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/**
 * vertigo - simple java starter
 *
 * Copyright (C) 2013-2016, KleeGroup, [email protected] (http://www.kleegroup.com)
 * KleeGroup, Centre d'affaire la Boursidiere - BP 159 - 92357 Le Plessis Robinson Cedex - France
 *
 * 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.vertigo.commons.parser;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;

import io.vertigo.lang.Assertion;

/**
 * The first rule that matches is taken.
 * If no rule is found then an notFoundException is thrown. 
 * 
 * @author pchretien
 */
public final class FirstOfRule implements Rule {
	private final List> rules;
	private final String expression;

	/**
	 * Constructor.
	 * @param rules the list of rules to test
	 */
	public FirstOfRule(final Rule... rules) {
		this(Arrays.asList(rules));
	}

	/**
	 * Constructor.
	 * @param rules the list of rules to test
	 */
	public FirstOfRule(final List> rules) {
		Assertion.checkNotNull(rules);
		//-----
		this.rules = Collections.unmodifiableList(rules);
		//---
		final StringBuilder buffer = new StringBuilder();
		for (final Rule rule : rules) {
			if (buffer.length() > 0) {
				buffer.append(" | ");
			}
			buffer.append(rule.getExpression());
		}
		expression = buffer.toString();
	}

	/** {@inheritDoc} */
	@Override
	public String getExpression() {
		return expression;
	}

	/**
	 * @return the list of rules to test
	 */
	List> getRules() {
		return rules;
	}

	/** {@inheritDoc} */
	@Override
	public Parser createParser() {
		return new FirstOfRuleParser(this);
	}
}