| /* |
| * 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. |
| */ |
| package org.apache.lucene.queries.function.valuesource; |
| |
| import java.io.IOException; |
| import java.util.Map; |
| |
| import org.apache.lucene.index.BinaryDocValues; |
| import org.apache.lucene.index.DocValues; |
| import org.apache.lucene.index.DocValuesType; |
| import org.apache.lucene.index.FieldInfo; |
| import org.apache.lucene.index.LeafReaderContext; |
| import org.apache.lucene.queries.function.FunctionValues; |
| import org.apache.lucene.queries.function.docvalues.DocTermsIndexDocValues; |
| import org.apache.lucene.util.BytesRef; |
| import org.apache.lucene.util.BytesRefBuilder; |
| import org.apache.lucene.util.mutable.MutableValue; |
| import org.apache.lucene.util.mutable.MutableValueStr; |
| |
| /** |
| * An implementation for retrieving {@link FunctionValues} instances for string based fields. |
| */ |
| public class BytesRefFieldSource extends FieldCacheSource { |
| |
| public BytesRefFieldSource(String field) { |
| super(field); |
| } |
| |
| @Override |
| public FunctionValues getValues(Map context, LeafReaderContext readerContext) throws IOException { |
| final FieldInfo fieldInfo = readerContext.reader().getFieldInfos().fieldInfo(field); |
| |
| // To be sorted or not to be sorted, that is the question |
| // TODO: do it cleaner? |
| if (fieldInfo != null && fieldInfo.getDocValuesType() == DocValuesType.BINARY) { |
| final BinaryDocValues binaryValues = DocValues.getBinary(readerContext.reader(), field); |
| return new FunctionValues() { |
| int lastDocID = -1; |
| |
| private BytesRef getValueForDoc(int doc) throws IOException { |
| if (doc < lastDocID) { |
| throw new IllegalArgumentException("docs were sent out-of-order: lastDocID=" + lastDocID + " vs docID=" + doc); |
| } |
| lastDocID = doc; |
| int curDocID = binaryValues.docID(); |
| if (doc > curDocID) { |
| curDocID = binaryValues.advance(doc); |
| } |
| if (doc == curDocID) { |
| return binaryValues.binaryValue(); |
| } else { |
| return null; |
| } |
| } |
| |
| @Override |
| public boolean exists(int doc) throws IOException { |
| return getValueForDoc(doc) != null; |
| } |
| |
| @Override |
| public boolean bytesVal(int doc, BytesRefBuilder target) throws IOException { |
| BytesRef value = getValueForDoc(doc); |
| if (value == null || value.length == 0) { |
| return false; |
| } else { |
| target.copyBytes(value); |
| return true; |
| } |
| } |
| |
| public String strVal(int doc) throws IOException { |
| final BytesRefBuilder bytes = new BytesRefBuilder(); |
| return bytesVal(doc, bytes) |
| ? bytes.get().utf8ToString() |
| : null; |
| } |
| |
| @Override |
| public Object objectVal(int doc) throws IOException { |
| return strVal(doc); |
| } |
| |
| @Override |
| public String toString(int doc) throws IOException { |
| return description() + '=' + strVal(doc); |
| } |
| |
| @Override |
| public ValueFiller getValueFiller() { |
| return new ValueFiller() { |
| private final MutableValueStr mval = new MutableValueStr(); |
| |
| @Override |
| public MutableValue getValue() { |
| return mval; |
| } |
| |
| @Override |
| public void fillValue(int doc) throws IOException { |
| BytesRef value = getValueForDoc(doc); |
| mval.exists = value != null; |
| mval.value.clear(); |
| if (value != null) { |
| mval.value.copyBytes(value); |
| } |
| } |
| }; |
| } |
| |
| }; |
| } else { |
| return new DocTermsIndexDocValues(this, readerContext, field) { |
| |
| @Override |
| protected String toTerm(String readableValue) { |
| return readableValue; |
| } |
| |
| @Override |
| public Object objectVal(int doc) throws IOException { |
| return strVal(doc); |
| } |
| |
| @Override |
| public String toString(int doc) throws IOException { |
| return description() + '=' + strVal(doc); |
| } |
| }; |
| } |
| } |
| } |