com.blazebit.persistence.criteria.impl.expression.ComparisonPredicate Maven / Gradle / Ivy
/*
* 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 com.blazebit.persistence.parser.util.TypeUtils;
import javax.persistence.criteria.Expression;
/**
* @author Christian Beikov
* @since 1.2.0
*/
public class ComparisonPredicate extends AbstractSimplePredicate {
private static final long serialVersionUID = 1L;
private final ComparisonOperator comparisonOperator;
private final Expression leftHandSide;
private final Expression rightHandSide;
public ComparisonPredicate(BlazeCriteriaBuilderImpl criteriaBuilder, ComparisonOperator comparisonOperator, Expression leftHandSide, Expression rightHandSide) {
super(criteriaBuilder, false);
this.comparisonOperator = comparisonOperator;
this.leftHandSide = leftHandSide;
this.rightHandSide = rightHandSide;
}
@SuppressWarnings({"unchecked", "rawtypes"})
public ComparisonPredicate(BlazeCriteriaBuilderImpl criteriaBuilder, ComparisonOperator comparisonOperator, Expression leftHandSide, Object rightHandSide) {
super(criteriaBuilder, false);
this.comparisonOperator = comparisonOperator;
this.leftHandSide = leftHandSide;
if (TypeUtils.isNumeric(leftHandSide.getJavaType())) {
this.rightHandSide = new LiteralExpression(criteriaBuilder, TypeUtils.convert(rightHandSide, (Class) leftHandSide.getJavaType(), criteriaBuilder.getEntityMetamodel().getEnumTypes().keySet()));
} else {
this.rightHandSide = new LiteralExpression(criteriaBuilder, rightHandSide);
}
}
@SuppressWarnings({"unchecked", "rawtypes"})
public ComparisonPredicate(BlazeCriteriaBuilderImpl criteriaBuilder, ComparisonOperator comparisonOperator, Expression leftHandSide, Number rightHandSide) {
super(criteriaBuilder, false);
this.comparisonOperator = comparisonOperator;
this.leftHandSide = leftHandSide;
Class type = leftHandSide.getJavaType();
if (Number.class.equals(type)) {
this.rightHandSide = new LiteralExpression(criteriaBuilder, rightHandSide);
} else {
N converted = (N) TypeUtils.convert(rightHandSide, type, criteriaBuilder.getEntityMetamodel().getEnumTypes().keySet());
this.rightHandSide = new LiteralExpression(criteriaBuilder, converted);
}
}
/**
* @author Christian Beikov
* @since 1.2.0
*/
public static enum ComparisonOperator {
EQUAL {
public String getOperator() {
return "=";
}
public ComparisonOperator getNegated() {
return NOT_EQUAL;
}
},
NOT_EQUAL {
public String getOperator() {
return "<>";
}
public ComparisonOperator getNegated() {
return EQUAL;
}
},
LESS_THAN {
public String getOperator() {
return "<";
}
public ComparisonOperator getNegated() {
return GREATER_THAN_OR_EQUAL;
}
},
LESS_THAN_OR_EQUAL {
public String getOperator() {
return "<=";
}
public ComparisonOperator getNegated() {
return GREATER_THAN;
}
},
GREATER_THAN {
public String getOperator() {
return ">";
}
public ComparisonOperator getNegated() {
return LESS_THAN_OR_EQUAL;
}
},
GREATER_THAN_OR_EQUAL {
public String getOperator() {
return ">=";
}
public ComparisonOperator getNegated() {
return LESS_THAN;
}
};
public abstract String getOperator();
public abstract ComparisonOperator getNegated();
}
@Override
public AbstractPredicate copyNegated() {
return new ComparisonPredicate(criteriaBuilder, comparisonOperator.getNegated(), leftHandSide, rightHandSide);
}
@Override
public void visitParameters(ParameterVisitor visitor) {
visitor.visit(leftHandSide);
visitor.visit(rightHandSide);
}
@Override
public void render(RenderContext context) {
context.apply(leftHandSide);
context.getBuffer().append(comparisonOperator.getOperator());
context.apply(rightHandSide);
}
}