[
https://issues.apache.org/jira/browse/BEAM-4453?focusedWorklogId=120940&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-120940
]
ASF GitHub Bot logged work on BEAM-4453:
----------------------------------------
Author: ASF GitHub Bot
Created on: 09/Jul/18 17:55
Start Date: 09/Jul/18 17:55
Worklog Time Spent: 10m
Work Description: reuvenlax commented on a change in pull request #5873:
[BEAM-4453] Add schema support for Java POJOs and Java Beans
URL: https://github.com/apache/beam/pull/5873#discussion_r201093026
##########
File path:
sdks/java/core/src/main/java/org/apache/beam/sdk/schemas/utils/ReflectUtils.java
##########
@@ -0,0 +1,132 @@
+/*
+ * 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.beam.sdk.schemas.utils;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+import com.google.common.collect.Lists;
+import com.google.common.collect.Maps;
+import java.io.IOException;
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+import java.util.Arrays;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.stream.Collectors;
+import javax.annotation.Nullable;
+import org.apache.beam.sdk.schemas.Schema;
+
+/** A set of reflection helper methods. */
+public class ReflectUtils {
+ static class ClassWithSchema {
+ Class clazz;
+ Schema schema;
+
+ public ClassWithSchema(Class clazz, Schema schema) {
+ this.clazz = clazz;
+ this.schema = schema;
+ }
+
+ @Override
+ public boolean equals(Object o) {
+ if (this == o) {
+ return true;
+ }
+ if (o == null || getClass() != o.getClass()) {
+ return false;
+ }
+ ClassWithSchema that = (ClassWithSchema) o;
+ return Objects.equals(clazz, that.clazz) && Objects.equals(schema,
that.schema);
+ }
+
+ @Override
+ public int hashCode() {
+ return Objects.hash(clazz, schema);
+ }
+ }
+
+ private static final Map<Class, List<Method>> DECLARED_METHODS =
Maps.newHashMap();
+ private static final Map<Class, List<Field>> DECLARED_FIELDS =
Maps.newHashMap();
+
+ /** Returns the list of public, non-static methods in the class, caching the
results. */
+ static List<Method> getMethods(Class clazz) throws IOException {
+ return DECLARED_METHODS.computeIfAbsent(
+ clazz,
+ c -> {
+ return Arrays.stream(c.getDeclaredMethods())
+ .filter(m -> Modifier.isPublic(m.getModifiers()))
+ .filter(m -> !Modifier.isStatic(m.getModifiers()))
+ .collect(Collectors.toList());
+ });
+ }
+
+ // Get all public, non-static, non-transient fields.
+ static List<Field> getFields(Class<?> clazz) {
+ return DECLARED_FIELDS.computeIfAbsent(
+ clazz,
+ c -> {
+ Map<String, Field> types = new LinkedHashMap<>();
+ do {
+ if (c.getPackage() != null &&
c.getPackage().getName().startsWith("java.")) {
+ break; // skip java built-in classes
+ }
+ for (java.lang.reflect.Field field : c.getDeclaredFields()) {
+ if ((field.getModifiers() & (Modifier.TRANSIENT |
Modifier.STATIC)) == 0) {
+ if ((field.getModifiers() & Modifier.PUBLIC) != 0) {
+ boolean nullable = field.getAnnotation(Nullable.class) !=
null;
+ checkArgument(
+ types.put(field.getName(), field) == null,
+ c.getSimpleName() + " contains two fields named: " +
field);
+ }
+ }
+ }
+ c = c.getSuperclass();
+ } while (c != null);
+ return Lists.newArrayList(types.values());
+ });
+ }
+
+ static boolean isGetter(Method method) {
+ if (Void.TYPE.equals(method.getReturnType())) {
+ return false;
+ }
+ if (method.getName().startsWith("get") && method.getName().length() > 3) {
+ return true;
+ }
+ return (method.getName().startsWith("is")
+ && method.getName().length() > 2
+ && (Boolean.TYPE.equals(method.getReturnType())
+ || Boolean.class.equals(method.getReturnType())));
+ }
+
+ static boolean isSetter(Method method) {
+ return Void.TYPE.equals(method.getReturnType()) &&
method.getName().startsWith("set");
Review comment:
done
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Issue Time Tracking
-------------------
Worklog Id: (was: 120940)
Time Spent: 9h (was: 8h 50m)
> Provide automatic schema registration for POJOs
> -----------------------------------------------
>
> Key: BEAM-4453
> URL: https://issues.apache.org/jira/browse/BEAM-4453
> Project: Beam
> Issue Type: Sub-task
> Components: sdk-java-core
> Reporter: Reuven Lax
> Assignee: Reuven Lax
> Priority: Major
> Time Spent: 9h
> Remaining Estimate: 0h
>
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