AssociationFromLinkExpressionEvaluatorFactory.java example

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/*
 * Copyright (c) 2014-2016 Evolveum
 *
 * 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.evolveum.midpoint.model.common.expression.evaluator;

import java.util.Collection;

import javax.xml.bind.JAXBElement;
import javax.xml.namespace.QName;

import com.evolveum.midpoint.model.api.ModelService;
import com.evolveum.midpoint.model.common.expression.ExpressionEvaluator;
import com.evolveum.midpoint.model.common.expression.ExpressionEvaluatorFactory;
import com.evolveum.midpoint.prism.ItemDefinition;
import com.evolveum.midpoint.prism.PrismContainerDefinition;
import com.evolveum.midpoint.prism.PrismContext;
import com.evolveum.midpoint.prism.PrismValue;
import com.evolveum.midpoint.prism.crypto.Protector;
import com.evolveum.midpoint.schema.result.OperationResult;
import com.evolveum.midpoint.schema.util.ObjectResolver;
import com.evolveum.midpoint.task.api.Task;
import com.evolveum.midpoint.util.exception.SchemaException;
import com.evolveum.midpoint.xml.ns._public.common.common_3.AssociationFromLinkExpressionEvaluatorType;
import com.evolveum.midpoint.xml.ns._public.common.common_3.ObjectFactory;
import com.evolveum.midpoint.xml.ns._public.common.common_3.ShadowAssociationType;
import org.apache.commons.lang.Validate;

/**
 * @author semancik
 *
 */
public class AssociationFromLinkExpressionEvaluatorFactory implements ExpressionEvaluatorFactory {
	
	private PrismContext prismContext;
	private Protector protector;
	private ObjectResolver objectResolver;
	private ModelService modelService;

	public AssociationFromLinkExpressionEvaluatorFactory(PrismContext prismContext, Protector protector, ObjectResolver objectResolver, ModelService modelService) {
		super();
		this.prismContext = prismContext;
		this.protector = protector;
		this.objectResolver = objectResolver;
		this.modelService = modelService;
	}

	/* (non-Javadoc)
	 * @see com.evolveum.midpoint.common.expression.ExpressionEvaluatorFactory#getElementName()
	 */
	@Override
	public QName getElementName() {
		return new ObjectFactory().createAssociationFromLink(new AssociationFromLinkExpressionEvaluatorType()).getName();
	}

	/* (non-Javadoc)
	 * @see com.evolveum.midpoint.common.expression.ExpressionEvaluatorFactory#createEvaluator(javax.xml.bind.JAXBElement)
	 */
	@Override
	public <V extends PrismValue,D extends ItemDefinition> ExpressionEvaluator<V,D> createEvaluator(Collection<JAXBElement<?>> evaluatorElements,
																									D outputDefinition, String contextDescription, Task task, OperationResult result) throws SchemaException {

        Validate.notNull(outputDefinition, "output definition must be specified for associationFromLink expression evaluator");
		
		JAXBElement<?> evaluatorElement = null;
		if (evaluatorElements != null) {
			if (evaluatorElements.size() > 1) {
				throw new SchemaException("More than one evaluator specified in "+contextDescription);
			}
			evaluatorElement = evaluatorElements.iterator().next();
		}
		
		Object evaluatorTypeObject = null;
        if (evaluatorElement != null) {
        	evaluatorTypeObject = evaluatorElement.getValue();
        }
        if (evaluatorTypeObject != null && !(evaluatorTypeObject instanceof AssociationFromLinkExpressionEvaluatorType)) {
            throw new SchemaException("Association expression evaluator cannot handle elements of type " + evaluatorTypeObject.getClass().getName()+" in "+contextDescription);
        }
        AssociationFromLinkExpressionEvaluator evaluator = new AssociationFromLinkExpressionEvaluator(
        		(AssociationFromLinkExpressionEvaluatorType)evaluatorTypeObject, 
        		(PrismContainerDefinition<ShadowAssociationType>) outputDefinition, objectResolver, prismContext);
        return (ExpressionEvaluator<V,D>) evaluator;
	}

}