/*******************************************************************************
 * Copyright (c) 2001, 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 * IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jst.j2ee.ejb.internal.impl;

import java.util.List;

import org.eclipse.emf.ecore.EPackage;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.jem.java.JavaHelpers;
import org.eclipse.jst.j2ee.ejb.CMPAttribute;
import org.eclipse.jst.j2ee.ejb.CommonRelationshipRole;
import org.eclipse.jst.j2ee.ejb.ContainerManagedEntity;
import org.eclipse.jst.j2ee.ejb.EjbPackage;
import org.eclipse.jst.j2ee.ejb.IRoleShapeStrategy;

/**
 * Insert the type's description here.
 * Creation date: (11/6/2000 11:41:33 AM)
 * @author: Administrator
 */
public class EJB20FlattenedRoleShapeStrategy extends RoleShapeStrategy {
	/**
	 * FlattenedRoleShapeStrategy constructor comment.
	 */
	public EJB20FlattenedRoleShapeStrategy(CommonRelationshipRole aRole) {
		super(aRole);
	}
	protected boolean canContinue() {
		return !busy && role.getName() != null && (role.isForward() ||
			(role.isMany() && (role.getOppositeAsCommonRole() == null ||
			role.getOppositeAsCommonRole().isMany())));
	}
	
	public boolean usesAttributeNamed(String attributeName) {
		if (attributeName != null) {
			int index = attributeName.indexOf(IRoleShapeStrategy.ATTRIBUTE_NAME_JOINER);
			String name = attributeName.substring(0, index);
			return getRole().getName().equals(name);
		}
		return false;
	}

	/**
	 * @see RoleShapeStrategy#reconcileAttributes(CommonRelationshipRole, String, List, List)
	 */
	protected void reconcileAttributes(CommonRelationshipRole aRole, String attributeName, List aList, List computedNames) {
		
		Resource res = aRole.eResource();
		boolean dirtyFlag = res != null ? res.isModified() : false;
		try {		
			if (aRole.getOppositeAsCommonRole() != null) {
				ContainerManagedEntity entity = aRole.getOppositeAsCommonRole().getSourceEntity();
		//	ContainerManagedEntityExtension roleType = (ContainerManagedEntityExtension)getTypeExtension(aRole);
			if (entity != null)
				collectAttributes(entity, attributeName, aList, computedNames);
		}
		} finally {
			if (res != null)
				res.setModified(dirtyFlag);
		}
	}

	/**
	 * @see com.ibm.ejs.models.base.extensions.ejbext.impl.FlattenedRoleShapeStrategy#setDerivedAttributeType(CMPAttribute, JavaHelpers)
	 */
	protected void setDerivedAttributeType(CMPAttribute attribute, CMPAttribute targetAttribute, boolean isNew) {
		if (targetAttribute == null) return;
		JavaHelpers fieldType = targetAttribute.getType();
		if (fieldType != null) {
			int singleRoleNameSize = getRole().getName().length() + targetAttribute.getName().length() + 1; //one for the underscore
			if (!(attribute.getName().length() > singleRoleNameSize)) //don't set the originating type since we are derived from another derived attribute
				attribute.setOriginatingType(fieldType);
			attribute.setEType(fieldType.getWrapper());
		}
		if (isNew && !getRole().isKey())
			attribute.setDerived(true);
	}
	/**
	 * getFields method comment.
	 */
	protected void collectAttributes(ContainerManagedEntity type, String attributeName, List aList, List computedNames) {
		collectKeyModelledAttributes(type, attributeName, aList, computedNames);
		collectKeyRoleAttributes(type, attributeName, aList, computedNames);
	}
	/**
	 * 
	 */
	protected void collectAttributes(CMPAttribute type, String attributeName, List aList, List computedNames) {
		boolean isNewAttribute = false;
		attributeName = appendName(attributeName, type.getName());
		computedNames.add(attributeName);
		CMPAttribute attribute = getCMPEntity().getPersistentAttribute(attributeName);
		if (attribute == null) {
			attribute = createPersistentAttribute(attributeName);
			isNewAttribute = true;
		}
		//This is necessary for code generation
		ContainerManagedEntity entity = (ContainerManagedEntity) type.eContainer();
		if (entity != null)
			setDerivedAttributeType(attribute, type, isNewAttribute);
		if (isNewAttribute) {
			if (getRole().isKey())
				getCMPEntity().getKeyAttributes().add(attribute);
			aList.add(attribute);
			getCMPEntity().getPersistentAttributes().add(attribute);
		} else {
			if (!aList.contains(attribute))
				aList.add(attribute);
		}
	}
	protected CMPAttribute createPersistentAttribute(String aName) {
		CMPAttribute attribute = ((EjbPackage)EPackage.Registry.INSTANCE.getEPackage(EjbPackage.eNS_URI)).getEjbFactory().createCMPAttribute();
		attribute.setName(aName);
		attribute.setDescription("Generated to support relationships.  Do NOT delete.");
		return attribute;
	}
	/**
	 * getFields method comment.
	 */
	protected void collectKeyModelledAttributes(ContainerManagedEntity entity, String attributeName, List aList, List computedNames) {
		java.util.Iterator it = entity.getFilteredFeatures(ModelledKeyAttributeFilter.singleton()).iterator();
		CMPAttribute attribute;
		while (it.hasNext()) {
			attribute = (CMPAttribute) it.next();
			collectAttributes(attribute, attributeName, aList, computedNames);
		}
	}
	/**
	 * getFields method comment.
	 */
	protected void collectKeyRoleAttributes(ContainerManagedEntity entity, String attributeName, List aList, List computedNames) {
		if(visitedKeyTypes.contains(entity)){
			throw new RuntimeException("Key role cycle detected");
		}
		visitedKeyTypes.add(entity);
		java.util.Iterator it = entity.getFilteredFeatures(KeyRelationshipRoleFilter.singleton()).iterator();
		CommonRelationshipRole aRole;
		while (it.hasNext()) {
			aRole = (CommonRelationshipRole) it.next();
			String attName = appendName(attributeName, aRole.getName());
			reconcileAttributes(aRole, attName, aList, computedNames);
		}
	}
	protected ContainerManagedEntity getCMPEntity() {
		return getRole().getSourceEntity();
	}


}