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/*
* Copyright 2014 - 2020 Blazebit.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.blazebit.persistence.criteria.impl.expression;
import com.blazebit.persistence.criteria.impl.BlazeCriteriaBuilderImpl;
import com.blazebit.persistence.criteria.impl.ParameterVisitor;
import com.blazebit.persistence.criteria.impl.RenderContext;
import javax.persistence.criteria.Expression;
import java.math.BigDecimal;
import java.math.BigInteger;
/**
* @author Christian Beikov
* @since 1.2.0
*/
public class BinaryArithmeticExpression extends AbstractExpression {
private static final long serialVersionUID = 1L;
/**
* @author Christian Beikov
* @since 1.2.0
*/
public static enum Operation {
ADD {
public void render(RenderContext context, Expression leftHandSide, Expression rightHandSide) {
simple(context, leftHandSide, '+', rightHandSide);
}
},
SUBTRACT {
public void render(RenderContext context, Expression leftHandSide, Expression rightHandSide) {
simple(context, leftHandSide, '-', rightHandSide);
}
},
MULTIPLY {
public void render(RenderContext context, Expression leftHandSide, Expression rightHandSide) {
simple(context, leftHandSide, '*', rightHandSide);
}
},
DIVIDE {
public void render(RenderContext context, Expression leftHandSide, Expression rightHandSide) {
simple(context, leftHandSide, '/', rightHandSide);
}
},
MOD {
public void render(RenderContext context, Expression leftHandSide, Expression rightHandSide) {
context.getBuffer().append("MOD(");
context.apply(leftHandSide);
context.getBuffer().append(',');
context.apply(rightHandSide);
context.getBuffer().append(')');
}
};
public abstract void render(RenderContext context, Expression leftHandSide, Expression rightHandSide);
private static void simple(RenderContext context, Expression leftHandSide, char operator, Expression rightHandSide) {
context.getBuffer().append('(');
context.apply(leftHandSide);
context.getBuffer().append(operator);
context.apply(rightHandSide);
context.getBuffer().append(')');
}
}
private final Operation operator;
private final Expression rightHandSide;
private final Expression leftHandSide;
public BinaryArithmeticExpression(BlazeCriteriaBuilderImpl criteriaBuilder, Class resultType, Operation operator, Expression leftHandSide, Expression rightHandSide) {
super(criteriaBuilder, resultType);
this.operator = operator;
this.leftHandSide = leftHandSide;
this.rightHandSide = rightHandSide;
}
public BinaryArithmeticExpression(BlazeCriteriaBuilderImpl criteriaBuilder, Class javaType, Operation operator, Expression leftHandSide, N rightHandSide) {
super(criteriaBuilder, javaType);
this.operator = operator;
this.leftHandSide = leftHandSide;
this.rightHandSide = new LiteralExpression(criteriaBuilder, rightHandSide);
}
public BinaryArithmeticExpression(BlazeCriteriaBuilderImpl criteriaBuilder, Class javaType, Operation operator, N leftHandSide, Expression rightHandSide) {
super(criteriaBuilder, javaType);
this.operator = operator;
this.leftHandSide = new LiteralExpression(criteriaBuilder, leftHandSide);
this.rightHandSide = rightHandSide;
}
public static Class determineResultType(Class argument1Type, Class argument2Type) {
return determineResultType(argument1Type, argument2Type, false);
}
@SuppressWarnings("unchecked")
public static Class determineResultType(Class argument1Type, Class argument2Type, boolean isQuotientOperation) {
if (isQuotientOperation) {
return Number.class;
}
return determineResultType(new Class[]{argument1Type, argument2Type});
}
/**
* Apply rules from "6.5.7.1 Result Types of Expressions" of the JPA spec.
*/
public static Class determineResultType(Class... types) {
Class result = Number.class;
for (Class type : types) {
if (Double.class.equals(type)) {
result = Double.class;
} else if (Float.class.equals(type)) {
result = Float.class;
} else if (BigDecimal.class.equals(type)) {
result = BigDecimal.class;
} else if (BigInteger.class.equals(type)) {
result = BigInteger.class;
} else if (Long.class.equals(type)) {
result = Long.class;
} else if (isIntegralType(type)) {
result = Integer.class;
}
}
return result;
}
private static boolean isIntegralType(Class type) {
return Integer.class.equals(type) || Short.class.equals(type);
}
@Override
public void visitParameters(ParameterVisitor visitor) {
visitor.visit(leftHandSide);
visitor.visit(rightHandSide);
}
@Override
public void render(RenderContext context) {
operator.render(context, leftHandSide, rightHandSide);
}
}
