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c458c05801
The dark lord Gosling designed the Java package naming system so that ownership flows from the DNS system. Since we own the domain name registry.google, it seems only appropriate that we should use google.registry as our package name.
79 lines
2.9 KiB
Java
79 lines
2.9 KiB
Java
// Copyright 2016 The Domain Registry 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 com.googlecode.objectify.Ref;
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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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/** Reader that maps over {@link EppResourceIndex} and returns resources. */
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class EppResourceEntityReader<R extends EppResource> extends EppResourceBaseReader<R> {
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private static final long serialVersionUID = -8042933349899971801L;
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/**
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* The resource classes to postfilter for.
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*
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* <p>This can be {@link EppResource} or any descendant classes, regardless of whether those
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* classes map directly to a kind in datastore, with the restriction that none of the classes
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* is a supertype of any of the others.
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*/
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private final ImmutableSet<Class<? extends R>> resourceClasses;
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public EppResourceEntityReader(
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Key<EppResourceIndexBucket> bucketKey,
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ImmutableSet<Class<? extends R>> resourceClasses) {
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super(
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bucketKey,
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ONE_MB * 2, // Estimate 2MB of memory for this reader, since it loads a (max 1MB) entity.
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varargsToKinds(resourceClasses));
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this.resourceClasses = 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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public R next() throws NoSuchElementException {
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// Loop until we find a value, or nextRef() throws a NoSuchElementException.
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while (true) {
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Ref<? extends EppResource> reference = nextEri().getReference();
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EppResource resource = reference.get();
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if (resource == null) {
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logger.severefmt("Broken ERI reference: %s", reference.getKey());
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continue;
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}
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// Postfilter to distinguish polymorphic types (e.g. DomainBase and DomainResource).
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for (Class<? extends R> resourceClass : resourceClasses) {
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if (resourceClass.isAssignableFrom(resource.getClass())) {
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@SuppressWarnings("unchecked")
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R r = (R) resource;
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return r;
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}
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}
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}
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}
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}
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