gt:         struct.setField_ = struct.enumForId(field.id);
context: /**
   * 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;
  
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  import java.nio.ByteBuffer;
  
  import org.apache.thrift.TUnion.TUnionStandardScheme;
  import org.apache.thrift.protocol.TField;
  import org.apache.thrift.protocol.TProtocol;
  import org.apache.thrift.protocol.TProtocolException;
  import org.apache.thrift.protocol.TStruct;
  import org.apache.thrift.scheme.IScheme;
  import org.apache.thrift.scheme.SchemeFactory;
  import org.apache.thrift.scheme.StandardScheme;
  import org.apache.thrift.scheme.TupleScheme;
  
  public abstract class TUnion<T extends TUnion<?,?>, F extends TFieldIdEnum> implements TBase<T, F> {
  
    protected Object value_;
    protected F setField_;
  
    protected TUnion() {
      setField_ = null;
      value_ = null;
    }
    
    private static final Map<Class<? extends IScheme>, SchemeFactory> schemes = new HashMap<Class<? extends IScheme>, SchemeFactory>();
    static {
      schemes.put(StandardScheme.class, new TUnionStandardSchemeFactory());
      schemes.put(TupleScheme.class, new TUnionTupleSchemeFactory());
    }
  
    protected TUnion(F setField, Object value) {
      setFieldValue(setField, value);
    }
  
    protected TUnion(TUnion<T, F> other) {
      if (!other.getClass().equals(this.getClass())) {
        throw new ClassCastException();
      }
      setField_ = other.setField_;
      value_ = deepCopyObject(other.value_);
    }
  
    private static Object deepCopyObject(Object o) {
      if (o instanceof TBase) {
        return ((TBase)o).deepCopy();
      } else if (o instanceof ByteBuffer) {
        return TBaseHelper.copyBinary((ByteBuffer)o);
      } else if (o instanceof List) {
        return deepCopyList((List)o);
      } else if (o instanceof Set) {
        return deepCopySet((Set)o);
      } else if (o instanceof Map) {
        return deepCopyMap((Map)o);
      } else {
        return o;
      }
    }
  
    private static Map deepCopyMap(Map<Object, Object> map) {
      Map copy = new HashMap();
      for (Map.Entry<Object, Object> entry : map.entrySet()) {
        copy.put(deepCopyObject(entry.getKey()), deepCopyObject(entry.getValue()));
      }
      return copy;
    }
  
    private static Set deepCopySet(Set set) {
      Set copy = new HashSet();
      for (Object o : set) {
        copy.add(deepCopyObject(o));
      }
      return copy;
    }
  
    private static List deepCopyList(List list) {
      List copy = new ArrayList(list.size());
      for (Object o : list) {
        copy.add(deepCopyObject(o));
      }
      return copy;
    }
  
    public F getSetField() {
      return setField_;
    }
  
    public Object getFieldValue() {
      return value_;
    }
  
    public Object getFieldValue(F fieldId) {
      if (fieldId != setField_) {
        throw new IllegalArgumentException("Cannot get the value of field " + fieldId + " because union's set field is " + setField_);
      }
  
      return getFieldValue();
    }
  
    public Object getFieldValue(int fieldId) {
      return getFieldValue(enumForId((short)fieldId));
    }
  
    public boolean isSet() {
      return setField_ != null;
    }
  
    public boolean isSet(F fieldId) {
      return setField_ == fieldId;
    }
  
    public boolean isSet(int fieldId) {
      return isSet(enumForId((short)fieldId));
    }
  
    public void read(TProtocol iprot) throws TException {
      schemes.get(iprot.getScheme()).getScheme().read(iprot, this);
    }
  
    public void setFieldValue(F fieldId, Object value) {
      checkType(fieldId, value);
      setField_ = fieldId;
      value_ = value;
    }
  
    public void setFieldValue(int fieldId, Object value) {
      setFieldValue(enumForId((short)fieldId), value);
    }
  
    public void write(TProtocol oprot) throws TException {
      schemes.get(oprot.getScheme()).getScheme().write(oprot, this);
    }
  
    /**
     * Implementation should be generated so that we can efficiently type check 
     * various values.
     * @param setField
     * @param value
     */
    protected abstract void checkType(F setField, Object value) throws ClassCastException;
  
    /**
     * Implementation should be generated to read the right stuff from the wire 
     * based on the field header. 
     * @param field
     * @return read Object based on the field header, as specified by the argument.
     */
    protected abstract Object standardSchemeReadValue(TProtocol iprot, TField field) throws TException;
    protected abstract void standardSchemeWriteValue(TProtocol oprot) throws TException;
    
    protected abstract Object tupleSchemeReadValue(TProtocol iprot, short fieldID) throws TException;
    protected abstract void tupleSchemeWriteValue(TProtocol oprot) throws TException;
  
    protected abstract TStruct getStructDesc();
  
    protected abstract TField getFieldDesc(F setField);
  
    protected abstract F enumForId(short id);
  
    @Override
    public String toString() {
      StringBuilder sb = new StringBuilder();
      sb.append("<");
      sb.append(this.getClass().getSimpleName());
      sb.append(" ");
  
      if (getSetField() != null) {
        Object v = getFieldValue();
        sb.append(getFieldDesc(getSetField()).name);
        sb.append(":");
        if(v instanceof ByteBuffer) {
          TBaseHelper.toString((ByteBuffer)v, sb);
        } else {
          sb.append(v.toString());
        }
      }
      sb.append(">");
      return sb.toString();
    }
  
    public final void clear() {
      this.setField_ = null;
      this.value_ = null;
    }
    
    private static class TUnionStandardSchemeFactory implements SchemeFactory {
      public TUnionStandardScheme getScheme() {
        return new TUnionStandardScheme();
      }
    }
    
    public static class TUnionStandardScheme extends StandardScheme<TUnion> {
  
      public void read(TProtocol iprot, TUnion struct) throws TException {
        struct.setField_ = null;
        struct.value_ = null;
  
        iprot.readStructBegin();
  
        TField field = iprot.readFieldBegin();
  
        struct.value_ = struct.standardSchemeReadValue(iprot, field);
        if (struct.value_ != null) {
  