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com.hazelcast.query.Predicates Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2013, 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;
import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.nio.serialization.DataSerializable;
import com.hazelcast.nio.serialization.HazelcastSerializationException;
import com.hazelcast.query.impl.AndResultSet;
import com.hazelcast.query.impl.AttributeType;
import com.hazelcast.query.impl.ComparisonType;
import com.hazelcast.query.impl.Index;
import com.hazelcast.query.impl.IndexImpl;
import com.hazelcast.query.impl.OrResultSet;
import com.hazelcast.query.impl.QueryContext;
import com.hazelcast.query.impl.QueryableEntry;
import java.io.IOException;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* A utility class to create {@link com.hazelcast.query.Predicate} instances.
*/
public final class Predicates {
//we don't want instances. private constructor.
private Predicates() {
}
public static Predicate instanceOf(final Class klass) {
return new InstanceOfPredicate(klass);
}
private static Comparable readAttribute(Map.Entry entry, String attribute) {
QueryableEntry queryableEntry = (QueryableEntry) entry;
Comparable value = queryableEntry.getAttribute(attribute);
if (value == null) {
return IndexImpl.NULL;
}
return value;
}
public static Predicate and(Predicate... predicates) {
return new AndPredicate(predicates);
}
public static Predicate not(Predicate predicate) {
return new NotPredicate(predicate);
}
/**
* Or predicate
*
* @param predicates
* @return
*/
public static Predicate or(Predicate... predicates) {
return new OrPredicate(predicates);
}
public static Predicate notEqual(String attribute, Comparable y) {
return new NotEqualPredicate(attribute, y);
}
public static Predicate equal(String attribute, Comparable y) {
return new EqualPredicate(attribute, y);
}
public static Predicate like(String attribute, String pattern) {
return new LikePredicate(attribute, pattern);
}
public static Predicate ilike(String attribute, String pattern) {
return new ILikePredicate(attribute, pattern);
}
public static Predicate regex(String attribute, String pattern) {
return new RegexPredicate(attribute, pattern);
}
public static Predicate greaterThan(String x, Comparable y) {
return new GreaterLessPredicate(x, y, false, false);
}
public static Predicate greaterEqual(String x, Comparable y) {
return new GreaterLessPredicate(x, y, true, false);
}
public static Predicate lessThan(String x, Comparable y) {
return new GreaterLessPredicate(x, y, false, true);
}
public static Predicate lessEqual(String x, Comparable y) {
return new GreaterLessPredicate(x, y, true, true);
}
public static Predicate between(String attribute, Comparable from, Comparable to) {
return new BetweenPredicate(attribute, from, to);
}
public static Predicate in(String attribute, Comparable... values) {
return new InPredicate(attribute, values);
}
/**
* Between Predicate
*/
public static class BetweenPredicate extends AbstractPredicate {
private Comparable to;
private Comparable from;
public BetweenPredicate() {
}
public BetweenPredicate(String first, Comparable from, Comparable to) {
super(first);
if (from == null || to == null) {
throw new NullPointerException("Arguments can't be null");
}
this.from = from;
this.to = to;
}
@Override
public boolean apply(Map.Entry entry) {
Comparable entryValue = readAttribute(entry);
if (entryValue == null) {
return false;
}
Comparable fromConvertedValue = convert(entry, entryValue, from);
Comparable toConvertedValue = convert(entry, entryValue, to);
if (fromConvertedValue == null || toConvertedValue == null) {
return false;
}
return entryValue.compareTo(fromConvertedValue) >= 0 && entryValue.compareTo(toConvertedValue) <= 0;
}
@Override
public Set filter(QueryContext queryContext) {
Index index = getIndex(queryContext);
return index.getSubRecordsBetween(from, to);
}
@Override
public void writeData(ObjectDataOutput out) throws IOException {
super.writeData(out);
out.writeObject(to);
out.writeObject(from);
}
@Override
public void readData(ObjectDataInput in) throws IOException {
super.readData(in);
to = in.readObject();
from = in.readObject();
}
@Override
public String toString() {
return attribute + " BETWEEN " + from + " AND " + to;
}
}
/**
* Not Predicate
*/
public static class NotPredicate implements Predicate, DataSerializable {
private Predicate predicate;
public NotPredicate(Predicate predicate) {
this.predicate = predicate;
}
public NotPredicate() {
}
@Override
public boolean apply(Map.Entry mapEntry) {
return !predicate.apply(mapEntry);
}
@Override
public void writeData(ObjectDataOutput out) throws IOException {
out.writeObject(predicate);
}
@Override
public void readData(ObjectDataInput in) throws IOException {
predicate = in.readObject();
}
@Override
public String toString() {
return "NOT(" + predicate + ")";
}
}
/**
* In Predicate
*/
public static class InPredicate extends AbstractPredicate {
private Comparable[] values;
private volatile Set convertedInValues;
public InPredicate() {
}
public InPredicate(String attribute, Comparable... values) {
super(attribute);
if (values == null) {
throw new NullPointerException("Array can't be null");
}
this.values = values;
}
@Override
public boolean apply(Map.Entry entry) {
Comparable entryValue = readAttribute(entry);
if (entryValue == null) {
return false;
}
Set set = convertedInValues;
if (set == null) {
set = new HashSet(values.length);
for (Comparable value : values) {
set.add(convert(entry, entryValue, value));
}
convertedInValues = set;
}
return set.contains(entryValue);
}
@Override
public Set filter(QueryContext queryContext) {
Index index = getIndex(queryContext);
if (index != null) {
return index.getRecords(values);
} else {
return null;
}
}
@Override
public void writeData(ObjectDataOutput out) throws IOException {
super.writeData(out);
out.writeInt(values.length);
for (Object value : values) {
out.writeObject(value);
}
}
@Override
public void readData(ObjectDataInput in) throws IOException {
super.readData(in);
int len = in.readInt();
values = new Comparable[len];
for (int i = 0; i < len; i++) {
values[i] = in.readObject();
}
}
@Override
public String toString() {
final StringBuilder sb = new StringBuilder();
sb.append(attribute);
sb.append(" IN (");
for (int i = 0; i < values.length; i++) {
if (i > 0) {
sb.append(",");
}
sb.append(values[i]);
}
sb.append(")");
return sb.toString();
}
}
/**
* Regex Predicate
*/
public static class RegexPredicate implements Predicate, DataSerializable {
private String attribute;
private String regex;
private volatile Pattern pattern;
public RegexPredicate() {
}
public RegexPredicate(String attribute, String regex) {
this.attribute = attribute;
this.regex = regex;
}
@Override
public boolean apply(Map.Entry entry) {
Comparable attribute = readAttribute(entry, this.attribute);
String firstVal = attribute == IndexImpl.NULL ? null : (String) attribute;
if (firstVal == null) {
return (regex == null);
} else if (regex == null) {
return false;
} else {
if (pattern == null) {
pattern = Pattern.compile(regex);
}
Matcher m = pattern.matcher(firstVal);
return m.matches();
}
}
@Override
public void writeData(ObjectDataOutput out) throws IOException {
out.writeUTF(attribute);
out.writeUTF(regex);
}
@Override
public void readData(ObjectDataInput in) throws IOException {
attribute = in.readUTF();
regex = in.readUTF();
}
@Override
public String toString() {
return attribute + " REGEX '" + regex + "'";
}
}
/**
* Like Predicate
*/
public static class LikePredicate implements Predicate, DataSerializable {
protected String attribute;
protected String second;
private volatile Pattern pattern;
public LikePredicate() {
}
public LikePredicate(String attribute, String second) {
this.attribute = attribute;
this.second = second;
}
@Override
public boolean apply(Map.Entry entry) {
Comparable attribute = readAttribute(entry, this.attribute);
String firstVal = attribute == IndexImpl.NULL ? null : (String) attribute;
if (firstVal == null) {
return (second == null);
} else if (second == null) {
return false;
} else {
if (pattern == null) {
// we quote the input string then escape then replace % and _
// at the end we have a regex pattern look like : \QSOME_STRING\E.*\QSOME_OTHER_STRING\E
final String quoted = Pattern.quote(second);
String regex = quoted
//escaped %
.replaceAll("(? filter(QueryContext queryContext) {
Set smallestIndexedResult = null;
List> otherIndexedResults = new LinkedList>();
List lsNoIndexPredicates = null;
for (Predicate predicate : predicates) {
boolean indexed = false;
if (predicate instanceof IndexAwarePredicate) {
IndexAwarePredicate iap = (IndexAwarePredicate) predicate;
if (iap.isIndexed(queryContext)) {
indexed = true;
Set s = iap.filter(queryContext);
if (smallestIndexedResult == null) {
smallestIndexedResult = s;
} else if (s.size() < smallestIndexedResult.size()) {
otherIndexedResults.add(smallestIndexedResult);
smallestIndexedResult = s;
} else {
otherIndexedResults.add(s);
}
}
}
if (!indexed) {
if (lsNoIndexPredicates == null) {
lsNoIndexPredicates = new LinkedList();
}
lsNoIndexPredicates.add(predicate);
}
}
if (smallestIndexedResult == null) {
return null;
}
return new AndResultSet(smallestIndexedResult, otherIndexedResults, lsNoIndexPredicates);
}
@Override
public boolean isIndexed(QueryContext queryContext) {
for (Predicate predicate : predicates) {
if (predicate instanceof IndexAwarePredicate) {
IndexAwarePredicate iap = (IndexAwarePredicate) predicate;
if (iap.isIndexed(queryContext)) {
return true;
}
}
}
return false;
}
@Override
public boolean apply(Map.Entry mapEntry) {
for (Predicate predicate : predicates) {
if (!predicate.apply(mapEntry)) {
return false;
}
}
return true;
}
@Override
public String toString() {
final StringBuilder sb = new StringBuilder();
sb.append("(");
int size = predicates.length;
for (int i = 0; i < size; i++) {
if (i > 0) {
sb.append(" AND ");
}
sb.append(predicates[i]);
}
sb.append(")");
return sb.toString();
}
@Override
public void writeData(ObjectDataOutput out) throws IOException {
out.writeInt(predicates.length);
for (Predicate predicate : predicates) {
out.writeObject(predicate);
}
}
@Override
public void readData(ObjectDataInput in) throws IOException {
int size = in.readInt();
predicates = new Predicate[size];
for (int i = 0; i < size; i++) {
predicates[i] = in.readObject();
}
}
}
/**
* Or Predicate
*/
public static class OrPredicate implements IndexAwarePredicate, DataSerializable {
private Predicate[] predicates;
public OrPredicate() {
}
public OrPredicate(Predicate... predicates) {
this.predicates = predicates;
}
@Override
public Set filter(QueryContext queryContext) {
List> indexedResults = new LinkedList>();
for (Predicate predicate : predicates) {
if (predicate instanceof IndexAwarePredicate) {
IndexAwarePredicate iap = (IndexAwarePredicate) predicate;
if (iap.isIndexed(queryContext)) {
Set s = iap.filter(queryContext);
if (s != null) {
indexedResults.add(s);
}
} else {
return null;
}
}
}
return indexedResults.isEmpty() ? null : new OrResultSet(indexedResults);
}
@Override
public boolean isIndexed(QueryContext queryContext) {
for (Predicate predicate : predicates) {
if (predicate instanceof IndexAwarePredicate) {
IndexAwarePredicate iap = (IndexAwarePredicate) predicate;
if (!iap.isIndexed(queryContext)) {
return false;
}
} else {
return false;
}
}
return true;
}
@Override
public boolean apply(Map.Entry mapEntry) {
for (Predicate predicate : predicates) {
if (predicate.apply(mapEntry)) {
return true;
}
}
return false;
}
@Override
public void writeData(ObjectDataOutput out) throws IOException {
out.writeInt(predicates.length);
for (Predicate predicate : predicates) {
out.writeObject(predicate);
}
}
@Override
public void readData(ObjectDataInput in) throws IOException {
int size = in.readInt();
predicates = new Predicate[size];
for (int i = 0; i < size; i++) {
predicates[i] = in.readObject();
}
}
@Override
public String toString() {
final StringBuilder sb = new StringBuilder();
sb.append("(");
int size = predicates.length;
for (int i = 0; i < size; i++) {
if (i > 0) {
sb.append(" OR ");
}
sb.append(predicates[i]);
}
sb.append(")");
return sb.toString();
}
}
/**
* Greater Less Predicate
*/
public static class GreaterLessPredicate extends EqualPredicate {
boolean equal;
boolean less;
public GreaterLessPredicate() {
}
public GreaterLessPredicate(String attribute, Comparable value, boolean equal, boolean less) {
super(attribute);
if (value == null) {
throw new NullPointerException("Arguments can't be null");
}
this.value = value;
this.equal = equal;
this.less = less;
}
@Override
public boolean apply(Map.Entry mapEntry) {
final Comparable entryValue = readAttribute(mapEntry);
if (entryValue == null) {
return false;
}
final Comparable attributeValue = convert(mapEntry, entryValue, value);
final int result = entryValue.compareTo(attributeValue);
return equal && result == 0 || (less ? (result < 0) : (result > 0));
}
@Override
public Set filter(QueryContext queryContext) {
Index index = getIndex(queryContext);
final ComparisonType comparisonType;
if (less) {
comparisonType = equal ? ComparisonType.LESSER_EQUAL : ComparisonType.LESSER;
} else {
comparisonType = equal ? ComparisonType.GREATER_EQUAL : ComparisonType.GREATER;
}
return index.getSubRecords(comparisonType, value);
}
@Override
public void readData(ObjectDataInput in) throws IOException {
super.readData(in);
equal = in.readBoolean();
less = in.readBoolean();
}
@Override
public void writeData(ObjectDataOutput out) throws IOException {
super.writeData(out);
out.writeBoolean(equal);
out.writeBoolean(less);
}
@Override
public String toString() {
final StringBuilder sb = new StringBuilder();
sb.append(attribute);
sb.append(less ? "<" : ">");
if (equal) {
sb.append("=");
}
sb.append(value);
return sb.toString();
}
}
/**
* Not Equal Predicate
*/
public static class NotEqualPredicate extends EqualPredicate {
public NotEqualPredicate() {
}
public NotEqualPredicate(String attribute, Comparable value) {
super(attribute, value);
}
@Override
public boolean apply(Map.Entry entry) {
return !super.apply(entry);
}
@Override
public Set filter(QueryContext queryContext) {
Index index = getIndex(queryContext);
if (index != null) {
return index.getSubRecords(ComparisonType.NOT_EQUAL, value);
} else {
return null;
}
}
@Override
public String toString() {
return attribute + " != " + value;
}
}
/**
* Equal Predicate
*/
public static class EqualPredicate extends AbstractPredicate {
protected Comparable value;
public EqualPredicate() {
}
public EqualPredicate(String attribute) {
super(attribute);
}
public EqualPredicate(String attribute, Comparable value) {
super(attribute);
this.value = value;
}
@Override
public Set filter(QueryContext queryContext) {
Index index = getIndex(queryContext);
return index.getRecords(value);
}
@Override
public boolean apply(Map.Entry mapEntry) {
Comparable entryValue = readAttribute(mapEntry);
if (entryValue == null) {
return value == null || value == IndexImpl.NULL;
}
value = convert(mapEntry, entryValue, value);
return entryValue.equals(value);
}
@Override
public void writeData(ObjectDataOutput out) throws IOException {
super.writeData(out);
out.writeObject(value);
}
@Override
public void readData(ObjectDataInput in) throws IOException {
super.readData(in);
value = in.readObject();
}
@Override
public String toString() {
return attribute + "=" + value;
}
}
/**
* Provides some functionality for some predicates
* such as Between, In.
*/
public abstract static class AbstractPredicate implements IndexAwarePredicate, DataSerializable {
protected String attribute;
private transient volatile AttributeType attributeType;
protected AbstractPredicate() {
}
protected AbstractPredicate(String attribute) {
this.attribute = attribute;
}
protected Comparable convert(Map.Entry mapEntry, Comparable entryValue, Comparable attributeValue) {
if (attributeValue == null) {
return null;
}
if (attributeValue instanceof IndexImpl.NullObject) {
return IndexImpl.NULL;
}
AttributeType type = attributeType;
if (type == null) {
QueryableEntry queryableEntry = (QueryableEntry) mapEntry;
type = queryableEntry.getAttributeType(attribute);
attributeType = type;
}
if (type == AttributeType.ENUM) {
// if attribute type is enum, convert given attribute to enum string
return type.getConverter().convert(attributeValue);
} else {
// if given attribute value is already in expected type then there's no need for conversion.
if (entryValue != null && entryValue.getClass().isAssignableFrom(attributeValue.getClass())) {
return attributeValue;
} else if (type != null) {
return type.getConverter().convert(attributeValue);
} else {
throw new QueryException("Unknown attribute type: " + attributeValue.getClass());
}
}
}
@Override
public boolean isIndexed(QueryContext queryContext) {
return getIndex(queryContext) != null;
}
protected Index getIndex(QueryContext queryContext) {
return queryContext.getIndex(attribute);
}
protected Comparable readAttribute(Map.Entry entry) {
QueryableEntry queryableEntry = (QueryableEntry) entry;
Comparable val = queryableEntry.getAttribute(attribute);
if (val != null && val.getClass().isEnum()) {
val = val.toString();
}
return val;
}
@Override
public void writeData(ObjectDataOutput out) throws IOException {
out.writeUTF(attribute);
}
@Override
public void readData(ObjectDataInput in) throws IOException {
attribute = in.readUTF();
}
}
private static class InstanceOfPredicate implements Predicate, DataSerializable {
private Class klass;
public InstanceOfPredicate(Class klass) {
this.klass = klass;
}
@Override
public boolean apply(Map.Entry mapEntry) {
Object value = mapEntry.getValue();
if (value == null) {
return false;
}
return klass.isAssignableFrom(value.getClass());
}
@Override
public void writeData(ObjectDataOutput out) throws IOException {
out.writeUTF(klass.getName());
}
@Override
public void readData(ObjectDataInput in) throws IOException {
String klassName = in.readUTF();
try {
klass = in.getClassLoader().loadClass(klassName);
} catch (ClassNotFoundException e) {
throw new HazelcastSerializationException("Failed to load class: " + klass, e);
}
}
@Override
public String toString() {
return " instanceOf (" + klass.getName() + ")";
}
}
}
