BufferedIndexInput.h

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// Copyright (c) 2009-2014 Alan Wright. All rights reserved.
// Distributable under the terms of either the Apache License (Version 2.0)
// or the GNU Lesser General Public License.
 
#ifndef BUFFEREDINDEXINPUT_H
#define BUFFEREDINDEXINPUT_H
 
#include "IndexInput.h"
 
namespace Lucene {

class LPPAPI BufferedIndexInput : public IndexInput {
public:
    BufferedIndexInput(int32_t bufferSize = BUFFER_SIZE);
    virtual ~BufferedIndexInput();
 
    LUCENE_CLASS(BufferedIndexInput);
 
public:
    static const int32_t BUFFER_SIZE;
 
protected:
    int32_t bufferSize;
    int64_t bufferStart; // position in file of buffer
    int32_t bufferLength; // end of valid bytes
    int32_t bufferPosition; // next byte to read
    ByteArray buffer;
    decltype(buffer.get()) __buffer;
 
public:
    virtual uint8_t readByte();

    virtual int32_t readVInt();

    void setBufferSize(int32_t newSize);

    int32_t getBufferSize();

    virtual void readBytes(uint8_t* b, int32_t offset, int32_t length);

    virtual void readBytes(uint8_t* b, int32_t offset, int32_t length, bool useBuffer);

    virtual void close();

    virtual int64_t getFilePointer();

    virtual void seek(int64_t pos);

    virtual LuceneObjectPtr clone(const LuceneObjectPtr& other = LuceneObjectPtr());
 
protected:
    virtual void newBuffer(ByteArray newBuffer);
 
    void checkBufferSize(int32_t bufferSize);

    virtual void refill();

    virtual void readInternal(uint8_t* b, int32_t offset, int32_t length) = 0;

    virtual void seekInternal(int64_t pos) = 0;
};
 
}
 
#endif