ByteBuffersIndexInput (Lucene 8.9.0 API)乐学网一站式学习平台

java.lang.Object
- org.apache.lucene.store.DataInput
- - org.apache.lucene.store.IndexInput
  - - org.apache.lucene.store.ByteBuffersIndexInput

All Implemented Interfaces:

Closeable, AutoCloseable, Cloneable, RandomAccessInput
```
public final class ByteBuffersIndexInput
extends IndexInput
implements RandomAccessInput
```
An IndexInput implementing RandomAccessInput and backed by a ByteBuffersDataInput.

Constructor Summary

Constructors
Constructor and Description

ByteBuffersIndexInput(ByteBuffersDataInput in, String resourceDescription)

Constructors
Constructor and Description
`ByteBuffersIndexInput(ByteBuffersDataInput in, String resourceDescription)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`IndexInput`	`clone()` Returns a clone of this stream.
`void`	`close()` Closes the stream to further operations.
`long`	`getFilePointer()` Returns the current position in this file, where the next read will occur.
`long`	`length()` The number of bytes in the file.
`RandomAccessInput`	`randomAccessSlice(long offset, long length)` Creates a random-access slice of this index input, with the given offset and length.
`byte`	`readByte()` Reads and returns a single byte.
`byte`	`readByte(long pos)` Reads a byte at the given position in the file
`void`	`readBytes(byte[] b, int offset, int len)` Reads a specified number of bytes into an array at the specified offset.
`void`	`readBytes(byte[] b, int offset, int len, boolean useBuffer)` Reads a specified number of bytes into an array at the specified offset with control over whether the read should be buffered (callers who have their own buffer should pass in "false" for useBuffer).
`int`	`readInt()` Reads four bytes and returns an int.
`int`	`readInt(long pos)` Reads an integer at the given position in the file
`long`	`readLong()` Reads eight bytes and returns a long.
`long`	`readLong(long pos)` Reads a long at the given position in the file
`Map<String,String>`	`readMapOfStrings()` Reads a Map<String,String> previously written with `DataOutput.writeMapOfStrings(Map)`.
`Set<String>`	`readSetOfStrings()` Reads a Set<String> previously written with `DataOutput.writeSetOfStrings(Set)`.
`short`	`readShort()` Reads two bytes and returns a short.
`short`	`readShort(long pos)` Reads a short at the given position in the file
`String`	`readString()` Reads a string.
`int`	`readVInt()` Reads an int stored in variable-length format.
`long`	`readVLong()` Reads a long stored in variable-length format.
`int`	`readZInt()` Read a `zig-zag`-encoded `variable-length` integer.
`long`	`readZLong()` Read a `zig-zag`-encoded `variable-length` integer.
`void`	`seek(long pos)` Sets current position in this file, where the next read will occur.
`void`	`skipBytes(long numBytes)` Skip over `numBytes` bytes.
`ByteBuffersIndexInput`	`slice(String sliceDescription, long offset, long length)` Creates a slice of this index input, with the given description, offset, and length.

Methods inherited from class org.apache.lucene.store.IndexInput
getFullSliceDescription, toString

Methods inherited from class org.apache.lucene.store.DataInput
readLELongs

Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - ByteBuffersIndexInput
```
public ByteBuffersIndexInput(ByteBuffersDataInput in,
                             String resourceDescription)
```
- Method Detail
  - close
```
public void close()
           throws IOException
```
    Description copied from class: IndexInput
    
    Closes the stream to further operations.
    
    Specified by:
    
    close in interface Closeable
    
    Specified by:
    
    close in interface AutoCloseable
    
    Specified by:
    
    close in class IndexInput
    
    Throws:
    
    IOException
  - getFilePointer
```
public long getFilePointer()
```
    Description copied from class: IndexInput
    
    Returns the current position in this file, where the next read will occur.
    
    Specified by:
    
    getFilePointer in class IndexInput
    
    See Also:
    
    IndexInput.seek(long)
  - seek
```
public void seek(long pos)
          throws IOException
```
    Description copied from class: IndexInput
    
    Sets current position in this file, where the next read will occur. If this is beyond the end of the file then this will throw EOFException and then the stream is in an undetermined state.
    
    Specified by:
    
    seek in class IndexInput
    
    Throws:
    
    IOException
    
    See Also:
    
    IndexInput.getFilePointer()
  - length
```
public long length()
```
    Description copied from class: IndexInput
    
    The number of bytes in the file.
    
    Specified by:
    
    length in class IndexInput
  - slice
```
public ByteBuffersIndexInput slice(String sliceDescription,
                                   long offset,
                                   long length)
                            throws IOException
```
    Description copied from class: IndexInput
    
    Creates a slice of this index input, with the given description, offset, and length. The slice is sought to the beginning.
    
    Specified by:
    
    slice in class IndexInput
    
    Throws:
    
    IOException
  - readByte
```
public byte readByte()
              throws IOException
```
    Description copied from class: DataInput
    
    Reads and returns a single byte.
    
    Specified by:
    
    readByte in class DataInput
    
    Throws:
    
    IOException
    
    See Also:
    
    DataOutput.writeByte(byte)
  - readBytes
```
public void readBytes(byte[] b,
                      int offset,
                      int len)
               throws IOException
```
    Description copied from class: DataInput
    
    Reads a specified number of bytes into an array at the specified offset.
    
    Specified by:
    
    readBytes in class DataInput
    
    Parameters:
    
    b - the array to read bytes into
    
    offset - the offset in the array to start storing bytes
    
    len - the number of bytes to read
    
    Throws:
    
    IOException
    
    See Also:
    
    DataOutput.writeBytes(byte[],int)
  - randomAccessSlice
```
public RandomAccessInput randomAccessSlice(long offset,
                                           long length)
                                    throws IOException
```
    Description copied from class: IndexInput
    
    Creates a random-access slice of this index input, with the given offset and length.
    The default implementation calls IndexInput.slice(java.lang.String, long, long), and it doesn't support random access, it implements absolute reads as seek+read.
    
    Overrides:
    
    randomAccessSlice in class IndexInput
    
    Throws:
    
    IOException
  - readBytes
```
public void readBytes(byte[] b,
                      int offset,
                      int len,
                      boolean useBuffer)
               throws IOException
```
    Description copied from class: DataInput
    
    Reads a specified number of bytes into an array at the specified offset with control over whether the read should be buffered (callers who have their own buffer should pass in "false" for useBuffer). Currently only BufferedIndexInput respects this parameter.
    
    Overrides:
    
    readBytes in class DataInput
    
    Parameters:
    
    b - the array to read bytes into
    
    offset - the offset in the array to start storing bytes
    
    len - the number of bytes to read
    
    useBuffer - set to false if the caller will handle buffering.
    
    Throws:
    
    IOException
    
    See Also:
    
    DataOutput.writeBytes(byte[],int)
  - readShort
```
public short readShort()
                throws IOException
```
    Description copied from class: DataInput
    
    Reads two bytes and returns a short.
    
    Overrides:
    
    readShort in class DataInput
    
    Throws:
    
    IOException
    
    See Also:
    
    DataOutput.writeByte(byte)
  - readInt
```
public int readInt()
            throws IOException
```
    Description copied from class: DataInput
    
    Reads four bytes and returns an int.
    
    Overrides:
    
    readInt in class DataInput
    
    Throws:
    
    IOException
    
    See Also:
    
    DataOutput.writeInt(int)
  - readVInt
```
public int readVInt()
             throws IOException
```
    Description copied from class: DataInput
    
    Reads an int stored in variable-length format. Reads between one and five bytes. Smaller values take fewer bytes. Negative numbers are supported, but should be avoided.
    The format is described further in DataOutput.writeVInt(int).
    
    Overrides:
    
    readVInt in class DataInput
    
    Throws:
    
    IOException
    
    See Also:
    
    DataOutput.writeVInt(int)
  - readZInt
```
public int readZInt()
             throws IOException
```
    Description copied from class: DataInput
    
    Read a zig-zag-encoded variable-length integer.
    
    Overrides:
    
    readZInt in class DataInput
    
    Throws:
    
    IOException
    
    See Also:
    
    DataOutput.writeZInt(int)
  - readLong
```
public long readLong()
              throws IOException
```
    Description copied from class: DataInput
    
    Reads eight bytes and returns a long.
    
    Overrides:
    
    readLong in class DataInput
    
    Throws:
    
    IOException
    
    See Also:
    
    DataOutput.writeLong(long)
  - readVLong
```
public long readVLong()
               throws IOException
```
    Description copied from class: DataInput
    
    Reads a long stored in variable-length format. Reads between one and nine bytes. Smaller values take fewer bytes. Negative numbers are not supported.
    The format is described further in DataOutput.writeVInt(int).
    
    Overrides:
    
    readVLong in class DataInput
    
    Throws:
    
    IOException
    
    See Also:
    
    DataOutput.writeVLong(long)
  - readZLong
```
public long readZLong()
               throws IOException
```
    Description copied from class: DataInput
    
    Read a zig-zag-encoded variable-length integer. Reads between one and ten bytes.
    
    Overrides:
    
    readZLong in class DataInput
    
    Throws:
    
    IOException
    
    See Also:
    
    DataOutput.writeZLong(long)
  - readString
```
public String readString()
                  throws IOException
```
    Description copied from class: DataInput
    
    Reads a string.
    
    Overrides:
    
    readString in class DataInput
    
    Throws:
    
    IOException
    
    See Also:
    
    DataOutput.writeString(String)
  - readMapOfStrings
```
public Map<String,String> readMapOfStrings()
                                    throws IOException
```
    Description copied from class: DataInput
    
    Reads a Map<String,String> previously written with DataOutput.writeMapOfStrings(Map).
    
    Overrides:
    
    readMapOfStrings in class DataInput
    
    Returns:
    
    An immutable map containing the written contents.
    
    Throws:
    
    IOException
  - readSetOfStrings
```
public Set<String> readSetOfStrings()
                             throws IOException
```
    Description copied from class: DataInput
    
    Reads a Set<String> previously written with DataOutput.writeSetOfStrings(Set).
    
    Overrides:
    
    readSetOfStrings in class DataInput
    
    Returns:
    
    An immutable set containing the written contents.
    
    Throws:
    
    IOException
  - skipBytes
```
public void skipBytes(long numBytes)
               throws IOException
```
    Description copied from class: DataInput
    
    Skip over numBytes bytes. The contract on this method is that it should have the same behavior as reading the same number of bytes into a buffer and discarding its content. Negative values of numBytes are not supported.
    
    Overrides:
    
    skipBytes in class DataInput
    
    Throws:
    
    IOException
  - readByte
```
public byte readByte(long pos)
              throws IOException
```
    Description copied from interface: RandomAccessInput
    
    Reads a byte at the given position in the file
    
    Specified by:
    
    readByte in interface RandomAccessInput
    
    Throws:
    
    IOException
    
    See Also:
    
    DataInput.readByte()
  - readShort
```
public short readShort(long pos)
                throws IOException
```
    Description copied from interface: RandomAccessInput
    
    Reads a short at the given position in the file
    
    Specified by:
    
    readShort in interface RandomAccessInput
    
    Throws:
    
    IOException
    
    See Also:
    
    DataInput.readShort()
  - readInt
```
public int readInt(long pos)
            throws IOException
```
    Description copied from interface: RandomAccessInput
    
    Reads an integer at the given position in the file
    
    Specified by:
    
    readInt in interface RandomAccessInput
    
    Throws:
    
    IOException
    
    See Also:
    
    DataInput.readInt()
  - readLong
```
public long readLong(long pos)
              throws IOException
```
    Description copied from interface: RandomAccessInput
    
    Reads a long at the given position in the file
    
    Specified by:
    
    readLong in interface RandomAccessInput
    
    Throws:
    
    IOException
    
    See Also:
    
    DataInput.readLong()
  - clone
```
public IndexInput clone()
```
    Description copied from class: IndexInput
    
    Returns a clone of this stream.
    Clones of a stream access the same data, and are positioned at the same point as the stream they were cloned from.
    Expert: Subclasses must ensure that clones may be positioned at different points in the input from each other and from the stream they were cloned from.
    Warning: Lucene never closes cloned IndexInputs, it will only call IndexInput.close() on the original object.
    If you access the cloned IndexInput after closing the original object, any readXXX methods will throw AlreadyClosedException.
    This method is NOT thread safe, so if the current IndexInput is being used by one thread while clone is called by another, disaster could strike.
    
    Overrides:
    
    clone in class IndexInput

Class ByteBuffersIndexInput

Constructor Summary

Method Summary

Methods inherited from class org.apache.lucene.store.IndexInput

Methods inherited from class org.apache.lucene.store.DataInput

Methods inherited from class java.lang.Object

Constructor Detail

ByteBuffersIndexInput

Method Detail

close

getFilePointer

seek

length

slice

readByte

readBytes

randomAccessSlice

readBytes

readShort

readInt

readVInt

readZInt

readLong

readVLong

readZLong

readString

readMapOfStrings

readSetOfStrings

skipBytes

readByte

readShort

readInt

readLong

clone