Hibernate example source code file (SimpleValue.java)

This example Hibernate source code file (SimpleValue.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

iterator, mappingexception, mappingexception, mappings, object, properties, properties, simplevalue, string, string, stringbuffer, table, table, type, util

The Hibernate SimpleValue.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2010, Red Hat Inc. 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 Inc.
 *
 * 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.mapping;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;
import org.hibernate.FetchMode;
import org.hibernate.MappingException;
import org.hibernate.cfg.Environment;
import org.hibernate.cfg.Mappings;
import org.hibernate.dialect.Dialect;
import org.hibernate.engine.spi.Mapping;
import org.hibernate.id.IdentifierGenerator;
import org.hibernate.id.IdentityGenerator;
import org.hibernate.id.PersistentIdentifierGenerator;
import org.hibernate.id.factory.IdentifierGeneratorFactory;
import org.hibernate.internal.util.ReflectHelper;
import org.hibernate.type.Type;

/**
 * Any value that maps to columns.
 * @author Gavin King
 */
public class SimpleValue implements KeyValue {
	public static final String DEFAULT_ID_GEN_STRATEGY = "assigned";

	private final Mappings mappings;

	private final List columns = new ArrayList();
	private String typeName;
	private Properties identifierGeneratorProperties;
	private String identifierGeneratorStrategy = DEFAULT_ID_GEN_STRATEGY;
	private String nullValue;
	private Table table;
	private String foreignKeyName;
	private boolean alternateUniqueKey;
	private Properties typeParameters;
	private boolean cascadeDeleteEnabled;

	public SimpleValue(Mappings mappings) {
		this.mappings = mappings;
	}

	public SimpleValue(Mappings mappings, Table table) {
		this( mappings );
		this.table = table;
	}

	public Mappings getMappings() {
		return mappings;
	}

	public boolean isCascadeDeleteEnabled() {
		return cascadeDeleteEnabled;
	}

	public void setCascadeDeleteEnabled(boolean cascadeDeleteEnabled) {
		this.cascadeDeleteEnabled = cascadeDeleteEnabled;
	}
	
	public void addColumn(Column column) {
		if ( !columns.contains(column) ) columns.add(column);
		column.setValue(this);
		column.setTypeIndex( columns.size()-1 );
	}
	
	public void addFormula(Formula formula) {
		columns.add(formula);
	}
	
	public boolean hasFormula() {
		Iterator iter = getColumnIterator();
		while ( iter.hasNext() ) {
			Object o = iter.next();
			if (o instanceof Formula) return true;
		}
		return false;
	}

	public int getColumnSpan() {
		return columns.size();
	}
	public Iterator getColumnIterator() {
		return columns.iterator();
	}
	public List getConstraintColumns() {
		return columns;
	}
	public String getTypeName() {
		return typeName;
	}
	public void setTypeName(String type) {
		this.typeName = type;
	}
	public void setTable(Table table) {
		this.table = table;
	}

	public void createForeignKey() throws MappingException {}

	public void createForeignKeyOfEntity(String entityName) {
		if ( !hasFormula() && !"none".equals(getForeignKeyName())) {
			ForeignKey fk = table.createForeignKey( getForeignKeyName(), getConstraintColumns(), entityName );
			fk.setCascadeDeleteEnabled(cascadeDeleteEnabled);
		}
	}

	public IdentifierGenerator createIdentifierGenerator(
			IdentifierGeneratorFactory identifierGeneratorFactory,
			Dialect dialect, 
			String defaultCatalog, 
			String defaultSchema, 
			RootClass rootClass) throws MappingException {
		
		Properties params = new Properties();
		
		//if the hibernate-mapping did not specify a schema/catalog, use the defaults
		//specified by properties - but note that if the schema/catalog were specified
		//in hibernate-mapping, or as params, they will already be initialized and
		//will override the values set here (they are in identifierGeneratorProperties)
		if ( defaultSchema!=null ) {
			params.setProperty(PersistentIdentifierGenerator.SCHEMA, defaultSchema);
		}
		if ( defaultCatalog!=null ) {
			params.setProperty(PersistentIdentifierGenerator.CATALOG, defaultCatalog);
		}
		
		//pass the entity-name, if not a collection-id
		if (rootClass!=null) {
			params.setProperty( IdentifierGenerator.ENTITY_NAME, rootClass.getEntityName() );
		}
		
		//init the table here instead of earlier, so that we can get a quoted table name
		//TODO: would it be better to simply pass the qualified table name, instead of
		//      splitting it up into schema/catalog/table names
		String tableName = getTable().getQuotedName(dialect);
		params.setProperty( PersistentIdentifierGenerator.TABLE, tableName );
		
		//pass the column name (a generated id almost always has a single column)
		String columnName = ( (Column) getColumnIterator().next() ).getQuotedName(dialect);
		params.setProperty( PersistentIdentifierGenerator.PK, columnName );
		
		if (rootClass!=null) {
			StringBuffer tables = new StringBuffer();
			Iterator iter = rootClass.getIdentityTables().iterator();
			while ( iter.hasNext() ) {
				Table table= (Table) iter.next();
				tables.append( table.getQuotedName(dialect) );
				if ( iter.hasNext() ) tables.append(", ");
			}
			params.setProperty( PersistentIdentifierGenerator.TABLES, tables.toString() );
		}
		else {
			params.setProperty( PersistentIdentifierGenerator.TABLES, tableName );
		}

		if (identifierGeneratorProperties!=null) {
			params.putAll(identifierGeneratorProperties);
		}

		// TODO : we should pass along all settings once "config lifecycle" is hashed out...
		params.put(
				Environment.PREFER_POOLED_VALUES_LO,
				mappings.getConfigurationProperties().getProperty( Environment.PREFER_POOLED_VALUES_LO, "false" )
		);

		identifierGeneratorFactory.setDialect( dialect );
		return identifierGeneratorFactory.createIdentifierGenerator( identifierGeneratorStrategy, getType(), params );
		
	}

	public boolean isUpdateable() {
		//needed to satisfy KeyValue
		return true;
	}
	
	public FetchMode getFetchMode() {
		return FetchMode.SELECT;
	}

	public Properties getIdentifierGeneratorProperties() {
		return identifierGeneratorProperties;
	}

	public String getNullValue() {
		return nullValue;
	}

	public Table getTable() {
		return table;
	}

	/**
	 * Returns the identifierGeneratorStrategy.
	 * @return String
	 */
	public String getIdentifierGeneratorStrategy() {
		return identifierGeneratorStrategy;
	}
	
	public boolean isIdentityColumn(IdentifierGeneratorFactory identifierGeneratorFactory, Dialect dialect) {
		identifierGeneratorFactory.setDialect( dialect );
		return identifierGeneratorFactory.getIdentifierGeneratorClass( identifierGeneratorStrategy )
				.equals( IdentityGenerator.class );
	}

	/**
	 * Sets the identifierGeneratorProperties.
	 * @param identifierGeneratorProperties The identifierGeneratorProperties to set
	 */
	public void setIdentifierGeneratorProperties(Properties identifierGeneratorProperties) {
		this.identifierGeneratorProperties = identifierGeneratorProperties;
	}

	/**
	 * Sets the identifierGeneratorStrategy.
	 * @param identifierGeneratorStrategy The identifierGeneratorStrategy to set
	 */
	public void setIdentifierGeneratorStrategy(String identifierGeneratorStrategy) {
		this.identifierGeneratorStrategy = identifierGeneratorStrategy;
	}

	/**
	 * Sets the nullValue.
	 * @param nullValue The nullValue to set
	 */
	public void setNullValue(String nullValue) {
		this.nullValue = nullValue;
	}

	public String getForeignKeyName() {
		return foreignKeyName;
	}

	public void setForeignKeyName(String foreignKeyName) {
		this.foreignKeyName = foreignKeyName;
	}

	public boolean isAlternateUniqueKey() {
		return alternateUniqueKey;
	}

	public void setAlternateUniqueKey(boolean unique) {
		this.alternateUniqueKey = unique;
	}

	public boolean isNullable() {
		if ( hasFormula() ) return true;
		boolean nullable = true;
		Iterator iter = getColumnIterator();
		while ( iter.hasNext() ) {
			if ( !( (Column) iter.next() ).isNullable() ) {
				nullable = false;
				return nullable; //shortcut
			}
		}
		return nullable;
	}

	public boolean isSimpleValue() {
		return true;
	}

	public boolean isValid(Mapping mapping) throws MappingException {
		return getColumnSpan()==getType().getColumnSpan(mapping);
	}

	public Type getType() throws MappingException {
		if (typeName==null) {
			throw new MappingException("No type name");
		}
		Type result = mappings.getTypeResolver().heuristicType(typeName, typeParameters);
		if (result==null) {
			String msg = "Could not determine type for: " + typeName;
			if(table != null){
				msg += ", at table: " + table.getName();
			}
			if(columns!=null && columns.size()>0) {
				msg += ", for columns: " + columns;
			}
			throw new MappingException(msg);
		}
		return result;
	}

	public void setTypeUsingReflection(String className, String propertyName) throws MappingException {
		if (typeName==null) {
			if (className==null) {
				throw new MappingException("you must specify types for a dynamic entity: " + propertyName);
			}
			typeName = ReflectHelper.reflectedPropertyClass(className, propertyName).getName();
		}
	}

	public boolean isTypeSpecified() {
		return typeName!=null;
	}

	public void setTypeParameters(Properties parameterMap) {
		this.typeParameters = parameterMap;
	}
	
	public Properties getTypeParameters() {
		return typeParameters;
	}

	@Override
    public String toString() {
		return getClass().getName() + '(' + columns.toString() + ')';
	}

	public Object accept(ValueVisitor visitor) {
		return visitor.accept(this);
	}
	
	public boolean[] getColumnInsertability() {
		boolean[] result = new boolean[ getColumnSpan() ];
		int i = 0;
		Iterator iter = getColumnIterator();
		while ( iter.hasNext() ) {
			Selectable s = (Selectable) iter.next();
			result[i++] = !s.isFormula();
		}
		return result;
	}
	
	public boolean[] getColumnUpdateability() {
		return getColumnInsertability();
	}
}