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A collection of classes shared by broadleaf profile, cms, admin, and core.

There is a newer version: 3.1.15-GA

/*
 * Copyright 2008-2012 the original author or authors.
 *
 * 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.broadleafcommerce.common.util;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.zip.Adler32;
import java.util.zip.CheckedInputStream;

public class StringUtil {

    public static long getChecksum(String test) {
        try {
            byte buffer[] = test.getBytes();
            ByteArrayInputStream bais = new ByteArrayInputStream(buffer);
            CheckedInputStream cis = new CheckedInputStream(bais, new Adler32());
            byte readBuffer[] = new byte[buffer.length];
            cis.read(readBuffer);
            return cis.getChecksum().getValue();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static double determineSimilarity(String test1, String test2) {
        String first = new String(test1);
        first = first.replaceAll("[ \\t\\n\\r\\f\\v\\/'-]", "");
        Long originalChecksum = StringUtil.getChecksum(first);
        String second = new String(test2);
        second = second.replaceAll("[ \\t\\n\\r\\f\\v\\/'-]", "");
        Long myChecksum = StringUtil.getChecksum(second);
        StatCalc calc = new StatCalc();
        calc.enter(originalChecksum);
        calc.enter(myChecksum);
        return calc.getStandardDeviation();
    }
    
    /**
     * Protect against HTTP Response Splitting
     * @return
     */
    public static String cleanseUrlString(String input){
        return removeSpecialCharacters(decodeUrl(input));
    }

    public static String decodeUrl(String encodedUrl) {
        try {
            return encodedUrl == null ? null : URLDecoder.decode(encodedUrl, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            // this should not happen
            e.printStackTrace();
            return encodedUrl;
        }
    }

    public static String removeSpecialCharacters(String input) {
        if (input != null) {
            input = input.replaceAll("[ \\r\\n]", "");
        }
        return input;
    }
}