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54 lines
2 KiB
Java
54 lines
2 KiB
Java
// Copyright 2017 The Nomulus Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package google.registry.mapreduce.inputs;
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import com.google.appengine.tools.mapreduce.InputReader;
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import com.google.common.collect.ImmutableSet;
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import com.googlecode.objectify.Key;
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import google.registry.model.EppResource;
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import google.registry.model.index.EppResourceIndex;
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import google.registry.model.index.EppResourceIndexBucket;
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import java.util.NoSuchElementException;
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/**
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* Reader that maps over {@link EppResourceIndex} and returns resource keys.
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*
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* <p>When mapping over keys we can't distinguish between Objectify polymorphic types.
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*/
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class EppResourceKeyReader<R extends EppResource> extends EppResourceBaseReader<Key<R>> {
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private static final long serialVersionUID = -428232054739189774L;
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public EppResourceKeyReader(
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Key<EppResourceIndexBucket> bucketKey, ImmutableSet<Class<? extends R>> resourceClasses) {
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super(
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bucketKey,
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ONE_MB, // Estimate 1MB of memory for this reader, which is massive overkill.
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varargsToKinds(resourceClasses));
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}
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/**
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* Called for each map invocation.
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*
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* @throws NoSuchElementException if there are no more elements, as specified in the
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* {@link InputReader#next} Javadoc.
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*/
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@Override
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@SuppressWarnings("unchecked")
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public Key<R> next() throws NoSuchElementException {
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// This is a safe cast because we filtered on kind inside the query.
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return (Key<R>) nextEri().getKey();
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}
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}
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