/**
* 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.drill.common;
import java.io.IOException;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import org.apache.drill.common.JSONOptions.De;
import org.apache.drill.common.JSONOptions.Se;
import org.apache.drill.common.config.DrillConfig;
import org.apache.drill.common.exceptions.LogicalPlanParsingException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonLocation;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.TreeNode;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
import com.fasterxml.jackson.databind.ser.std.StdSerializer;
@JsonSerialize(using = Se.class)
@JsonDeserialize(using = De.class)
public class JSONOptions {
final static Logger logger = LoggerFactory.getLogger(JSONOptions.class);
private JsonNode root;
private JsonLocation location;
private Object opaque;
public JSONOptions(Object opaque) {
this.opaque = opaque;
}
public JSONOptions(JsonNode n, JsonLocation location) {
this.root = n;
this.location = location;
}
@SuppressWarnings("unchecked")
public <T> T getWith(DrillConfig config, Class<T> c) {
try {
if (opaque != null) {
if (opaque.getClass().equals(c)) {
return (T) opaque;
} else {
throw new IllegalArgumentException(String.format("Attmpted to retrieve a option with type of %s. However, the JSON options carried an opaque value of type %s.", c.getName(), opaque.getClass().getName()));
}
}
//logger.debug("Read tree {}", root);
return config.getMapper().treeToValue(root, c);
} catch (JsonProcessingException e) {
throw new LogicalPlanParsingException(String.format("Failure while trying to convert late bound json options to type of %s. Reference was originally located at line %d, column %d.", c.getCanonicalName(), location.getLineNr(), location.getColumnNr()), e);
}
}
public <T> T getListWith(DrillConfig config, TypeReference<T> t) throws IOException {
return getListWith(config.getMapper(), t);
}
@SuppressWarnings("unchecked")
public <T> T getListWith(ObjectMapper mapper, TypeReference<T> t) throws IOException {
if (opaque != null) {
Type c = t.getType();
if (c instanceof ParameterizedType) {
c = ((ParameterizedType)c).getRawType();
}
if ( c.equals(opaque.getClass())) {
return (T) opaque;
} else {
throw new IOException(String.format("Attmpted to retrieve a list with type of %s. However, the JSON options carried an opaque value of type %s.", t.getType(), opaque.getClass().getName()));
}
}
if (root == null) {
return null;
}
return mapper.treeAsTokens(root).readValueAs(t);
}
public JsonNode path(String name) {
return root.path(name);
}
public JsonNode getRoot() {
return root;
}
public static class De extends StdDeserializer<JSONOptions> {
public De() {
super(JSONOptions.class);
logger.debug("Creating Deserializer.");
}
@Override
public JSONOptions deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException,
JsonProcessingException {
JsonLocation l = jp.getTokenLocation();
// logger.debug("Reading tree.");
TreeNode n = jp.readValueAsTree();
// logger.debug("Tree {}", n);
if (n instanceof JsonNode) {
return new JSONOptions( (JsonNode) n, l);
} else {
throw new IllegalArgumentException(String.format("Received something other than a JsonNode %s", n));
}
}
}
public static class Se extends StdSerializer<JSONOptions> {
public Se() {
super(JSONOptions.class);
}
@Override
public void serialize(JSONOptions value, JsonGenerator jgen, SerializerProvider provider) throws IOException,
JsonGenerationException {
if (value.opaque != null) {
jgen.writeObject(value.opaque);
} else {
jgen.writeTree(value.root);
}
}
}
}