io.devbench.uibuilder.data.collectionds.utils.LikeExpressionToRegexp Maven / Gradle / Ivy

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/*
 *
 * Copyright © 2018 Webvalto Ltd.
 *
 * 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 io.devbench.uibuilder.data.collectionds.utils;

import java.util.regex.Pattern;

public class LikeExpressionToRegexp {


    private static final String REGEXP_SPECIAL = "[](){}.*+?$^|#\\";
    private static final String REGEXP_MULTIPLE = ".*?";
    private static final String REGEXP_SINGLE = ".";
    private static final String REGEXP_ESCAPE = "\\";
    private static final String LIKE_MULTIPLE = "%";
    private static final String LIKE_SINGLE = "_";

    public static boolean like(String str, String expr) {
        if (str == null || expr == null) {
            return false;
        }
        return Pattern.compile(translateString(expr), Pattern.DOTALL).matcher(str).matches();
    }

    public static boolean ilike(String str, String expr) {
        if (str == null || expr == null) {
            return false;
        }
        return Pattern.compile(translateString(expr), Pattern.CASE_INSENSITIVE | Pattern.DOTALL).matcher(str).matches();
    }

    public static String translateString(String expression) {
        StringBuilder sb = new StringBuilder(expression.length() * 2);
        for (char element : expression.toCharArray()) {
            translateChar(sb, element);
        }
        return sb.toString();
    }

    private static void translateChar(StringBuilder sb, char element) {
        if (charIn(element, REGEXP_SPECIAL)) {
            sb.append(REGEXP_ESCAPE);
            sb.append(element);
        } else if (charIn(element, LIKE_SINGLE)) {
            sb.append(REGEXP_SINGLE);

        } else if (charIn(element, LIKE_MULTIPLE)) {
            sb.append(REGEXP_MULTIPLE);
        } else {
            sb.append(element);
        }
    }

    public static boolean charIn(char c, String s) {
        return s.indexOf(c) != -1;
    }
}