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The core ELK Reasoner package
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/*-
 * #%L
 * ELK Reasoner Core
 * $Id:$
 * $HeadURL:$
 * %%
 * Copyright (C) 2011 - 2017 Department of Computer Science, University of Oxford
 * %%
 * 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.
 * #L%
 */
package org.semanticweb.elk.reasoner.config;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Map;

import org.semanticweb.elk.util.collections.CapacityBalancingEvictor;
import org.semanticweb.elk.util.collections.CountingEvictor;
import org.semanticweb.elk.util.collections.Evictor;
import org.semanticweb.elk.util.collections.NQEvictor;
import org.semanticweb.elk.util.collections.RecencyEvictor;

import com.google.common.collect.ImmutableMap;

public class EvictorBuilder {

	public static final Map> EVICTOR_CLASS_SHORTCUT;

	static {
		final ImmutableMap.Builder> builder = ImmutableMap
				.builder();
		put(builder, RecencyEvictor.class);
		put(builder, CapacityBalancingEvictor.class);
		put(builder, CountingEvictor.class);
		put(builder, NQEvictor.class);
		EVICTOR_CLASS_SHORTCUT = builder.build();
	}

	private static void put(
			final ImmutableMap.Builder> builder,
			final Class value) {
		builder.put(value.getSimpleName(), value);
	}

	public static Evictor.Builder valueOf(final String value)
			throws IllegalArgumentException {

		final int indexOfArgs = value.indexOf("(");
		if (indexOfArgs < 0) {
			throw new IllegalArgumentException(
					"Cannot separate type from arguments! value: " + value);
		}
		final String typeName = value.substring(0, indexOfArgs).trim();

		Class clazz = EVICTOR_CLASS_SHORTCUT.get(typeName);
		if (clazz == null) {
			try {
				clazz = Class.forName(typeName);
			} catch (final ClassNotFoundException e) {
				throw new IllegalArgumentException(
						"There is no class for the type! value: " + value, e);
			}
		}

		if (!Evictor.Builder.class.isAssignableFrom(clazz)) {
			// Search for the builder class inside!
			Class builderClass = null;
			for (final Class innerClass : clazz.getClasses()) {
				if (Evictor.Builder.class.isAssignableFrom(innerClass)) {
					if (builderClass != null) {
						throw new IllegalArgumentException(
								"The type contains multiple builder classes! value: "
										+ value);
					}
					builderClass = innerClass;
				}
			}
			if (builderClass == null) {
				throw new IllegalArgumentException(
						"The type does not contains builder class! value: "
								+ value);
			}
			clazz = builderClass;
		}

		final Method method = ReasonerConfiguration.getValueOfMethod(clazz);
		if (method == null) {
			throw new IllegalArgumentException(
					"The builder class does not have public static method valueOf with a String argument! value: "
							+ value);
		}

		final Object result;
		try {
			result = method.invoke(null, value);
		} catch (final IllegalAccessException e) {
			throw new IllegalArgumentException(
					"Exception when calling valueOf of the builder class! value: "
							+ value,
					e);
		} catch (final InvocationTargetException e) {
			final Throwable cause = e.getCause();
			if (cause instanceof IllegalArgumentException) {
				throw (IllegalArgumentException) cause;
			}
			throw new IllegalArgumentException(
					"Exception when calling valueOf of the builder class! value: "
							+ value,
					e);
		}

		if (!(result instanceof Evictor.Builder)) {
			throw new IllegalArgumentException(
					"The result of calling valueOf of the builder class is not a builder! value: "
							+ value);
		}

		return (Evictor.Builder) result;
	}

}