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Object mapper for the DataStax CQL Java Driver.
/*
* Copyright (C) 2012-2017 DataStax Inc.
*
* 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.datastax.driver.mapping;
import com.datastax.driver.core.*;
import com.datastax.driver.mapping.MethodMapper.ParamMapper;
import com.datastax.driver.mapping.annotations.*;
import com.google.common.base.Strings;
import com.google.common.reflect.TypeToken;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.*;
import java.util.concurrent.atomic.AtomicInteger;
/**
* Static methods that facilitates parsing:
* - {@link #parseEntity(Class, MappingManager)}: entity classes into {@link EntityMapper} instances
* - {@link #parseUDT(Class, MappingManager)}: UDT classes into {@link MappedUDTCodec} instances.
* - {@link #parseAccessor(Class, MappingManager)}: Accessor interfaces into {@link AccessorMapper} instances.
*/
class AnnotationParser {
private static final Comparator POSITION_COMPARATOR = new Comparator() {
@Override
public int compare(AliasedMappedProperty o1, AliasedMappedProperty o2) {
return o1.mappedProperty.getPosition() - o2.mappedProperty.getPosition();
}
};
private AnnotationParser() {
}
static EntityMapper parseEntity(final Class entityClass, MappingManager mappingManager) {
Table table = AnnotationChecks.getTypeAnnotation(Table.class, entityClass);
String ksName = table.caseSensitiveKeyspace() ? Metadata.quote(table.keyspace()) : table.keyspace().toLowerCase();
String tableName = table.caseSensitiveTable() ? Metadata.quote(table.name()) : table.name().toLowerCase();
ConsistencyLevel writeConsistency = table.writeConsistency().isEmpty() ? null : ConsistencyLevel.valueOf(table.writeConsistency().toUpperCase());
ConsistencyLevel readConsistency = table.readConsistency().isEmpty() ? null : ConsistencyLevel.valueOf(table.readConsistency().toUpperCase());
if (Strings.isNullOrEmpty(table.keyspace())) {
String loggedKeyspace = mappingManager.getSession().getLoggedKeyspace();
if (Strings.isNullOrEmpty(loggedKeyspace))
throw new IllegalArgumentException(String.format(
"Error creating mapper for %s, the @Table annotation declares no default keyspace, and the session is not currently logged to any keyspace",
entityClass
));
ksName = Metadata.quote(loggedKeyspace);
}
KeyspaceMetadata keyspaceMetadata = mappingManager.getSession().getCluster().getMetadata().getKeyspace(ksName);
if (keyspaceMetadata == null)
throw new IllegalArgumentException(String.format("Keyspace %s does not exist", ksName));
AbstractTableMetadata tableMetadata = keyspaceMetadata.getTable(tableName);
if (tableMetadata == null) {
tableMetadata = keyspaceMetadata.getMaterializedView(tableName);
if (tableMetadata == null)
throw new IllegalArgumentException(String.format("Table or materialized view %s does not exist in keyspace %s", tableName, ksName));
}
EntityMapper mapper = new EntityMapper(entityClass, ksName, tableName, writeConsistency, readConsistency);
List pks = new ArrayList();
List ccs = new ArrayList();
List rgs = new ArrayList();
MappingConfiguration configuration = mappingManager.getConfiguration();
Set> properties = configuration.getPropertyMapper().mapTable(entityClass);
AtomicInteger columnCounter = mappingManager.protocolVersionAsInt == 1 ? null : new AtomicInteger(0);
for (MappedProperty mappedProperty : properties) {
String alias = (columnCounter != null)
? "col" + columnCounter.incrementAndGet()
: null;
AliasedMappedProperty aliasedMappedProperty = new AliasedMappedProperty(mappedProperty, alias);
if (mappingManager.protocolVersionAsInt == 1 && mappedProperty.isComputed())
throw new UnsupportedOperationException("Computed properties are not supported with native protocol v1");
if (!mappedProperty.isComputed() && tableMetadata.getColumn(mappedProperty.getMappedName()) == null)
throw new IllegalArgumentException(String.format("Column %s does not exist in table %s.%s",
mappedProperty.getMappedName(), ksName, tableName));
if (mappedProperty.isPartitionKey())
pks.add(aliasedMappedProperty);
else if (mappedProperty.isClusteringColumn())
ccs.add(aliasedMappedProperty);
else
rgs.add(aliasedMappedProperty);
// if the property is of a UDT type, parse it now
for (Class udt : TypeMappings.findUDTs(mappedProperty.getPropertyType().getType()))
mappingManager.getUDTCodec(udt);
}
Collections.sort(pks, POSITION_COMPARATOR);
Collections.sort(ccs, POSITION_COMPARATOR);
AnnotationChecks.validateOrder(pks, "@PartitionKey");
AnnotationChecks.validateOrder(ccs, "@ClusteringColumn");
mapper.addColumns(pks, ccs, rgs);
return mapper;
}
static MappedUDTCodec parseUDT(Class udtClass, MappingManager mappingManager) {
UDT udt = AnnotationChecks.getTypeAnnotation(UDT.class, udtClass);
String ksName = udt.caseSensitiveKeyspace() ? Metadata.quote(udt.keyspace()) : udt.keyspace().toLowerCase();
String udtName = udt.caseSensitiveType() ? Metadata.quote(udt.name()) : udt.name().toLowerCase();
if (Strings.isNullOrEmpty(udt.keyspace())) {
String loggedKeyspace = mappingManager.getSession().getLoggedKeyspace();
if (Strings.isNullOrEmpty(loggedKeyspace))
throw new IllegalArgumentException(String.format(
"Error creating UDT codec for %s, the @UDT annotation declares no default keyspace, and the session is not currently logged to any keyspace",
udtClass
));
ksName = Metadata.quote(loggedKeyspace);
}
KeyspaceMetadata keyspaceMetadata = mappingManager.getSession().getCluster().getMetadata().getKeyspace(ksName);
if (keyspaceMetadata == null)
throw new IllegalArgumentException(String.format("Keyspace %s does not exist", ksName));
UserType userType = keyspaceMetadata.getUserType(udtName);
if (userType == null)
throw new IllegalArgumentException(String.format("User type %s does not exist in keyspace %s", udtName, ksName));
Map propertyMappers = new HashMap();
MappingConfiguration configuration = mappingManager.getConfiguration();
Set> properties = configuration.getPropertyMapper().mapUdt(udtClass);
for (MappedProperty mappedProperty : properties) {
AliasedMappedProperty aliasedMappedProperty = new AliasedMappedProperty(mappedProperty, null);
if (!userType.contains(mappedProperty.getMappedName()))
throw new IllegalArgumentException(String.format("Field %s does not exist in type %s.%s",
mappedProperty.getMappedName(), ksName, userType.getTypeName()));
for (Class fieldUdt : TypeMappings.findUDTs(mappedProperty.getPropertyType().getType()))
mappingManager.getUDTCodec(fieldUdt);
propertyMappers.put(mappedProperty.getMappedName(), aliasedMappedProperty);
}
return new MappedUDTCodec(userType, udtClass, propertyMappers, mappingManager);
}
static AccessorMapper parseAccessor(Class accClass, MappingManager mappingManager) {
if (!accClass.isInterface())
throw new IllegalArgumentException("@Accessor annotation is only allowed on interfaces, got " + accClass);
AnnotationChecks.getTypeAnnotation(Accessor.class, accClass);
List methods = new ArrayList();
for (Method m : accClass.getDeclaredMethods()) {
Query query = m.getAnnotation(Query.class);
if (query == null)
continue;
String queryString = query.value();
Annotation[][] paramAnnotations = m.getParameterAnnotations();
Type[] paramTypes = m.getGenericParameterTypes();
ParamMapper[] paramMappers = new ParamMapper[paramAnnotations.length];
Boolean allParamsNamed = null;
for (int i = 0; i < paramMappers.length; i++) {
String paramName = null;
Class> codecClass = null;
for (Annotation a : paramAnnotations[i]) {
if (a.annotationType().equals(Param.class)) {
Param param = (Param) a;
paramName = param.value();
if (paramName.isEmpty())
paramName = null;
codecClass = param.codec();
if (Defaults.NoCodec.class.equals(codecClass))
codecClass = null;
break;
}
}
boolean thisParamNamed = (paramName != null);
if (allParamsNamed == null)
allParamsNamed = thisParamNamed;
else if (allParamsNamed != thisParamNamed)
throw new IllegalArgumentException(String.format("For method '%s', either all or none of the parameters must be named", m.getName()));
paramMappers[i] = newParamMapper(accClass.getName(), m.getName(), i, paramName, codecClass, paramTypes[i], mappingManager);
}
ConsistencyLevel cl = null;
int fetchSize = -1;
boolean tracing = false;
Boolean idempotent = null;
QueryParameters options = m.getAnnotation(QueryParameters.class);
if (options != null) {
cl = options.consistency().isEmpty() ? null : ConsistencyLevel.valueOf(options.consistency().toUpperCase());
fetchSize = options.fetchSize();
tracing = options.tracing();
if (options.idempotent().length > 1) {
throw new IllegalArgumentException("idemtpotence() attribute can only accept one value");
}
idempotent = options.idempotent().length == 0 ? null : options.idempotent()[0];
}
methods.add(new MethodMapper(m, queryString, paramMappers, cl, fetchSize, tracing, idempotent));
}
return new AccessorMapper(accClass, methods);
}
private static ParamMapper newParamMapper(String className, String methodName, int idx, String paramName, Class> codecClass, Type paramType, MappingManager mappingManager) {
if (paramType instanceof Class) {
Class paramClass = (Class) paramType;
if (TypeMappings.isMappedUDT(paramClass))
mappingManager.getUDTCodec(paramClass);
return new ParamMapper(paramName, idx, TypeToken.of(paramType), codecClass);
} else if (paramType instanceof ParameterizedType) {
for (Class udt : TypeMappings.findUDTs(paramType))
mappingManager.getUDTCodec(udt);
return new ParamMapper(paramName, idx, TypeToken.of(paramType), codecClass);
} else {
throw new IllegalArgumentException(String.format("Cannot map class %s for parameter %s of %s.%s", paramType, paramName, className, methodName));
}
}
}
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