org.apache.thrift.meta_data.FieldMetaData Maven / Gradle / Ivy
/*
* 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.thrift.meta_data;
import java.util.HashMap;
import java.util.Map;
import org.apache.thrift.TBase;
import org.apache.thrift.TFieldIdEnum;
/**
* This class is used to store meta data about thrift fields. Every field in a
* a struct should have a corresponding instance of this class describing it.
*
*/
public class FieldMetaData implements java.io.Serializable {
public final String fieldName;
public final byte requirementType;
public final FieldValueMetaData valueMetaData;
private static Map, Map> structMap;
static {
structMap = new HashMap, Map>();
}
public FieldMetaData(String name, byte req, FieldValueMetaData vMetaData){
this.fieldName = name;
this.requirementType = req;
this.valueMetaData = vMetaData;
}
public static synchronized void addStructMetaDataMap(Class sClass, Map map){
structMap.put(sClass, map);
}
/**
* Returns a map with metadata (i.e. instances of FieldMetaData) that
* describe the fields of the given class.
*
* @param sClass The TBase class for which the metadata map is requested
*/
public static synchronized Map getStructMetaDataMap(Class sClass){
if (!structMap.containsKey(sClass)){ // Load class if it hasn't been loaded
try{
sClass.newInstance();
} catch (InstantiationException e){
throw new RuntimeException("InstantiationException for TBase class: " + sClass.getName() + ", message: " + e.getMessage());
} catch (IllegalAccessException e){
throw new RuntimeException("IllegalAccessException for TBase class: " + sClass.getName() + ", message: " + e.getMessage());
}
}
return structMap.get(sClass);
}
}