content: /*
   * 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
   *
   *     https://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.avro.reflect;
  
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.List;
  import java.util.Map;
  import java.util.Optional;
  import java.util.Set;
  
  import org.apache.avro.AvroRuntimeException;
  import org.apache.avro.Schema;
  import org.apache.avro.Schema.Field;
  import org.apache.avro.io.Encoder;
  import org.apache.avro.specific.SpecificDatumWriter;
  import org.apache.avro.util.MapEntry;
  
  /**
   * {@link org.apache.avro.io.DatumWriter DatumWriter} for existing classes via
   * Java reflection.
   */
  public class ReflectDatumWriter<T> extends SpecificDatumWriter<T> {
    public ReflectDatumWriter() {
      this(ReflectData.get());
    }
  
    public ReflectDatumWriter(Class<T> c) {
      this(c, ReflectData.get());
    }
  
    public ReflectDatumWriter(Class<T> c, ReflectData data) {
      this(data.getSchema(c), data);
    }
  
    public ReflectDatumWriter(Schema root) {
      this(root, ReflectData.get());
    }
  
    public ReflectDatumWriter(Schema root, ReflectData reflectData) {
      super(root, reflectData);
    }
  
    protected ReflectDatumWriter(ReflectData reflectData) {
      super(reflectData);
    }
  
    private ReflectData getReflectData() {
      return (ReflectData) getSpecificData();
    }
  
    /**
     * Called to write a array. May be overridden for alternate array
     * representations.
     */
    @Override
    protected void writeArray(Schema schema, Object datum, Encoder out) throws IOException {
      if (datum instanceof Collection) {
        super.writeArray(schema, datum, out);
        return;
      }
      Class<?> elementClass = datum.getClass().getComponentType();
      if (null == elementClass) {
        // not a Collection or an Array
        throw new AvroRuntimeException("Array data must be a Collection or Array");
      }
      Schema element = schema.getElementType();
      if (elementClass.isPrimitive()) {
        Schema.Type type = element.getType();
        out.writeArrayStart();
        switch (type) {
        case BOOLEAN:
          ArrayAccessor.writeArray((boolean[]) datum, out);
          break;
        case DOUBLE:
          ArrayAccessor.writeArray((double[]) datum, out);
          break;
        case FLOAT:
          ArrayAccessor.writeArray((float[]) datum, out);
          break;
        case INT:
          if (elementClass.equals(int.class)) {
            ArrayAccessor.writeArray((int[]) datum, out);
          } else if (elementClass.equals(char.class)) {
            ArrayAccessor.writeArray((char[]) datum, out);
          } else if (elementClass.equals(short.class)) {
            ArrayAccessor.writeArray((short[]) datum, out);
          } else {
            arrayError(elementClass, type);
          }
          break;
        case LONG:
          ArrayAccessor.writeArray((long[]) datum, out);
          break;
        default:
          arrayError(elementClass, type);
        }
        out.writeArrayEnd();
      } else {
        out.writeArrayStart();
        writeObjectArray(element, (Object[]) datum, out);
        out.writeArrayEnd();
      }
    }
  
    private void writeObjectArray(Schema element, Object[] data, Encoder out) throws IOException {
      int size = data.length;
      out.setItemCount(size);
      for (Object datum : data) {
        this.write(element, datum, out);
      }
    }
  
    private void arrayError(Class<?> cl, Schema.Type type) {
      throw new AvroRuntimeException("Error writing array with inner type " + cl + " and avro type: " + type);
    }
  
    @Override
    protected void writeBytes(Object datum, Encoder out) throws IOException {
      if (datum instanceof byte[])
        out.writeBytes((byte[]) datum);
      else
        super.writeBytes(datum, out);
    }
  
    @Override
    protected void write(Schema schema, Object datum, Encoder out) throws IOException {
      if (datum instanceof Byte)
        datum = ((Byte) datum).intValue();
      else if (datum instanceof Short)
        datum = ((Short) datum).intValue();
      else if (datum instanceof Character)
        datum = (int) (char) (Character) datum;
      else if (datum instanceof Map && ReflectData.isNonStringMapSchema(schema)) {
        // Maps with non-string keys are written as arrays.
        // Schema for such maps is already changed. Here we
        // just switch the map to a similar form too.
        Set entries = ((Map) datum).entrySet();
        List<Map.Entry> entryList = new ArrayList<>(entries.size());
        for (Object obj : ((Map) datum).entrySet()) {
          Map.Entry e = (Map.Entry) obj;
          entryList.add(new MapEntry(e.getKey(), e.getValue()));
        }
        datum = entryList;
      } else if (datum instanceof Optional) {
        datum = ((Optional) datum).orElse(null);
      }
      try {
  
        CustomEncoding encoder = getReflectData().getCustomEncoding(schema);
        if (encoder != null) {
          encoder.write(datum, out);
        } else {
          super.write(schema, datum, out);
        }
      } catch (NullPointerException e) { // improve error message
        throw npe(e, " in " + schema.getFullName());
      }
    }
  
    @Override
    protected void writeField(Object record, Field f, Encoder out, Object state) throws IOException {
      if (state != null) {
        FieldAccessor accessor = ((FieldAccessor[]) state)[f.pos()];
        if (accessor != null) {
          if (accessor.supportsIO() && (!Schema.Type.UNION.equals(f.schema().getType()) || accessor.isCustomEncoded())) {
            accessor.write(record, out);
            return;
          }
          if (accessor.isStringable()) {
            try {
              Object object = accessor.get(record);
              write(f.schema(), (object == null) ? null : object.toString(), out);
            } catch (IllegalAccessException e) {
              throw new AvroRuntimeException("Failed to write Stringable", e);
            }
            return;
          }
        }
      }
      super.writeField(record, f, out, state);
    }
  }
  