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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.test.engine;
import org.apache.lucene.index.BinaryDocValues;
import org.apache.lucene.index.Fields;
import org.apache.lucene.index.FilterLeafReader;
import org.apache.lucene.index.LeafReader;
import org.apache.lucene.index.NumericDocValues;
import org.apache.lucene.index.PostingsEnum;
import org.apache.lucene.index.SortedDocValues;
import org.apache.lucene.index.SortedSetDocValues;
import org.apache.lucene.index.Terms;
import org.apache.lucene.index.TermsEnum;
import org.apache.lucene.util.BytesRef;
import org.apache.lucene.util.automaton.CompiledAutomaton;
import java.io.IOException;
/**
* An FilterLeafReader that allows to throw exceptions if certain methods
* are called on is. This allows to test parts of the system under certain
* error conditions that would otherwise not be possible.
*/
public class ThrowingLeafReaderWrapper extends FilterLeafReader {
private final Thrower thrower;
/**
* Flags passed to {@link Thrower#maybeThrow(org.elasticsearch.test.engine.ThrowingLeafReaderWrapper.Flags)}
* when the corresponding method is called.
*/
public enum Flags {
TermVectors,
Terms,
TermsEnum,
Intersect,
DocsEnum,
DocsAndPositionsEnum,
Fields,
Norms, NumericDocValues, BinaryDocValues, SortedDocValues, SortedSetDocValues;
}
/**
* A callback interface that allows to throw certain exceptions for
* methods called on the IndexReader that is wrapped by {@link ThrowingLeafReaderWrapper}
*/
public interface Thrower {
/**
* Maybe throws an exception ;)
*/
void maybeThrow(Flags flag) throws IOException;
/**
* If this method returns true the {@link Terms} instance for the given field
* is wrapped with Thrower support otherwise no exception will be thrown for
* the current {@link Terms} instance or any other instance obtained from it.
*/
boolean wrapTerms(String field);
}
public ThrowingLeafReaderWrapper(LeafReader in, Thrower thrower) {
super(in);
this.thrower = thrower;
}
@Override
public Fields fields() throws IOException {
Fields fields = super.fields();
thrower.maybeThrow(Flags.Fields);
return fields == null ? null : new ThrowingFields(fields, thrower);
}
@Override
public Fields getTermVectors(int docID) throws IOException {
Fields fields = super.getTermVectors(docID);
thrower.maybeThrow(Flags.TermVectors);
return fields == null ? null : new ThrowingFields(fields, thrower);
}
/**
* Wraps a Fields but with additional asserts
*/
public static class ThrowingFields extends FilterFields {
private final Thrower thrower;
public ThrowingFields(Fields in, Thrower thrower) {
super(in);
this.thrower = thrower;
}
@Override
public Terms terms(String field) throws IOException {
Terms terms = super.terms(field);
if (thrower.wrapTerms(field)) {
thrower.maybeThrow(Flags.Terms);
return terms == null ? null : new ThrowingTerms(terms, thrower);
}
return terms;
}
}
/**
* Wraps a Terms but with additional asserts
*/
public static class ThrowingTerms extends FilterTerms {
private final Thrower thrower;
public ThrowingTerms(Terms in, Thrower thrower) {
super(in);
this.thrower = thrower;
}
@Override
public TermsEnum intersect(CompiledAutomaton automaton, BytesRef bytes) throws IOException {
TermsEnum termsEnum = in.intersect(automaton, bytes);
thrower.maybeThrow(Flags.Intersect);
return new ThrowingTermsEnum(termsEnum, thrower);
}
@Override
public TermsEnum iterator() throws IOException {
TermsEnum termsEnum = super.iterator();
thrower.maybeThrow(Flags.TermsEnum);
return new ThrowingTermsEnum(termsEnum, thrower);
}
}
static class ThrowingTermsEnum extends FilterTermsEnum {
private final Thrower thrower;
ThrowingTermsEnum(TermsEnum in, Thrower thrower) {
super(in);
this.thrower = thrower;
}
@Override
public PostingsEnum postings(PostingsEnum reuse, int flags) throws IOException {
if ((flags & PostingsEnum.POSITIONS) != 0) {
thrower.maybeThrow(Flags.DocsAndPositionsEnum);
} else {
thrower.maybeThrow(Flags.DocsEnum);
}
return super.postings(reuse, flags);
}
}
@Override
public NumericDocValues getNumericDocValues(String field) throws IOException {
thrower.maybeThrow(Flags.NumericDocValues);
return super.getNumericDocValues(field);
}
@Override
public BinaryDocValues getBinaryDocValues(String field) throws IOException {
thrower.maybeThrow(Flags.BinaryDocValues);
return super.getBinaryDocValues(field);
}
@Override
public SortedDocValues getSortedDocValues(String field) throws IOException {
thrower.maybeThrow(Flags.SortedDocValues);
return super.getSortedDocValues(field);
}
@Override
public SortedSetDocValues getSortedSetDocValues(String field) throws IOException {
thrower.maybeThrow(Flags.SortedSetDocValues);
return super.getSortedSetDocValues(field);
}
@Override
public NumericDocValues getNormValues(String field) throws IOException {
thrower.maybeThrow(Flags.Norms);
return super.getNormValues(field);
}
@Override
public CacheHelper getCoreCacheHelper() {
return in.getCoreCacheHelper();
}
@Override
public CacheHelper getReaderCacheHelper() {
return in.getReaderCacheHelper();
}
}
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