| /* |
| * 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.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; |
| |
| /** |
| * {@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); |
| } |
| |
| /** |
| * 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: |
| if (elementClass.isPrimitive()) |
| 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; |
| } |
| try { |
| 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); |
| } |
| } |