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Hibernate's core ORM functionality
/*
* 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.query.criteria.internal.expression.function;
import java.io.Serializable;
import javax.persistence.criteria.Expression;
import org.hibernate.query.criteria.internal.CriteriaBuilderImpl;
import org.hibernate.query.criteria.internal.ParameterRegistry;
import org.hibernate.query.criteria.internal.Renderable;
import org.hibernate.query.criteria.internal.compile.RenderingContext;
import org.hibernate.query.criteria.internal.expression.LiteralExpression;
/**
* Models the ANSI SQL SUBSTRING function.
*
* @author Steve Ebersole
*/
public class SubstringFunction
extends BasicFunctionExpression
implements Serializable {
public static final String NAME = "substring";
private final Expression value;
private final Expression start;
private final Expression length;
public SubstringFunction(
CriteriaBuilderImpl criteriaBuilder,
Expression value,
Expression start,
Expression length) {
super( criteriaBuilder, String.class, NAME );
this.value = value;
this.start = start;
this.length = length;
}
@SuppressWarnings({ "RedundantCast" })
public SubstringFunction(
CriteriaBuilderImpl criteriaBuilder,
Expression value,
Expression start) {
this( criteriaBuilder, value, start, (Expression)null );
}
public SubstringFunction(
CriteriaBuilderImpl criteriaBuilder,
Expression value,
int start) {
this(
criteriaBuilder,
value,
new LiteralExpression( criteriaBuilder, start )
);
}
public SubstringFunction(
CriteriaBuilderImpl criteriaBuilder,
Expression value,
int start,
int length) {
this(
criteriaBuilder,
value,
new LiteralExpression( criteriaBuilder, start ),
new LiteralExpression( criteriaBuilder, length )
);
}
public Expression getLength() {
return length;
}
public Expression getStart() {
return start;
}
public Expression getValue() {
return value;
}
@Override
public void registerParameters(ParameterRegistry registry) {
Helper.possibleParameter( getLength(), registry );
Helper.possibleParameter( getStart(), registry );
Helper.possibleParameter( getValue(), registry );
}
public String render(RenderingContext renderingContext) {
renderingContext.getFunctionStack().push( this );
try {
final StringBuilder buffer = new StringBuilder();
buffer.append( "substring(" )
.append( ( (Renderable) getValue() ).render( renderingContext ) )
.append( ',' )
.append( ( (Renderable) getStart() ).render( renderingContext ) );
if ( getLength() != null ) {
buffer.append( ',' )
.append( ( (Renderable) getLength() ).render( renderingContext ) );
}
return buffer.append( ')' ).toString();
}
finally {
renderingContext.getFunctionStack().pop();
}
}
}