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.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.FieldSelector;
import org.apache.lucene.index.CorruptIndexException;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.index.TermDocs;
import org.apache.lucene.index.TermEnum;
import org.apache.lucene.index.TermFreqVector;
import org.apache.lucene.index.TermPositions;
import org.apache.lucene.index.TermVectorMapper;
import org.apache.lucene.store.Directory;
/**
* 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.
*/
public class InstantiatedIndexReader extends IndexReader {
private final InstantiatedIndex index;
public InstantiatedIndexReader(InstantiatedIndex index) {
super();
this.index = index;
}
/**
* @return always true.
*/
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.
*/
public long getVersion() {
return index.getVersion();
}
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
*/
public boolean isCurrent() throws IOException {
return true;
}
public InstantiatedIndex getIndex() {
return index;
}
private Set deletedDocuments = new HashSet();
private Set deletedDocumentNumbers = new HashSet();
private Map> updatedNormsByFieldNameAndDocumentNumber = null;
private class NormUpdate {
private int doc;
private byte value;
public NormUpdate(int doc, byte value) {
this.doc = doc;
this.value = value;
}
}
public int numDocs() {
return getIndex().getDocumentsByNumber().length - index.getDeletedDocuments().size() - deletedDocuments.size();
}
public int maxDoc() {
return getIndex().getDocumentsByNumber().length;
}
public boolean isDeleted(int n) {
return getIndex().getDeletedDocuments().contains(n) || deletedDocumentNumbers.contains(n);
}
public boolean hasDeletions() {
return getIndex().getDeletedDocuments().size() > 0 || deletedDocumentNumbers.size() > 0;
}
protected void doDelete(int docNum) throws IOException {
if (!getIndex().getDeletedDocuments().contains(docNum)) {
if (deletedDocumentNumbers.add(docNum)) {
deletedDocuments.add(getIndex().getDocumentsByNumber()[docNum]);
}
}
}
protected void doUndeleteAll() throws IOException {
deletedDocumentNumbers.clear();
deletedDocuments.clear();
}
protected void doCommit() throws IOException {
// todo: read/write lock
boolean updated = false;
// 1. update norms
if (updatedNormsByFieldNameAndDocumentNumber != null) {
for (Map.Entry> e : updatedNormsByFieldNameAndDocumentNumber.entrySet()) {
byte[] norms = getIndex().getNormsByFieldNameAndDocumentNumber().get(e.getKey());
for (NormUpdate normUpdate : e.getValue()) {
norms[normUpdate.doc] = normUpdate.value;
}
}
updatedNormsByFieldNameAndDocumentNumber = null;
updated = true;
}
// 2. remove deleted documents
if (deletedDocumentNumbers.size() > 0) {
for (Integer doc : deletedDocumentNumbers) {
getIndex().getDeletedDocuments().add(doc);
}
deletedDocumentNumbers.clear();
deletedDocuments.clear();
updated = true;
}
// todo unlock read/writelock
}
protected void doClose() throws IOException {
// ignored
// todo perhaps release all associated instances?
}
public Collection getFieldNames(FieldOption fieldOption) {
Set fieldSet = new HashSet();
for (FieldSetting fi : index.getFieldSettings().values()) {
if (fieldOption == IndexReader.FieldOption.ALL) {
fieldSet.add(fi.fieldName);
} else if (!fi.indexed && fieldOption == IndexReader.FieldOption.UNINDEXED) {
fieldSet.add(fi.fieldName);
} else if (fi.storePayloads && fieldOption == IndexReader.FieldOption.STORES_PAYLOADS) {
fieldSet.add(fi.fieldName);
} else if (fi.indexed && fieldOption == IndexReader.FieldOption.INDEXED) {
fieldSet.add(fi.fieldName);
} else if (fi.indexed && fi.storeTermVector == false && fieldOption == IndexReader.FieldOption.INDEXED_NO_TERMVECTOR) {
fieldSet.add(fi.fieldName);
} else if (fi.storeTermVector == true && fi.storePositionWithTermVector == false && fi.storeOffsetWithTermVector == false
&& fieldOption == IndexReader.FieldOption.TERMVECTOR) {
fieldSet.add(fi.fieldName);
} else if (fi.indexed && fi.storeTermVector && fieldOption == IndexReader.FieldOption.INDEXED_WITH_TERMVECTOR) {
fieldSet.add(fi.fieldName);
} else if (fi.storePositionWithTermVector && fi.storeOffsetWithTermVector == false
&& fieldOption == IndexReader.FieldOption.TERMVECTOR_WITH_POSITION) {
fieldSet.add(fi.fieldName);
} else if (fi.storeOffsetWithTermVector && fi.storePositionWithTermVector == false
&& fieldOption == IndexReader.FieldOption.TERMVECTOR_WITH_OFFSET) {
fieldSet.add(fi.fieldName);
} else if ((fi.storeOffsetWithTermVector && fi.storePositionWithTermVector)
&& fieldOption == IndexReader.FieldOption.TERMVECTOR_WITH_POSITION_OFFSET) {
fieldSet.add(fi.fieldName);
}
}
return fieldSet;
}
/**
* 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 canges of stored values,
* but be carful! 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#getFieldNames(org.apache.lucene.index.IndexReader.FieldOption)}
* 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
*/
public Document document(int n, FieldSelector fieldSelector) throws CorruptIndexException, IOException {
return document(n);
}
/**
* Returns the stored fields of the nth
* Document in this index.
*
* 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 canges of stored values,
* but be carful! 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#getFieldNames(org.apache.lucene.index.IndexReader.FieldOption)}
* out of sync, causing problems for instance when merging the
* instantiated index to another index.
*
* @throws CorruptIndexException if the index is corrupt
* @throws IOException if there is a low-level IO error
*/
public Document document(int n) throws IOException {
return isDeleted(n) ? null : getIndex().getDocumentsByNumber()[n].getDocument();
}
/**
* never ever touch these values. it is the true values, unless norms have
* been touched.
*/
public byte[] norms(String field) throws IOException {
byte[] norms = getIndex().getNormsByFieldNameAndDocumentNumber().get(field);
if (updatedNormsByFieldNameAndDocumentNumber != null) {
norms = norms.clone();
List updated = updatedNormsByFieldNameAndDocumentNumber.get(field);
if (updated != null) {
for (NormUpdate normUpdate : updated) {
norms[normUpdate.doc] = normUpdate.value;
}
}
}
return norms;
}
public void norms(String field, byte[] bytes, int offset) throws IOException {
byte[] norms = getIndex().getNormsByFieldNameAndDocumentNumber().get(field);
System.arraycopy(norms, 0, bytes, offset, norms.length);
}
protected void doSetNorm(int doc, String field, byte value) throws IOException {
if (updatedNormsByFieldNameAndDocumentNumber == null) {
updatedNormsByFieldNameAndDocumentNumber = new HashMap>(getIndex().getNormsByFieldNameAndDocumentNumber().size());
}
List list = updatedNormsByFieldNameAndDocumentNumber.get(field);
if (list == null) {
list = new LinkedList();
updatedNormsByFieldNameAndDocumentNumber.put(field, list);
}
list.add(new NormUpdate(doc, value));
}
public int docFreq(Term t) throws IOException {
InstantiatedTerm term = getIndex().findTerm(t);
if (term == null) {
return 0;
} else {
return term.getAssociatedDocuments().length;
}
}
public TermEnum terms() throws IOException {
return new InstantiatedTermEnum(this);
}
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);
}
}
public TermDocs termDocs() throws IOException {
return new InstantiatedTermDocs(this);
}
public TermPositions termPositions() throws IOException {
return new InstantiatedTermPositions(this);
}
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;
}
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);
}
}
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());
}
}
}
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());
}
}
}
}