/* * 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.types.Row; 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.isRowType()) { Row row = (Row) input; data = new Object[schema.getFieldIndexes().length]; for (int i = 0; i < schema.getFieldIndexes().length; i++) { data[i] = row.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); } } }