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compositeReader.go
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compositeReader.go
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package index
import (
"bytes"
"container/list"
"fmt"
. "github.com/gzg1984/golucene/core/codec/spi"
"reflect"
)
type CompositeReaderSPI interface {
getSequentialSubReaders() []IndexReader
}
type CompositeReader interface {
IndexReader
CompositeReaderSPI
}
type CompositeReaderImpl struct {
*IndexReaderImpl
CompositeReaderSPI
readerContext *CompositeReaderContext // lazy load
}
func newCompositeReader(spi CompositeReaderSPI, self IndexReaderImplSPI) *CompositeReaderImpl {
return &CompositeReaderImpl{
IndexReaderImpl: newIndexReader(self),
CompositeReaderSPI: spi,
}
}
func (r *CompositeReaderImpl) String() string {
var buf bytes.Buffer
class := reflect.TypeOf(r.IndexReaderImplSPI).Name()
if class != "" {
buf.WriteString(class)
} else {
buf.WriteString("CompositeReader")
}
buf.WriteString("(")
subReaders := r.getSequentialSubReaders()
if len(subReaders) > 0 {
fmt.Fprintf(&buf, "%v", subReaders[0])
for i, v := range subReaders {
if i > 0 {
fmt.Fprintf(&buf, " %v", v)
}
}
}
buf.WriteString(")")
return buf.String()
}
func (r *CompositeReaderImpl) Context() IndexReaderContext {
r.ensureOpen()
// lazy init without thread safety for perf reasons: Building the readerContext twice does not hurt!
if r.readerContext == nil {
// log.Print("Obtaining context for: ", r)
// assert getSequentialSubReaders() != null;
r.readerContext = newCompositeReaderContext(r)
}
return r.readerContext
}
type CompositeReaderContext struct {
*IndexReaderContextImpl
children []IndexReaderContext
leaves *list.List // operated by builder
reader CompositeReader
}
func newCompositeReaderContext(r CompositeReader) *CompositeReaderContext {
return newCompositeReaderContextBuilder(r).build()
}
func newCompositeReaderContext3(reader CompositeReader,
children []IndexReaderContext, leaves *list.List) *CompositeReaderContext {
return newCompositeReaderContext6(nil, reader, 0, 0, children, leaves)
}
func newCompositeReaderContext5(parent *CompositeReaderContext, reader CompositeReader,
ordInParent, docBaseInParent int, children []IndexReaderContext) *CompositeReaderContext {
return newCompositeReaderContext6(parent, reader, ordInParent, docBaseInParent, children, list.New())
}
func newCompositeReaderContext6(parent *CompositeReaderContext,
reader CompositeReader,
ordInParent, docBaseInParent int,
children []IndexReaderContext,
leaves *list.List) *CompositeReaderContext {
ans := &CompositeReaderContext{}
ans.IndexReaderContextImpl = newIndexReaderContext(parent, ordInParent, docBaseInParent)
ans.children = children
ans.leaves = leaves
ans.reader = reader
return ans
}
func (ctx *CompositeReaderContext) Leaves() []*AtomicReaderContext {
assert2(ctx.isTopLevel, "This is not a top-level context.")
assert(ctx.leaves != nil)
ans := make([]*AtomicReaderContext, 0, ctx.leaves.Len())
for e := ctx.leaves.Front(); e != nil; e = e.Next() {
ans = append(ans, e.Value.(*AtomicReaderContext))
}
return ans
}
func (ctx *CompositeReaderContext) Children() []IndexReaderContext {
return ctx.children
}
func (ctx *CompositeReaderContext) Reader() IndexReader {
return ctx.reader
}
func (ctx *CompositeReaderContext) String() string {
return fmt.Sprintf("CompositeReaderContext{%v %v %v}",
ctx.IndexReaderContextImpl, ctx.children, ctx.reader)
}
type CompositeReaderContextBuilder struct {
reader CompositeReader
leaves *list.List
leafDocBase int
}
func newCompositeReaderContextBuilder(r CompositeReader) CompositeReaderContextBuilder {
return CompositeReaderContextBuilder{reader: r, leaves: list.New()}
}
func (b CompositeReaderContextBuilder) build() *CompositeReaderContext {
return b.build4(nil, b.reader, 0, 0).(*CompositeReaderContext)
}
func (b CompositeReaderContextBuilder) build4(parent *CompositeReaderContext,
reader IndexReader, ord, docBase int) IndexReaderContext {
// log.Printf("Building context from %v(parent: %v, %v-%v)", reader, parent, ord, docBase)
if ar, ok := reader.(AtomicReader); ok {
// log.Print("AtomicReader is detected.")
atomic := newAtomicReaderContext(parent, ar, ord, docBase, b.leaves.Len(), b.leafDocBase)
b.leaves.PushBack(atomic)
b.leafDocBase += reader.MaxDoc()
return atomic
}
// log.Print("CompositeReader is detected: ", reader)
cr := reader.(CompositeReader)
sequentialSubReaders := cr.getSequentialSubReaders()
// log.Printf("Found %v sub readers.", len(sequentialSubReaders))
children := make([]IndexReaderContext, len(sequentialSubReaders))
var newParent *CompositeReaderContext
if parent == nil {
newParent = newCompositeReaderContext3(cr, children, b.leaves)
} else {
newParent = newCompositeReaderContext5(parent, cr, ord, docBase, children)
}
newDocBase := 0
for i, r := range sequentialSubReaders {
children[i] = b.build4(newParent, r, i, newDocBase)
newDocBase = r.MaxDoc()
}
// assert newDocBase == cr.maxDoc()
return newParent
}
var (
EMPTY_ARRAY = []ReaderSlice{}
)
type ReaderSlice struct {
start, length, readerIndex int
}
func (rs ReaderSlice) String() string {
return fmt.Sprintf("slice start=%v length=%v readerIndex=%v", rs.start, rs.length, rs.readerIndex)
}
type BaseCompositeReaderSPI interface {
IndexReaderImplSPI
CompositeReaderSPI
}
type BaseCompositeReader struct {
*CompositeReaderImpl
subReaders []IndexReader
starts []int
maxDoc int
numDocs int
subReadersList []IndexReader
}
func newBaseCompositeReader(spi BaseCompositeReaderSPI, readers []IndexReader) *BaseCompositeReader {
// log.Printf("Initializing BaseCompositeReader with %v IndexReaders", len(readers))
ans := &BaseCompositeReader{}
ans.CompositeReaderImpl = newCompositeReader(spi, spi)
ans.subReaders = readers
ans.subReadersList = make([]IndexReader, len(readers))
copy(ans.subReadersList, readers)
ans.starts = make([]int, len(readers)+1) // build starts array
var maxDoc, numDocs int
for i, r := range readers {
ans.starts[i] = maxDoc
maxDoc += r.MaxDoc() // compute maxDocs
if maxDoc < 0 || maxDoc > actualMaxDocs { // overflow
panic(fmt.Sprintf(
"Too many documents, composite IndexReaders cannot exceed %v",
actualMaxDocs))
}
numDocs += r.NumDocs() // compute numDocs
// log.Printf("Obtained %v docs (max %v)", numDocs, maxDoc)
r.registerParentReader(ans)
}
ans.starts[len(readers)] = maxDoc
ans.maxDoc = maxDoc
ans.numDocs = numDocs
// log.Print("Success")
return ans
}
func (r *BaseCompositeReader) TermVectors(docID int) error {
panic("not implemented yet")
// r.ensureOpen()
// i := readerIndex(docID)
// return r.subReaders[i].TermVectors(docID - starts[i])
}
func (r *BaseCompositeReader) NumDocs() int {
// Don't call ensureOpen() here (it could affect performance)
return r.numDocs
}
func (r *BaseCompositeReader) MaxDoc() int {
// Don't call ensureOpen() here (it could affect performance)
return r.maxDoc
}
func (r *BaseCompositeReader) VisitDocument(docID int, visitor StoredFieldVisitor) error {
r.ensureOpen()
i := r.readerIndex(docID) // find subreader num
return r.subReaders[i].VisitDocument(docID-r.starts[i], visitor)
}
func (r *BaseCompositeReader) DocFreq(term *Term) (int, error) {
panic("not implemented yet")
}
func (r *BaseCompositeReader) TotalTermFreq(term *Term) int64 {
panic("not implemented yet")
}
func (r *BaseCompositeReader) SumDocFreq(field string) int64 {
panic("not implemented yet")
}
func (r *BaseCompositeReader) DocCount(field string) int {
panic("not implemented yet")
}
func (r *BaseCompositeReader) SumTotalTermFreq(field string) int64 {
panic("not implemented yet")
}
func (r *BaseCompositeReader) readerIndex(docID int) int {
if docID < 0 || docID >= r.maxDoc {
panic(fmt.Sprintf("docID must be [0, %v] (got docID=%v)", r.maxDoc, docID))
}
return subIndex(docID, r.starts)
}
func (r *BaseCompositeReader) readerBase(readerIndex int) int {
panic("not implemented yet")
}
func (r *BaseCompositeReader) getSequentialSubReaders() []IndexReader {
// log.Printf("Found %v sub readers.", len(r.subReadersList))
return r.subReadersList
}