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package org.eclipse.team.internal.ccvs.core.connection;
/*
* (c) Copyright IBM Corp. 2000, 2002.
* All Rights Reserved.
*/
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.team.ccvs.core.ICVSRepositoryLocation;
import org.eclipse.team.ccvs.core.IServerConnection;
import org.eclipse.team.internal.ccvs.core.CVSException;
import org.eclipse.team.internal.ccvs.core.Policy;
/**
* A connection to talk to a cvs server. The life cycle of a connection is
* as follows:
* <ul>
* <li> constructor: creates a new connection object that wraps the given
* repository location and connection method.
* <li> open: opens a connection.
* <li> send a request: use write* method or use the request stream directly.
* <code>GetRequestStream</code> returns an output stream to directly
* talk to the server.
* <li> read responses: use read* methods or use the response stream directly.
* <code>GetResponseStream</code> returns an input stream to directly
* read output from the server.
* <li> close: closes the connection. A closed connection can be reopened by
* calling open again.
* </ul>
*/
public class Connection {
private static final boolean DEBUG =
(System.getProperty("eclipse.cvs.debug") == null) ? false : //$NON-NLS-1$
(new Boolean(System.getProperty("eclipse.cvs.debug")).booleanValue());//$NON-NLS-1$
private static final byte NEWLINE= 0xA;
private IServerConnection serverConnection;
private ICVSRepositoryLocation fCVSRoot;
private String fCVSRootDirectory;
private boolean fIsEstablished;
private BufferedInputStream fResponseStream;
private byte[] readLineBuffer = new byte[256];
public Connection(ICVSRepositoryLocation cvsroot, IServerConnection serverConnection) {
fCVSRoot = cvsroot;
this.serverConnection = serverConnection;
}
private static byte[] append(byte[] buffer, int index, byte b) {
if (index >= buffer.length) {
byte[] newBuffer= new byte[index * 2];
System.arraycopy(buffer, 0, newBuffer, 0, buffer.length);
buffer= newBuffer;
}
buffer[index]= b;
return buffer;
}
/**
* Closes the connection.
*/
public void close() throws CVSException {
if (!isEstablished())
return;
try {
// Perhaps it should be left to the connection to deal with reading pending input!
readPendingInput();
serverConnection.close();
} catch (IOException ex) {
throw new CVSCommunicationException(Policy.bind("Connection.cannotClose"), ex);//$NON-NLS-1$
} finally {
fResponseStream= null;
fIsEstablished= false;
}
}
/**
* Flushes the request stream.
*/
public void flush() throws CVSException {
if (!isEstablished())
return;
try {
getOutputStream().flush();
} catch(IOException e) {
throw new CVSCommunicationException(e);
}
}
/**
* Returns the <code>OutputStream</code> used to send requests
* to the server.
*/
public OutputStream getOutputStream() throws CVSException {
if (!isEstablished())
return null;
return serverConnection.getOutputStream();
}
/**
* Returns the <code>InputStream</code> used to read responses from
* the server.
*/
public InputStream getInputStream() throws CVSException {
if (!isEstablished())
return null;
if (fResponseStream == null)
fResponseStream = new BufferedInputStream(serverConnection.getInputStream());
return fResponseStream;
}
/**
* Returns <code>true</code> if the connection is established;
* otherwise <code>false</code>.
*/
public boolean isEstablished() {
return fIsEstablished;
}
/**
* Opens the connection.
*/
public void open(IProgressMonitor monitor) throws CVSException {
if (isEstablished())
return;
try {
serverConnection.open(monitor);
} catch (IOException e) {
throw new CVSCommunicationException(e);
}
fIsEstablished= true;
}
/**
* Reads a line from the response stream.
*/
public String readLine() throws CVSException {
if (!isEstablished())
throw new CVSCommunicationException(Policy.bind("Connection.readUnestablishedConnection"));//$NON-NLS-1$
try {
InputStream in = getInputStream();
int index = 0;
int r;
while ((r = in.read()) != -1) {
if (r == NEWLINE) break;
readLineBuffer = append(readLineBuffer, index++, (byte) r);
}
String result = new String(readLineBuffer, 0, index);
if (DEBUG) System.out.println(result);
return result;
} catch (IOException e) {
throw new CVSCommunicationException(e);
}
}
static String readLine(InputStream in) throws IOException {
byte[] buffer = new byte[256];
int index = 0;
int r;
while ((r = in.read()) != -1) {
if (r == NEWLINE)
break;
buffer = append(buffer, index++, (byte) r);
}
String result = new String(buffer, 0, index);
if (DEBUG)
System.out.println(result);
return result;
}
/**
* Reads any pending input from the response stream so that
* the stream can savely be closed.
*/
protected void readPendingInput() throws CVSException {
byte[] buffer= new byte[2048];
InputStream in= getInputStream();
OutputStream out= getOutputStream();
try {
while (true) {
int available = in.available();
if (available < 1) break;
if (available > buffer.length) available = buffer.length;
if (in.read(buffer, 0, available) < 1) break;
}
out.flush();
while (true) {
int available = in.available();
if (available < 1) break;
if (available > buffer.length) available = buffer.length;
if (in.read(buffer, 0, available) < 1) break;
}
} catch (IOException e) {
throw new CVSCommunicationException(e);
}
}
//---- Helper to send strings to the server ----------------------------
/**
* Sends the given string to the server.
*/
public void write(String s) throws CVSException {
write(s, false);
}
/**
* Sends the given string and a newline to the server.
*/
public void writeLine(String s) throws CVSException {
write(s, true);
}
/**
* Low level method to write a string to the server. All write* methods are
* funneled through this method.
*/
void write(String s, boolean newline) throws CVSException {
if (!isEstablished())
throw new CVSCommunicationException(Policy.bind("Connection.writeUnestablishedConnection"));//$NON-NLS-1$
if (DEBUG)
System.out.print(s + (newline ? "\n" : ""));//$NON-NLS-1$ //$NON-NLS-2$
try {
OutputStream out= getOutputStream();
out.write(s.getBytes());
if (newline)
out.write(NEWLINE);
out.flush();
} catch (IOException e) {
throw new CVSCommunicationException(e);
}
}
}
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