package org.apache.solr.schema;
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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.
*/
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.lang.reflect.Constructor;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.StorableField;
import org.apache.lucene.index.FieldInfo.IndexOptions;
import org.apache.lucene.search.SortField;
import org.apache.lucene.util.AttributeSource;
import org.apache.lucene.util.AttributeSource.State;
import org.apache.solr.analysis.SolrAnalyzer;
import org.apache.solr.response.TextResponseWriter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Pre-analyzed field type provides a way to index a serialized token stream,
* optionally with an independent stored value of a field.
*/
public class PreAnalyzedField extends FieldType {
private static final Logger LOG = LoggerFactory.getLogger(PreAnalyzedField.class);
/** Init argument name. Value is a fully-qualified class name of the parser
* that implements {@link PreAnalyzedParser}.
*/
public static final String PARSER_IMPL = "parserImpl";
private static final String DEFAULT_IMPL = JsonPreAnalyzedParser.class.getName();
private PreAnalyzedParser parser;
@Override
public void init(IndexSchema schema, Map<String, String> args) {
super.init(schema, args);
String implName = args.get(PARSER_IMPL);
if (implName == null) {
parser = new JsonPreAnalyzedParser();
} else {
// short name
if ("json".equalsIgnoreCase(implName)) {
parser = new JsonPreAnalyzedParser();
} else if ("simple".equalsIgnoreCase(implName)) {
parser = new SimplePreAnalyzedParser();
} else {
try {
Class<? extends PreAnalyzedParser> implClazz = schema.getResourceLoader().findClass(implName, PreAnalyzedParser.class);
Constructor<?> c = implClazz.getConstructor(new Class<?>[0]);
parser = (PreAnalyzedParser) c.newInstance(new Object[0]);
} catch (Exception e) {
LOG.warn("Can't use the configured PreAnalyzedParser class '" + implName +
"', using default " + DEFAULT_IMPL, e);
parser = new JsonPreAnalyzedParser();
}
}
}
}
@Override
public Analyzer getAnalyzer() {
return new SolrAnalyzer() {
@Override
protected TokenStreamComponents createComponents(String fieldName) {
return new TokenStreamComponents(new PreAnalyzedTokenizer(parser));
}
};
}
@Override
public Analyzer getQueryAnalyzer() {
return getAnalyzer();
}
@Override
public StorableField createField(SchemaField field, Object value,
float boost) {
StorableField f = null;
try {
f = fromString(field, String.valueOf(value), boost);
} catch (Exception e) {
LOG.warn("Error parsing pre-analyzed field '" + field.getName() + "'", e);
return null;
}
return f;
}
@Override
public SortField getSortField(SchemaField field, boolean top) {
return getStringSort(field, top);
}
@Override
public void write(TextResponseWriter writer, String name, StorableField f)
throws IOException {
writer.writeStr(name, f.stringValue(), true);
}
/** Utility method to convert a field to a string that is parse-able by this
* class.
* @param f field to convert
* @return string that is compatible with the serialization format
* @throws IOException If there is a low-level I/O error.
*/
public String toFormattedString(Field f) throws IOException {
return parser.toFormattedString(f);
}
/**
* Utility method to create a {@link org.apache.lucene.document.FieldType}
* based on the {@link SchemaField}
*/
public static org.apache.lucene.document.FieldType createFieldType(SchemaField field) {
if (!field.indexed() && !field.stored()) {
if (log.isTraceEnabled())
log.trace("Ignoring unindexed/unstored field: " + field);
return null;
}
org.apache.lucene.document.FieldType newType = new org.apache.lucene.document.FieldType();
newType.setIndexed(field.indexed());
newType.setTokenized(field.isTokenized());
newType.setStored(field.stored());
newType.setOmitNorms(field.omitNorms());
IndexOptions options = IndexOptions.DOCS_AND_FREQS_AND_POSITIONS;
if (field.omitTermFreqAndPositions()) {
options = IndexOptions.DOCS_ONLY;
} else if (field.omitPositions()) {
options = IndexOptions.DOCS_AND_FREQS;
} else if (field.storeOffsetsWithPositions()) {
options = IndexOptions.DOCS_AND_FREQS_AND_POSITIONS_AND_OFFSETS;
}
newType.setIndexOptions(options);
newType.setStoreTermVectors(field.storeTermVector());
newType.setStoreTermVectorOffsets(field.storeTermOffsets());
newType.setStoreTermVectorPositions(field.storeTermPositions());
return newType;
}
/**
* This is a simple holder of a stored part and the collected states (tokens with attributes).
*/
public static class ParseResult {
public String str;
public byte[] bin;
public List<State> states = new LinkedList<>();
}
/**
* Parse the input and return the stored part and the tokens with attributes.
*/
public static interface PreAnalyzedParser {
/**
* Parse input.
* @param reader input to read from
* @param parent parent who will own the resulting states (tokens with attributes)
* @return parse result, with possibly null stored and/or states fields.
* @throws IOException if a parsing error or IO error occurs
*/
public ParseResult parse(Reader reader, AttributeSource parent) throws IOException;
/**
* Format a field so that the resulting String is valid for parsing with {@link #parse(Reader, AttributeSource)}.
* @param f field instance
* @return formatted string
* @throws IOException If there is a low-level I/O error.
*/
public String toFormattedString(Field f) throws IOException;
}
public StorableField fromString(SchemaField field, String val, float boost) throws Exception {
if (val == null || val.trim().length() == 0) {
return null;
}
PreAnalyzedTokenizer parse = new PreAnalyzedTokenizer(parser);
parse.setReader(new StringReader(val));
parse.reset(); // consume
org.apache.lucene.document.FieldType type = createFieldType(field);
if (type == null) {
parse.close();
return null;
}
Field f = null;
if (parse.getStringValue() != null) {
if (field.stored()) {
f = new Field(field.getName(), parse.getStringValue(), type);
} else {
type.setStored(false);
}
} else if (parse.getBinaryValue() != null) {
if (field.isBinary()) {
f = new Field(field.getName(), parse.getBinaryValue(), type);
}
} else {
type.setStored(false);
}
if (parse.hasTokenStream()) {
if (field.indexed()) {
type.setIndexed(true);
type.setTokenized(true);
if (f != null) {
f.setTokenStream(parse);
} else {
f = new Field(field.getName(), parse, type);
}
} else {
if (f != null) {
f.fieldType().setIndexed(false);
f.fieldType().setTokenized(false);
}
}
}
if (f != null) {
f.setBoost(boost);
}
return f;
}
/**
* Token stream that works from a list of saved states.
*/
private static class PreAnalyzedTokenizer extends Tokenizer {
private final List<AttributeSource.State> cachedStates = new LinkedList<>();
private Iterator<AttributeSource.State> it = null;
private String stringValue = null;
private byte[] binaryValue = null;
private PreAnalyzedParser parser;
public PreAnalyzedTokenizer(PreAnalyzedParser parser) {
this.parser = parser;
}
public boolean hasTokenStream() {
return !cachedStates.isEmpty();
}
public String getStringValue() {
return stringValue;
}
public byte[] getBinaryValue() {
return binaryValue;
}
@Override
public final boolean incrementToken() {
// lazy init the iterator
if (it == null) {
it = cachedStates.iterator();
}
if (!it.hasNext()) {
return false;
}
AttributeSource.State state = (State) it.next();
restoreState(state.clone());
return true;
}
@Override
public final void reset() throws IOException {
// NOTE: this acts like rewind if you call it again
if (it == null) {
super.reset();
cachedStates.clear();
stringValue = null;
binaryValue = null;
ParseResult res = parser.parse(input, this);
if (res != null) {
stringValue = res.str;
binaryValue = res.bin;
if (res.states != null) {
cachedStates.addAll(res.states);
}
}
}
it = cachedStates.iterator();
}
}
}