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/**
 * Copyright (c) 2018 BITPlan GmbH
 *
 * http://www.bitplan.com
 *
 * This file is part of the Opensource project at:
 * https://github.com/BITPlan/com.bitplan.simplegraph
 *
 * 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.bitplan.gremlin;

import java.util.function.BiPredicate;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.tinkerpop.gremlin.process.traversal.P;

// https://groups.google.com/forum/#!topic/gremlin-users/heWLwz9xBQc
// https://stackoverflow.com/a/45652897/1497139
public class RegexPredicate implements BiPredicate {
	Pattern pattern = null;
	private Mode mode;

	enum Mode {
		FIND, MATCH
	}

	public RegexPredicate(String regex, Mode mode) {
		this.mode = mode;
		pattern = Pattern.compile(regex, Pattern.CASE_INSENSITIVE);
	};
	
	public RegexPredicate(String regex) {
		this(regex,Mode.FIND);
	}

	@Override
	public boolean test(final Object first, final Object second) {
		String str = first.toString();
		Matcher matcher = pattern.matcher(str);
		switch (mode) {
		case FIND:
			return matcher.find();
		case MATCH:
			return matcher.matches();
		}
		return false;
	}

	/**
	 * get a Regular expression predicate
	 * 
	 * @param regex
	 * @return - the predicate
	 */
	public static P