componenttype.java

hibernate-3.1.3-all-src.zip 面向对象的访问数据库工具

//$Id: ComponentType.java 7670 2005-07-29 05:36:14Z oneovthafew $
package org.hibernate.type;

import java.io.Serializable;
import java.lang.reflect.Method;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.Map;

import org.dom4j.Element;
import org.dom4j.Node;
import org.hibernate.EntityMode;
import org.hibernate.FetchMode;
import org.hibernate.HibernateException;
import org.hibernate.MappingException;
import org.hibernate.engine.CascadeStyle;
import org.hibernate.engine.Mapping;
import org.hibernate.engine.SessionFactoryImplementor;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.tuple.ComponentTuplizer;
import org.hibernate.tuple.TuplizerLookup;
import org.hibernate.util.ArrayHelper;
import org.hibernate.util.StringHelper;

/**
 * Handles "component" mappings
 *
 * @author Gavin King
 */
public class ComponentType extends AbstractType implements AbstractComponentType {

	private final Type[] propertyTypes;
	private final String[] propertyNames;
	private final boolean[] propertyNullability;
	protected final int propertySpan;
	private final CascadeStyle[] cascade;
	private final FetchMode[] joinedFetch;
	private final boolean isKey;
	
	protected TuplizerLookup tuplizers;

	public int[] sqlTypes(Mapping mapping) throws MappingException {
		//Not called at runtime so doesn't matter if its slow :)
		int[] sqlTypes = new int[getColumnSpan( mapping )];
		int n = 0;
		for ( int i = 0; i < propertySpan; i++ ) {
			int[] subtypes = propertyTypes[i].sqlTypes( mapping );
			for ( int j = 0; j < subtypes.length; j++ ) {
				sqlTypes[n++] = subtypes[j];
			}
		}
		return sqlTypes;
	}

	public int getColumnSpan(Mapping mapping) throws MappingException {
		int span = 0;
		for ( int i = 0; i < propertySpan; i++ ) {
			span += propertyTypes[i].getColumnSpan( mapping );
		}
		return span;
	}

	public ComponentType(
			final String[] propertyNames,
			final Type[] propertyTypes,
			final boolean[] nullabilities,
			final FetchMode[] joinedFetch,
			final CascadeStyle[] cascade,
			final boolean key,
			final TuplizerLookup tuplizers) 
	throws MappingException {

		this.propertyTypes = propertyTypes;
		this.propertyNullability = nullabilities;
		this.propertyNames = propertyNames;
		this.cascade = cascade;
		this.joinedFetch = joinedFetch;
		isKey = key;
		propertySpan = propertyTypes.length;
		this.tuplizers = tuplizers;
	}

	public final boolean isComponentType() {
		return true;
	}

	public Class getReturnedClass() {
		return tuplizers.getTuplizer(EntityMode.POJO).getMappedClass(); //TODO
	}

	public boolean isSame(Object x, Object y, EntityMode entityMode) throws HibernateException {
		if ( x == y ) return true;
		if ( x == null || y == null ) return false;
		Object[] xvalues = getPropertyValues(x, entityMode);
		Object[] yvalues = getPropertyValues(y, entityMode);
		for ( int i = 0; i < propertySpan; i++ ) {
			if ( !propertyTypes[i].isSame( xvalues[i], yvalues[i], entityMode ) ) {
				return false;
			}
		}
		return true;
	}

	public boolean isEqual(Object x, Object y, EntityMode entityMode) 
	throws HibernateException {
		if ( x == y ) return true;
		if ( x == null || y == null ) return false;
		Object[] xvalues = getPropertyValues(x, entityMode);
		Object[] yvalues = getPropertyValues(y, entityMode);
		for ( int i = 0; i < propertySpan; i++ ) {
			if ( !propertyTypes[i].isEqual( xvalues[i], yvalues[i], entityMode ) ) return false;
		}
		return true;
	}

	public boolean isEqual(Object x, Object y, EntityMode entityMode, SessionFactoryImplementor factory) 
	throws HibernateException {
		if ( x == y ) return true;
		if ( x == null || y == null ) return false;
		Object[] xvalues = getPropertyValues(x, entityMode);
		Object[] yvalues = getPropertyValues(y, entityMode);
		for ( int i = 0; i < propertySpan; i++ ) {
			if ( !propertyTypes[i].isEqual( xvalues[i], yvalues[i], entityMode, factory ) ) return false;
		}
		return true;
	}

	public int compare(Object x, Object y, EntityMode entityMode) {
		if ( x == y ) return 0;
		Object[] xvalues = getPropertyValues(x, entityMode);
		Object[] yvalues = getPropertyValues(y, entityMode);
		for ( int i = 0; i < propertySpan; i++ ) {
			int propertyCompare = propertyTypes[i].compare( xvalues[i], yvalues[i], entityMode );
			if ( propertyCompare != 0 ) return propertyCompare;
		}
		return 0;
	}
	
	public boolean isMethodOf(Method method) {
		return false;
	}

	public int getHashCode(Object x, EntityMode entityMode) {
		int result = 17;
		Object[] values = getPropertyValues(x, entityMode);
		for ( int i = 0; i < propertySpan; i++ ) {
			Object y = values[i];
			result *= 37;
			if ( y != null ) result += propertyTypes[i].getHashCode( y, entityMode );
		}
		return result;
	}

	public int getHashCode(Object x, EntityMode entityMode, SessionFactoryImplementor factory) {
		int result = 17;
		Object[] values = getPropertyValues(x, entityMode);
		for ( int i = 0; i < propertySpan; i++ ) {
			Object y = values[i];
			result *= 37;
			if ( y != null ) result += propertyTypes[i].getHashCode( y, entityMode, factory );
		}
		return result;
	}

	public boolean isDirty(Object x, Object y, SessionImplementor session) 
	throws HibernateException {
		if ( x == y ) return false;
		if ( x == null || y == null ) return true;
		EntityMode entityMode = session.getEntityMode();
		Object[] xvalues = getPropertyValues(x, entityMode);
		Object[] yvalues = getPropertyValues(y, entityMode);
		for ( int i = 0; i < xvalues.length; i++ ) {
			if ( propertyTypes[i].isDirty( xvalues[i], yvalues[i], session ) ) return true;
		}
		return false;
	}

	public boolean isDirty(Object x, Object y, boolean[] checkable, SessionImplementor session) 
	throws HibernateException {
		if ( x == y ) return false;
		if ( x == null || y == null ) return true;
		EntityMode entityMode = session.getEntityMode();
		Object[] xvalues = getPropertyValues(x, entityMode);
		Object[] yvalues = getPropertyValues(y, entityMode);
		int loc = 0;
		for ( int i = 0; i < xvalues.length; i++ ) {
			int len = propertyTypes[i].getColumnSpan( session.getFactory() );
			if (len<=1) {
				final boolean dirty = ( len==0 || checkable[loc] ) && 
						propertyTypes[i].isDirty( xvalues[i], yvalues[i], session );
				if ( dirty ) return true;
			}
			else {
				boolean[] subcheckable = new boolean[len];
				System.arraycopy(checkable, loc, subcheckable, 0, len);
				final boolean dirty = propertyTypes[i].isDirty( xvalues[i], yvalues[i], subcheckable, session );
				if ( dirty ) return true;
			}
			loc += len;
		}
		return false;
	}

	public boolean isModified(Object old, Object current, boolean[] checkable, SessionImplementor session)
			throws HibernateException {
		
		if ( current == null ) return old != null;
		if ( old == null ) return current != null;
		Object[] currentValues = getPropertyValues( current, session );
		Object[] oldValues = ( Object[] ) old;
		int loc = 0;
		for ( int i = 0; i < currentValues.length; i++ ) {
			int len = propertyTypes[i].getColumnSpan( session.getFactory() );
			boolean[] subcheckable = new boolean[len];
			System.arraycopy(checkable, loc, subcheckable, 0, len);
			if ( propertyTypes[i].isModified( oldValues[i], currentValues[i], subcheckable, session ) ) {
				return true;
			}
			loc += len;
		}
		return false;
		
	}

	public Object nullSafeGet(ResultSet rs, String[] names, SessionImplementor session, Object owner)
			throws HibernateException, SQLException {
		return resolve( hydrate( rs, names, session, owner ), session, owner );
	}

	public void nullSafeSet(PreparedStatement st, Object value, int begin, SessionImplementor session)
	throws HibernateException, SQLException {

		Object[] subvalues = nullSafeGetValues( value, session.getEntityMode() );

		for ( int i = 0; i < propertySpan; i++ ) {
			propertyTypes[i].nullSafeSet( st, subvalues[i], begin, session );
			begin += propertyTypes[i].getColumnSpan( session.getFactory() );
		}
	}

	public void nullSafeSet(
			PreparedStatement st, 
			Object value, 
			int begin, 
			boolean[] settable, 
			SessionImplementor session)
	throws HibernateException, SQLException {

		Object[] subvalues = nullSafeGetValues( value, session.getEntityMode() );
		
		int loc = 0;
		for ( int i = 0; i < propertySpan; i++ ) {
			int len = propertyTypes[i].getColumnSpan( session.getFactory() );
			if (len==0) {
				//noop
			}
			else if (len==1) {
				if ( settable[loc] ) {
					propertyTypes[i].nullSafeSet( st, subvalues[i], begin, session );
					begin++;
				}
			}
			else {
				boolean[] subsettable = new boolean[len];
				System.arraycopy(settable, loc, subsettable, 0, len);
				propertyTypes[i].nullSafeSet( st, subvalues[i], begin, subsettable, session );
				begin += ArrayHelper.countTrue(subsettable);
			}
			loc += len;
		}
	}

	private Object[] nullSafeGetValues(Object value, EntityMode entityMode) throws HibernateException {
		if ( value == null ) {
			return new Object[propertySpan];
		}
		else {
			return getPropertyValues( value, entityMode );
		}
	}

	public Object nullSafeGet(ResultSet rs, String name, SessionImplementor session, Object owner)
			throws HibernateException, SQLException {

		return nullSafeGet( rs, new String[]{name}, session, owner );
	}

	public Object getPropertyValue(Object component, int i, SessionImplementor session)