharSequence} that are {@code null} safe.
 * </p>
 * <p>
 * Copied from Apache Commons Lang r1586295 on April 10, 2014 (day of 3.3.2 release).
 * </p>
 *
 * @see CharSequence
 * @since 1.10
 */
public class CharSequenceUtils {

    /**
     * Green implementation of regionMatches.
     * 
     * <p>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;
    }
}

org/apache/commons/codec/binary/CharSequenceUtils.java

 

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File name: commons-codec-1.15-sources.jar
File size: 364441 bytes
Release date: 2020-09-01
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