/*******************************************************************************
 * Copyright (c) 2009, 2011 Oracle. 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:
 *     Oracle - initial API and implementation
 ******************************************************************************/
package org.eclipse.jpt.jpa.core.internal.jpa2.context.java;

import org.eclipse.jdt.core.dom.CompilationUnit;
import org.eclipse.jpt.common.core.utility.TextRange;
import org.eclipse.jpt.common.utility.internal.StringTools;
import org.eclipse.jpt.common.utility.internal.Tools;
import org.eclipse.jpt.common.utility.internal.iterables.EmptyIterable;
import org.eclipse.jpt.jpa.core.context.Entity;
import org.eclipse.jpt.jpa.core.context.PersistentAttribute;
import org.eclipse.jpt.jpa.core.context.ReadOnlyBaseJoinColumn;
import org.eclipse.jpt.jpa.core.context.ReadOnlyJoinColumn;
import org.eclipse.jpt.jpa.core.context.ReadOnlyNamedColumn;
import org.eclipse.jpt.jpa.core.context.TypeMapping;
import org.eclipse.jpt.jpa.core.context.java.JavaReadOnlyJoinColumn;
import org.eclipse.jpt.jpa.core.internal.context.JoinColumnTextRangeResolver;
import org.eclipse.jpt.jpa.core.internal.context.JptValidator;
import org.eclipse.jpt.jpa.core.internal.context.MappingTools;
import org.eclipse.jpt.jpa.core.internal.context.NamedColumnTextRangeResolver;
import org.eclipse.jpt.jpa.core.internal.jpa1.context.CollectionTableTableDescriptionProvider;
import org.eclipse.jpt.jpa.core.internal.jpa1.context.JoinColumnValidator;
import org.eclipse.jpt.jpa.core.internal.jpa1.context.java.GenericJavaReferenceTable;
import org.eclipse.jpt.jpa.core.jpa2.context.java.JavaCollectionTable2_0;
import org.eclipse.jpt.jpa.core.jpa2.context.java.JavaElementCollectionMapping2_0;
import org.eclipse.jpt.jpa.core.jpa2.resource.java.CollectionTable2_0Annotation;

/**
 * Java collection table
 */
public class GenericJavaCollectionTable2_0
	extends GenericJavaReferenceTable<CollectionTable2_0Annotation>
	implements JavaCollectionTable2_0
{
	public GenericJavaCollectionTable2_0(JavaElementCollectionMapping2_0 parent, Owner owner) {
		super(parent, owner);
	}

	@Override
	protected JavaReadOnlyJoinColumn.Owner buildJoinColumnOwner() {
		return new JoinColumnOwner();
	}


	// ********** table annotation **********

	@Override
	public CollectionTable2_0Annotation getTableAnnotation() {
		return (CollectionTable2_0Annotation) this.getElementCollectionMapping().getResourceAttribute().getNonNullAnnotation(CollectionTable2_0Annotation.ANNOTATION_NAME);
	}

	@Override
	protected void removeTableAnnotation() {
		this.getElementCollectionMapping().getResourceAttribute().removeAnnotation(CollectionTable2_0Annotation.ANNOTATION_NAME);
	}


	// ********** misc **********

	public PersistentAttribute getPersistentAttribute() {
		return this.getElementCollectionMapping().getPersistentAttribute();
	}

	@Override
	public JavaElementCollectionMapping2_0 getParent() {
		return (JavaElementCollectionMapping2_0) super.getParent();
	}

	protected JavaElementCollectionMapping2_0 getElementCollectionMapping() {
		return this.getParent();
	}

	@Override
	protected String buildDefaultName() {
		return MappingTools.buildCollectionTableDefaultName(this.getElementCollectionMapping());
	}


	// ********** validation **********

	public boolean validatesAgainstDatabase() {
		return this.getElementCollectionMapping().validatesAgainstDatabase();
	}


	// ********** join column owner **********

	/**
	 * owner for "back-pointer" join columns;
	 * these point at the source/owning entity
	 */
	protected class JoinColumnOwner
		implements JavaReadOnlyJoinColumn.Owner
	{
		protected JoinColumnOwner() {
			super();
		}

		public TypeMapping getTypeMapping() {
			return GenericJavaCollectionTable2_0.this.getElementCollectionMapping().getTypeMapping();
		}

		public org.eclipse.jpt.jpa.db.Table resolveDbTable(String tableName) {
			return Tools.valuesAreEqual(GenericJavaCollectionTable2_0.this.getName(), tableName) ?
					GenericJavaCollectionTable2_0.this.getDbTable() :
					null;
		}

		public String getDefaultColumnName() {
			//built in MappingTools.buildJoinColumnDefaultName()
			return null;
		}

		/**
		 * by default, the join column is, obviously, in the collection table;
		 * not sure whether it can be anywhere else...
		 */
		public String getDefaultTableName() {
			return GenericJavaCollectionTable2_0.this.getName();
		}

		public TextRange getValidationTextRange(CompilationUnit astRoot) {
			return GenericJavaCollectionTable2_0.this.getValidationTextRange(astRoot);
		}

		public org.eclipse.jpt.jpa.db.Table getReferencedColumnDbTable() {
			return this.getTypeMapping().getPrimaryDbTable();
		}

		public boolean joinColumnIsDefault(ReadOnlyBaseJoinColumn joinColumn) {
			return GenericJavaCollectionTable2_0.this.getDefaultJoinColumn() == joinColumn;
		}

		/**
		 * If there is a specified table name it needs to be the same
		 * the default table name. The table is always the collection table.
		 */
		public boolean tableNameIsInvalid(String tableName) {
			return ! StringTools.stringsAreEqual(this.getDefaultTableName(), tableName);
		}

		/**
		 * the join column can only be on the collection table itself
		 */
		public Iterable<String> getCandidateTableNames() {
			return EmptyIterable.instance();
		}

		public Entity getRelationshipTarget() {
			return GenericJavaCollectionTable2_0.this.getElementCollectionMapping().getEntity();
		}

		public String getAttributeName() {
			return null; //I *think* this is correct
			//return GenericJavaCollectionTable2_0.this.getParent().getName();
		}

		protected PersistentAttribute getPersistentAttribute() {
			return GenericJavaCollectionTable2_0.this.getElementCollectionMapping().getPersistentAttribute();
		}

		public int getJoinColumnsSize() {
			return GenericJavaCollectionTable2_0.this.getJoinColumnsSize();
		}

		public JptValidator buildColumnValidator(ReadOnlyNamedColumn column, NamedColumnTextRangeResolver textRangeResolver) {
			return new JoinColumnValidator(this.getPersistentAttribute(), (ReadOnlyJoinColumn) column, this, (JoinColumnTextRangeResolver) textRangeResolver, new CollectionTableTableDescriptionProvider());
		}
	}
}