Package org.apache.lucene.util
Class PagedBytes
- java.lang.Object
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- org.apache.lucene.util.PagedBytes
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public final class PagedBytes extends java.lang.ObjectRepresents a logical byte[] as a series of pages. You can write-once into the logical byte[] (append only), using copy, and then retrieve slices (BytesRef) into it using fill.
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Nested Class Summary
Nested Classes Modifier and Type Class Description classPagedBytes.PagedBytesDataInputclassPagedBytes.PagedBytesDataOutputstatic classPagedBytes.ReaderProvides methods to read BytesRefs from a frozen PagedBytes.
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Constructor Summary
Constructors Constructor Description PagedBytes(int blockBits)1<<blockBits must be bigger than biggest single BytesRef slice that will be pulled
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description voidcopy(IndexInput in, long byteCount)Read this many bytes from invoidcopy(BytesRef bytes, BytesRef out)Copy BytesRef in, setting BytesRef out to the result.longcopyUsingLengthPrefix(BytesRef bytes)Copy bytes in, writing the length as a 1 or 2 byte vInt prefix.PagedBytes.Readerfreeze(boolean trim)Commits final byte[], trimming it if necessary and if trim=truePagedBytes.PagedBytesDataInputgetDataInput()Returns a DataInput to read values from this PagedBytes instance.PagedBytes.PagedBytesDataOutputgetDataOutput()Returns a DataOutput that you may use to write into this PagedBytes instance.longgetPointer()longramBytesUsed()Return approx RAM usage in bytes.
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Method Detail
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copy
public void copy(IndexInput in, long byteCount) throws java.io.IOException
Read this many bytes from in- Throws:
java.io.IOException
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copy
public void copy(BytesRef bytes, BytesRef out)
Copy BytesRef in, setting BytesRef out to the result. Do not use this if you will use freeze(true). This only supports bytes.length <= blockSize
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freeze
public PagedBytes.Reader freeze(boolean trim)
Commits final byte[], trimming it if necessary and if trim=true
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getPointer
public long getPointer()
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ramBytesUsed
public long ramBytesUsed()
Return approx RAM usage in bytes.
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copyUsingLengthPrefix
public long copyUsingLengthPrefix(BytesRef bytes)
Copy bytes in, writing the length as a 1 or 2 byte vInt prefix.
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getDataInput
public PagedBytes.PagedBytesDataInput getDataInput()
Returns a DataInput to read values from this PagedBytes instance.
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getDataOutput
public PagedBytes.PagedBytesDataOutput getDataOutput()
Returns a DataOutput that you may use to write into this PagedBytes instance. If you do this, you should not call the other writing methods (eg, copy); results are undefined.
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