gnu.x11.extension.XCMisc Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of escher Show documentation
Escher is a collection of libraries for X Window System written purely in Java.
The newest version!
package gnu.x11.extension;

import gnu.x11.RequestOutputStream;
import gnu.x11.ResponseInputStream;

/** 
 * XC-MISC Extension. The specification can be found here.
 */
public class XCMisc extends Extension {
  public static final String [] MINOR_OPCODE_STRINGS = {
    "GetVersion",               // 0
    "GetXIDRange",              // 1
    "GetXIDList"                // 2
  };


  public static final int CLIENT_MAJOR_VERSION = 1;
  public static final int CLIENT_MINOR_VERSION = 1;

  public int server_major_version, server_minor_version;


  // xc-misc opcode 0 - get version
  public XCMisc (gnu.x11.Display display) throws NotFoundException {
    super (display, "XC-MISC", MINOR_OPCODE_STRINGS); 

    // check version before any other operations
    RequestOutputStream o = display.out;
    synchronized (o) {

      o.begin_request (major_opcode, 0, 2);
      o.write_int16 (CLIENT_MAJOR_VERSION);
      o.write_int16 (CLIENT_MINOR_VERSION);
      ResponseInputStream i = display.in;
      synchronized (i) {
        i.read_reply (o);
        i.skip (8);
        server_major_version = i.read_int16 ();
        server_minor_version = i.read_int16 ();
        i.skip (20);
      }
    }
  }

  
  /** Reply of {@link XCMisc#xid_range()} */
  public static class XIDRange {
    public int start_id;
    public int count;
    XIDRange (ResponseInputStream i) {
      start_id = i.read_int32 ();
      count = i.read_int32 ();
    }
  }
  
  
  // xc-misc opcode 1 - get xid range
  public XIDRange xid_range () {
    XIDRange r;
    RequestOutputStream o = display.out;
    synchronized (o) {
      o.begin_request (major_opcode, 1, 1);
      ResponseInputStream i = display.in;
      synchronized (i) {
        i.read_reply (o);
        i.skip (8);
        r = new XIDRange (i);
        i.skip (16);
      }
    }
    return r;
  }


  // xc-misc opcode 2 - get xid list
  public int [] xid_list (int count) {

    int [] ids;
    RequestOutputStream o = display.out;
    synchronized (o) {
      o.begin_request (major_opcode, 2, 2);
      ResponseInputStream i = display.in;
      synchronized (i) {
        i.read_reply (o);
        i.skip (8);
        int num = i.read_int32 ();
        i.skip (20);
        ids = new int [num];
        for (int j = 0; j < num; j++)
          ids [j] = i.read_int32 ();
      }
    }
    return ids;
  }


  public String more_string () {
    return "\n  client-version: " 
      + CLIENT_MAJOR_VERSION + "." + CLIENT_MINOR_VERSION
      + "\n  server-version: "
      + server_major_version + "." + server_minor_version;
  }
}