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Bring in Peter's changes...finally :(

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This commit is contained in:
Marc G. Fournier 1997-09-20 02:21:25 +00:00
parent e9cd0f2e6b
commit fa67a247cf
10 changed files with 1327 additions and 250 deletions
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262
src/interfaces/jdbc/postgresql/Connection.java
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@ -28,7 +28,7 @@ import postgresql.*;
*/ */
public class Connection implements java.sql.Connection public class Connection implements java.sql.Connection
{ {
private PG_Stream pg_stream; protected PG_Stream pg_stream;
private String PG_HOST; private String PG_HOST;
private int PG_PORT; private int PG_PORT;
@ -591,256 +591,18 @@ public class Connection implements java.sql.Connection
{ {
return PG_USER; return PG_USER;
} }
/**
* This method is not part of the Connection interface. Its is an extension
* that allows access to the PostgreSQL Large Object API
*
* @return PGlobj class that implements the API
*/
public PGlobj getLargeObjectAPI() throws SQLException
{
return new PGlobj(this);
}
} }
// *********************************************************************** // ***********************************************************************
// This class handles all the Streamed I/O for a postgresql connection
class PG_Stream
{
private Socket connection;
private InputStream pg_input;
private OutputStream pg_output;
/**
* Constructor: Connect to the PostgreSQL back end and return
* a stream connection.
*
* @param host the hostname to connect to
* @param port the port number that the postmaster is sitting on
* @exception IOException if an IOException occurs below it.
*/
public PG_Stream(String host, int port) throws IOException
{
connection = new Socket(host, port);
pg_input = connection.getInputStream();
pg_output = connection.getOutputStream();
}
/**
* Sends a single character to the back end
*
* @param val the character to be sent
* @exception IOException if an I/O error occurs
*/
public void SendChar(int val) throws IOException
{
pg_output.write(val);
}
/**
* Sends an integer to the back end
*
* @param val the integer to be sent
* @param siz the length of the integer in bytes (size of structure)
* @exception IOException if an I/O error occurs
*/
public void SendInteger(int val, int siz) throws IOException
{
byte[] buf = new byte[siz];
while (siz-- > 0)
{
buf[siz] = (byte)(val & 0xff);
val >>= 8;
}
Send(buf);
}
/**
* Send an array of bytes to the backend
*
* @param buf The array of bytes to be sent
* @exception IOException if an I/O error occurs
*/
public void Send(byte buf[]) throws IOException
{
pg_output.write(buf);
}
/**
* Send an exact array of bytes to the backend - if the length
* has not been reached, send nulls until it has.
*
* @param buf the array of bytes to be sent
* @param siz the number of bytes to be sent
* @exception IOException if an I/O error occurs
*/
public void Send(byte buf[], int siz) throws IOException
{
int i;
pg_output.write(buf, 0, (buf.length < siz ? buf.length : siz));
if (buf.length < siz)
{
for (i = buf.length ; i < siz ; ++i)
{
pg_output.write(0);
}
}
}
/**
* Receives a single character from the backend
*
* @return the character received
* @exception SQLException if an I/O Error returns
*/
public int ReceiveChar() throws SQLException
{
int c = 0;
try
{
c = pg_input.read();
if (c < 0) throw new IOException("EOF");
} catch (IOException e) {
throw new SQLException("Error reading from backend: " + e.toString());
}
return c;
}
/**
* Receives an integer from the backend
*
* @param siz length of the integer in bytes
* @return the integer received from the backend
* @exception SQLException if an I/O error occurs
*/
public int ReceiveInteger(int siz) throws SQLException
{
int n = 0;
try
{
for (int i = 0 ; i < siz ; i++)
{
int b = pg_input.read();
if (b < 0)
throw new IOException("EOF");
n = n | (b >> (8 * i)) ;
}
} catch (IOException e) {
throw new SQLException("Error reading from backend: " + e.toString());
}
return n;
}
/**
* Receives a null-terminated string from the backend. Maximum of
* maxsiz bytes - if we don't see a null, then we assume something
* has gone wrong.
*
* @param maxsiz maximum length of string
* @return string from back end
* @exception SQLException if an I/O error occurs
*/
public String ReceiveString(int maxsiz) throws SQLException
{
byte[] rst = new byte[maxsiz];
int s = 0;
try
{
while (s < maxsiz)
{
int c = pg_input.read();
if (c < 0)
throw new IOException("EOF");
else if (c == 0)
break;
else
rst[s++] = (byte)c;
}
if (s >= maxsiz)
throw new IOException("Too Much Data");
} catch (IOException e) {
throw new SQLException("Error reading from backend: " + e.toString());
}
String v = new String(rst, 0, s);
return v;
}
/**
* Read a tuple from the back end. A tuple is a two dimensional
* array of bytes
*
* @param nf the number of fields expected
* @param bin true if the tuple is a binary tuple
* @return null if the current response has no more tuples, otherwise
* an array of strings
* @exception SQLException if a data I/O error occurs
*/
public byte[][] ReceiveTuple(int nf, boolean bin) throws SQLException
{
int i, bim = (nf + 7)/8;
byte[] bitmask = Receive(bim);
byte[][] answer = new byte[nf][0];
int whichbit = 0x80;
int whichbyte = 0;
for (i = 0 ; i < nf ; ++i)
{
boolean isNull = ((bitmask[whichbyte] & whichbit) == 0);
whichbit >>= 1;
if (whichbit == 0)
{
++whichbyte;
whichbit = 0x80;
}
if (isNull)
answer[i] = null;
else
{
int len = ReceiveInteger(4);
if (!bin)
len -= 4;
if (len < 0)
len = 0;
answer[i] = Receive(len);
}
}
return answer;
}
/**
* Reads in a given number of bytes from the backend
*
* @param siz number of bytes to read
* @return array of bytes received
* @exception SQLException if a data I/O error occurs
*/
private byte[] Receive(int siz) throws SQLException
{
byte[] answer = new byte[siz];
int s = 0;
try
{
while (s < siz)
{
int w = pg_input.read(answer, s, siz - s);
if (w < 0)
throw new IOException("EOF");
s += w;
}
} catch (IOException e) {
throw new SQLException("Error reading from backend: " + e.toString());
}
return answer;
}
/**
* Closes the connection
*
* @exception IOException if a IO Error occurs
*/
public void close() throws IOException
{
pg_output.close();
pg_input.close();
connection.close();
}
}

309
src/interfaces/jdbc/postgresql/PG_Stream.java Normal file
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@ -0,0 +1,309 @@
package postgresql;
import java.io.*;
import java.lang.*;
import java.net.*;
import java.util.*;
import java.sql.*;
import postgresql.*;
/**
* @version 1.0 15-APR-1997
*
* This class is used by Connection & PGlobj for communicating with the
* backend.
*
* @see java.sql.Connection
*/
// This class handles all the Streamed I/O for a postgresql connection
public class PG_Stream
{
private Socket connection;
private InputStream pg_input;
private OutputStream pg_output;
/**
* Constructor: Connect to the PostgreSQL back end and return
* a stream connection.
*
* @param host the hostname to connect to
* @param port the port number that the postmaster is sitting on
* @exception IOException if an IOException occurs below it.
*/
public PG_Stream(String host, int port) throws IOException
{
connection = new Socket(host, port);
pg_input = connection.getInputStream();
pg_output = connection.getOutputStream();
}
/**
* Sends a single character to the back end
*
* @param val the character to be sent
* @exception IOException if an I/O error occurs
*/
public void SendChar(int val) throws IOException
{
//pg_output.write(val);
byte b[] = new byte[1];
b[0] = (byte)val;
pg_output.write(b);
}
/**
* Sends an integer to the back end
*
* @param val the integer to be sent
* @param siz the length of the integer in bytes (size of structure)
* @exception IOException if an I/O error occurs
*/
public void SendInteger(int val, int siz) throws IOException
{
byte[] buf = new byte[siz];
while (siz-- > 0)
{
buf[siz] = (byte)(val & 0xff);
val >>= 8;
}
Send(buf);
}
/**
* Send an array of bytes to the backend
*
* @param buf The array of bytes to be sent
* @exception IOException if an I/O error occurs
*/
public void Send(byte buf[]) throws IOException
{
pg_output.write(buf);
}
/**
* Send an exact array of bytes to the backend - if the length
* has not been reached, send nulls until it has.
*
* @param buf the array of bytes to be sent
* @param siz the number of bytes to be sent
* @exception IOException if an I/O error occurs
*/
public void Send(byte buf[], int siz) throws IOException
{
Send(buf,0,siz);
}
/**
* Send an exact array of bytes to the backend - if the length
* has not been reached, send nulls until it has.
*
* @param buf the array of bytes to be sent
* @param off offset in the array to start sending from
* @param siz the number of bytes to be sent
* @exception IOException if an I/O error occurs
*/
public void Send(byte buf[], int off, int siz) throws IOException
{
int i;
pg_output.write(buf, off, ((buf.length-off) < siz ? (buf.length-off) : siz));
if((buf.length-off) < siz)
{
for (i = buf.length-off ; i < siz ; ++i)
{
pg_output.write(0);
}
}
}
/**
* Receives a single character from the backend
*
* @return the character received
* @exception SQLException if an I/O Error returns
*/
public int ReceiveChar() throws SQLException
{
int c = 0;
try
{
c = pg_input.read();
if (c < 0) throw new IOException("EOF");
} catch (IOException e) {
throw new SQLException("Error reading from backend: " + e.toString());
}
return c;
}
/**
* Receives an integer from the backend
*
* @param siz length of the integer in bytes
* @return the integer received from the backend
* @exception SQLException if an I/O error occurs
*/
public int ReceiveInteger(int siz) throws SQLException
{
int n = 0;
try
{
for (int i = 0 ; i < siz ; i++)
{
int b = pg_input.read();
if (b < 0)
throw new IOException("EOF");
n = n | (b >> (8 * i)) ;
}
} catch (IOException e) {
throw new SQLException("Error reading from backend: " + e.toString());
}
return n;
}
/**
* Receives a null-terminated string from the backend. Maximum of
* maxsiz bytes - if we don't see a null, then we assume something
* has gone wrong.
*
* @param maxsiz maximum length of string
* @return string from back end
* @exception SQLException if an I/O error occurs
*/
public String ReceiveString(int maxsiz) throws SQLException
{
byte[] rst = new byte[maxsiz];
int s = 0;
try
{
while (s < maxsiz)
{
int c = pg_input.read();
if (c < 0)
throw new IOException("EOF");
else if (c == 0)
break;
else
rst[s++] = (byte)c;
}
if (s >= maxsiz)
throw new IOException("Too Much Data");
} catch (IOException e) {
throw new SQLException("Error reading from backend: " + e.toString());
}
String v = new String(rst, 0, s);
return v;
}
/**
* Read a tuple from the back end. A tuple is a two dimensional
* array of bytes
*
* @param nf the number of fields expected
* @param bin true if the tuple is a binary tuple
* @return null if the current response has no more tuples, otherwise
* an array of strings
* @exception SQLException if a data I/O error occurs
*/
public byte[][] ReceiveTuple(int nf, boolean bin) throws SQLException
{
int i, bim = (nf + 7)/8;
byte[] bitmask = Receive(bim);
byte[][] answer = new byte[nf][0];
int whichbit = 0x80;
int whichbyte = 0;
for (i = 0 ; i < nf ; ++i)
{
boolean isNull = ((bitmask[whichbyte] & whichbit) == 0);
whichbit >>= 1;
if (whichbit == 0)
{
++whichbyte;
whichbit = 0x80;
}
if (isNull)
answer[i] = null;
else
{
int len = ReceiveInteger(4);
if (!bin)
len -= 4;
if (len < 0)
len = 0;
answer[i] = Receive(len);
}
}
return answer;
}
/**
* Reads in a given number of bytes from the backend
*
* @param siz number of bytes to read
* @return array of bytes received
* @exception SQLException if a data I/O error occurs
*/
private byte[] Receive(int siz) throws SQLException
{
byte[] answer = new byte[siz];
int s = 0;
try
{
while (s < siz)
{
int w = pg_input.read(answer, s, siz - s);
if (w < 0)
throw new IOException("EOF");
s += w;
}
} catch (IOException e) {
throw new SQLException("Error reading from backend: " + e.toString());
}
return answer;
}
/**
* Reads in a given number of bytes from the backend
*
* @param buf buffer to store result
* @param off offset in buffer
* @param siz number of bytes to read
* @exception SQLException if a data I/O error occurs
*/
public void Receive(byte[] b,int off,int siz) throws SQLException
{
int s = 0;
try
{
while (s < siz)
{
int w = pg_input.read(b, off+s, siz - s);
if (w < 0)
throw new IOException("EOF");
s += w;
}
} catch (IOException e) {
throw new SQLException("Error reading from backend: " + e.toString());
}
}
/**
* Closes the connection
*
* @exception IOException if a IO Error occurs
*/
public void close() throws IOException
{
pg_output.close();
pg_input.close();
connection.close();
}
}

59
src/interfaces/jdbc/postgresql/PGbox.java Normal file
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@ -0,0 +1,59 @@
/**
* @version 6.2
*
* This implements a box consisting of two points
*
*/
package postgresql;
import java.io.*;
import java.sql.*;
public class PGbox implements Serializable
{
/**
* These are the two points.
*/
public PGpoint point[] = new PGpoint[2];
public PGbox(double x1,double y1,double x2,double y2)
{
this.point[0] = new PGpoint(x1,y1);
this.point[1] = new PGpoint(x2,y2);
}
public PGbox(PGpoint p1,PGpoint p2)
{
this.point[0] = p1;
this.point[1] = p2;
}
/**
* This constructor is used by the driver.
*/
public PGbox(String s) throws SQLException
{
PGtokenizer t = new PGtokenizer(s,',');
if(t.getSize() != 2)
throw new SQLException("conversion of box failed - "+s);
point[0] = new PGpoint(t.getToken(0));
point[1] = new PGpoint(t.getToken(1));
}
public boolean equals(Object obj)
{
PGbox p = (PGbox)obj;
return (p.point[0].equals(point[0]) && p.point[1].equals(point[1])) ||
(p.point[0].equals(point[1]) && p.point[1].equals(point[0]));
}
/**
* This returns the lseg in the syntax expected by postgresql
*/
public String toString()
{
return point[0].toString()+","+point[1].toString();
}
}

72
src/interfaces/jdbc/postgresql/PGcircle.java Normal file
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@ -0,0 +1,72 @@
/**
*
* This implements a circle consisting of a point and a radius
*
*/
package postgresql;
import java.io.*;
import java.sql.*;
public class PGcircle implements Serializable
{
/**
* This is the centre point
*/
public PGpoint center;
/**
* This is the radius
*/
double radius;
public PGcircle(double x,double y,double r)
{
this.center = new PGpoint(x,y);
this.radius = r;
}
public PGcircle(PGpoint c,double r)
{
this.center = c;
this.radius = r;
}
public PGcircle(PGcircle c)
{
this.center = new PGpoint(c.center);
this.radius = c.radius;
}
/**
* This constructor is used by the driver.
*/
public PGcircle(String s) throws SQLException
{
PGtokenizer t = new PGtokenizer(PGtokenizer.removeAngle(s),',');
if(t.getSize() != 2)
throw new SQLException("conversion of circle failed - "+s);
try {
center = new PGpoint(t.getToken(0));
radius = Double.valueOf(t.getToken(1)).doubleValue();
} catch(NumberFormatException e) {
throw new SQLException("conversion of circle failed - "+s+" - +"+e.toString());
}
}
public boolean equals(Object obj)
{
PGcircle p = (PGcircle)obj;
return p.center.equals(center) && p.radius==radius;
}
/**
* This returns the circle in the syntax expected by postgresql
*/
public String toString()
{
return "<"+center+","+radius+">";
}
}

462
src/interfaces/jdbc/postgresql/PGlobj.java Normal file
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@ -0,0 +1,462 @@
// Java Interface to Postgres
// $Id: PGlobj.java,v 1.1 1997/09/20 02:21:22 scrappy Exp $
// Copyright (c) 1997 Peter T Mount
package postgresql;
import java.sql.*;
import java.math.*;
import java.net.*;
import java.io.*;
import java.util.*;
/**
* This class implements the large object interface to postgresql.
*
* It provides the basic methods required to run the interface, plus
* a pair of methods that provide InputStream and OutputStream classes
* for this object.
*/
public class PGlobj
{
// This table contains the function oid's used by the backend
private Hashtable func = new Hashtable();
protected postgresql.Connection conn;
/**
* These are the values for mode, taken from libpq-fs.h
*/
public static final int INV_ARCHIVE = 0x00010000;
public static final int INV_WRITE = 0x00020000;
public static final int INV_READ = 0x00040000;
/**
* These are the functions that implement the interface
*/
private static final String OPEN = "lo_open";
private static final String CLOSE = "lo_close";
private static final String CREATE = "lo_creat";
private static final String UNLINK = "lo_unlink";
private static final String SEEK = "lo_lseek";
private static final String TELL = "lo_tell";
private static final String READ = "loread";
private static final String WRITE = "lowrite";
/**
* This creates the interface
*/
public PGlobj(Connection conn) throws SQLException
{
if(!(conn instanceof postgresql.Connection))
throw new SQLException("PGlobj: Wrong connection class");
this.conn = (postgresql.Connection)conn;
ResultSet res = (postgresql.ResultSet)conn.createStatement().executeQuery("select proname, oid from pg_proc" +
" where proname = 'lo_open'" +
" or proname = 'lo_close'" +
" or proname = 'lo_creat'" +
" or proname = 'lo_unlink'" +
" or proname = 'lo_lseek'" +
" or proname = 'lo_tell'" +
" or proname = 'loread'" +
" or proname = 'lowrite'");
if(res==null)
throw new SQLException("failed to initialise large object interface");
while(res.next()) {
func.put(res.getString(1),new Integer(res.getInt(2)));
DriverManager.println("PGlobj:func "+res.getString(1)+" oid="+res.getInt(2));
}
res.close();
}
// this returns the oid of the function
private int getFunc(String name) throws SQLException
{
Integer i = (Integer)func.get(name);
if(i==null)
throw new SQLException("unknown function: "+name);
return i.intValue();
}
/**
* This calls a function on the backend
* @param fnid oid of the function to run
* @param args array containing args, 3 ints per arg
*/
public int PQfn(int fnid,int args[]) throws SQLException
{
return PQfn(fnid,args,null,0,0);
}
// fix bug in 6.1.1
public void writeInt(DataOutputStream data,int i) throws IOException
{
data.writeByte((i>>24)&0xff);
data.writeByte( i &0xff);
data.writeByte((i>>8) &0xff);
data.writeByte((i>>16)&0xff);
}
/**
* This calls a function on the backend
* @param fnid oid of the function to run
* @param args array containing args, 3 ints per arg
* @param buf byte array to write into, null returns result as an integer
* @param off offset in array
* @param len number of bytes to read
*/
public int PQfn(int fnid,int args[],byte buf[],int off,int len) throws SQLException
{
//ByteArrayOutputStream b = new ByteArrayOutputStream();
//DataOutputStream data = new DataOutputStream(b);
int in = -1;
try {
int al=args.length/3;
// For some reason, the backend takes these in the reverse order
byte b[] = new byte[2+4+4];
int bp=0;
b[bp++]='F';
b[bp++]=0;
b[bp++]=(byte)((fnid)&0xff);
b[bp++]=(byte)((fnid>>24)&0xff);
b[bp++]=(byte)((fnid>>16)&0xff);
b[bp++]=(byte)((fnid>>8)&0xff);
b[bp++]=(byte)((al)&0xff);
b[bp++]=(byte)((al>>24)&0xff);
b[bp++]=(byte)((al>>16)&0xff);
b[bp++]=(byte)((al>>8)&0xff);
conn.pg_stream.Send(b);
//conn.pg_stream.SendChar('F');
//conn.pg_stream.SendInteger(fnid,4);
//conn.pg_stream.SendInteger(args.length / 3,4);
int l = args.length-1;
if(args[l]==0) l--;
for(int i=0;i<l;i++)
conn.pg_stream.SendInteger(args[i],4);
if(args[args.length-1]==0)
conn.pg_stream.Send(buf,off,len);
} catch(Exception e) {
throw new SQLException("lo_open failed");
}
//try {
if((in = conn.pg_stream.ReceiveChar())!='V') {
if(in=='E')
throw new SQLException(conn.pg_stream.ReceiveString(4096));
throw new SQLException("lobj: expected 'V' from backend, got "+((char)in));
}
while(true) {
in = conn.pg_stream.ReceiveChar();
switch(in)
{
case 'G':
if(buf==null)
in = conn.pg_stream.ReceiveInteger(4);
else
conn.pg_stream.Receive(buf,off,len);
conn.pg_stream.ReceiveChar();
return in;
case 'E':
throw new SQLException("lobj: error - "+conn.pg_stream.ReceiveString(4096));
case 'N':
conn.pg_stream.ReceiveString(4096);
break;
case '0':
return -1;
default:
throw new SQLException("lobj: protocol error");
}
}
// } catch(IOException ioe) {
// throw new SQLException("lobj: Network error - "+ioe);
//}
}
/**
* This opens a large object. It returns a handle that is used to
* access the object.
*/
public int open(int lobjId,int mode) throws SQLException
{
int args[] = new int[2*3];
args[0] = args[3] = 4;
args[1] = args[4] = 1;
args[2] = lobjId;
args[5] = mode;
int fd = PQfn(getFunc(OPEN),args);
if(fd<0)
throw new SQLException("lo_open: no object");
seek(fd,0);
return fd;
}
/**
* This closes a large object.
*/
public void close(int fd) throws SQLException
{
int args[] = new int[1*3];
args[0] = 4;
args[1] = 1;
args[2] = fd;
// flush/close streams here?
PQfn(getFunc(CLOSE),args);
}
/**
* This reads a block of bytes from the large object
* @param fd descriptor for an open large object
* @param buf byte array to write into
* @param off offset in array
* @param len number of bytes to read
*/
public void read(int fd,byte buf[],int off,int len) throws SQLException
{
int args[] = new int[2*3];
args[0] = args[3] = 4;
args[1] = args[4] = 1;
args[2] = fd;
args[5] = len;
PQfn(getFunc(READ),args,buf,off,len);
}
/**
* This writes a block of bytes to an open large object
* @param fd descriptor for an open large object
* @param buf byte array to write into
* @param off offset in array
* @param len number of bytes to read
*/
public void write(int fd,byte buf[],int off,int len) throws SQLException
{
int args[] = new int[2*3];
args[0] = args[3] = 4;
args[1] = args[4] = 1;
args[2] = fd;
args[5] = 0;
PQfn(getFunc(WRITE),args,buf,off,len);
}
/**
* This sets the current read or write location on a large object.
* @param fd descriptor of an open large object
* @param off offset in object
*/
public void seek(int fd,int off) throws SQLException
{
int args[] = new int[3*3];
args[0] = args[3] = args[6] = 4;
args[1] = args[4] = args[7] = 1;
args[2] = fd;
args[5] = off;
args[8] = 0; // SEEK
PQfn(getFunc(SEEK),args);
}
/**
* This creates a new large object.
*
* the mode is a bitmask describing different attributes of the new object
*
* returns the oid of the large object created.
*/
public int create(int mode) throws SQLException
{
int args[] = new int[1*3];
args[0] = 4;
args[1] = 1;
args[2] = mode;
return PQfn(getFunc(CREATE),args);
}
/**
* This returns the current location within the large object
*/
public int tell(int fd) throws SQLException
{
int args[] = new int[1*3];
args[0] = 4;
args[1] = 1;
args[2] = fd;
return PQfn(getFunc(TELL),args);
}
/**
* This removes a large object from the database
*/
public void unlink(int fd) throws SQLException
{
int args[] = new int[1*3];
args[0] = 4;
args[1] = 1;
args[2] = fd;
PQfn(getFunc(UNLINK),args);
}
/**
* This returns an InputStream based on an object
*/
public InputStream getInputStream(int fd) throws SQLException
{
return (InputStream) new PGlobjInput(this,fd);
}
/**
* This returns an OutputStream based on an object
*/
public OutputStream getOutputStream(int fd) throws SQLException
{
return (OutputStream) new PGlobjOutput(this,fd);
}
/**
* As yet, the lo_import and lo_export functions are not implemented.
*/
}
// This class implements an InputStream based on a large object
//
// Note: Unlike most InputStreams, this one supports mark()/reset()
//
class PGlobjInput extends InputStream
{
private PGlobj obj;
private int fd;
private int mp; // mark position
private int rl; // read limit
// This creates an Input stream based for a large object
public PGlobjInput(PGlobj obj,int fd)
{
this.obj = obj;
this.fd = fd;
}
public int read() throws IOException
{
byte b[] = new byte[1];
read(b,0,1);
return (int)b[0];
}
public int read(byte b[],int off,int len) throws IOException
{
try {
obj.read(fd,b,off,len);
} catch(SQLException e) {
throw new IOException(e.toString());
}
return len;
}
public long skip(long n) throws IOException
{
try {
int cp = obj.tell(fd);
obj.seek(fd,cp+(int)n);
return obj.tell(fd) - cp;
} catch(SQLException e) {
throw new IOException(e.toString());
}
}
public synchronized void mark(int readLimit)
{
try {
mp = obj.tell(fd);
rl = readLimit;
} catch(SQLException e) {
// We should throw an exception here, but mark() doesn't ;-(
}
}
public void reset() throws IOException
{
try {
int cp = obj.tell(fd);
if((cp-mp)>rl)
throw new IOException("mark invalidated");
obj.seek(fd,mp);
} catch(SQLException e) {
throw new IOException(e.toString());
}
}
public boolean markSupported()
{
return true;
}
public void close() throws IOException
{
try {
obj.close(fd);
} catch(SQLException e) {
throw new IOException(e.toString());
}
}
}
// This class implements an OutputStream to a large object
class PGlobjOutput extends OutputStream
{
private PGlobj obj;
private int fd;
// This creates an Input stream based for a large object
public PGlobjOutput(PGlobj obj,int fd)
{
this.obj = obj;
this.fd = fd;
}
public void write(int i) throws IOException
{
byte b[] = new byte[1];
b[0] = (byte)i;
write(b,0,1);
}
public void write(byte b[],int off,int len) throws IOException
{
try {
obj.write(fd,b,off,len);
} catch(SQLException e) {
throw new IOException(e.toString());
}
}
public void close() throws IOException
{
try {
obj.close(fd);
} catch(SQLException e) {
throw new IOException(e.toString());
}
}
}

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src/interfaces/jdbc/postgresql/PGlseg.java Normal file
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/**
*
* This implements a lseg (line segment) consisting of two points
*
*/
package postgresql;
import java.io.*;
import java.sql.*;
public class PGlseg implements Serializable
{
/**
* These are the two points.
*/
public PGpoint point[] = new PGpoint[2];
public PGlseg(double x1,double y1,double x2,double y2)
{
this.point[0] = new PGpoint(x1,y1);
this.point[1] = new PGpoint(x2,y2);
}
public PGlseg(PGpoint p1,PGpoint p2)
{
this.point[0] = p1;
this.point[1] = p2;
}
/**
* This constructor is used by the driver.
*/
public PGlseg(String s) throws SQLException
{
PGtokenizer t = new PGtokenizer(PGtokenizer.removeBox(s),',');
if(t.getSize() != 2)
throw new SQLException("conversion of lseg failed - "+s);
point[0] = new PGpoint(t.getToken(0));
point[1] = new PGpoint(t.getToken(1));
}
public boolean equals(Object obj)
{
PGlseg p = (PGlseg)obj;
return (p.point[0].equals(point[0]) && p.point[1].equals(point[1])) ||
(p.point[0].equals(point[1]) && p.point[1].equals(point[0]));
}
/**
* This returns the lseg in the syntax expected by postgresql
*/
public String toString()
{
return "["+point[0]+","+point[1]+"]";
}
}

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src/interfaces/jdbc/postgresql/PGpath.java Normal file
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/**
*
* This implements a path (a multiple segmented line, which may be closed)
*
*/
package postgresql;
import java.io.*;
import java.sql.*;
public class PGpath implements Serializable
{
public int npoints;
public boolean open;
public PGpoint point[];
public PGpath(int num,PGpoint[] points,boolean open)
{
npoints = num;
this.point = points;
this.open = open;
}
/**
* This constructor is used by the driver.
*/
public PGpath(String s) throws SQLException
{
// First test to see if were open
if(s.startsWith("[") && s.endsWith("]")) {
open = true;
s = PGtokenizer.removeBox(s);
} else if(s.startsWith("(") && s.endsWith(")")) {
open = false;
s = PGtokenizer.removePara(s);
} else
throw new SQLException("cannot tell if path is open or closed");
PGtokenizer t = new PGtokenizer(s,',');
npoints = t.getSize();
point = new PGpoint[npoints];
for(int p=0;p<npoints;p++)
point[p] = new PGpoint(t.getToken(p));
}
public boolean equals(Object obj)
{
PGpath p = (PGpath)obj;
if(p.npoints != npoints)
return false;
if(p.open != open)
return false;
for(int i=0;i<npoints;i++)
if(!point[i].equals(p.point[i]))
return false;
return true;
}
/**
* This returns the polygon in the syntax expected by postgresql
*/
public String toString()
{
StringBuffer b = new StringBuffer(open?"[":"(");
for(int p=0;p<npoints;p++)
b.append(point[p].toString());
b.append(open?"]":")");
return b.toString();
}
public boolean isOpen()
{
return open;
}
public boolean isClosed()
{
return !open;
}
public void closePath()
{
open = false;
}
public void openPath()
{
open = true;
}
}

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/**
*
* This implements a version of java.awt.Point, except it uses double
* to represent the coordinates.
*
* It maps to the point datatype in postgresql.
*/
package postgresql;
import java.awt.Point;
import java.io.*;
import java.sql.*;
public class PGpoint implements Serializable
{
/**
* These are the coordinates.
* These are public, because their equivalents in java.awt.Point are
*/
public double x,y;
public PGpoint(double x,double y)
{
this.x = x;
this.y = y;
}
public PGpoint(PGpoint p)
{
this(p.x,p.y);
}
/**
* This constructor is used by the driver.
*/
public PGpoint(String s) throws SQLException
{
PGtokenizer t = new PGtokenizer(PGtokenizer.removePara(s),',');
try {
x = Double.valueOf(t.getToken(0)).doubleValue();
y = Double.valueOf(t.getToken(1)).doubleValue();
} catch(NumberFormatException e) {
throw new SQLException("conversion of point failed - "+e.toString());
}
}
public boolean equals(Object obj)
{
PGpoint p = (PGpoint)obj;
return x == p.x && y == p.y;
}
/**
* This returns the point in the syntax expected by postgresql
*/
public String toString()
{
return "("+x+","+y+")";
}
public void translate(int x,int y)
{
translate((double)x,(double)y);
}
public void translate(double x,double y)
{
this.x += x;
this.y += y;
}
public void move(int x,int y)
{
setLocation(x,y);
}
public void move(double x,double y)
{
this.x = x;
this.y = y;
}
// refer to java.awt.Point for description of this
public void setLocation(int x,int y)
{
move((double)x,(double)y);
}
// refer to java.awt.Point for description of this
public void setLocation(Point p)
{
setLocation(p.x,p.y);
}
}

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src/interfaces/jdbc/postgresql/PGpolygon.java Normal file
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/**
*
* This implements a polygon (based on java.awt.Polygon)
*
*/
package postgresql;
import java.io.*;
import java.sql.*;
public class PGpolygon implements Serializable
{
public int npoints;
public PGpoint point[];
public PGpolygon(int num,PGpoint[] points)
{
npoints = num;
this.point = points;
}
/**
* This constructor is used by the driver.
*/
public PGpolygon(String s) throws SQLException
{
PGtokenizer t = new PGtokenizer(PGtokenizer.removePara(s),',');
npoints = t.getSize();
point = new PGpoint[npoints];
for(int p=0;p<npoints;p++)
point[p] = new PGpoint(t.getToken(p));
}
public boolean equals(Object obj)
{
PGpolygon p = (PGpolygon)obj;
if(p.npoints != npoints)
return false;
for(int i=0;i<npoints;i++)
if(!point[i].equals(p.point[i]))
return false;
return true;
}
/**
* This returns the polygon in the syntax expected by postgresql
*/
public String toString()
{
StringBuffer b = new StringBuffer();
for(int p=0;p<npoints;p++)
b.append(point[p].toString());
return b.toString();
}
}

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/**
*
* This class is used to tokenize the text output of postgres.
*
*/
package postgresql;
import java.sql.*;
import java.util.*;
public class PGtokenizer
{
protected Vector tokens;
public PGtokenizer(String string,char delim)
{
tokenize(string,delim);
}
/**
* Tokenizes a new string
*/
public int tokenize(String string,char delim)
{
tokens = new Vector();
int nest=0,p,s;
for(p=0,s=0;p<string.length();p++) {
char c = string.charAt(p);
// increase nesting if an open character is found
if(c == '(' || c == '[')
nest++;
// decrease nesting if a close character is found
if(c == ')' || c == ']')
nest--;
if(nest==0 && c==delim) {
tokens.addElement(string.substring(s,p));
s=p+1; // +1 to skip the delimiter
}
}
// Don't forget the last token ;-)
if(s<string.length())
tokens.addElement(string.substring(s));
return tokens.size();
}
public int getSize()
{
return tokens.size();
}
public String getToken(int n)
{
return (String)tokens.elementAt(n);
}
/**
* This returns a new tokenizer based on one of our tokens
*/
public PGtokenizer tokenizeToken(int n,char delim)
{
return new PGtokenizer(getToken(n),delim);
}
/**
* This removes the lead/trailing strings from a string
*/
public static String remove(String s,String l,String t)
{
if(s.startsWith(l)) s = s.substring(l.length());
if(s.endsWith(t)) s = s.substring(0,s.length()-t.length());
return s;
}
/**
* This removes the lead/trailing strings from all tokens
*/
public void remove(String l,String t)
{
for(int i=0;i<tokens.size();i++) {
tokens.setElementAt(remove((String)tokens.elementAt(i),l,t),i);
}
}
public static String removePara(String s) {return remove(s,"(",")");}
public void removePara() {remove("(",")");}
public static String removeBox(String s) {return remove(s,"[","]");}
public void removeBox() {remove("[","]");}
public static String removeAngle(String s) {return remove(s,"<",">");}
public void removeAngle() {remove("<",">");}
}