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stratio deep common utility classes
/*
* Copyright 2014, Stratio.
*
* 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.stratio.deep.entity;
import com.datastax.driver.core.DataType;
import com.google.common.collect.ImmutableMap;
import com.stratio.deep.annotations.DeepField;
import com.stratio.deep.exception.DeepGenericException;
import com.stratio.deep.exception.DeepInstantiationException;
import com.stratio.deep.utils.AnnotationUtils;
import org.apache.cassandra.cql3.CQL3Type;
import org.apache.cassandra.db.marshal.*;
import org.apache.commons.collections.CollectionUtils;
import java.io.Serializable;
import java.lang.reflect.Field;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.net.Inet4Address;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.util.*;
import static com.stratio.deep.utils.Utils.marshallerInstance;
import static java.lang.Class.forName;
import static java.util.Arrays.asList;
import static java.util.Collections.unmodifiableCollection;
/**
* Defines a serializable CellValidator.
*
* This object wraps the complexity of obtaining the Cassandra's AbstractType
* associated to a {@link com.stratio.deep.entity.Cell}.
*
* In the case of collection types, a simple cassandra marshaller qualified name
* is not enough to fully generate an AbstractType, we also need the type(s) the
* collection holds.
*/
public class CellValidator implements Serializable {
private static final String DEFAULT_VALIDATOR_CLASSNAME = "org.apache.cassandra.db.marshal.UTF8Type";
private static final Map MAP_JAVA_TYPE_TO_CQL_TYPE =
ImmutableMap.builder()
.put(String.class, CQL3Type.Native.TEXT)
.put(Integer.class, CQL3Type.Native.INT)
.put(Boolean.class, CQL3Type.Native.BOOLEAN)
.put(Date.class, CQL3Type.Native.TIMESTAMP)
.put(BigDecimal.class, CQL3Type.Native.DECIMAL)
.put(Long.class, CQL3Type.Native.BIGINT)
.put(Double.class, CQL3Type.Native.DOUBLE)
.put(Float.class, CQL3Type.Native.FLOAT)
.put(InetAddress.class, CQL3Type.Native.INET)
.put(Inet4Address.class, CQL3Type.Native.INET)
.put(Inet6Address.class, CQL3Type.Native.INET)
.put(BigInteger.class, CQL3Type.Native.VARINT)
.put(UUID.class, CQL3Type.Native.UUID)
.build();
private static final Map MAP_JAVA_TYPE_TO_DATA_TYPE_NAME =
ImmutableMap.builder()
.put(UTF8Type.class.getCanonicalName(), DataType.Name.TEXT)
.put(Int32Type.class.getCanonicalName(), DataType.Name.INT)
.put(BooleanType.class.getCanonicalName(), DataType.Name.BOOLEAN)
.put(TimestampType.class.getCanonicalName(), DataType.Name.TIMESTAMP)
.put(DateType.class.getCanonicalName(), DataType.Name.TIMESTAMP)
.put(DecimalType.class.getCanonicalName(), DataType.Name.DECIMAL)
.put(LongType.class.getCanonicalName(), DataType.Name.BIGINT)
.put(DoubleType.class.getCanonicalName(), DataType.Name.DOUBLE)
.put(FloatType.class.getCanonicalName(), DataType.Name.FLOAT)
.put(InetAddressType.class.getCanonicalName(), DataType.Name.INET)
.put(IntegerType.class.getCanonicalName(), DataType.Name.VARINT)
.put(UUIDType.class.getCanonicalName(), DataType.Name.UUID)
.put(TimeUUIDType.class.getCanonicalName(), DataType.Name.TIMEUUID)
.put(MapType.class.getCanonicalName(), DataType.Name.MAP)
.put(SetType.class.getCanonicalName(), DataType.Name.SET)
.put(ListType.class.getCanonicalName(), DataType.Name.LIST)
.put(BytesType.class.getCanonicalName(), DataType.Name.BLOB)
.build();
/**
* Possible types of CellValidator.
*/
public static enum Kind {
MAP, SET, LIST, NOT_A_COLLECTION;
/**
* Returns the Kind associated to the provided Cassandra validator class.
*
*
* To be more specific, returns:
*
* - NOT_A_COLLECTION: when the provided type is not a set a list or a map
* - MAP: when the provided validator is MapType.class
* - LIST: when the provided validator is ListType.class
* - SET: when the provided validator is SetType.class
*
*
*
* @param type the marshaller Class object.
* @return the Kind associated to the provided marhaller Class object.
*/
public static Kind validatorClassToKind(Class type) {
if (type == null) {
return NOT_A_COLLECTION;
}
if (type.equals(SetType.class)) {
return SET;
} else if (type.equals(ListType.class)) {
return LIST;
} else if (type.equals(MapType.class)) {
return MAP;
} else {
return NOT_A_COLLECTION;
}
}
/**
* Returns the Kind associated to the provided object instance.
*
* To be more specific, returns:
*
* - {@link com.stratio.deep.entity.CellValidator.Kind#SET}: when the provided instance object is an
* instance of {@link java.util.Set}
* - {@link com.stratio.deep.entity.CellValidator.Kind#LIST}: when the provided instance object is an
* instance of {@link java.util.List}
* - {@link com.stratio.deep.entity.CellValidator.Kind#MAP}: when the provided instance object is an
* instance of {@link java.util.Map}
* - {@link com.stratio.deep.entity.CellValidator.Kind#NOT_A_COLLECTION}: otherwise.
*
*
*
* @param object an object instance.
* @param the generic type of the provided object instance.
* @return the Kind associated to the provided object.
*/
public static Kind objectToKind(T object) {
if (object == null) {
return NOT_A_COLLECTION;
}
Kind res;
if (Set.class.isAssignableFrom(object.getClass())) {
res = SET;
} else if (List.class.isAssignableFrom(object.getClass())) {
res = LIST;
} else if (Map.class.isAssignableFrom(object.getClass())) {
res = MAP;
} else {
res = NOT_A_COLLECTION;
}
return res;
}
}
/**
* Cassandra's validatorClassName class name for the current cell.
* The provided type must extends {@link org.apache.cassandra.db.marshal.AbstractType}
*/
private String validatorClassName = DEFAULT_VALIDATOR_CLASSNAME;
/**
* Only applies to collection types (validatorKind != Kind.NOT_A_COLLECTION), contains the list of
* types the collection holds. At most, this collection will contain two elements, in the case
* of validatorKind == Kind.MAP.
*/
private Collection validatorTypes;
/**
* Holds the type of the current validator.
*/
private Kind validatorKind = Kind.NOT_A_COLLECTION;
private transient AbstractType abstractType;
private DataType.Name cqlTypeName;
/**
* Factory method that builds a CellValidator from an IDeepType field.
*
* @param field the IDeepType field.
* @return a new CellValidator associated to the provided object.
*/
public static CellValidator cellValidator(Field field) {
return new CellValidator(field);
}
/**
* Factory method that builds a CellValidator from a DataType object.
*
* @param type the data type coming from the driver.
* @return a new CellValidator associated to the provided object.
*/
public static CellValidator cellValidator(DataType type) {
return new CellValidator(type);
}
/**
* Generates a CellValidator for a generic instance of an object.
* We need the actual instance in order to differentiate between an UUID and a TimeUUID.
*
* @param obj an instance to use to build the new CellValidator.
* @param the generic type of the provided object instance.
* @return a new CellValidator associated to the provided object.
*/
public static CellValidator cellValidator(T obj) {
if (obj == null) {
return null;
}
Kind kind = Kind.objectToKind(obj);
AbstractType tAbstractType = marshallerInstance(obj);
String validatorClassName = tAbstractType.getClass().getCanonicalName();
Collection validatorTypes = null;
DataType.Name cqlTypeName = MAP_JAVA_TYPE_TO_DATA_TYPE_NAME.get(validatorClassName);// tAbstractType.get
return new CellValidator(validatorClassName, kind, validatorTypes, cqlTypeName);
}
/**
* private constructor.
*/
private CellValidator(String validatorClassName, Kind validatorKind, Collection validatorTypes, DataType.Name cqlTypeName) {
this.validatorClassName = validatorClassName != null ? validatorClassName : DEFAULT_VALIDATOR_CLASSNAME;
this.validatorKind = validatorKind;
this.validatorTypes = validatorTypes;
this.cqlTypeName = cqlTypeName;
}
/**
* private constructor.
*/
private static String getCollectionInnerType(Class type) {
CQL3Type.Native nativeType = MAP_JAVA_TYPE_TO_CQL_TYPE.get(type);
return nativeType.name().toLowerCase();
}
/**
* private constructor.
*/
private CellValidator(Field field) {
Class[] types = AnnotationUtils.getGenericTypes(field);
DeepField annotation = field.getAnnotation(DeepField.class);
Class clazz = annotation.validationClass();
this.validatorClassName = annotation.validationClass().getCanonicalName();
this.validatorKind = Kind.validatorClassToKind(clazz);
cqlTypeName = MAP_JAVA_TYPE_TO_DATA_TYPE_NAME.get(this.validatorClassName);
switch (this.validatorKind) {
case SET:
case LIST:
this.validatorTypes = asList(getCollectionInnerType(types[0]));
break;
case MAP:
this.validatorTypes = asList(getCollectionInnerType(types[0]), getCollectionInnerType(types[1]));
break;
default:
}
}
/**
* private constructor.
*
* @param type a {@link com.datastax.driver.core.DataType} coming from the underlying Java driver.
*/
private CellValidator(DataType type) {
if (type == null) {
throw new DeepInstantiationException("input DataType cannot be null");
}
cqlTypeName = type.getName();
if (!type.isCollection()) {
validatorClassName = AnnotationUtils.MAP_JAVA_TYPE_TO_ABSTRACT_TYPE.get(type.asJavaClass()).getClass()
.getName();
} else {
validatorTypes = new ArrayList<>();
for (DataType dataType : type.getTypeArguments()) {
validatorTypes.add(dataType.toString());
}
switch (type.getName()) {
case SET:
validatorKind = Kind.SET;
validatorClassName = SetType.class.getName();
break;
case LIST:
validatorKind = Kind.LIST;
validatorClassName = ListType.class.getName();
break;
case MAP:
validatorKind = Kind.MAP;
validatorClassName = MapType.class.getName();
break;
default:
throw new DeepGenericException("Cannot determine collection type for " + type.getName());
}
validatorTypes = unmodifiableCollection(validatorTypes);
}
}
/**
* Generates the cassandra marshaller ({@link org.apache.cassandra.db.marshal.AbstractType}) for this CellValidator.
*
* @return an instance of the cassandra marshaller for this CellValidator.
*/
public AbstractType getAbstractType() {
if (abstractType != null) {
return abstractType;
}
try {
if (validatorKind == Kind.NOT_A_COLLECTION) {
abstractType = AnnotationUtils.MAP_ABSTRACT_TYPE_CLASS_TO_ABSTRACT_TYPE.get(forName
(validatorClassName));
} else {
Iterator types = validatorTypes.iterator();
switch (validatorKind) {
case SET:
CQL3Type cql3Type = CQL3Type.Native.valueOf(types.next().toUpperCase());
abstractType = SetType.getInstance(cql3Type.getType());
break;
case LIST:
cql3Type = CQL3Type.Native.valueOf(types.next().toUpperCase());
abstractType = ListType.getInstance(cql3Type.getType());
break;
case MAP:
cql3Type = CQL3Type.Native.valueOf(types.next().toUpperCase());
CQL3Type cql3Type2 = CQL3Type.Native.valueOf(types.next().toUpperCase());
abstractType = MapType.getInstance(cql3Type.getType(), cql3Type2.getType());
break;
default:
throw new DeepGenericException("Cannot determine collection kind for " + validatorKind);
}
}
} catch (ClassNotFoundException e) {
throw new DeepGenericException(e);
}
return abstractType;
}
/**
* Getter for validatorClassName.
*
* @return the cassandra marshaller class name.
*/
public String getValidatorClassName() {
return validatorClassName;
}
/**
* Getter for validatorTypes.
*
* @return a collection of validator type names.
*/
public Collection getValidatorTypes() {
return validatorTypes;
}
/**
* Getter for validatorKind.
*
* @return the Kind associated to this CellValidator.
*/
public Kind validatorKind() {
return validatorKind;
}
/**
* {@inheritDoc}
*/
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
CellValidator that = (CellValidator) o;
if (validatorKind != that.validatorKind) {
return false;
}
if (!validatorClassName.equals(that.validatorClassName)) {
return false;
}
if (validatorKind != Kind.NOT_A_COLLECTION &&
!CollectionUtils.isEqualCollection(validatorTypes, that.validatorTypes)) {
return false;
}
return true;
}
/**
* {@inheritDoc}
*/
@Override
public int hashCode() {
int result = validatorClassName.hashCode();
result = 31 * result + (validatorTypes != null ? validatorTypes.hashCode() : 0);
result = 31 * result + validatorKind.hashCode();
return result;
}
/**
* {@inheritDoc}
*/
@Override
public String toString() {
return "CellValidator{" +
"validatorClassName='" + validatorClassName + '\'' +
", validatorTypes=" + (validatorTypes != null ? validatorTypes : "") +
", validatorKind=" + validatorKind +
", abstractType=" + abstractType +
'}';
}
/**
* @return the original CQL3 type name (if known, null otherwise)
*/
public DataType.Name getCqlTypeName() {
return cqlTypeName;
}
}
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