org.hibernate.envers.internal.tools.query.UpdateBuilder Maven / Gradle / Ivy
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or .
*/
package org.hibernate.envers.internal.tools.query;
import java.util.HashMap;
import java.util.Map;
import org.hibernate.Session;
import org.hibernate.envers.internal.tools.MutableInteger;
import org.hibernate.query.Query;
/**
* @author Lukasz Antoniak (lukasz dot antoniak at gmail dot com)
*/
public class UpdateBuilder {
private final String entityName;
private final String alias;
private final MutableInteger paramCounter;
private final Parameters rootParameters;
private final Map updates;
public UpdateBuilder(String entityName, String alias) {
this( entityName, alias, new MutableInteger() );
}
private UpdateBuilder(String entityName, String alias, MutableInteger paramCounter) {
this.entityName = entityName;
this.alias = alias;
this.paramCounter = paramCounter;
rootParameters = new Parameters( alias, "and", paramCounter );
updates = new HashMap<>();
}
public Parameters getRootParameters() {
return rootParameters;
}
public void updateValue(String propertyName, Object value) {
updates.put( propertyName, value );
}
public void build(StringBuilder sb, Map updateParamValues) {
sb.append( "update " ).append( entityName ).append( " " ).append( alias );
sb.append( " set " );
int i = 1;
for ( java.util.Map.Entry entry : updates.entrySet() ) {
final String property = entry.getKey();
final String paramName = generateParameterName();
sb.append( alias ).append( "." ).append( property ).append( " = " ).append( ":" ).append( paramName );
updateParamValues.put( paramName, entry.getValue() );
if ( i < updates.size() ) {
sb.append( ", " );
}
++i;
}
if ( !rootParameters.isEmpty() ) {
sb.append( " where " );
rootParameters.build( sb, updateParamValues );
}
}
private String generateParameterName() {
return "_u" + paramCounter.getAndIncrease();
}
public Query toQuery(Session session) {
final StringBuilder querySb = new StringBuilder();
final Map queryParamValues = new HashMap<>();
build( querySb, queryParamValues );
final Query query = session.createQuery( querySb.toString() );
for ( Map.Entry paramValue : queryParamValues.entrySet() ) {
query.setParameter( paramValue.getKey(), paramValue.getValue() );
}
return query;
}
}