| /* |
| * 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 |
| * <p/> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p/> |
| * 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.flink.streaming.siddhi.schema; |
| |
| import org.apache.flink.api.java.tuple.Tuple; |
| import org.apache.flink.api.java.typeutils.TypeExtractor; |
| import org.apache.flink.util.Preconditions; |
| |
| import java.io.Serializable; |
| import java.lang.reflect.Field; |
| |
| /** |
| * Stream Serialization and Field Extraction Methods. |
| */ |
| public class StreamSerializer<T> implements Serializable { |
| private final StreamSchema<T> schema; |
| |
| public StreamSerializer(StreamSchema<T> schema) { |
| this.schema = schema; |
| } |
| |
| public Object[] getRow(T input) { |
| Preconditions.checkArgument(input.getClass() == schema.getTypeInfo().getTypeClass(), |
| "Invalid input type: " + input + ", expected: " + schema.getTypeInfo()); |
| |
| Object[] data; |
| if (schema.isAtomicType()) { |
| data = new Object[]{input}; |
| } else if (schema.isTupleType()) { |
| Tuple tuple = (Tuple) input; |
| data = new Object[schema.getFieldIndexes().length]; |
| for (int i = 0; i < schema.getFieldIndexes().length; i++) { |
| data[i] = tuple.getField(schema.getFieldIndexes()[i]); |
| } |
| } else if (schema.isPojoType() || schema.isCaseClassType()) { |
| data = new Object[schema.getFieldIndexes().length]; |
| for (int i = 0; i < schema.getFieldNames().length; i++) { |
| data[i] = getFieldValue(schema.getFieldNames()[i], input); |
| } |
| } else { |
| throw new IllegalArgumentException("Failed to get field values from " + schema.getTypeInfo()); |
| } |
| return data; |
| } |
| |
| private Object getFieldValue(String fieldName, T input) { |
| // TODO: Cache Field Accessor |
| Field field = TypeExtractor.getDeclaredField(schema.getTypeInfo().getTypeClass(), fieldName); |
| if (field == null) { |
| throw new IllegalArgumentException(fieldName + " is not found in " + schema.getTypeInfo()); |
| } |
| if (!field.isAccessible()) { |
| field.setAccessible(true); |
| } |
| try { |
| return field.get(input); |
| } catch (IllegalAccessException e) { |
| throw new IllegalStateException(e.getMessage(), e); |
| } |
| } |
| } |