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java.lang.Objectorg.apache.derby.iapi.services.io.CompressedNumber
public abstract class CompressedNumber
Static methods to write and read compressed forms of numbers to DataOut and DataIn interfaces. Format written is platform independent like the Data* interfaces and must remain fixed once a product is shipped. If a different format is required then write a new set of methods, e.g. writeInt2. The formats defined by stored format identifiers are implicitly dependent on these formats not changing.
Field Summary | |
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static int |
MAX_COMPRESSED_INT_ONE_BYTE
|
static int |
MAX_COMPRESSED_INT_TWO_BYTES
|
static int |
MAX_INT_STORED_SIZE
|
static int |
MAX_LONG_STORED_SIZE
|
Constructor Summary | |
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CompressedNumber()
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Method Summary | |
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static int |
readInt(byte[] data,
int offset)
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static int |
readInt(java.io.DataInput in)
Read an integer previously written by writeInt(). |
static int |
readInt(java.io.InputStream in)
Read an integer previously written by writeInt(). |
static long |
readLong(byte[] data,
int offset)
|
static long |
readLong(java.io.DataInput in)
Read a long previously written by writeLong(). |
static long |
readLong(java.io.InputStream in)
Read a long previously written by writeLong(). |
static int |
sizeInt(int value)
Return the number of bytes that would be written by a writeInt call |
static int |
sizeLong(long value)
|
static int |
writeInt(java.io.DataOutput out,
int value)
Write a compressed integer only supporting signed values. |
static int |
writeInt(java.io.OutputStream out,
int value)
Write a compressed integer directly to an OutputStream. |
static int |
writeLong(java.io.DataOutput out,
long value)
Write a compressed long only supporting signed values. |
static int |
writeLong(java.io.OutputStream out,
long value)
Write a compressed integer only supporting signed values. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public static final int MAX_INT_STORED_SIZE
public static final int MAX_LONG_STORED_SIZE
public static final int MAX_COMPRESSED_INT_ONE_BYTE
public static final int MAX_COMPRESSED_INT_TWO_BYTES
Constructor Detail |
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public CompressedNumber()
Method Detail |
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public static final int writeInt(java.io.DataOutput out, int value) throws java.io.IOException
1 Byte - 00xxxxxx Represents the value <= 63 (0x3f) 2 Byte - 01xxxxxx xxxxxxxx Represents the value > 63 && <= 16383 (0x3fff) 4 byte - 1xxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx Represents the value > 16383 && <= MAX_INT
java.io.IOException
- value is negative or an exception was thrown by a method on out.public static final int writeInt(java.io.OutputStream out, int value) throws java.io.IOException
java.io.IOException
- an exception was thrown by a method on in.public static final int readInt(java.io.DataInput in) throws java.io.IOException
java.io.IOException
- an exception was thrown by a method on in.public static final int readInt(java.io.InputStream in) throws java.io.IOException
java.io.IOException
- an exception was thrown by a method on in.public static final int readInt(byte[] data, int offset)
public static final int sizeInt(int value)
public static final int writeLong(java.io.DataOutput out, long value) throws java.io.IOException
2 byte - 00xxxxxx xxxxxxxx Represents the value <= 16383 (0x3fff) 4 byte - 01xxxxxx xxxxxxxx xxxxxxxx xxxxxxxx Represents the value > 16383 && <= 0x3fffffff 8 byte - 1xxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx Represents the value > 0x3fffffff && <= MAX_LONG
java.io.IOException
- value is negative or an exception was thrown by a method on out.public static final int writeLong(java.io.OutputStream out, long value) throws java.io.IOException
java.io.IOException
- value is negative or an exception was thrown by a method on out.public static final long readLong(java.io.DataInput in) throws java.io.IOException
java.io.IOException
- an exception was thrown by a method on in.public static final long readLong(java.io.InputStream in) throws java.io.IOException
java.io.IOException
- an exception was thrown by a method on in.public static final long readLong(byte[] data, int offset)
public static final int sizeLong(long value)
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