/*
* JBoss, Home of Professional Open Source
* Copyright 2011, Red Hat, Inc. and/or its affiliates, and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* 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 org.hibernate.validator.cfg.context.impl;

import java.lang.annotation.Annotation;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.util.Map;

import org.hibernate.validator.cfg.ConstraintDef;
import org.hibernate.validator.metadata.location.BeanConstraintLocation;
import org.hibernate.validator.metadata.location.ConstraintLocation;
import org.hibernate.validator.metadata.location.MethodConstraintLocation;

/**
 * Represents a programmatically configured constraint and meta-data
 * related to its location (bean type etc.).
 *
 * @author Gunnar Morling
 */
public class ConfiguredConstraint<A extends Annotation, L extends ConstraintLocation> {

	private final ConstraintDefAccessor<A> constraint;
	private final L location;

	private ConfiguredConstraint(ConstraintDef<?, A> constraint, L location) {

		this.constraint = new ConstraintDefAccessor<A>( constraint );
		this.location = location;
	}

	static <A extends Annotation> ConfiguredConstraint<A, BeanConstraintLocation> forType(ConstraintDef<?, A> constraint, Class<?> beanType) {
		return new ConfiguredConstraint<A, BeanConstraintLocation>(
				constraint, new BeanConstraintLocation( beanType )
		);
	}

	public static <A extends Annotation> ConfiguredConstraint<A, BeanConstraintLocation> forProperty(ConstraintDef<?, A> constraint, Class<?> beanType, Member member) {
		return new ConfiguredConstraint<A, BeanConstraintLocation>(
				constraint, new BeanConstraintLocation( beanType, member )
		);
	}

	public static <A extends Annotation> ConfiguredConstraint<A, MethodConstraintLocation> forParameter(ConstraintDef<?, A> constraint, Method method, int parameterIndex) {
		return new ConfiguredConstraint<A, MethodConstraintLocation>(
				constraint, new MethodConstraintLocation( method, parameterIndex )
		);
	}

	public static <A extends Annotation> ConfiguredConstraint<A, MethodConstraintLocation> forReturnValue(ConstraintDef<?, A> constraint, Method method) {
		return new ConfiguredConstraint<A, MethodConstraintLocation>(
				constraint, new MethodConstraintLocation( method )
		);
	}

	public ConstraintDef<?, A> getConstraint() {
		return constraint;
	}

	public L getLocation() {
		return location;
	}

	public Class<A> getConstraintType() {
		return constraint.getConstraintType();
	}

	public Map<String, Object> getParameters() {
		return constraint.getParameters();
	}

	/**
	 * Provides access to the members of a {@link ConstraintDef}.
	 */
	private static class ConstraintDefAccessor<A extends Annotation>
			extends ConstraintDef<ConstraintDefAccessor<A>, A> {

		private ConstraintDefAccessor(ConstraintDef<?, A> original) {
			super( original );
		}

		private Class<A> getConstraintType() {
			return constraintType;
		}

		private Map<String, Object> getParameters() {
			return parameters;
		}
	}

}
