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https://issues.apache.org/jira/browse/BEAM-6054?focusedWorklogId=165407&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-165407
]
ASF GitHub Bot logged work on BEAM-6054:
----------------------------------------
Author: ASF GitHub Bot
Created on: 13/Nov/18 12:44
Start Date: 13/Nov/18 12:44
Worklog Time Spent: 10m
Work Description: VaclavPlajt commented on a change in pull request
#7019: [BEAM-6054] Euphoria translation providers refactored.
URL: https://github.com/apache/beam/pull/7019#discussion_r233021810
##########
File path:
sdks/java/extensions/euphoria/src/main/java/org/apache/beam/sdk/extensions/euphoria/core/translate/provider/CompositeProvider.java
##########
@@ -0,0 +1,83 @@
+/*
+ * 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.extensions.euphoria.core.translate.provider;
+
+import static java.util.Objects.requireNonNull;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Optional;
+import
org.apache.beam.sdk.extensions.euphoria.core.annotation.stability.Experimental;
+import
org.apache.beam.sdk.extensions.euphoria.core.client.operator.base.Operator;
+import
org.apache.beam.sdk.extensions.euphoria.core.translate.OperatorTranslator;
+import
org.apache.beam.sdk.extensions.euphoria.core.translate.TranslatorProvider;
+
+/**
+ * An implementation of {@link TranslatorProvider} which allows to stack other
{@link
+ * TranslatorProvider TranslatorProviders} in order given on construction time.
+ */
+@Experimental
+public class CompositeProvider implements TranslatorProvider {
+
+ private final List<TranslatorProvider> orderedTranslatorsChain;
+
+ private CompositeProvider(List<TranslatorProvider> orderedTranslatorsChain) {
+ requireNonNull(orderedTranslatorsChain);
+ this.orderedTranslatorsChain = orderedTranslatorsChain;
+ }
+
+ public static CompositeProvider of(List<TranslatorProvider>
orderedTranslatorsChain) {
+ return new CompositeProvider(orderedTranslatorsChain);
+ }
+
+ public static CompositeProvider of(TranslatorProvider...
orderedTranslatorsChain) {
+ requireNonNull(orderedTranslatorsChain);
+ return new CompositeProvider(Arrays.asList(orderedTranslatorsChain));
+ }
+
+ /**
+ * Returns first {@code Optional<OperatorTranslator<InputT, OutputT,
OperatorT>>} which {@link
+ * OperatorTranslator#canTranslate(Operator) can translate} given operator.
+ *
+ * <p>Translators are acquired by calling {@link
TranslatorProvider#findTranslator(Operator)} on
+ * {@link TranslatorProvider TranslatorProviders} from list given at
construction time in given
+ * order.
+ *
+ * @param operator operator to translate
+ * @param <InputT> the type of input elements
+ * @param <OutputT> the type of output elements
+ * @param <OperatorT> the type of the euphoria operator
+ * @return first {@code Optional<OperatorTranslator<InputT, OutputT,
OperatorT>>} which {@link
+ * OperatorTranslator#canTranslate(Operator) can translate} given
operator.
+ */
+ @Override
+ public <InputT, OutputT, OperatorT extends Operator<OutputT>>
+ Optional<OperatorTranslator<InputT, OutputT, OperatorT>>
findTranslator(OperatorT operator) {
+
+ for (int i = 0; i < orderedTranslatorsChain.size(); i++) {
Review comment:
shure
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Issue Time Tracking
-------------------
Worklog Id: (was: 165407)
Time Spent: 1.5h (was: 1h 20m)
> Refactor traslator providers
> -----------------------------
>
> Key: BEAM-6054
> URL: https://issues.apache.org/jira/browse/BEAM-6054
> Project: Beam
> Issue Type: Sub-task
> Components: dsl-euphoria
> Reporter: Vaclav Plajt
> Assignee: Vaclav Plajt
> Priority: Major
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> We need following functionality:
> 1. Way of registering translator providers for operator type with optional
> user-defined predicate
> 1. Way of registering translator providers for any operator based on
> predicate. (e.g `CompositeOperatorTranslator`)
> 1. Way of chaining translator providers
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