com.lithium.flow.config.parsers.LoaderConfigParser Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of flow Show documentation

There is a newer version: 0.7.48

/*
 * Copyright 2015 Lithium Technologies, Inc.
 *
 * 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.lithium.flow.config.parsers;

import static com.google.common.base.Preconditions.checkNotNull;

import com.lithium.flow.config.ConfigBuilder;
import com.lithium.flow.config.ConfigLoader;
import com.lithium.flow.config.ConfigParser;
import com.lithium.flow.config.loaders.FileConfigLoader;

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

import javax.annotation.Nonnull;

/**
 * @author Matt Ayres
 */
public class LoaderConfigParser implements ConfigParser {
	private static final Pattern pattern = Pattern.compile("!loader[ \t]+(.+?)[ \t]*");
	private final Callback callback;

	public LoaderConfigParser(Callback callback) {
		this.callback = checkNotNull(callback);
	}

	@Override
	public boolean parseLine(@Nonnull String line, @Nonnull ConfigBuilder builder) {
		checkNotNull(line);
		checkNotNull(builder);

		Matcher matcher = pattern.matcher(line);
		if (matcher.matches()) {
			callback.onLoader(new FileConfigLoader(matcher.group(1)));
			return true;
		} else {
			return false;
		}
	}

	public interface Callback {
		void onLoader(ConfigLoader loader);
	}
}