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package postgresql.fastpath;
import java.io.*;
import java.lang.*;
import java.net.*;
import java.util.*;
import java.sql.*;
import postgresql.util.*;
/**
* Each fastpath call requires an array of arguments, the number and type
* dependent on the function being called.
*
* <p>This class implements methods needed to provide this capability.
*
* <p>For an example on how to use this, refer to the postgresql.largeobject
* package
*
* @see postgresql.fastpath.Fastpath
* @see postgresql.largeobject.LargeObjectManager
* @see postgresql.largeobject.LargeObject
*/
public class FastpathArg
{
/**
* Type of argument, true=integer, false=byte[]
*/
public boolean type;
/**
* Integer value if type=true
*/
public int value;
/**
* Byte value if type=false;
*/
public byte[] bytes;
/**
* Constructs an argument that consists of an integer value
* @param value int value to set
*/
public FastpathArg(int value)
{
type=true;
this.value=value;
}
/**
* Constructs an argument that consists of an array of bytes
* @param bytes array to store
*/
public FastpathArg(byte bytes[])
{
type=false;
this.bytes=bytes;
}
/**
* Constructs an argument that consists of part of a byte array
* @param buf source array
* @param off offset within array
* @param len length of data to include
*/
public FastpathArg(byte buf[],int off,int len)
{
type=false;
bytes = new byte[len];
System.arraycopy(buf,off,bytes,0,len);
}
/**
* Constructs an argument that consists of a String.
* @param s String to store
*/
public FastpathArg(String s)
{
this(s.getBytes());
}
/**
* This sends this argument down the network stream.
*
* <p>The stream sent consists of the length.int4 then the contents.
*
* <p><b>Note:</b> This is called from Fastpath, and cannot be called from
* client code.
*
* @param s output stream
* @exception IOException if something failed on the network stream
*/
protected void send(postgresql.PG_Stream s) throws IOException
{
if(type) {
// argument is an integer
s.SendInteger(4,4); // size of an integer
s.SendInteger(value,4); // integer value of argument
} else {
// argument is a byte array
s.SendInteger(bytes.length,4); // size of array
s.Send(bytes);
}
}
}
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