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/* ReferenceTypeCommandSet.java -- class to implement the ReferenceType

   Command Set

   Copyright (C) 2005, 2006, 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

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.processor;

import gnu.classpath.jdwp.JdwpConstants;

import gnu.classpath.jdwp.VMMethod;

import gnu.classpath.jdwp.VMVirtualMachine;

import gnu.classpath.jdwp.exception.InvalidFieldException;

import gnu.classpath.jdwp.exception.JdwpException;

import gnu.classpath.jdwp.exception.JdwpInternalErrorException;

import gnu.classpath.jdwp.exception.NotImplementedException;

import gnu.classpath.jdwp.id.ObjectId;

import gnu.classpath.jdwp.id.ReferenceTypeId;

import gnu.classpath.jdwp.util.JdwpString;

import gnu.classpath.jdwp.util.Signature;

import gnu.classpath.jdwp.value.Value;

import gnu.classpath.jdwp.value.ValueFactory;

import java.io.DataOutputStream;

import java.io.IOException;

import java.lang.reflect.Field;

import java.nio.ByteBuffer;

/**

 * A class representing the ReferenceType Command Set.

 *

 * @author Aaron Luchko <aluchko@redhat.com>

 */

public class ReferenceTypeCommandSet

  extends CommandSet

{

  public boolean runCommand(ByteBuffer bb, DataOutputStream os, byte command)

    throws JdwpException

  {

    try

      {

        switch (command)

          {

          case JdwpConstants.CommandSet.ReferenceType.SIGNATURE:

            executeSignature(bb, os);

            break;

          case JdwpConstants.CommandSet.ReferenceType.CLASS_LOADER:

            executeClassLoader(bb, os);

            break;

          case JdwpConstants.CommandSet.ReferenceType.MODIFIERS:

            executeModifiers(bb, os);

            break;

          case JdwpConstants.CommandSet.ReferenceType.FIELDS:

            executeFields(bb, os);

            break;

          case JdwpConstants.CommandSet.ReferenceType.METHODS:

            executeMethods(bb, os);

            break;

          case JdwpConstants.CommandSet.ReferenceType.GET_VALUES:

            executeGetValues(bb, os);

            break;

          case JdwpConstants.CommandSet.ReferenceType.SOURCE_FILE:

            executeSourceFile(bb, os);

            break;

          case JdwpConstants.CommandSet.ReferenceType.NESTED_TYPES:

            executeNestedTypes(bb, os);

            break;

          case JdwpConstants.CommandSet.ReferenceType.STATUS:

            executeStatus(bb, os);

            break;

          case JdwpConstants.CommandSet.ReferenceType.INTERFACES:

            executeInterfaces(bb, os);

            break;

          case JdwpConstants.CommandSet.ReferenceType.CLASS_OBJECT:

            executeClassObject(bb, os);

            break;

          case JdwpConstants.CommandSet.ReferenceType.SOURCE_DEBUG_EXTENSION:

            executeSourceDebugExtension(bb, os);

            break;

          case JdwpConstants.CommandSet.ReferenceType.SIGNATURE_WITH_GENERIC:

            executeSignatureWithGeneric(bb, os);

            break;

          case JdwpConstants.CommandSet.ReferenceType.FIELDS_WITH_GENERIC:

            executeFieldWithGeneric(bb, os);

            break;

          case JdwpConstants.CommandSet.ReferenceType.METHODS_WITH_GENERIC:

            executeMethodsWithGeneric(bb, os);

            break;

          default:

            throw new NotImplementedException("Command " + command +

              " not found in ReferenceType Command Set.");

          }

      }

    catch (IOException ex)

      {

        // The DataOutputStream we're using isn't talking to a socket at all

        // So if we throw an IOException we're in serious trouble

        throw new JdwpInternalErrorException(ex);

      }

    return false;

  }

  private void executeSignature(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    ReferenceTypeId refId = idMan.readReferenceTypeId(bb);

    String sig = Signature.computeClassSignature(refId.getType());

    JdwpString.writeString(os, sig);

  }

  private void executeClassLoader(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    ReferenceTypeId refId = idMan.readReferenceTypeId(bb);

    Class clazz = refId.getType();

    ClassLoader loader = clazz.getClassLoader();

    ObjectId oid = idMan.getObjectId(loader);

    oid.write(os);

  }

  private void executeModifiers(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    ReferenceTypeId refId = idMan.readReferenceTypeId(bb);

    Class clazz = refId.getType();

    os.writeInt(clazz.getModifiers());

  }

  private void executeFields(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    ReferenceTypeId refId = idMan.readReferenceTypeId(bb);

    Class clazz = refId.getType();

    Field[] fields = clazz.getFields();

    os.writeInt(fields.length);

    for (int i = 0; i < fields.length; i++)

      {

        Field field = fields[i];

        idMan.getObjectId(field).write(os);

        JdwpString.writeString(os, field.getName());

        JdwpString.writeString(os, Signature.computeFieldSignature(field));

        os.writeInt(field.getModifiers());

      }

  }

  private void executeMethods(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    ReferenceTypeId refId = idMan.readReferenceTypeId(bb);

    Class clazz = refId.getType();

    VMMethod[] methods = VMVirtualMachine.getAllClassMethods(clazz);

    os.writeInt (methods.length);

    for (int i = 0; i < methods.length; i++)

      {

        VMMethod method = methods[i];

        method.writeId(os);

        JdwpString.writeString(os, method.getName());

        JdwpString.writeString(os, method.getSignature());

        os.writeInt(method.getModifiers());

      }

  }

  private void executeGetValues(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    ReferenceTypeId refId = idMan.readReferenceTypeId(bb);

    Class clazz = refId.getType();

    int numFields = bb.getInt();

    os.writeInt(numFields); // Looks pointless but this is the protocol

    for (int i = 0; i < numFields; i++)

      {

        ObjectId fieldId = idMan.readObjectId(bb);

        Field field = (Field) (fieldId.getObject());

        Class fieldClazz = field.getDeclaringClass();

        // We don't actually need the clazz to get the field but we might as

        // well check that the debugger got it right

        if (fieldClazz.isAssignableFrom(clazz))

          {

            try

              {

                field.setAccessible(true); // Might be a private field

                Object value = field.get(null);

                Value val = ValueFactory.createFromObject(value,

                                                          field.getType());

                val.writeTagged(os);

              }

            catch (IllegalArgumentException ex)

              {

                // I suppose this would best qualify as an invalid field then

                throw new InvalidFieldException(ex);

              }

            catch (IllegalAccessException ex)

              {

                // Since we set it as accessible this really shouldn't happen

                throw new JdwpInternalErrorException(ex);

              }

          }

        else

          throw new InvalidFieldException(fieldId.getId());

      }

  }

  private void executeSourceFile(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    ReferenceTypeId refId = idMan.readReferenceTypeId(bb);

    Class clazz = refId.getType();

    // We'll need to go into the jvm for this unless there's an easier way

    String sourceFileName = VMVirtualMachine.getSourceFile(clazz);

    JdwpString.writeString(os, sourceFileName);

    // clazz.getProtectionDomain().getCodeSource().getLocation();

  }

  private void executeNestedTypes(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    ReferenceTypeId refId = idMan.readReferenceTypeId(bb);

    Class clazz = refId.getType();

    Class[] declaredClazzes = clazz.getDeclaredClasses();

    os.writeInt(declaredClazzes.length);

    for (int i = 0; i < declaredClazzes.length; i++)

      {

        Class decClazz = declaredClazzes[i];

        ReferenceTypeId clazzId = idMan.getReferenceTypeId(decClazz);

        clazzId.writeTagged(os);

      }

  }

  private void executeStatus(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    ReferenceTypeId refId = idMan.readReferenceTypeId(bb);

    Class clazz = refId.getType();

    // I don't think there's any other way to get this

    int status = VMVirtualMachine.getClassStatus(clazz);

    os.writeInt(status);

  }

  private void executeInterfaces(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    ReferenceTypeId refId = idMan.readReferenceTypeId(bb);

    Class clazz = refId.getType();

    Class[] interfaces = clazz.getInterfaces();

    os.writeInt(interfaces.length);

    for (int i = 0; i < interfaces.length; i++)

      {

        Class interfaceClass = interfaces[i];

        ReferenceTypeId intId = idMan.getReferenceTypeId(interfaceClass);

        intId.write(os);

      }

  }

  private void executeClassObject(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    ReferenceTypeId refId = idMan.readReferenceTypeId(bb);

    Class clazz = refId.getType();

    ObjectId clazzObjectId = idMan.getObjectId(clazz);

    clazzObjectId.write(os);

  }

  private void executeSourceDebugExtension(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    if (!VMVirtualMachine.canGetSourceDebugExtension)

      {

        String msg = "source debug extension is not supported";

        throw new NotImplementedException(msg);

      }

    ReferenceTypeId id = idMan.readReferenceTypeId(bb);

    String ext = VMVirtualMachine.getSourceDebugExtension (id.getType());

    JdwpString.writeString(os, ext);

  }

  private void executeSignatureWithGeneric(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    // We don't have generics yet

    throw new NotImplementedException(

      "Command SignatureWithGeneric not implemented.");

  }

  private void executeFieldWithGeneric(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    // We don't have generics yet

    throw new NotImplementedException(

      "Command executeFieldWithGeneric not implemented.");

  }

  private void executeMethodsWithGeneric(ByteBuffer bb, DataOutputStream os)

    throws JdwpException, IOException

  {

    // We don't have generics yet

    throw new NotImplementedException(

      "Command executeMethodsWithGeneric not implemented.");

  }

}