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/*
* 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.CriteriaBuilder.Trimspec;
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 TRIM function.
*
* @author Steve Ebersole
* @author Brett Meyer
*/
public class TrimFunction
extends BasicFunctionExpression
implements Serializable {
public static final String NAME = "trim";
public static final Trimspec DEFAULT_TRIMSPEC = Trimspec.BOTH;
public static final char DEFAULT_TRIM_CHAR = ' ';
private final Trimspec trimspec;
private final Expression trimCharacter;
private final Expression trimSource;
public TrimFunction(
CriteriaBuilderImpl criteriaBuilder,
Trimspec trimspec,
Expression trimCharacter,
Expression trimSource) {
super( criteriaBuilder, String.class, NAME );
this.trimspec = trimspec;
this.trimCharacter = trimCharacter;
this.trimSource = trimSource;
}
public TrimFunction(
CriteriaBuilderImpl criteriaBuilder,
Trimspec trimspec,
char trimCharacter,
Expression trimSource) {
super( criteriaBuilder, String.class, NAME );
this.trimspec = trimspec;
this.trimCharacter = new LiteralExpression( criteriaBuilder, trimCharacter );
this.trimSource = trimSource;
}
public TrimFunction(
CriteriaBuilderImpl criteriaBuilder,
Expression trimSource) {
this( criteriaBuilder, DEFAULT_TRIMSPEC, DEFAULT_TRIM_CHAR, trimSource );
}
public TrimFunction(
CriteriaBuilderImpl criteriaBuilder,
Expression trimCharacter,
Expression trimSource) {
this( criteriaBuilder, DEFAULT_TRIMSPEC, trimCharacter, trimSource );
}
public TrimFunction(
CriteriaBuilderImpl criteriaBuilder,
char trimCharacter,
Expression trimSource) {
this( criteriaBuilder, DEFAULT_TRIMSPEC, trimCharacter, trimSource );
}
public TrimFunction(
CriteriaBuilderImpl criteriaBuilder,
Trimspec trimspec,
Expression trimSource) {
this( criteriaBuilder, trimspec, DEFAULT_TRIM_CHAR, trimSource );
}
public Expression getTrimCharacter() {
return trimCharacter;
}
public Expression getTrimSource() {
return trimSource;
}
public Trimspec getTrimspec() {
return trimspec;
}
@Override
public void registerParameters(ParameterRegistry registry) {
Helper.possibleParameter( getTrimCharacter(), registry );
Helper.possibleParameter( getTrimSource(), registry );
}
@Override
public String render(RenderingContext renderingContext) {
String renderedTrimChar;
if ( trimCharacter.getClass().isAssignableFrom(
LiteralExpression.class ) ) {
// If the character is a literal, treat it as one. A few dialects
// do not support parameters as trim() arguments.
renderedTrimChar = '\'' + ( (LiteralExpression)
trimCharacter ).getLiteral().toString() + '\'';
}
else {
renderedTrimChar = ( (Renderable) trimCharacter ).render(
renderingContext );
}
return new StringBuilder()
.append( "trim(" )
.append( trimspec.name() )
.append( ' ' )
.append( renderedTrimChar )
.append( " from " )
.append( ( (Renderable) trimSource ).render( renderingContext ) )
.append( ')' )
.toString();
}
}