| /* |
| * 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.pirk.query.wideskies; |
| |
| import com.google.gson.Gson; |
| import com.google.gson.JsonDeserializationContext; |
| import com.google.gson.JsonDeserializer; |
| import com.google.gson.JsonElement; |
| import com.google.gson.JsonObject; |
| import com.google.gson.JsonParseException; |
| import com.google.gson.reflect.TypeToken; |
| import org.apache.pirk.schema.query.QuerySchema; |
| import org.apache.pirk.schema.query.filter.DataFilter; |
| import org.apache.pirk.schema.query.filter.FilterFactory; |
| import org.apache.pirk.utils.PIRException; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.IOException; |
| import java.lang.reflect.Type; |
| import java.math.BigInteger; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.SortedMap; |
| import java.util.UUID; |
| |
| /** |
| * Custom deserializer for Query class for Gson. |
| */ |
| public class QueryDeserializer implements JsonDeserializer<Query> |
| { |
| |
| private static final Logger logger = LoggerFactory.getLogger(QueryDeserializer.class); |
| |
| private static final Gson gson = new Gson(); |
| |
| @Override public Query deserialize(JsonElement jsonElement, Type type, JsonDeserializationContext jsonDeserializationContext) throws JsonParseException |
| { |
| JsonObject jsonObject = jsonElement.getAsJsonObject(); |
| logger.info("Got query json:" + jsonObject.toString()); |
| // Check the version number. |
| long queryVersion = jsonObject.get("queryVersion").getAsLong(); |
| if (queryVersion != Query.querySerialVersionUID) |
| { |
| throw new JsonParseException( |
| "Attempt to deserialize unsupported query version. Supported: " + Query.querySerialVersionUID + "; Received: " + queryVersion); |
| } |
| // Then deserialize the Query Info |
| QueryInfo queryInfo = deserializeInfo(jsonObject.get("queryInfo").getAsJsonObject()); |
| SortedMap<Integer,BigInteger> queryElements = gson.fromJson(jsonObject.get("queryElements"), new TypeToken<SortedMap<Integer,BigInteger>>() |
| { |
| }.getType()); |
| BigInteger N = new BigInteger(jsonObject.get("n").getAsString()); |
| BigInteger NSquared = new BigInteger(jsonObject.get("nsquared").getAsString()); |
| Map<Integer,String> expFileBasedLookup = gson.fromJson(jsonObject.get("expFileBasedLookup"), new TypeToken<Map<Integer,String>>() |
| { |
| }.getType()); |
| |
| Query query = new Query(queryInfo, N, NSquared, queryElements); |
| query.setExpFileBasedLookup(expFileBasedLookup); |
| return query; |
| } |
| |
| /** |
| * Deserializes a QueryInfo JsonObject |
| * |
| * @param queryInfoJson A JsonObject at the root of a serialized QueryInfo object. |
| * @return A QueryInfo object of the deserialized Json. |
| * @throws JsonParseException |
| */ |
| public static QueryInfo deserializeInfo(JsonObject queryInfoJson) throws JsonParseException |
| { |
| // First check the version. |
| long infoVersion = queryInfoJson.get("queryInfoVersion").getAsLong(); |
| if (infoVersion != QueryInfo.queryInfoSerialVersionUID) |
| { |
| throw new JsonParseException( |
| "Attempt to deserialize unsupported query info version. Supported: " + QueryInfo.queryInfoSerialVersionUID + "; Received: " + infoVersion); |
| } |
| // Deserialize the QuerySchema next, accounting for the possibility that it is null. |
| QuerySchema querySchema; |
| if (queryInfoJson.get("qSchema").isJsonNull()) |
| { |
| querySchema = null; |
| } |
| else |
| { |
| querySchema = deserializeSchema(queryInfoJson.get("qSchema").getAsJsonObject()); |
| } |
| // Now start making the QueryInfo object. |
| QueryInfo info = new QueryInfo(UUID.fromString(queryInfoJson.get("identifier").getAsString()), queryInfoJson.get("numSelectors").getAsInt(), |
| queryInfoJson.get("hashBitSize").getAsInt(), queryInfoJson.get("hashKey").getAsString(), queryInfoJson.get("dataPartitionBitSize").getAsInt(), |
| queryInfoJson.get("queryType").getAsString(), queryInfoJson.get("useExpLookupTable").getAsBoolean(), queryInfoJson.get("embedSelector").getAsBoolean(), |
| queryInfoJson.get("useHDFSExpLookupTable").getAsBoolean(), queryInfoJson.get("numBitsPerDataElement").getAsInt(), querySchema); |
| return info; |
| } |
| |
| /** |
| * Deserializes a QuerySchema JsonObject |
| * |
| * @param querySchemaJson A JsonObject at the root of a serialized QuerySchema object. |
| * @return A QuerySchema object of the deserialized Json. |
| * @throws JsonParseException |
| */ |
| private static QuerySchema deserializeSchema(JsonObject querySchemaJson) throws JsonParseException |
| { |
| // Deserialize The Query Schema First. |
| long schemaVersion = querySchemaJson.get("querySchemaVersion").getAsLong(); |
| if (schemaVersion != QuerySchema.querySchemaSerialVersionUID) |
| { |
| throw new JsonParseException( |
| "Attempt to deserialize unsupported query info version. Supported: " + QueryInfo.queryInfoSerialVersionUID + "; Received: " + schemaVersion); |
| } |
| String dataFilterName = querySchemaJson.get("filterTypeName").getAsString(); |
| Set<String> filteredElementNames; |
| try |
| { |
| filteredElementNames = gson.fromJson(querySchemaJson.get("filteredElementNames"), new TypeToken<Set<String>>() |
| { |
| }.getType()); |
| } catch (Exception e) |
| { |
| logger.warn("No filtered element names for Query Schema deserialization."); |
| filteredElementNames = null; |
| } |
| // Set up the data filter |
| DataFilter dataFilter; |
| try |
| { |
| dataFilter = FilterFactory.getFilter(dataFilterName, filteredElementNames); |
| } catch (IOException | PIRException e) |
| { |
| logger.error("Error trying to create data filter from JSON.", e); |
| throw new JsonParseException(e); |
| } |
| |
| QuerySchema querySchema = new QuerySchema(querySchemaJson.get("schemaName").getAsString(), querySchemaJson.get("dataSchemaName").getAsString(), |
| querySchemaJson.get("selectorName").getAsString(), dataFilterName, dataFilter, querySchemaJson.get("dataElementSize").getAsInt()); |
| List<String> elementNames = gson.fromJson(querySchemaJson.get("elementNames"), new TypeToken<List<String>>() |
| { |
| }.getType()); |
| querySchema.getElementNames().addAll(elementNames); |
| HashMap<String,String> additionalFields = gson.fromJson(querySchemaJson.get("additionalFields"), new TypeToken<HashMap<String,String>>() |
| { |
| }.getType()); |
| querySchema.getAdditionalFields().putAll(additionalFields); |
| return querySchema; |
| } |
| } |