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ParameterPredicateVisitor.java
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ParameterPredicateVisitor.java
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/*
* Copyright (c) 2017 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.ditto.rql.query.filter;
import static org.eclipse.ditto.base.model.common.ConditionChecker.checkNotNull;
import java.util.ArrayList;
import java.util.Collections;
import java.util.EnumMap;
import java.util.List;
import java.util.Map;
import java.util.function.BiFunction;
import javax.annotation.Nullable;
import org.eclipse.ditto.rql.model.predicates.ast.ExistsNode;
import org.eclipse.ditto.rql.model.predicates.ast.LogicalNode;
import org.eclipse.ditto.rql.model.predicates.ast.MultiComparisonNode;
import org.eclipse.ditto.rql.model.predicates.ast.Node;
import org.eclipse.ditto.rql.model.predicates.ast.PredicateVisitor;
import org.eclipse.ditto.rql.model.predicates.ast.RootNode;
import org.eclipse.ditto.rql.model.predicates.ast.SingleComparisonNode;
import org.eclipse.ditto.rql.query.criteria.Criteria;
import org.eclipse.ditto.rql.query.criteria.CriteriaFactory;
import org.eclipse.ditto.rql.query.criteria.Predicate;
import org.eclipse.ditto.rql.query.expression.ExistsFieldExpression;
import org.eclipse.ditto.rql.query.expression.FieldExpressionFactory;
import org.eclipse.ditto.rql.query.expression.FilterFieldExpression;
/**
* Predicate AST PredicateVisitor. Implements the visitor for AST nodes and creates a search criteria out of it.
*/
final class ParameterPredicateVisitor implements PredicateVisitor {
private static final Map<SingleComparisonNode.Type, BiFunction<CriteriaFactory, Object, Predicate>>
SINGLE_COMPARISON_NODE_MAPPING;
static {
SINGLE_COMPARISON_NODE_MAPPING = new EnumMap<>(SingleComparisonNode.Type.class);
SINGLE_COMPARISON_NODE_MAPPING.put(SingleComparisonNode.Type.EQ, CriteriaFactory::eq);
SINGLE_COMPARISON_NODE_MAPPING.put(SingleComparisonNode.Type.NE, CriteriaFactory::ne);
SINGLE_COMPARISON_NODE_MAPPING.put(SingleComparisonNode.Type.GT, CriteriaFactory::gt);
SINGLE_COMPARISON_NODE_MAPPING.put(SingleComparisonNode.Type.GE, CriteriaFactory::ge);
SINGLE_COMPARISON_NODE_MAPPING.put(SingleComparisonNode.Type.LT, CriteriaFactory::lt);
SINGLE_COMPARISON_NODE_MAPPING.put(SingleComparisonNode.Type.LE, CriteriaFactory::le);
SINGLE_COMPARISON_NODE_MAPPING.put(SingleComparisonNode.Type.LIKE, CriteriaFactory::like);
SINGLE_COMPARISON_NODE_MAPPING.put(SingleComparisonNode.Type.ILIKE, CriteriaFactory::ilike);
}
private final List<Criteria> criteria = new ArrayList<>();
private final CriteriaFactory criteriaFactory;
private final FieldExpressionFactory fieldExprFactory;
/**
* Constructs a new {@code ParameterPredicateVisitor} object.
*
* @param criteriaFactory the factory to create the search criteria.
* @param fieldExprFactory the factory to create field expressions.
* @throws NullPointerException if any argument is {@code null}.
*/
ParameterPredicateVisitor(final CriteriaFactory criteriaFactory, final FieldExpressionFactory fieldExprFactory) {
this.criteriaFactory = checkNotNull(criteriaFactory, "criteria factory");
this.fieldExprFactory = checkNotNull(fieldExprFactory, "field expression factory");
}
/**
* Retrieve all search criteria of this visitor.
*
* @return the criteria.
*/
public List<Criteria> getCriteria() {
return criteria;
}
@Override
public void visit(final RootNode node) {
node.getChildren().forEach(child -> child.accept(this));
}
@Override
public void visit(final LogicalNode node) {
checkNotNull(node, "logical node");
final LogicalNode.Type type = node.getType();
final ParameterPredicateVisitor childVisitor = new ParameterPredicateVisitor(criteriaFactory, fieldExprFactory);
node.getChildren().forEach(child -> child.accept(childVisitor));
switch (type) {
case AND:
criteria.add(criteriaFactory.and(childVisitor.getCriteria()));
break;
case OR:
criteria.add(criteriaFactory.or(childVisitor.getCriteria()));
break;
case NOT:
criteria.add(criteriaFactory.nor(childVisitor.getCriteria()));
break;
default:
throwUnknownType(type);
}
}
private static void throwUnknownType(final Object type) {
throw new IllegalStateException("Unknown type: " + type);
}
@Override
public void visit(final SingleComparisonNode node) {
checkNotNull(node, "single comparison node");
final FilterFieldExpression field = fieldExprFactory.filterBy(node.getComparisonProperty());
final SingleComparisonNode.Type type = node.getComparisonType();
@Nullable final Object value = node.getComparisonValue();
final BiFunction<CriteriaFactory, Object, Predicate> predicateFactory = SINGLE_COMPARISON_NODE_MAPPING.get(type);
if (predicateFactory == null) {
throwUnknownType(type);
}
final Predicate predicate = predicateFactory.apply(criteriaFactory, value);
criteria.add(criteriaFactory.fieldCriteria(field, predicate));
}
@Override
public void visit(final MultiComparisonNode node) {
checkNotNull(node, "multi comparison node");
final FilterFieldExpression field = fieldExprFactory.filterBy(node.getComparisonProperty());
final MultiComparisonNode.Type type = node.getComparisonType();
final List<Object> values = node.getComparisonValue() != null ? node.getComparisonValue() :
Collections.emptyList();
if (type == MultiComparisonNode.Type.IN) {
criteria.add(criteriaFactory.fieldCriteria(field, criteriaFactory.in(values)));
} else {
throwUnknownType(type);
}
}
@Override
public void visit(final ExistsNode node) {
checkNotNull(node, "exists node");
final ExistsFieldExpression field = fieldExprFactory.existsBy(node.getProperty());
criteria.add(criteriaFactory.existsCriteria(field));
}
@Override
public void visit(final Node node) {
// Do nothing, the other cases are handled by the more specific visit methods.
}
}