Class DeltaEncoder
- java.lang.Object
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- org.eclipse.jgit.internal.storage.pack.DeltaEncoder
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public class DeltaEncoder extends Object
Encodes an instruction stream forBinaryDelta
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Constructor Summary
Constructors Constructor Description DeltaEncoder(OutputStream out, long baseSize, long resultSize)
Create an encoder with no upper bound on the instruction stream size.DeltaEncoder(OutputStream out, long baseSize, long resultSize, int limit)
Create an encoder with an upper limit on the instruction size.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
copy(long offset, int cnt)
Create a copy instruction to copy from the base object.int
getSize()
Get current size of the delta stream, in bytes.boolean
insert(byte[] text)
Insert a literal binary sequence.boolean
insert(byte[] text, int off, int cnt)
Insert a literal binary sequence.boolean
insert(String text)
Insert a literal string of text, in UTF-8 encoding.
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Constructor Detail
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DeltaEncoder
public DeltaEncoder(OutputStream out, long baseSize, long resultSize) throws IOException
Create an encoder with no upper bound on the instruction stream size.- Parameters:
out
- buffer to store the instructions written.baseSize
- size of the base object, in bytes.resultSize
- size of the resulting object, after applying this instruction stream to the base object, in bytes.- Throws:
IOException
- the output buffer cannot store the instruction stream's header with the size fields.
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DeltaEncoder
public DeltaEncoder(OutputStream out, long baseSize, long resultSize, int limit) throws IOException
Create an encoder with an upper limit on the instruction size.- Parameters:
out
- buffer to store the instructions written.baseSize
- size of the base object, in bytes.resultSize
- size of the resulting object, after applying this instruction stream to the base object, in bytes.limit
- maximum number of bytes to write to the out buffer declaring the stream is over limit and should be discarded. May be 0 to specify an infinite limit.- Throws:
IOException
- the output buffer cannot store the instruction stream's header with the size fields.
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Method Detail
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getSize
public int getSize()
Get current size of the delta stream, in bytes.- Returns:
- current size of the delta stream, in bytes.
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insert
public boolean insert(String text) throws IOException
Insert a literal string of text, in UTF-8 encoding.- Parameters:
text
- the string to insert.- Returns:
- true if the insert fits within the limit; false if the insert would cause the instruction stream to exceed the limit.
- Throws:
IOException
- the instruction buffer can't store the instructions.
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insert
public boolean insert(byte[] text) throws IOException
Insert a literal binary sequence.- Parameters:
text
- the binary to insert.- Returns:
- true if the insert fits within the limit; false if the insert would cause the instruction stream to exceed the limit.
- Throws:
IOException
- the instruction buffer can't store the instructions.
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insert
public boolean insert(byte[] text, int off, int cnt) throws IOException
Insert a literal binary sequence.- Parameters:
text
- the binary to insert.off
- offset withintext
to start copying from.cnt
- number of bytes to insert.- Returns:
- true if the insert fits within the limit; false if the insert would cause the instruction stream to exceed the limit.
- Throws:
IOException
- the instruction buffer can't store the instructions.
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copy
public boolean copy(long offset, int cnt) throws IOException
Create a copy instruction to copy from the base object.- Parameters:
offset
- position in the base object to copy from. This is absolute, from the beginning of the base.cnt
- number of bytes to copy.- Returns:
- true if the copy fits within the limit; false if the copy would cause the instruction stream to exceed the limit.
- Throws:
IOException
- the instruction buffer cannot store the instructions.
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