StringUtils.java Source code

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Here is the source code for StringUtils.java

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/*
 * @(#)$Id: StringUtils.java 3619 2008-03-26 07:23:03Z yui $
 *
 * Copyright 2006-2008 Makoto YUI
 *
 * 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.
 * 
 * Contributors:
 *     Makoto YUI - initial implementation
 */
//package xbird.util.string;

/**
 * 
 * <DIV lang="en"></DIV>
 * <DIV lang="ja"></DIV>
 * 
 * @author Makoto YUI (yuin405+xbird@gmail.com)
 */
public final class StringUtils {

    public static String strip(String src, String stripChars) {
        return (String) strip((CharSequence) src, stripChars);
    }

    /**
     * @param stripChars if null, remove leading unicode whitespaces.
     */
    public static CharSequence strip(CharSequence src, String stripChars) {
        if (src == null || src.length() == 0) {
            return src;
        }
        final CharSequence striped = stripStart(src, stripChars);
        return stripEnd(striped, stripChars);
    }

    /**
     * @param stripChars if null, remove leading unicode whitespaces.
     */
    public static CharSequence stripStart(CharSequence src, String stripChars) {
        int srclen;
        if (src == null || (srclen = src.length()) == 0) {
            return src;
        }
        int start = 0;
        if (stripChars == null) {
            while ((start != srclen) && Character.isWhitespace(src.charAt(start))) {
                start++;
            }
        } else if (stripChars.length() == 0) {
            return src;
        } else {
            while ((start != srclen) && (stripChars.indexOf(src.charAt(start)) != -1)) {
                start++;
            }
        }
        return src.subSequence(start, srclen);
    }

    /**
     * @param stripChars if null, remove leading unicode whitespaces.
     */
    public static CharSequence stripEnd(CharSequence src, String stripChars) {
        int end;
        if (src == null || (end = src.length()) == 0) {
            return src;
        }
        if (stripChars == null) {
            while ((end != 0) && Character.isWhitespace(src.charAt(end - 1))) {
                end--;
            }
        } else if (stripChars.length() == 0) {
            return src;
        } else {
            while ((end != 0) && (stripChars.indexOf(src.charAt(end - 1)) != -1)) {
                end--;
            }
        }
        return src.subSequence(0, end);
    }

}