gcc/libjava/classpath/gnu/javax/print/CupsServer.java

/* CupsServer.java -- 
   Copyright (C) 2006 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
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permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
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this exception to your version of the library, but you are not
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exception statement from your version. */


package gnu.javax.print;

import gnu.javax.print.ipp.IppException;
import gnu.javax.print.ipp.IppPrintService;
import gnu.javax.print.ipp.IppRequest;
import gnu.javax.print.ipp.IppResponse;
import gnu.javax.print.ipp.attribute.RequestedAttributes;
import gnu.javax.print.ipp.attribute.supported.PrinterUriSupported;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * <code>CupsServer</code> represents a host running a cups
 * compatible server. It mainly consists of its URI and optional
 * user and password combination if access is restricted.
 * <p>
 * It provides methods for retrival of valid CUPS printer uris 
 * that are used to construct IppPrintService objects.
 * </p>
 * 
 * @author Wolfgang Baer (WBaer@gmx.de)
 */
public class CupsServer
{
  /** 
   * The URI of the CUPS server.
   * This is something like: http://localhost:631
   */
  private transient URI uri;
  
  /**
   * The optional username.
   */
  private transient String username;
  
  /**
   * The optional password for the user.
   */
  private transient String password;

  /**
   * Creates a <code>CupsServer</code> object which
   * tries to connect to the cups server on localhost.
   * 
   * @param username the username
   * @param password the password for the username.
   */
  public CupsServer(String username, String password)
  {
    try
      {
        this.uri = new URI("http://localhost:631");
      }
    catch (URISyntaxException e)
      {
        // does not happen
      }
    
    this.username = username;
    this.password = password;
  }
 
  /**
   * Creates a <code>CupsServer</code> object which
   * tries to connect to a running cups server on the
   * given URI.
   * 
   * @param uri the URI of the server.
   * @param username the username
   * @param password the password for the username.
   */
  public CupsServer(URI uri, String username, String password)
  {
    this.uri = uri;
    this.username = username;
    this.password = password;
  }
  
  /**
   * Requests the default printer from this CUPS server.
   * This is always returned as IppPrintService.
   * 
   * @return The default printer.
   * @throws IppException if problems during request/response processing occur.
   */
  public IppPrintService getDefaultPrinter() throws IppException
  {   
    IppResponse response = null;
   
    try
      {
        IppRequest request = new IppRequest(uri, username, password);    
        request.setOperationID((short)CupsIppOperation.CUPS_GET_DEFAULT);        
        request.setOperationAttributeDefaults();    
        
        RequestedAttributes requestedAttrs 
         = new RequestedAttributes("printer-uri-supported");
        request.addOperationAttribute(requestedAttrs);
        
        response = request.send();
      }   
    catch (IOException e)
      {
        throw new IppException("IOException in IPP request/response.", e);
      }    
        
    Map printerAttributes = (Map) response.getPrinterAttributes().get(0);
    Set uris = (Set) printerAttributes.get(PrinterUriSupported.class);
    PrinterUriSupported uri = (PrinterUriSupported) uris.toArray()[0];
    
    IppPrintService service 
      = new CupsPrintService(uri.getURI(), username, password);
    
    return service;
  }
  
  /**
   * Requests all printers from this CUPS server.
   * 
   * @return The list of available printers.
   * @throws IppException if problems during request/response processing occur.
   */
  public List getAllPrinters() throws IppException
  {   
    IppResponse response = null;
   
    try
      {
        IppRequest request = new IppRequest(uri, username, password);    
        request.setOperationID((short)CupsIppOperation.CUPS_GET_PRINTERS);        
        request.setOperationAttributeDefaults();
        
        RequestedAttributes requestedAttrs 
          = new RequestedAttributes("printer-uri-supported");
        request.addOperationAttribute(requestedAttrs);
        
        response = request.send();
      }   
    catch (IOException e)
      {
        throw new IppException("IOException in IPP request/response.", e);
      }    

    List prAttr = response.getPrinterAttributes();
    List services = new ArrayList();
    
    for (int i=0; i < prAttr.size(); i++)
      {
        Map printerAttributes = (Map) prAttr.get(i);
        Set uris = (Set) printerAttributes.get(PrinterUriSupported.class);
        PrinterUriSupported uri = (PrinterUriSupported) uris.toArray()[0];
        
        try
          {
            CupsPrintService cups = new CupsPrintService(uri.getURI(),
                                                         username, password);
            services.add(cups);
          }
        catch (IppException e)
          {
            // do nothing, we only catch the IppException which could be
            // thrown during instantiation as single printers may be discovered
            // correctly but not usable due to other security restrictions
          }       
      }    
                     
    return services;
  }
  
  /**
   * Requests all classes from this CUPS server. Classes in cups are
   * collections of printers. This means jobs directed to a class 
   * are forwarded to the first available printer of the collection.
   * 
   * @return The list of available classes.
   * @throws IppException if problems during request/response processing occur.
   */
  public List getAllClasses() throws IppException
  {   
    IppResponse response = null;
   
    try
      {
        IppRequest request = new IppRequest(uri, username, password);    
        request.setOperationID((short)CupsIppOperation.CUPS_GET_CLASSES);        
        request.setOperationAttributeDefaults();
        
        RequestedAttributes requestedAttrs 
          = new RequestedAttributes("printer-uri-supported");
        request.addOperationAttribute(requestedAttrs);
        
        response = request.send();
      }   
    catch (IOException e)
      {
        throw new IppException("IOException in IPP request/response.", e);
      }    
    
    List prAttr = response.getPrinterAttributes();
    List services = new ArrayList();   
    
    for (int i=0; i < prAttr.size(); i++)
      {
        Map printerAttributes = (Map) prAttr.get(i);
        Set uris = (Set) printerAttributes.get(PrinterUriSupported.class);
        PrinterUriSupported uri = (PrinterUriSupported) uris.toArray()[0];
        
        try
          {
            CupsPrintService cups = new CupsPrintService(uri.getURI(),
                                                         username, password);
            services.add(cups);
          }
        catch (IppException e)
          {
            // do nothing, we only catch the IppException which could be
            // thrown during instantiation as single printers may be discovered
            // correctly but not usable due to other security restrictions
          }        
      }    
                     
    return services;
  }

}