org.apache.lucene.store.instantiated.InstantiatedIndexReader Maven / Gradle / Ivy
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package org.apache.lucene.store.instantiated;
/**
* Copyright 2006 The Apache Software Foundation
*
* Licensed 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.
*/
import java.io.IOException;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.FieldSelector;
import org.apache.lucene.index.*;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.BitVector;
/**
* An InstantiatedIndexReader is not a snapshot in time, it is completely in
* sync with the latest commit to the store!
*
* Consider using InstantiatedIndex as if it was immutable.
*
* @deprecated contrib/instantiated will be removed in 4.0;
* you can use the memory codec to hold all postings in RAM
*/
@Deprecated
public class InstantiatedIndexReader extends IndexReader {
private final InstantiatedIndex index;
public InstantiatedIndexReader(InstantiatedIndex index) {
super();
this.index = index;
}
@Deprecated
@Override
public boolean isOptimized() {
return true;
}
/**
* An InstantiatedIndexReader is not a snapshot in time, it is completely in
* sync with the latest commit to the store!
*
* @return output from {@link InstantiatedIndex#getVersion()} in associated instantiated index.
*/
@Override
public long getVersion() {
return index.getVersion();
}
@Override
public FieldInfos getFieldInfos() {
return index.getFieldInfos();
}
@Override
public Directory directory() {
throw new UnsupportedOperationException();
}
/**
* An InstantiatedIndexReader is always current!
*
* Check whether this IndexReader is still using the current (i.e., most
* recently committed) version of the index. If a writer has committed any
* changes to the index since this reader was opened, this will return
* false, in which case you must open a new IndexReader in
* order to see the changes. See the description of the autoCommit flag
* which controls when the {@link IndexWriter} actually commits changes to the
* index.
*
* @return always true
* @throws CorruptIndexException if the index is corrupt
* @throws IOException if there is a low-level IO error
* @throws UnsupportedOperationException unless overridden in subclass
*/
@Override
public boolean isCurrent() throws IOException {
return true;
}
public InstantiatedIndex getIndex() {
return index;
}
private BitVector uncommittedDeletedDocuments;
private Map> uncommittedNormsByFieldNameAndDocumentNumber = null;
private class NormUpdate {
private int doc;
private byte value;
public NormUpdate(int doc, byte value) {
this.doc = doc;
this.value = value;
}
}
@Override
public int numDocs() {
// todo i suppose this value could be cached, but array#length and bitvector#count is fast.
int numDocs = getIndex().getDocumentsByNumber().length;
if (uncommittedDeletedDocuments != null) {
numDocs -= uncommittedDeletedDocuments.count();
}
if (index.getDeletedDocuments() != null) {
numDocs -= index.getDeletedDocuments().count();
}
return numDocs;
}
@Override
public int maxDoc() {
return getIndex().getDocumentsByNumber().length;
}
@Override
public boolean hasDeletions() {
return index.getDeletedDocuments() != null || uncommittedDeletedDocuments != null;
}
@Override
public boolean isDeleted(int n) {
return (index.getDeletedDocuments() != null && index.getDeletedDocuments().get(n))
|| (uncommittedDeletedDocuments != null && uncommittedDeletedDocuments.get(n));
}
@Override
protected void doDelete(int docNum) throws IOException {
// dont delete if already deleted
if ((index.getDeletedDocuments() != null && index.getDeletedDocuments().get(docNum))
|| (uncommittedDeletedDocuments != null && uncommittedDeletedDocuments.get(docNum))) {
return;
}
if (uncommittedDeletedDocuments == null) {
uncommittedDeletedDocuments = new BitVector(maxDoc());
}
uncommittedDeletedDocuments.set(docNum);
}
@Override
protected void doUndeleteAll() throws IOException {
// todo: read/write lock
uncommittedDeletedDocuments = null;
// todo: read/write unlock
}
@Override
protected void doCommit(Map commitUserData) throws IOException {
// todo: read/write lock
// 1. update norms
if (uncommittedNormsByFieldNameAndDocumentNumber != null) {
for (Map.Entry> e : uncommittedNormsByFieldNameAndDocumentNumber.entrySet()) {
byte[] norms = getIndex().getNormsByFieldNameAndDocumentNumber().get(e.getKey());
for (NormUpdate normUpdate : e.getValue()) {
norms[normUpdate.doc] = normUpdate.value;
}
}
uncommittedNormsByFieldNameAndDocumentNumber = null;
}
// 2. remove deleted documents
if (uncommittedDeletedDocuments != null) {
if (index.getDeletedDocuments() == null) {
index.setDeletedDocuments(uncommittedDeletedDocuments);
} else {
for (int d = 0; d< uncommittedDeletedDocuments.size(); d++) {
if (uncommittedDeletedDocuments.get(d)) {
index.getDeletedDocuments().set(d);
}
}
}
uncommittedDeletedDocuments = null;
}
// todo unlock read/writelock
}
@Override
protected void doClose() throws IOException {
// ignored
// todo perhaps release all associated instances?
}
/**
* Return the {@link org.apache.lucene.document.Document} at the nth
* position.
* Warning!
* The resulting document is the actual stored document instance
* and not a deserialized clone as retuned by an IndexReader
* over a {@link org.apache.lucene.store.Directory}.
* I.e., if you need to touch the document, clone it first!
*
* This can also be seen as a feature for live changes of stored values,
* but be careful! Adding a field with an name unknown to the index
* or to a field with previously no stored values will make
* {@link org.apache.lucene.store.instantiated.InstantiatedIndexReader#getFieldInfos()}
* out of sync, causing problems for instance when merging the
* instantiated index to another index.
* This implementation ignores the field selector! All stored fields are always returned!
*
*
* @param n document number
* @param fieldSelector ignored
* @return The stored fields of the {@link org.apache.lucene.document.Document} at the nth position
* @throws CorruptIndexException if the index is corrupt
* @throws IOException if there is a low-level IO error
*
* @see org.apache.lucene.document.Fieldable
* @see org.apache.lucene.document.FieldSelector
* @see org.apache.lucene.document.SetBasedFieldSelector
* @see org.apache.lucene.document.LoadFirstFieldSelector
*/
@Override
public Document document(int n, FieldSelector fieldSelector) throws CorruptIndexException, IOException {
return isDeleted(n) ? null : getIndex().getDocumentsByNumber()[n].getDocument();
}
/**
* never ever touch these values. it is the true values, unless norms have
* been touched.
*/
@Override
public byte[] norms(String field) throws IOException {
byte[] norms = getIndex().getNormsByFieldNameAndDocumentNumber().get(field);
if (norms == null) {
return new byte[0]; // todo a static final zero length attribute?
}
if (uncommittedNormsByFieldNameAndDocumentNumber != null) {
norms = norms.clone();
List updated = uncommittedNormsByFieldNameAndDocumentNumber.get(field);
if (updated != null) {
for (NormUpdate normUpdate : updated) {
norms[normUpdate.doc] = normUpdate.value;
}
}
}
return norms;
}
@Override
public void norms(String field, byte[] bytes, int offset) throws IOException {
byte[] norms = getIndex().getNormsByFieldNameAndDocumentNumber().get(field);
if (norms == null) {
return;
}
System.arraycopy(norms, 0, bytes, offset, norms.length);
}
@Override
protected void doSetNorm(int doc, String field, byte value) throws IOException {
if (uncommittedNormsByFieldNameAndDocumentNumber == null) {
uncommittedNormsByFieldNameAndDocumentNumber = new HashMap>(getIndex().getNormsByFieldNameAndDocumentNumber().size());
}
List list = uncommittedNormsByFieldNameAndDocumentNumber.get(field);
if (list == null) {
list = new LinkedList();
uncommittedNormsByFieldNameAndDocumentNumber.put(field, list);
}
list.add(new NormUpdate(doc, value));
}
@Override
public int docFreq(Term t) throws IOException {
InstantiatedTerm term = getIndex().findTerm(t);
if (term == null) {
return 0;
} else {
return term.getAssociatedDocuments().length;
}
}
@Override
public TermEnum terms() throws IOException {
return new InstantiatedTermEnum(this);
}
@Override
public TermEnum terms(Term t) throws IOException {
InstantiatedTerm it = getIndex().findTerm(t);
if (it != null) {
return new InstantiatedTermEnum(this, it.getTermIndex());
} else {
int startPos = Arrays.binarySearch(index.getOrderedTerms(), t, InstantiatedTerm.termComparator);
if (startPos < 0) {
startPos = -1 - startPos;
}
return new InstantiatedTermEnum(this, startPos);
}
}
@Override
public TermDocs termDocs() throws IOException {
return new InstantiatedTermDocs(this);
}
@Override
public TermDocs termDocs(Term term) throws IOException {
if (term == null) {
return new InstantiatedAllTermDocs(this);
} else {
InstantiatedTermDocs termDocs = new InstantiatedTermDocs(this);
termDocs.seek(term);
return termDocs;
}
}
@Override
public TermPositions termPositions() throws IOException {
return new InstantiatedTermPositions(this);
}
@Override
public TermFreqVector[] getTermFreqVectors(int docNumber) throws IOException {
InstantiatedDocument doc = getIndex().getDocumentsByNumber()[docNumber];
if (doc.getVectorSpace() == null) {
return null;
}
TermFreqVector[] ret = new TermFreqVector[doc.getVectorSpace().size()];
Iterator it = doc.getVectorSpace().keySet().iterator();
for (int i = 0; i < ret.length; i++) {
ret[i] = new InstantiatedTermPositionVector(getIndex().getDocumentsByNumber()[docNumber], it.next());
}
return ret;
}
@Override
public TermFreqVector getTermFreqVector(int docNumber, String field) throws IOException {
InstantiatedDocument doc = getIndex().getDocumentsByNumber()[docNumber];
if (doc.getVectorSpace() == null || doc.getVectorSpace().get(field) == null) {
return null;
} else {
return new InstantiatedTermPositionVector(doc, field);
}
}
@Override
public void getTermFreqVector(int docNumber, String field, TermVectorMapper mapper) throws IOException {
InstantiatedDocument doc = getIndex().getDocumentsByNumber()[docNumber];
if (doc.getVectorSpace() != null && doc.getVectorSpace().get(field) == null) {
List tv = doc.getVectorSpace().get(field);
mapper.setExpectations(field, tv.size(), true, true);
for (InstantiatedTermDocumentInformation tdi : tv) {
mapper.map(tdi.getTerm().text(), tdi.getTermPositions().length, tdi.getTermOffsets(), tdi.getTermPositions());
}
}
}
@Override
public void getTermFreqVector(int docNumber, TermVectorMapper mapper) throws IOException {
InstantiatedDocument doc = getIndex().getDocumentsByNumber()[docNumber];
for (Map.Entry> e : doc.getVectorSpace().entrySet()) {
mapper.setExpectations(e.getKey(), e.getValue().size(), true, true);
for (InstantiatedTermDocumentInformation tdi : e.getValue()) {
mapper.map(tdi.getTerm().text(), tdi.getTermPositions().length, tdi.getTermOffsets(), tdi.getTermPositions());
}
}
}
}