org.apache.thrift.meta_data.FieldMetaData.java Source code

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Here is the source code for org.apache.thrift.meta_data.FieldMetaData.java

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/*
 * 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.
 */
/*
 * 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 org.apache.thrift.TBase;

import java.util.Hashtable;

/**
 * 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 {
    public final String fieldName;
    public final byte requirementType;
    public final FieldValueMetaData valueMetaData;
    private static Hashtable structMap;

    static {
        structMap = new Hashtable();
    }

    public FieldMetaData(String name, byte req, FieldValueMetaData vMetaData) {
        this.fieldName = name;
        this.requirementType = req;
        this.valueMetaData = vMetaData;
    }

    public static synchronized void addStructMetaDataMap(Class sClass, Hashtable 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 Hashtable 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 (Hashtable) structMap.get(sClass);
    }
}