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Hibernate example source code file (IntoClause.java)

This example Hibernate source code file (IntoClause.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Hibernate tags/keywords

arraylist, ast, hqlsqlwalkernode, intoclause, jdbc, list, queryable, queryable, queryexception, queryexception, sql, string, string, stringbuffer, type, type, util

The Hibernate IntoClause.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Middleware LLC.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 *
 */
package org.hibernate.hql.internal.ast.tree;

import java.sql.Types;
import java.util.ArrayList;
import java.util.List;
import org.hibernate.QueryException;
import org.hibernate.internal.util.collections.ArrayHelper;
import org.hibernate.persister.entity.Queryable;
import org.hibernate.type.Type;
import antlr.collections.AST;

/**
 * Represents an entity referenced in the INTO clause of an HQL
 * INSERT statement.
 *
 * @author Steve Ebersole
 */
public class IntoClause extends HqlSqlWalkerNode implements DisplayableNode {

	private Queryable persister;
	private String columnSpec = "";
	private Type[] types;

	private boolean discriminated;
	private boolean explicitIdInsertion;
	private boolean explicitVersionInsertion;


	public void initialize(Queryable persister) {
		if ( persister.isAbstract() ) {
			throw new QueryException( "cannot insert into abstract class (no table)" );
		}
		this.persister = persister;
		initializeColumns();

		if ( getWalker().getSessionFactoryHelper().hasPhysicalDiscriminatorColumn( persister ) ) {
			discriminated = true;
			columnSpec += ", " + persister.getDiscriminatorColumnName();
		}

		resetText();
	}

	private void resetText() {
		setText( "into " + getTableName() + " ( " + columnSpec + " )" );
	}

	public String getTableName() {
		return persister.getSubclassTableName( 0 );
	}

	public Queryable getQueryable() {
		return persister;
	}

	public String getEntityName() {
		return persister.getEntityName();
	}

	public Type[] getInsertionTypes() {
		return types;
	}

	public boolean isDiscriminated() {
		return discriminated;
	}

	public boolean isExplicitIdInsertion() {
		return explicitIdInsertion;
	}

	public boolean isExplicitVersionInsertion() {
		return explicitVersionInsertion;
	}

	public void prependIdColumnSpec() {
		columnSpec = persister.getIdentifierColumnNames()[0] + ", " + columnSpec;
		resetText();
	}

	public void prependVersionColumnSpec() {
		columnSpec = persister.getPropertyColumnNames( persister.getVersionProperty() )[0] + ", " + columnSpec;
		resetText();
	}

	public void validateTypes(SelectClause selectClause) throws QueryException {
		Type[] selectTypes = selectClause.getQueryReturnTypes();
		if ( selectTypes.length != types.length ) {
			throw new QueryException( "number of select types did not match those for insert" );
		}

		for ( int i = 0; i < types.length; i++ ) {
			if ( !areCompatible( types[i], selectTypes[i] ) ) {
				throw new QueryException(
				        "insertion type [" + types[i] + "] and selection type [" +
				        selectTypes[i] + "] at position " + i + " are not compatible"
				);
			}
		}

		// otherwise, everything ok.
	}

	/**
	 * Returns additional display text for the AST node.
	 *
	 * @return String - The additional display text.
	 */
	public String getDisplayText() {
		StringBuffer buf = new StringBuffer();
		buf.append( "IntoClause{" );
		buf.append( "entityName=" ).append( getEntityName() );
		buf.append( ",tableName=" ).append( getTableName() );
		buf.append( ",columns={" ).append( columnSpec ).append( "}" );
		buf.append( "}" );
		return buf.toString();
	}

	private void initializeColumns() {
		AST propertySpec = getFirstChild();
		List types = new ArrayList();
		visitPropertySpecNodes( propertySpec.getFirstChild(), types );
		this.types = ArrayHelper.toTypeArray( types );
		columnSpec = columnSpec.substring( 0, columnSpec.length() - 2 );
	}

	private void visitPropertySpecNodes(AST propertyNode, List types) {
		if ( propertyNode == null ) {
			return;
		}
		// TODO : we really need to be able to deal with component paths here also;
		// this is difficult because the hql-sql grammar expects all those node types
		// to be FromReferenceNodes.  One potential fix here would be to convert the
		// IntoClause to just use a FromClause/FromElement combo (as a child of the
		// InsertStatement) and move all this logic into the InsertStatement.  That's
		// probably the easiest approach (read: least amount of changes to the grammar
		// and code), but just doesn't feel right as then an insert would contain
		// 2 from-clauses
		String name = propertyNode.getText();
		if ( isSuperclassProperty( name ) ) {
			throw new QueryException( "INSERT statements cannot refer to superclass/joined properties [" + name + "]" );
		}

		if ( name.equals( persister.getIdentifierPropertyName() ) ) {
			explicitIdInsertion = true;
		}

		if ( persister.isVersioned() ) {
			if ( name.equals( persister.getPropertyNames()[ persister.getVersionProperty() ] ) ) {
				explicitVersionInsertion = true;
			}
		}

		String[] columnNames = persister.toColumns( name );
		renderColumns( columnNames );
		types.add( persister.toType( name ) );

		// visit width-first, then depth
		visitPropertySpecNodes( propertyNode.getNextSibling(), types );
		visitPropertySpecNodes( propertyNode.getFirstChild(), types );
	}

	private void renderColumns(String[] columnNames) {
		for ( int i = 0; i < columnNames.length; i++ ) {
			columnSpec += columnNames[i] + ", ";
		}
	}

	private boolean isSuperclassProperty(String propertyName) {
		// really there are two situations where it should be ok to allow the insertion
		// into properties defined on a superclass:
		//      1) union-subclass with an abstract root entity
		//      2) discrim-subclass
		//
		// #1 is handled already because of the fact that
		// UnionSubclassPersister alreay always returns 0
		// for this call...
		//
		// we may want to disallow it for discrim-subclass just for
		// consistency-sake (currently does not work anyway)...
		return persister.getSubclassPropertyTableNumber( propertyName ) != 0;
	}

	/**
	 * Determine whether the two types are "assignment compatible".
	 *
	 * @param target The type defined in the into-clause.
	 * @param source The type defined in the select clause.
	 * @return True if they are assignment compatible.
	 */
	private boolean areCompatible(Type target, Type source) {
		if ( target.equals( source ) ) {
			// if the types report logical equivalence, return true...
			return true;
		}

		// otherwise, doAfterTransactionCompletion a "deep equivalence" check...

		if ( !target.getReturnedClass().isAssignableFrom( source.getReturnedClass() ) ) {
			return false;
		}

		int[] targetDatatypes = target.sqlTypes( getSessionFactoryHelper().getFactory() );
		int[] sourceDatatypes = source.sqlTypes( getSessionFactoryHelper().getFactory() );

		if ( targetDatatypes.length != sourceDatatypes.length ) {
			return false;
		}

		for ( int i = 0; i < targetDatatypes.length; i++ ) {
			if ( !areSqlTypesCompatible( targetDatatypes[i], sourceDatatypes[i] ) ) {
				return false;
			}
		}

		return true;
	}

	private boolean areSqlTypesCompatible(int target, int source) {
		switch ( target ) {
			case Types.TIMESTAMP:
				return source == Types.DATE || source == Types.TIME || source == Types.TIMESTAMP;
			case Types.DATE:
				return source == Types.DATE || source == Types.TIMESTAMP;
			case Types.TIME:
				return source == Types.TIME || source == Types.TIMESTAMP;
			default:
				return target == source;
		}
	}
}

Other Hibernate examples (source code examples)

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