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/*
* 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.cache;
import java.io.Serializable;
import java.io.IOException;
import java.util.Map;
import java.util.Set;
import java.util.Iterator;
import org.hibernate.EntityMode;
import org.hibernate.engine.QueryParameters;
import org.hibernate.engine.RowSelection;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.engine.TypedValue;
import org.hibernate.transform.ResultTransformer;
import org.hibernate.type.Type;
import org.hibernate.util.EqualsHelper;
import org.hibernate.util.CollectionHelper;
/**
* A key that identifies a particular query with bound parameter values. This is the object Hibernate uses
* as its key into its query cache.
*
* @author Gavin King
* @author Steve Ebersole
*/
public class QueryKey implements Serializable {
private final String sqlQueryString;
private final Type[] positionalParameterTypes;
private final Object[] positionalParameterValues;
private final Map namedParameters;
private final Integer firstRow;
private final Integer maxRows;
private final EntityMode entityMode;
private final Set filterKeys;
// the user provided resulttransformer, not the one used with "select new". Here to avoid mangling
// transformed/non-transformed results.
private final ResultTransformer customTransformer;
/**
* For performance reasons, the hashCode is cached; however, it is marked transient so that it can be
* recalculated as part of the serialization process which allows distributed query caches to work properly.
*/
private transient int hashCode;
/**
* Generates a QueryKey.
*
* @param queryString The sql query string.
* @param queryParameters The query parameters
* @param filterKeys The keys of any enabled filters.
* @param session The current session.
*
* @return The generate query cache key.
*/
public static QueryKey generateQueryKey(
String queryString,
QueryParameters queryParameters,
Set filterKeys,
SessionImplementor session) {
// disassemble positional parameters
final int positionalParameterCount = queryParameters.getPositionalParameterTypes().length;
final Type[] types = new Type[positionalParameterCount];
final Object[] values = new Object[positionalParameterCount];
for ( int i = 0; i < positionalParameterCount; i++ ) {
types[i] = queryParameters.getPositionalParameterTypes()[i];
values[i] = types[i].disassemble( queryParameters.getPositionalParameterValues()[i], session, null );
}
// disassemble named parameters
final Map namedParameters;
if ( queryParameters.getNamedParameters() == null ) {
namedParameters = null;
}
else {
namedParameters = CollectionHelper.mapOfSize( queryParameters.getNamedParameters().size() );
Iterator itr = queryParameters.getNamedParameters().entrySet().iterator();
while ( itr.hasNext() ) {
final Map.Entry namedParameterEntry = ( Map.Entry ) itr.next();
final TypedValue original = ( TypedValue ) namedParameterEntry.getValue();
namedParameters.put(
namedParameterEntry.getKey(),
new TypedValue(
original.getType(),
original.getType().disassemble( original.getValue(), session, null ),
session.getEntityMode()
)
);
}
}
// decode row selection...
final RowSelection selection = queryParameters.getRowSelection();
final Integer firstRow;
final Integer maxRows;
if ( selection != null ) {
firstRow = selection.getFirstRow();
maxRows = selection.getMaxRows();
}
else {
firstRow = null;
maxRows = null;
}
return new QueryKey(
queryString,
types,
values,
namedParameters,
firstRow,
maxRows,
filterKeys,
session.getEntityMode(),
queryParameters.getResultTransformer()
);
}
/**
* Package-protected constructor.
*
* @param sqlQueryString The sql query string.
* @param positionalParameterTypes Positional parameter types.
* @param positionalParameterValues Positional parameter values.
* @param namedParameters Named parameters.
* @param firstRow First row selection, if any.
* @param maxRows Max-rows selection, if any.
* @param filterKeys Enabled filter keys, if any.
* @param entityMode The entity mode.
* @param customTransformer Custom result transformer, if one.
*/
QueryKey(
String sqlQueryString,
Type[] positionalParameterTypes,
Object[] positionalParameterValues,
Map namedParameters,
Integer firstRow,
Integer maxRows,
Set filterKeys,
EntityMode entityMode,
ResultTransformer customTransformer) {
this.sqlQueryString = sqlQueryString;
this.positionalParameterTypes = positionalParameterTypes;
this.positionalParameterValues = positionalParameterValues;
this.namedParameters = namedParameters;
this.firstRow = firstRow;
this.maxRows = maxRows;
this.entityMode = entityMode;
this.filterKeys = filterKeys;
this.customTransformer = customTransformer;
this.hashCode = generateHashCode();
}
/**
* Deserialization hook used to re-init the cached hashcode which is needed for proper clustering support.
*
* @param in The object input stream.
*
* @throws IOException Thrown by normal deserialization
* @throws ClassNotFoundException Thrown by normal deserialization
*/
private void readObject(java.io.ObjectInputStream in) throws IOException, ClassNotFoundException {
in.defaultReadObject();
this.hashCode = generateHashCode();
}
private int generateHashCode() {
int result = 13;
result = 37 * result + ( firstRow==null ? 0 : firstRow.hashCode() );
result = 37 * result + ( maxRows==null ? 0 : maxRows.hashCode() );
for ( int i=0; i< positionalParameterValues.length; i++ ) {
result = 37 * result + ( positionalParameterValues[i]==null ? 0 : positionalParameterTypes[i].getHashCode( positionalParameterValues[i], entityMode ) );
}
result = 37 * result + ( namedParameters==null ? 0 : namedParameters.hashCode() );
result = 37 * result + ( filterKeys ==null ? 0 : filterKeys.hashCode() );
result = 37 * result + ( customTransformer==null ? 0 : customTransformer.hashCode() );
result = 37 * result + sqlQueryString.hashCode();
return result;
}
/**
* {@inheritDoc}
*/
public boolean equals(Object other) {
if ( !( other instanceof QueryKey ) ) {
return false;
}
QueryKey that = ( QueryKey ) other;
if ( !sqlQueryString.equals( that.sqlQueryString ) ) {
return false;
}
if ( !EqualsHelper.equals( firstRow, that.firstRow ) || !EqualsHelper.equals( maxRows, that.maxRows ) ) {
return false;
}
if ( !EqualsHelper.equals( customTransformer, that.customTransformer ) ) {
return false;
}
if ( positionalParameterTypes == null ) {
if ( that.positionalParameterTypes != null ) {
return false;
}
}
else {
if ( that.positionalParameterTypes == null ) {
return false;
}
if ( positionalParameterTypes.length != that.positionalParameterTypes.length ) {
return false;
}
for ( int i = 0; i < positionalParameterTypes.length; i++ ) {
if ( positionalParameterTypes[i].getReturnedClass() != that.positionalParameterTypes[i].getReturnedClass() ) {
return false;
}
if ( !positionalParameterTypes[i].isEqual( positionalParameterValues[i], that.positionalParameterValues[i], entityMode ) ) {
return false;
}
}
}
return EqualsHelper.equals( filterKeys, that.filterKeys )
&& EqualsHelper.equals( namedParameters, that.namedParameters );
}
/**
* {@inheritDoc}
*/
public int hashCode() {
return hashCode;
}
/**
* {@inheritDoc}
*/
public String toString() {
StringBuffer buf = new StringBuffer()
.append( "sql: " )
.append( sqlQueryString );
if ( positionalParameterValues != null ) {
buf.append( "; parameters: " );
for ( int i = 0; i < positionalParameterValues.length; i++ ) {
buf.append( positionalParameterValues[i] ).append( ", " );
}
}
if ( namedParameters != null ) {
buf.append( "; named parameters: " ).append( namedParameters );
}
if ( filterKeys != null ) {
buf.append( "; filterKeys: " ).append( filterKeys );
}
if ( firstRow != null ) {
buf.append( "; first row: " ).append( firstRow );
}
if ( maxRows != null ) {
buf.append( "; max rows: " ).append( maxRows );
}
if ( customTransformer != null ) {
buf.append( "; transformer: " ).append( customTransformer );
}
return buf.toString();
}
}
