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com.hazelcast.query.impl.PredicateBuilderImpl Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2020, Hazelcast, Inc. All Rights Reserved.
*
* 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.hazelcast.query.impl;
import com.hazelcast.internal.serialization.BinaryInterface;
import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.nio.serialization.DataSerializable;
import com.hazelcast.query.Predicate;
import com.hazelcast.query.PredicateBuilder;
import com.hazelcast.query.PredicateBuilder.EntryObject;
import com.hazelcast.query.Predicates;
import com.hazelcast.query.QueryException;
import com.hazelcast.query.impl.predicates.IndexAwarePredicate;
import com.hazelcast.query.impl.predicates.VisitablePredicate;
import com.hazelcast.query.impl.predicates.Visitor;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import static com.hazelcast.query.QueryConstants.KEY_ATTRIBUTE_NAME;
@BinaryInterface
public class PredicateBuilderImpl
implements PredicateBuilder, EntryObject, IndexAwarePredicate, VisitablePredicate, DataSerializable {
private List lsPredicates = new ArrayList<>();
private String attribute;
@Override
public Predicate accept(Visitor visitor, Indexes indexes) {
Predicate predicate = lsPredicates.get(0);
if (predicate instanceof VisitablePredicate) {
Predicate newPredicate = ((VisitablePredicate) predicate).accept(visitor, indexes);
if (newPredicate != predicate) {
PredicateBuilderImpl newPredicateBuilder = new PredicateBuilderImpl();
newPredicateBuilder.attribute = attribute;
newPredicateBuilder.lsPredicates.addAll(lsPredicates);
newPredicateBuilder.lsPredicates.set(0, newPredicate);
return newPredicateBuilder;
}
}
return this;
}
@Override
public String getAttribute() {
return attribute;
}
@Override
public void setAttribute(String attribute) {
this.attribute = attribute;
}
@Override
public boolean apply(Map.Entry mapEntry) {
return lsPredicates.get(0).apply(mapEntry);
}
@Override
public EntryObject getEntryObject() {
return this;
}
@Override
public PredicateBuilder and(Predicate predicate) {
if (predicate != PredicateBuilderImpl.this) {
throw new QueryException("Illegal and statement expected: "
+ PredicateBuilderImpl.class.getSimpleName() + ", found: "
+ ((predicate == null) ? "null" : predicate.getClass().getSimpleName()));
}
int index = lsPredicates.size() - 2;
Predicate first = lsPredicates.remove(index);
Predicate second = lsPredicates.remove(index);
return addPredicate(Predicates.and(first, second));
}
@Override
public PredicateBuilder or(Predicate predicate) {
if (predicate != PredicateBuilderImpl.this) {
throw new RuntimeException("Illegal or statement expected: "
+ PredicateBuilderImpl.class.getSimpleName() + ", found: "
+ ((predicate == null) ? "null" : predicate.getClass().getSimpleName()));
}
int index = lsPredicates.size() - 2;
Predicate first = lsPredicates.remove(index);
Predicate second = lsPredicates.remove(index);
return addPredicate(Predicates.or(first, second));
}
@Override
public Set filter(QueryContext queryContext) {
Predicate p = lsPredicates.get(0);
if (p instanceof IndexAwarePredicate) {
return ((IndexAwarePredicate) p).filter(queryContext);
}
return null;
}
@Override
public boolean isIndexed(QueryContext queryContext) {
Predicate p = lsPredicates.get(0);
if (p instanceof IndexAwarePredicate) {
return ((IndexAwarePredicate) p).isIndexed(queryContext);
}
return false;
}
@Override
public void writeData(ObjectDataOutput out) throws IOException {
out.writeUTF(attribute);
out.writeInt(lsPredicates.size());
for (Predicate predicate : lsPredicates) {
out.writeObject(predicate);
}
}
@Override
public void readData(ObjectDataInput in) throws IOException {
attribute = in.readUTF();
int size = in.readInt();
lsPredicates = new ArrayList<>(size);
for (int i = 0; i < size; i++) {
addPredicate(in.readObject());
}
}
@Override
public String toString() {
return "PredicateBuilder{\n" + (lsPredicates.size() == 0 ? "" : lsPredicates.get(0)) + "\n}";
}
@Override
public EntryObject get(String attribute) {
if (KEY_ATTRIBUTE_NAME.value().equals(getAttribute())) {
setAttribute(KEY_ATTRIBUTE_NAME.value() + "." + attribute);
} else {
setAttribute(attribute);
}
return this;
}
@Override
public EntryObject key() {
setAttribute(KEY_ATTRIBUTE_NAME.value());
return this;
}
@Override
public PredicateBuilder is(String attribute) {
return addPredicate(Predicates.equal(attribute, true));
}
@Override
public PredicateBuilder isNot(String attribute) {
return addPredicate(Predicates.notEqual(attribute, true));
}
@Override
public PredicateBuilder equal(Comparable value) {
return addPredicate(Predicates.equal(getAttribute(), value));
}
@Override
public PredicateBuilder notEqual(Comparable value) {
return addPredicate(Predicates.notEqual(getAttribute(), value));
}
@Override
public PredicateBuilder isNull() {
return addPredicate(Predicates.equal(getAttribute(), null));
}
@Override
public PredicateBuilder isNotNull() {
return addPredicate(Predicates.notEqual(getAttribute(), null));
}
@Override
public PredicateBuilder greaterThan(Comparable value) {
return addPredicate(Predicates.greaterThan(getAttribute(), value));
}
@Override
public PredicateBuilder greaterEqual(Comparable value) {
return addPredicate(Predicates.greaterEqual(getAttribute(), value));
}
@Override
public PredicateBuilder lessThan(Comparable value) {
return addPredicate(Predicates.lessThan(getAttribute(), value));
}
@Override
public PredicateBuilder lessEqual(Comparable value) {
return addPredicate(Predicates.lessEqual(getAttribute(), value));
}
@Override
public PredicateBuilder between(Comparable from, Comparable to) {
return addPredicate(Predicates.between(getAttribute(), from, to));
}
@Override
public PredicateBuilder in(Comparable... values) {
return addPredicate(Predicates.in(getAttribute(), values));
}
private PredicateBuilder addPredicate(Predicate predicate) {
lsPredicates.add(predicate);
return this;
}
}