/*
* Copyright 2004 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.
*/
using System;
using IndexReaderLucene.Net.Index.IndexReader;
using TermLucene.Net.Index.Term;
using TermDocsLucene.Net.Index.TermDocs;
using TermEnumLucene.Net.Index.TermEnum;
using StringIndexLucene.Net.Search.StringIndex;
namespace Lucene.Net.Search{
/// <summary> Expert: The default cache implementation, storing all values in memory.
/// A WeakHashMap is used for storage.
///
/// <p>Created: May 19, 2004 4:40:36 PM
///
/// </summary>
/// <author> Tim Jones (Nacimiento Software)
/// </author>
/// <since> lucene 1.4
/// </since>
/// <version> $Id: FieldCacheImpl.java 331964 2005-11-09 06:44:10Z otis $
/// </version>
class FieldCacheImpl : FieldCache
{
public class AnonymousClassIntParser : IntParser
{
public virtual int ParseInt(System.String value_Renamed)
{
return System.Int32.Parse(value_Renamed);
}
}
public class AnonymousClassFloatParser : FloatParser
{
public virtual float ParseFloat(System.String value_Renamed)
{
return System.Single.Parse(value_Renamed);
}
}
/// <summary>Expert: Every key in the internal cache is of this type. </summary>
internal class Entry
{
internal System.String field; // which Field
internal int type; // which SortField type
internal System.Object custom; // which custom comparator
/// <summary>Creates one of these objects. </summary>
internal Entry(System.String field, int type)
{
this.field = String.Intern(field);
this.type = type;
this.custom = null;
}
/// <summary>Creates one of these objects for a custom comparator. </summary>
internal Entry(System.String field, System.Object custom)
{
this.field = String.Intern(field);
this.type = SortField.CUSTOM;
this.custom = custom;
}
/// <summary>Two of these are equal iff they reference the same field and type. </summary>
public override bool Equals(System.Object o)
{
if (o is Entry)
{
Entry other = (Entry) o;
if (other.field == field && other.type == type)
{
if (other.custom == null)
{
if (custom == null)
return true;
}
else if (other.custom.Equals(custom))
{
return true;
}
}
}
return false;
}
/// <summary>Composes a hashcode based on the field and type. </summary>
public override int GetHashCode()
{
return field.GetHashCode() ^ type ^ (custom == null?0:custom.GetHashCode());
}
}
private static readonly IntParser INT_PARSER;
private static readonly FloatParser FLOAT_PARSER;
/// <summary>The internal cache. Maps Entry to array of interpreted term values. *</summary>
internal System.Collections.IDictionary cache = new System.Collections.Hashtable();
/// <summary>See if an object is in the cache. </summary>
internal virtual System.Object Lookup(IndexReader reader, System.String field, int type)
{
Entry entry = new Entry(field, type);
lock (this)
{
System.Collections.Hashtable readerCache = (System.Collections.Hashtable) cache[reader];
if (readerCache == null)
return null;
return readerCache[entry];
}
}
/// <summary>See if a custom object is in the cache. </summary>
internal virtual System.Object Lookup(IndexReader reader, System.String field, System.Object comparer)
{
Entry entry = new Entry(field, comparer);
lock (this)
{
System.Collections.Hashtable readerCache = (System.Collections.Hashtable) cache[reader];
if (readerCache == null)
return null;
return readerCache[entry];
}
}
/// <summary>Put an object into the cache. </summary>
internal virtual System.Object Store(IndexReader reader, System.String field, int type, System.Object value_Renamed)
{
Entry entry = new Entry(field, type);
lock (this)
{
System.Collections.Hashtable readerCache = (System.Collections.Hashtable) cache[reader];
if (readerCache == null)
{
readerCache = new System.Collections.Hashtable();
cache[reader] = readerCache;
}
System.Object tempObject;
tempObject = readerCache[entry];
readerCache[entry] = value_Renamed;
return tempObject;
}
}
/// <summary>Put a custom object into the cache. </summary>
internal virtual System.Object Store(IndexReader reader, System.String field, System.Object comparer, System.Object value_Renamed)
{
Entry entry = new Entry(field, comparer);
lock (this)
{
System.Collections.Hashtable readerCache = (System.Collections.Hashtable) cache[reader];
if (readerCache == null)
{
readerCache = new System.Collections.Hashtable();
cache[reader] = readerCache;
}
System.Object tempObject;
tempObject = readerCache[entry];
readerCache[entry] = value_Renamed;
return tempObject;
}
}
// inherit javadocs
public virtual int[] GetInts(IndexReader reader, System.String field)
{
return GetInts(reader, field, INT_PARSER);
}
// inherit javadocs
public virtual int[] GetInts(IndexReader reader, System.String field, IntParser parser)
{
field = String.Intern(field);
System.Object ret = Lookup(reader, field, parser);
if (ret == null)
{
int[] retArray = new int[reader.MaxDoc()];
if (retArray.Length > 0)
{
TermDocs termDocs = reader.TermDocs();
TermEnum termEnum = reader.Terms(new Term(field, ""));
try
{
if (termEnum.Term() == null)
{
throw new System.SystemException("no terms in field " + field);
}
do
{
Term term = termEnum.Term();
if (term.Field() != field)
break;
int termval = parser.ParseInt(term.Text());
termDocs.Seek(termEnum);
while (termDocs.Next())
{
retArray[termDocs.Doc()] = termval;
}
}
while (termEnum.Next());
}
finally
{
termDocs.Close();
termEnum.Close();
}
}
Store(reader, field, parser, retArray);
return retArray;
}
return (int[]) ret;
}
// inherit javadocs
public virtual float[] GetFloats(IndexReader reader, System.String field)
{
return GetFloats(reader, field, FLOAT_PARSER);
}
// inherit javadocs
public virtual float[] GetFloats(IndexReader reader, System.String field, FloatParser parser)
{
field = String.Intern(field);
System.Object ret = Lookup(reader, field, parser);
if (ret == null)
{
float[] retArray = new float[reader.MaxDoc()];
if (retArray.Length > 0)
{
TermDocs termDocs = reader.TermDocs();
TermEnum termEnum = reader.Terms(new Term(field, ""));
try
{
if (termEnum.Term() == null)
{
throw new System.SystemException("no terms in field " + field);
}
do
{
Term term = termEnum.Term();
if (term.Field() != field)
break;
float termval = parser.ParseFloat(term.Text());
termDocs.Seek(termEnum);
while (termDocs.Next())
{
retArray[termDocs.Doc()] = termval;
}
}
while (termEnum.Next());
}
finally
{
termDocs.Close();
termEnum.Close();
}
}
Store(reader, field, parser, retArray);
return retArray;
}
return (float[]) ret;
}
// inherit javadocs
public virtual System.String[] GetStrings(IndexReader reader, System.String field)
{
field = String.Intern(field);
System.Object ret = Lookup(reader, field, SortField.STRING);
if (ret == null)
{
System.String[] retArray = new System.String[reader.MaxDoc()];
if (retArray.Length > 0)
{
TermDocs termDocs = reader.TermDocs();
TermEnum termEnum = reader.Terms(new Term(field, ""));
try
{
if (termEnum.Term() == null)
{
throw new System.SystemException("no terms in field " + field);
}
do
{
Term term = termEnum.Term();
if (term.Field() != field)
break;
System.String termval = term.Text();
termDocs.Seek(termEnum);
while (termDocs.Next())
{
retArray[termDocs.Doc()] = termval;
}
}
while (termEnum.Next());
}
finally
{
termDocs.Close();
termEnum.Close();
}
}
Store(reader, field, SortField.STRING, retArray);
return retArray;
}
return (System.String[]) ret;
}
// inherit javadocs
public virtual StringIndex GetStringIndex(IndexReader reader, System.String field)
{
field = String.Intern(field);
System.Object ret = Lookup(reader, field, Lucene.Net.Search.FieldCache_Fields.STRING_INDEX);
if (ret == null)
{
int[] retArray = new int[reader.MaxDoc()];
System.String[] mterms = new System.String[reader.MaxDoc() + 1];
if (retArray.Length > 0)
{
TermDocs termDocs = reader.TermDocs();
TermEnum termEnum = reader.Terms(new Term(field, ""));
int t = 0; // current term number
// an entry for documents that have no terms in this field
// should a document with no terms be at top or bottom?
// this puts them at the top - if it is changed, FieldDocSortedHitQueue
// needs to change as well.
mterms[t++] = null;
try
{
if (termEnum.Term() == null)
{
throw new System.SystemException("no terms in field " + field);
}
do
{
Term term = termEnum.Term();
if (term.Field() != field)
break;
// store term text
// we expect that there is at most one term per document
if (t >= mterms.Length)
throw new System.SystemException("there are more terms than " + "documents in field \"" + field + "\", but it's impossible to sort on " + "tokenized fields");
mterms[t] = term.Text();
termDocs.Seek(termEnum);
while (termDocs.Next())
{
retArray[termDocs.Doc()] = t;
}
t++;
}
while (termEnum.Next());
}
finally
{
termDocs.Close();
termEnum.Close();
}
if (t == 0)
{
// if there are no terms, make the term array
// have a single null entry
mterms = new System.String[1];
}
else if (t < mterms.Length)
{
// if there are less terms than documents,
// trim off the dead array space
System.String[] terms = new System.String[t];
Array.Copy(mterms, 0, terms, 0, t);
mterms = terms;
}
}
StringIndex value_Renamed = new StringIndex(retArray, mterms);
Store(reader, field, Lucene.Net.Search.FieldCache_Fields.STRING_INDEX, value_Renamed);
return value_Renamed;
}
return (StringIndex) ret;
}
/// <summary>The pattern used to detect integer values in a field </summary>
/// <summary>removed for java 1.3 compatibility
/// protected static final Pattern pIntegers = Pattern.compile ("[0-9\\-]+");
///
/// </summary>
/// <summary>The pattern used to detect float values in a field </summary>
/// <summary> removed for java 1.3 compatibility
/// protected static final Object pFloats = Pattern.compile ("[0-9+\\-\\.eEfFdD]+");
/// </summary>
// inherit javadocs
public virtual System.Object GetAuto(IndexReader reader, System.String field)
{
field = String.Intern(field);
System.Object ret = Lookup(reader, field, SortField.AUTO);
if (ret == null)
{
TermEnum enumerator = reader.Terms(new Term(field, ""));
try
{
Term term = enumerator.Term();
if (term == null)
{
throw new System.SystemException("no terms in field " + field + " - cannot determine sort type");
}
if (term.Field() == field)
{
System.String termtext = term.Text().Trim();
/**
* Java 1.4 level code:
if (pIntegers.matcher(termtext).matches())
return IntegerSortedHitQueue.comparator (reader, enumerator, field);
else if (pFloats.matcher(termtext).matches())
return FloatSortedHitQueue.comparator (reader, enumerator, field);
*/
// Java 1.3 level code:
try
{
System.Int32.Parse(termtext);
ret = GetInts(reader, field);
}
catch (System.FormatException nfe1)
{
try
{
System.Single.Parse(termtext);
ret = GetFloats(reader, field);
}
catch (System.FormatException nfe2)
{
ret = GetStringIndex(reader, field);
}
}
if (ret != null)
{
Store(reader, field, SortField.AUTO, ret);
}
}
else
{
throw new System.SystemException("field \"" + field + "\" does not appear to be indexed");
}
}
finally
{
enumerator.Close();
}
}
return ret;
}
// inherit javadocs
public virtual System.IComparable[] GetCustom(IndexReader reader, System.String field, SortComparator comparator)
{
field = String.Intern(field);
System.Object ret = Lookup(reader, field, comparator);
if (ret == null)
{
System.IComparable[] retArray = new System.IComparable[reader.MaxDoc()];
if (retArray.Length > 0)
{
TermDocs termDocs = reader.TermDocs();
TermEnum termEnum = reader.Terms(new Term(field, ""));
try
{
if (termEnum.Term() == null)
{
throw new System.SystemException("no terms in field " + field);
}
do
{
Term term = termEnum.Term();
if (term.Field() != field)
break;
System.IComparable termval = comparator.GetComparable(term.Text());
termDocs.Seek(termEnum);
while (termDocs.Next())
{
retArray[termDocs.Doc()] = termval;
}
}
while (termEnum.Next());
}
finally
{
termDocs.Close();
termEnum.Close();
}
}
Store(reader, field, comparator, retArray);
return retArray;
}
return (System.IComparable[]) ret;
}
static FieldCacheImpl()
{
INT_PARSER = new AnonymousClassIntParser();
FLOAT_PARSER = new AnonymousClassFloatParser();
}
}
}
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