Overlays part of a String with another String - Android java.lang

Android examples for java.lang:String Algorithm

  1. HOME
  2. Android
  3. java.lang
  4. String Algorithm

Description

Overlays part of a String with another String

Demo Code

/*//from ww  w . j  ava 2s .c om
 * 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.
 */
import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;
import java.text.Normalizer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.regex.Pattern;

public class Main{

    /**
     * <p>Overlays part of a String with another String.</p>
     *
     * <p>A {@code null} string input returns {@code null}.
     * A negative index is treated as zero.
     * An index greater than the string length is treated as the string length.
     * The start index is always the smaller of the two indices.</p>
     *
     * <pre>
     * StringUtils.overlay(null, *, *, *)            = null
     * StringUtils.overlay("", "abc", 0, 0)          = "abc"
     * StringUtils.overlay("abcdef", null, 2, 4)     = "abef"
     * StringUtils.overlay("abcdef", "", 2, 4)       = "abef"
     * StringUtils.overlay("abcdef", "", 4, 2)       = "abef"
     * StringUtils.overlay("abcdef", "zzzz", 2, 4)   = "abzzzzef"
     * StringUtils.overlay("abcdef", "zzzz", 4, 2)   = "abzzzzef"
     * StringUtils.overlay("abcdef", "zzzz", -1, 4)  = "zzzzef"
     * StringUtils.overlay("abcdef", "zzzz", 2, 8)   = "abzzzz"
     * StringUtils.overlay("abcdef", "zzzz", -2, -3) = "zzzzabcdef"
     * StringUtils.overlay("abcdef", "zzzz", 8, 10)  = "abcdefzzzz"
     * </pre>
     *
     * @param str  the String to do overlaying in, may be null
     * @param overlay  the String to overlay, may be null
     * @param start  the position to start overlaying at
     * @param end  the position to stop overlaying before
     * @return overlayed String, {@code null} if null String input
     * @since 2.0
     */
    public static String overlay(final String str, String overlay,
            int start, int end) {
        if (str == null) {
            return null;
        }
        if (overlay == null) {
            overlay = "";
        }
        final int len = str.length();
        if (start < 0) {
            start = 0;
        }
        if (start > len) {
            start = len;
        }
        if (end < 0) {
            end = 0;
        }
        if (end > len) {
            end = len;
        }
        if (start > end) {
            final int temp = start;
            start = end;
            end = temp;
        }
        return new StringBuilder(len + start - end + overlay.length() + 1)
                .append(str.substring(0, start)).append(overlay)
                .append(str.substring(end)).toString();
    }

}

Related Tutorials