| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.cassandra.cql3.functions; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.util.*; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| import org.apache.cassandra.cql3.Json; |
| |
| import org.apache.cassandra.cql3.QueryOptions; |
| import org.apache.cassandra.db.marshal.*; |
| import org.apache.cassandra.exceptions.FunctionExecutionException; |
| import org.apache.cassandra.serializers.MarshalException; |
| import org.apache.cassandra.transport.ProtocolVersion; |
| |
| public class FromJsonFct extends NativeScalarFunction |
| { |
| public static final FunctionName NAME = FunctionName.nativeFunction("fromjson"); |
| |
| private static final Map<AbstractType<?>, FromJsonFct> instances = new ConcurrentHashMap<>(); |
| |
| public static FromJsonFct getInstance(AbstractType<?> returnType) |
| { |
| FromJsonFct func = instances.get(returnType); |
| if (func == null) |
| { |
| func = new FromJsonFct(returnType); |
| instances.put(returnType, func); |
| } |
| return func; |
| } |
| |
| private FromJsonFct(AbstractType<?> returnType) |
| { |
| super("fromjson", returnType, UTF8Type.instance); |
| } |
| |
| public ByteBuffer execute(ProtocolVersion protocolVersion, List<ByteBuffer> parameters) |
| { |
| assert parameters.size() == 1 : "Unexpectedly got " + parameters.size() + " arguments for fromJson()"; |
| ByteBuffer argument = parameters.get(0); |
| if (argument == null) |
| return null; |
| |
| String jsonArg = UTF8Type.instance.getSerializer().deserialize(argument); |
| try |
| { |
| Object object = Json.JSON_OBJECT_MAPPER.readValue(jsonArg, Object.class); |
| if (object == null) |
| return null; |
| return returnType.fromJSONObject(object).bindAndGet(QueryOptions.forProtocolVersion(protocolVersion)); |
| } |
| catch (IOException exc) |
| { |
| throw new FunctionExecutionException(NAME, Collections.singletonList("text"), String.format("Could not decode JSON string '%s': %s", jsonArg, exc.toString())); |
| } |
| catch (MarshalException exc) |
| { |
| throw FunctionExecutionException.create(this, exc); |
| } |
| } |
| } |