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+/* Event.java -- a base class for all event types
+ Copyright (C) 2005, 2007 Free Software Foundation
+
+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
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.classpath.jdwp.event;
+
+import gnu.classpath.jdwp.JdwpConstants;
+import gnu.classpath.jdwp.transport.JdwpCommandPacket;
+import gnu.classpath.jdwp.transport.JdwpPacket;
+
+import java.io.DataOutputStream;
+import java.io.IOException;
+
+/**
+ * This class is a base class for all VM->debugger event
+ * notifications.
+ *
+ * @author Keith Seitz (keiths@redhat.com)
+ */
+public abstract class Event
+{
+ /**
+ * The class of the object in which the event occurred
+ */
+ public static final int EVENT_CLASS = 1;
+
+ /**
+ * The thread where the event occurred
+ */
+ public static final int EVENT_THREAD = 2;
+
+ /**
+ * The location where an event occurred
+ */
+ public static final int EVENT_LOCATION = 3;
+
+ /**
+ * The instance of the class where the event occurred
+ */
+ public static final int EVENT_INSTANCE = 4;
+
+ /**
+ * The field acted on by an event
+ */
+ public static final int EVENT_FIELD = 5;
+
+ /**
+ * The class of the exception for ExceptionEvent
+ */
+ public static final int EVENT_EXCEPTION_CLASS = 6;
+
+ /**
+ * Whether this exception was caught (only valid for ExceptionEvents)
+ */
+ public static final int EVENT_EXCEPTION_CAUGHT = 7;
+
+ // The kind of event represented by this event
+ private byte _eventKind;
+
+ /**
+ * Constructs an <code>Event</code> of the given kind
+ *
+ * @param kind the type of event
+ */
+ public Event (byte kind)
+ {
+ _eventKind = kind;
+ }
+
+ /**
+ * Returns the event type of this event
+ *
+ * @returns the event kind
+ */
+ public byte getEventKind ()
+ {
+ return _eventKind;
+ }
+
+ /**
+ * Abstract function used by implementing classes to fill in the
+ * event-specific data. Note that request ID is automatically added
+ * by this class (since it appears in all event notifications).
+ *
+ * @param outStream the stream to which to write data
+ */
+ protected abstract void _writeData (DataOutputStream outStream)
+ throws IOException;
+
+ /**
+ * Returns a specific filtering parameter for this event. For example,
+ * most events may be filtered by thread. Consequently, a call to this
+ * method with <code>ThreadId.class</code> should return a
+ * <code>Thread</code>.
+ *
+ * @param type the type of parameter to return
+ * @returns the parameter (not the ID) or <code>null</code> if none is
+ * is defined for this event
+ */
+ public abstract Object getParameter (int type);
+
+ /**
+ * Converts the events into to a single JDWP Event.COMPOSITE packet
+ *
+ * @param dos the stream to which to write data
+ * @param events the events to package into the packet
+ * @param requests the corresponding event requests
+ * @param suspendPolicy the suspend policy enforced by the VM
+ * @returns a <code>JdwpPacket</code> of the events
+ */
+ public static JdwpPacket toPacket (DataOutputStream dos,
+ Event[] events,
+ EventRequest[] requests,
+ byte suspendPolicy)
+ {
+ JdwpPacket pkt;
+ try
+ {
+ dos.writeByte (suspendPolicy);
+ dos.writeInt (events.length);
+ for (int i = 0; i < events.length; ++i)
+ _toData (dos, events[i], requests[i]);
+
+ pkt
+ = new JdwpCommandPacket (JdwpConstants.CommandSet.Event.CS_VALUE,
+ JdwpConstants.CommandSet.Event.COMPOSITE);
+ }
+ catch (IOException ioe)
+ {
+ pkt = null;
+ }
+
+ return pkt;
+ }
+
+ // Helper function for toPacket
+ private static void _toData (DataOutputStream dos, Event event,
+ EventRequest request)
+ throws IOException
+ {
+ dos.writeByte (event._eventKind);
+ dos.writeInt (request.getId ());
+ event._writeData (dos);
+ }
+}