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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or .
 */
package org.hibernate.query.criteria.internal.path;

import java.io.Serializable;
import java.util.List;
import javax.persistence.criteria.Expression;
import javax.persistence.criteria.JoinType;
import javax.persistence.criteria.Predicate;
import javax.persistence.metamodel.ListAttribute;
import javax.persistence.metamodel.ManagedType;

import org.hibernate.query.criteria.internal.CriteriaBuilderImpl;
import org.hibernate.query.criteria.internal.CriteriaSubqueryImpl;
import org.hibernate.query.criteria.internal.FromImplementor;
import org.hibernate.query.criteria.internal.ListJoinImplementor;
import org.hibernate.query.criteria.internal.PathImplementor;
import org.hibernate.query.criteria.internal.PathSource;
import org.hibernate.query.criteria.internal.compile.RenderingContext;
import org.hibernate.query.criteria.internal.expression.ListIndexExpression;

/**
 * Models a join based on a list-style plural association attribute.
 *
 * @author Steve Ebersole
 */
public class ListAttributeJoin
		extends PluralAttributeJoinSupport,E>
		implements ListJoinImplementor, Serializable {

	public ListAttributeJoin(
			CriteriaBuilderImpl criteriaBuilder,
			Class javaType,
			PathSource pathSource,
			ListAttribute joinAttribute,
			JoinType joinType) {
		super( criteriaBuilder, javaType, pathSource, joinAttribute, joinType );
	}

	@Override
	public Expression index() {
		return new ListIndexExpression( criteriaBuilder(), this, getAttribute() );
	}

	@Override
	public ListAttribute getAttribute() {
		return (ListAttribute) super.getAttribute();
	}

	@Override
	public ListAttribute getModel() {
		return getAttribute();
	}

	@Override
	public final ListAttributeJoin correlateTo(CriteriaSubqueryImpl subquery) {
		return (ListAttributeJoin) super.correlateTo( subquery );
	}

	@Override
	protected FromImplementor createCorrelationDelegate() {
		return new ListAttributeJoin(
				criteriaBuilder(),
				getJavaType(),
				(PathImplementor) getParentPath(),
				getAttribute(),
				getJoinType()
		);
	}

	@Override
	public ListAttributeJoin on(Predicate... restrictions) {
		return (ListAttributeJoin) super.on( restrictions );
	}

	@Override
	public ListAttributeJoin on(Expression restriction) {
		return (ListAttributeJoin) super.on( restriction );
	}

	@Override
	public  ListAttributeJoin treatAs(Class treatAsType) {
		return new TreatedListAttributeJoin( this, treatAsType );
	}

	public static class TreatedListAttributeJoin extends ListAttributeJoin {
		private final ListAttributeJoin original;
		private final Class treatAsType;

		@SuppressWarnings("unchecked")
		public TreatedListAttributeJoin(ListAttributeJoin original, Class treatAsType) {
			super(
					original.criteriaBuilder(),
					treatAsType,
					original.getPathSource(),
					(ListAttribute) original.getAttribute(),
					original.getJoinType()
			);
			this.original = original;
			this.treatAsType = treatAsType;
		}

		@Override
		public String getAlias() {
			return isCorrelated() ? getCorrelationParent().getAlias() : super.getAlias();
		}

		@Override
		public void prepareAlias(RenderingContext renderingContext) {
			if ( getAlias() == null ) {
				if ( isCorrelated() ) {
					setAlias( getCorrelationParent().getAlias() );
				}
				else {
					setAlias( renderingContext.generateAlias() );
				}
			}
		}

		@Override
		protected void setAlias(String alias) {
			super.setAlias( alias );
			original.setAlias( alias );
		}

		@Override
		public String render(RenderingContext renderingContext) {
			return "treat(" + original.render( renderingContext ) + " as " + treatAsType.getName() + ")";
		}

		@Override
		protected ManagedType locateManagedType() {
			return criteriaBuilder().getEntityManagerFactory().getMetamodel().managedType( treatAsType );
		}

		@Override
		public String getPathIdentifier() {
			return "treat(" + getAlias() + " as " + treatAsType.getName() + ")";
		}

		@Override
		protected PathSource getPathSourceForSubPaths() {
			return this;
		}
	}
}