package org.apache.lucene.queries.function.valuesource;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.index.Term;
import org.apache.lucene.queries.function.FunctionValues;
import org.apache.lucene.queries.function.ValueSource;
import org.apache.lucene.queries.function.docvalues.DoubleDocValues;
import org.apache.lucene.queries.function.docvalues.IntDocValues;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.util.BytesRef;
import java.io.IOException;
import java.util.Map;
class ConstIntDocValues extends IntDocValues {
final int ival;
final float fval;
final double dval;
final long lval;
final String sval;
final ValueSource parent;
ConstIntDocValues(int val, ValueSource parent) {
super(parent);
ival = val;
fval = val;
dval = val;
lval = val;
sval = Integer.toString(val);
this.parent = parent;
}
@Override
public float floatVal(int doc) {
return fval;
}
@Override
public int intVal(int doc) {
return ival;
}
@Override
public long longVal(int doc) {
return lval;
}
@Override
public double doubleVal(int doc) {
return dval;
}
@Override
public String strVal(int doc) {
return sval;
}
@Override
public String toString(int doc) {
return parent.description() + '=' + sval;
}
}
class ConstDoubleDocValues extends DoubleDocValues {
final int ival;
final float fval;
final double dval;
final long lval;
final String sval;
final ValueSource parent;
ConstDoubleDocValues(double val, ValueSource parent) {
super(parent);
ival = (int)val;
fval = (float)val;
dval = val;
lval = (long)val;
sval = Double.toString(val);
this.parent = parent;
}
@Override
public float floatVal(int doc) {
return fval;
}
@Override
public int intVal(int doc) {
return ival;
}
@Override
public long longVal(int doc) {
return lval;
}
@Override
public double doubleVal(int doc) {
return dval;
}
@Override
public String strVal(int doc) {
return sval;
}
@Override
public String toString(int doc) {
return parent.description() + '=' + sval;
}
}
public class DocFreqValueSource extends ValueSource {
protected final String field;
protected final String indexedField;
protected final String val;
protected final BytesRef indexedBytes;
public DocFreqValueSource(String field, String val, String indexedField, BytesRef indexedBytes) {
this.field = field;
this.val = val;
this.indexedField = indexedField;
this.indexedBytes = indexedBytes;
}
public String name() {
return "docfreq";
}
@Override
public String description() {
return name() + '(' + field + ',' + val + ')';
}
@Override
public FunctionValues getValues(Map context, LeafReaderContext readerContext) throws IOException {
IndexSearcher searcher = (IndexSearcher)context.get("searcher");
int docfreq = searcher.getIndexReader().docFreq(new Term(indexedField, indexedBytes));
return new ConstIntDocValues(docfreq, this);
}
@Override
public void createWeight(Map context, IndexSearcher searcher) throws IOException {
context.put("searcher",searcher);
}
@Override
public int hashCode() {
return getClass().hashCode() + indexedField.hashCode()*29 + indexedBytes.hashCode();
}
@Override
public boolean equals(Object o) {
if (this.getClass() != o.getClass()) return false;
DocFreqValueSource other = (DocFreqValueSource)o;
return this.indexedField.equals(other.indexedField) && this.indexedBytes.equals(other.indexedBytes);
}
}