/**
 * Copyright (C) 2015 Valkyrie RCP
 *
 * 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.valkyriercp.binding.support;

import org.springframework.beans.BeansException;
import org.springframework.beans.PropertyAccessor;
import org.valkyriercp.binding.MutablePropertyAccessStrategy;
import org.valkyriercp.binding.beans.DefaultMemberPropertyAccessor;
import org.valkyriercp.binding.value.ValueModel;
import org.valkyriercp.binding.value.support.ValueHolder;

/**
 * An implementation of <code>MutablePropertyAccessStrategy</code> that
 * provides type-save access to data specified by a class. The data is stored in
 * a backing map.
 *
 * <p>
 * As this class delegates to a <code>MapPropertyAccessor</code> for property
 * access, there is full support for <b>nested properties</b> and collection
 * types.
 *
 * @author Arne Limburg
 * @see DefaultMemberPropertyAccessor
 */
public class ClassPropertyAccessStrategy extends AbstractPropertyAccessStrategy {

	private final DefaultMemberPropertyAccessor propertyAccessor;

	/**
	 * Creates a new instance of <tt>ClassPropertyAccessStrategy</tt>.
	 * @param targetClass the target class
	 */
	public ClassPropertyAccessStrategy(Class targetClass) {
		super(new ValueHolder());
		propertyAccessor = new DefaultMemberPropertyAccessor(targetClass);
	}

	/**
	 * Creates a new instance of <tt>ClassPropertyAccessStrategy</tt>.
	 * @param target the domain object
	 */
	public ClassPropertyAccessStrategy(Object target) {
		this(new ValueHolder(target));
	}

	/**
	 * Creates a new instance of <tt>ClassPropertyAccessStrategy</tt>.
	 * @param domainObjectHolder the value model containing the domain object
	 */
	public ClassPropertyAccessStrategy(final ValueModel domainObjectHolder) {
		this(domainObjectHolder, false);
	}

	/**
	 * Creates a new instance of <tt>ClassPropertyAccessStrategy</tt>.
	 * @param domainObjectHolder the value model containing the domain object
	 * @param fieldAccessEnabled whether the fields of the objects should be
	 * accessed directly where possible instead of using methods
	 */
	public ClassPropertyAccessStrategy(final ValueModel domainObjectHolder, boolean fieldAccessEnabled) {
		this(domainObjectHolder, fieldAccessEnabled, true);
	}

	/**
	 * Creates a new instance of <tt>ClassPropertyAccessStrategy</tt>.
	 * @param domainObjectHolder the value model containing the domain object
	 * @param fieldAccessEnabled whether the fields of the objects should be
	 * accessed directly where possible instead of using methods
	 * @param strictNullValueHandling whether a
	 * <tt>NullValueInNestedPathException</tt> should be thrown on nested
	 * null-values or <tt>null</tt> should be returned
	 */
	public ClassPropertyAccessStrategy(final ValueModel domainObjectHolder, boolean fieldAccessEnabled,
			boolean strictNullValueHandling) {
		super(domainObjectHolder);
		propertyAccessor = new DefaultMemberPropertyAccessor(domainObjectHolder.getValue().getClass(),
				domainObjectHolder.getValue(), fieldAccessEnabled, strictNullValueHandling);
	}

	/**
	 * Creates a child instance of <tt>ClassPropertyAccessStrategy<tt>
	 * that will delegate to its parent for property access.
	 *
	 * @param parent <tt>ClassPropertyAccessStrategy</tt> which will be used to provide property access
	 * @param basePropertyPath property path that will as a base when accessing
	 *                         the parent <tt>ClassPropertyAccessStrategy</tt>
	 */
	public ClassPropertyAccessStrategy(ClassPropertyAccessStrategy parent, String basePropertyPath) {
		super(parent, basePropertyPath);
		propertyAccessor = parent.propertyAccessor;
	}

	protected PropertyAccessor getPropertyAccessor() {
		return propertyAccessor;
	}

	public MutablePropertyAccessStrategy getPropertyAccessStrategyForPath(String propertyPath) throws BeansException {
		return new ClassPropertyAccessStrategy(this, getFullPropertyPath(propertyPath));
	}

	public MutablePropertyAccessStrategy newPropertyAccessStrategy(ValueModel domainObjectHolder) {
		return new ClassPropertyAccessStrategy(domainObjectHolder);
	}

	protected void domainObjectChanged() {
		propertyAccessor.setTarget(getDomainObject());
	}
}