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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;
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.predicate.ImplicitNumericExpressionTypeDeterminer;
/**
* Models standard arithmetc operations with two operands.
*
* @author Steve Ebersole
*/
public class BinaryArithmeticOperation
extends ExpressionImpl
implements BinaryOperatorExpression, Serializable {
public static enum Operation {
ADD {
@Override
String apply(String lhs, String rhs) {
return applyPrimitive( lhs, '+', rhs );
}
},
SUBTRACT {
@Override
String apply(String lhs, String rhs) {
return applyPrimitive( lhs, '-', rhs );
}
},
MULTIPLY {
@Override
String apply(String lhs, String rhs) {
return applyPrimitive( lhs, '*', rhs );
}
},
DIVIDE {
@Override
String apply(String lhs, String rhs) {
return applyPrimitive( lhs, '/', rhs );
}
},
QUOT {
@Override
String apply(String lhs, String rhs) {
return applyPrimitive( lhs, '/', rhs );
}
},
MOD {
@Override
String apply(String lhs, String rhs) {
// return lhs + " % " + rhs;
return "mod(" + lhs + "," + rhs + ")";
}
};
abstract String apply(String lhs, String rhs);
private static final char LEFT_PAREN = '(';
private static final char RIGHT_PAREN = ')';
private static String applyPrimitive(String lhs, char operator, String rhs) {
return String.valueOf( LEFT_PAREN ) + lhs + operator + rhs + RIGHT_PAREN;
}
}
private final Operation operator;
private final Expression rhs;
private final Expression lhs;
public static Class determineResultType(
Class argument1Type,
Class argument2Type
) {
return determineResultType( argument1Type, argument2Type, false );
}
public static Class determineResultType(
Class argument1Type,
Class argument2Type,
boolean isQuotientOperation) {
if ( isQuotientOperation ) {
return Number.class;
}
return ImplicitNumericExpressionTypeDeterminer.determineResultType( argument1Type, argument2Type );
}
/**
* Helper for determining the appropriate operation return type based on one of the operands as an expression.
*
* @param defaultType The default return type to use if we cannot determine the java type of 'expression' operand.
* @param expression The operand.
*
* @return The appropriate return type.
*/
public static Class determineReturnType(
Class defaultType,
Expression expression) {
return expression == null || expression.getJavaType() == null
? defaultType
: expression.getJavaType();
}
/**
* Helper for determining the appropriate operation return type based on one of the operands as a literal.
*
* @param defaultType The default return type to use if we cannot determine the java type of 'numberLiteral' operand.
* @param numberLiteral The operand.
*
* @return The appropriate return type.
*/
public static Class determineReturnType(
Class defaultType,
Number numberLiteral) {
return numberLiteral == null ? defaultType : numberLiteral.getClass();
}
/**
* Creates an arithmethic operation based on 2 expressions.
*
* @param criteriaBuilder The builder for query components.
* @param resultType The operation result type
* @param operator The operator (type of operation).
* @param lhs The left-hand operand.
* @param rhs The right-hand operand
*/
public BinaryArithmeticOperation(
CriteriaBuilderImpl criteriaBuilder,
Class resultType,
Operation operator,
Expression lhs,
Expression rhs) {
super( criteriaBuilder, resultType );
this.operator = operator;
this.lhs = lhs;
this.rhs = rhs;
}
/**
* Creates an arithmethic operation based on an expression and a literal.
*
* @param criteriaBuilder The builder for query components.
* @param javaType The operation result type
* @param operator The operator (type of operation).
* @param lhs The left-hand operand
* @param rhs The right-hand operand (the literal)
*/
public BinaryArithmeticOperation(
CriteriaBuilderImpl criteriaBuilder,
Class javaType,
Operation operator,
Expression lhs,
N rhs) {
super( criteriaBuilder, javaType );
this.operator = operator;
this.lhs = lhs;
this.rhs = new LiteralExpression( criteriaBuilder, rhs );
}
/**
* Creates an arithmetic operation based on an expression and a literal.
*
* @param criteriaBuilder The builder for query components.
* @param javaType The operation result type
* @param operator The operator (type of operation).
* @param lhs The left-hand operand (the literal)
* @param rhs The right-hand operand
*/
public BinaryArithmeticOperation(
CriteriaBuilderImpl criteriaBuilder,
Class javaType,
Operation operator,
N lhs,
Expression rhs) {
super( criteriaBuilder, javaType );
this.operator = operator;
this.lhs = new LiteralExpression( criteriaBuilder, lhs );
this.rhs = rhs;
}
public Operation getOperator() {
return operator;
}
@Override
public Expression getRightHandOperand() {
return rhs;
}
@Override
public Expression getLeftHandOperand() {
return lhs;
}
@Override
public void registerParameters(ParameterRegistry registry) {
Helper.possibleParameter( getRightHandOperand(), registry );
Helper.possibleParameter( getLeftHandOperand(), registry );
}
@Override
public String render(RenderingContext renderingContext) {
return getOperator().apply(
( (Renderable) getLeftHandOperand() ).render( renderingContext ),
( (Renderable) getRightHandOperand() ).render( renderingContext )
);
}
}