/*
* 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.search.lookup;
import com.google.common.collect.ImmutableMap;
import org.apache.lucene.index.LeafReader;
import org.apache.lucene.index.LeafReaderContext;
import org.elasticsearch.ElasticsearchParseException;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.collect.Tuple;
import org.elasticsearch.common.xcontent.XContentHelper;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.common.xcontent.support.XContentMapValues;
import org.elasticsearch.index.fieldvisitor.JustSourceFieldsVisitor;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
*
*/
public class SourceLookup implements Map {
private LeafReader reader;
private int docId = -1;
private BytesReference sourceAsBytes;
private Map<String, Object> source;
private XContentType sourceContentType;
public Map<String, Object> source() {
return source;
}
public XContentType sourceContentType() {
return sourceContentType;
}
private Map<String, Object> loadSourceIfNeeded() {
if (source != null) {
return source;
}
if (sourceAsBytes != null) {
Tuple<XContentType, Map<String, Object>> tuple = sourceAsMapAndType(sourceAsBytes);
sourceContentType = tuple.v1();
source = tuple.v2();
return source;
}
try {
JustSourceFieldsVisitor sourceFieldVisitor = new JustSourceFieldsVisitor();
reader.document(docId, sourceFieldVisitor);
BytesReference source = sourceFieldVisitor.source();
if (source == null) {
this.source = ImmutableMap.of();
this.sourceContentType = null;
} else {
Tuple<XContentType, Map<String, Object>> tuple = sourceAsMapAndType(source);
this.sourceContentType = tuple.v1();
this.source = tuple.v2();
}
} catch (Exception e) {
throw new ElasticsearchParseException("failed to parse / load source", e);
}
return this.source;
}
public static Tuple<XContentType, Map<String, Object>> sourceAsMapAndType(BytesReference source) throws ElasticsearchParseException {
return XContentHelper.convertToMap(source, false);
}
public static Map<String, Object> sourceAsMap(BytesReference source) throws ElasticsearchParseException {
return sourceAsMapAndType(source).v2();
}
public static Tuple<XContentType, Map<String, Object>> sourceAsMapAndType(byte[] bytes, int offset, int length) throws ElasticsearchParseException {
return XContentHelper.convertToMap(bytes, offset, length, false);
}
public static Map<String, Object> sourceAsMap(byte[] bytes, int offset, int length) throws ElasticsearchParseException {
return sourceAsMapAndType(bytes, offset, length).v2();
}
public void setNextReader(LeafReaderContext context) {
if (this.reader == context.reader()) { // if we are called with the same reader, don't invalidate source
return;
}
this.reader = context.reader();
this.source = null;
this.sourceAsBytes = null;
this.docId = -1;
}
public void setNextDocId(int docId) {
if (this.docId == docId) { // if we are called with the same docId, don't invalidate source
return;
}
this.docId = docId;
this.sourceAsBytes = null;
this.source = null;
}
public void setNextSource(BytesReference source) {
this.sourceAsBytes = source;
}
public void setNextSourceContentType(XContentType sourceContentType) {
this.sourceContentType = sourceContentType;
}
public void setNextSource(Map<String, Object> source) {
this.source = source;
}
/**
* Internal source representation, might be compressed....
*/
public BytesReference internalSourceRef() {
return sourceAsBytes;
}
/**
* Returns the values associated with the path. Those are "low" level values, and it can
* handle path expression where an array/list is navigated within.
*/
public List<Object> extractRawValues(String path) {
return XContentMapValues.extractRawValues(path, loadSourceIfNeeded());
}
public Object filter(String[] includes, String[] excludes) {
return XContentMapValues.filter(loadSourceIfNeeded(), includes, excludes);
}
public Object extractValue(String path) {
return XContentMapValues.extractValue(path, loadSourceIfNeeded());
}
@Override
public Object get(Object key) {
return loadSourceIfNeeded().get(key);
}
@Override
public int size() {
return loadSourceIfNeeded().size();
}
@Override
public boolean isEmpty() {
return loadSourceIfNeeded().isEmpty();
}
@Override
public boolean containsKey(Object key) {
return loadSourceIfNeeded().containsKey(key);
}
@Override
public boolean containsValue(Object value) {
return loadSourceIfNeeded().containsValue(value);
}
@Override
public Set keySet() {
return loadSourceIfNeeded().keySet();
}
@Override
public Collection values() {
return loadSourceIfNeeded().values();
}
@Override
public Set entrySet() {
return loadSourceIfNeeded().entrySet();
}
@Override
public Object put(Object key, Object value) {
throw new UnsupportedOperationException();
}
@Override
public Object remove(Object key) {
throw new UnsupportedOperationException();
}
@Override
public void putAll(Map m) {
throw new UnsupportedOperationException();
}
@Override
public void clear() {
throw new UnsupportedOperationException();
}
}