com.ibm.watson.catalyst.qa.safe.strings.QaSafeStrings.java Source code

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/*******************************************************************************
 * Copyright 2015 IBM Corporation
 *
 * 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 com.ibm.watson.catalyst.qa.safe.strings;

import java.util.regex.Pattern;

import com.ibm.icu.text.Transliterator;

import org.apache.commons.lang3.StringEscapeUtils;

public class QaSafeStrings {

    /**
     * An IBM open source object for mapping UTF-8 to ASCII since Watson can only handle ASCII characters.
     */
    private static final Transliterator transliterator = Transliterator.getInstance("Any-Latin; Latin-ASCII");

    /**
     * Matches hyphens with spaces around them since sometimes spaces around hyphens are removed during ingestion.
     */
    //  private static final Pattern HYPHEN = Pattern.compile(" - ");

    /**
     * Find occurrences of multiple lines and replace them
     */
    private static final Pattern WHITESPACE = Pattern.compile("(\\s(\\s)?)\\1+");

    /**
     * Decodes HTML encoded text
     * @param aString the string to replace decimal code points in
     * @return the string with the decimal code points replaced
     */
    public static String unescapeHtml4(final String aString) {
        return StringEscapeUtils.unescapeHtml4(aString);
    }

    /**
     * Transforms UTF-8 into Watson-safe ASCII.
     * @param aString the string to transform
     */
    public static String transform(final String aString) {
        String result = aString;
        result = WHITESPACE.matcher(aString).replaceAll("$1");
        result = unescapeHtml4(result);
        result = transliterator.transliterate(result);
        //    result = HYPHEN.matcher(result).replaceAll("-");
        result = result.trim();
        return result;
    }

    /**
     * Example of using the watsonTransform method
     * @param args
     */
    public static void main(String[] args) {
        System.out.println(transform(""));
        System.out.println(transform("I cn  onvë®t - things & stuff: . ®"));
    }

}