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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2016-2018 Ericsson. All rights reserved.
* Modifications Copyright (C) 2019-2021 Nordix Foundation.
* ================================================================================
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.policy.apex.plugins.context.schema.avro;
import java.util.HashMap;
import java.util.Map;
import java.util.TreeMap;
import org.apache.avro.Schema;
import org.apache.avro.Schema.Type;
import org.apache.avro.generic.GenericData;
import org.onap.policy.apex.context.ContextRuntimeException;
import org.onap.policy.apex.model.basicmodel.concepts.AxKey;
import org.slf4j.ext.XLogger;
import org.slf4j.ext.XLoggerFactory;
/**
* This class does direct mapping from Avro classes to Java classes, used for Avro primitive types that directly produce
* Java objects.
*
* @author Liam Fallon (liam.fallon@ericsson.com)
*/
public class AvroDirectObjectMapper implements AvroObjectMapper {
// Get a reference to the logger
private static final XLogger LOGGER = XLoggerFactory.getXLogger(AvroDirectObjectMapper.class);
// Map for Avro primitive types to Java primitive types
private static final Map<Schema.Type, Class<?>> AVRO_JAVA_TYPE_MAP = new TreeMap<>();
// @formatter:off
// Initialize the mapping
static {
AVRO_JAVA_TYPE_MAP.put(Schema.Type.ARRAY, GenericData.Array.class);
AVRO_JAVA_TYPE_MAP.put(Schema.Type.BOOLEAN, Boolean.class);
AVRO_JAVA_TYPE_MAP.put(Schema.Type.DOUBLE, Double.class);
AVRO_JAVA_TYPE_MAP.put(Schema.Type.ENUM, GenericData.EnumSymbol.class);
AVRO_JAVA_TYPE_MAP.put(Schema.Type.FIXED, GenericData.Fixed.class);
AVRO_JAVA_TYPE_MAP.put(Schema.Type.FLOAT, Float.class);
AVRO_JAVA_TYPE_MAP.put(Schema.Type.INT, Integer.class);
AVRO_JAVA_TYPE_MAP.put(Schema.Type.LONG, Long.class);
AVRO_JAVA_TYPE_MAP.put(Schema.Type.MAP, HashMap.class);
AVRO_JAVA_TYPE_MAP.put(Schema.Type.NULL, null);
AVRO_JAVA_TYPE_MAP.put(Schema.Type.RECORD, GenericData.Record.class);
}
// @formatter:on
// The user keyAvro type for direct mapping
private AxKey userKey;
private Type avroType;
// The Apex compatible class
private Class<?> schemaClass;
/**
* {@inheritDoc}.
*/
@Override
public Class<?> getJavaClass() {
return schemaClass;
}
/**
* {@inheritDoc}.
*/
@Override
public void init(final AxKey initUserKey, final Type initAvroType) {
this.userKey = initUserKey;
this.avroType = initAvroType;
schemaClass = AVRO_JAVA_TYPE_MAP.get(avroType);
}
/**
* {@inheritDoc}.
*/
@Override
public Object createNewInstance(final Schema avroSchema) {
// By default, we do not create an instance, normal Java object creation is sufficient
return null;
}
/**
* {@inheritDoc}.
*/
@Override
public Type getAvroType() {
return avroType;
}
/**
* {@inheritDoc}.
*/
@Override
public Object mapFromAvro(final Object avroObject) {
// Always return null if the schema is a null schema
if (schemaClass == null) {
return null;
}
// It is legal for the schema class to be null, if the Avro schema has a "null" type then
// the decoded object is always returned as a null
if (!schemaClass.isAssignableFrom(avroObject.getClass())) {
final var returnString = userKey.getId() + ": object \"" + avroObject + "\" of class \""
+ avroObject.getClass() + "\" cannot be decoded to an object of class \""
+ schemaClass.getName() + "\"";
LOGGER.warn(returnString);
throw new ContextRuntimeException(returnString);
}
return avroObject;
}
/**
* {@inheritDoc}.
*/
@Override
public Object mapToAvro(final Object object) {
// Null values are only allowed if the schema class is null
if (object == null && schemaClass != null) {
final var returnString = userKey.getId() + ": cannot encode a null object of class \""
+ schemaClass.getName() + "\"";
LOGGER.warn(returnString);
throw new ContextRuntimeException(returnString);
}
// For direct mappings, just work directly with the Java objects
return object;
}
}
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