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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libjava/] [classpath/] [vm/] [reference/] [gnu/] [classpath/] [jdwp/] [VMMethod.java] - Blame information for rev 780

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1 780 jeremybenn
/* VMMethod.java -- a method in a virtual machine
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   Copyright (C) 2006, 2007 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING.  If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library.  Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module.  An independent module is a module which is not derived from
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or based on this library.  If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so.  If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.classpath.jdwp;
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import java.io.DataOutputStream;
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import java.io.IOException;
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import java.nio.ByteBuffer;
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import gnu.classpath.jdwp.exception.JdwpException;
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import gnu.classpath.jdwp.util.LineTable;
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import gnu.classpath.jdwp.util.VariableTable;
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/**
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 * This class is really an amalgamation of two classes: one class
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 * represents a virtual machine method and the other represents
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 * the JDWP back-end's ID for the method.
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 *
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 * @author Keith Seitz  (keiths@redhat.com)
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 */
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public class VMMethod
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{
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  /**
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   * Returns the size of a JDWP method ID
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   * @see gnu.classpath.jdwp.id.JdwpId#SIZE
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   */
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   public static final int SIZE = 8;
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  // The class in which this method is declared
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  private Class _class;
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  // The method's ID
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  private long _methodId;
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  /**
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   * Constructs a new VMMethod object. This constructor is protected
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   * so that only the factory methods of VMVirtualMachine can be used
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   * to create VMMethods.
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   *
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   * @param klass the method's containing class
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   * @param id    method identifier, e.g., jmethodID
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   * @see gnu.classpath.jdwp.VMVirtualMachine#getAllClassMethods
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   * @see gnu.classpath.jdwp.VMVirtualMachine#getClassMethod
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   */
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  protected VMMethod(Class klass, long id)
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  {
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    _class = klass;
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    _methodId = id;
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  }
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  /**
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   * Returns the internal method ID for this method
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   */
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  public long getId()
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  {
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    return _methodId;
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  }
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  /**
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   * Returns the method's declaring class
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   */
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  public Class getDeclaringClass()
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  {
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    return _class;
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  }
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  /**
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   * Returns the name of this method
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   */
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  public native String getName();
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  /**
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   * Returns the signature of this method
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   */
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  public native String getSignature();
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  /**
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   * Returns the method's modifier flags
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   */
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  public native int getModifiers();
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  /**
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   * "Returns line number information for the method, if present. The line
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   * table maps source line numbers to the initial code index of the line.
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   * The line table is ordered by code index (from lowest to highest). The
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   * line number information is constant unless a new class definition is
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   * installed using RedefineClasses."
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   *
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   * @return the line table
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   * @throws JdwpException
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   */
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  public native LineTable getLineTable()
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    throws JdwpException;
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  /**
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   * "Returns variable information for the method. The variable table
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   * includes arguments and locals declared within the method. For instance
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   * methods, the "this" reference is included in the table. Also, synthetic
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   * variables may be present."
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   *
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   * @return the variable table
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   * @throws JdwpException
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   */
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  public native VariableTable getVariableTable()
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    throws JdwpException;
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  /**
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   * Returns a string representation of this method (not
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   * required but nice for debugging).
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   */
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  public String toString()
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  {
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    return getDeclaringClass().getName() + "." + getName();
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  }
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  /**
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   * Writes the method's ID to the output stream
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   *
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   * @param ostream the output stream to which to write
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   * @throws IOException for any errors writing to the stream
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   * @see gnu.classpath.jdwp.id.JdwpId#write
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   */
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  public void writeId(DataOutputStream ostream)
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    throws IOException
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  {
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    ostream.writeLong(getId());
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  }
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  /**
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   * Returns a VMMethod from the ID in the byte buffer
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   *
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   * @param klass the method's declaring class
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   * @param bb    a ByteBuffer containing the method's ID
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   * @throws JdwpException for any errors creating the method
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   * @throws IOException for any errors reading from the buffer
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   */
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  public static VMMethod readId(Class klass, ByteBuffer bb)
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    throws JdwpException, IOException
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  {
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    return VMVirtualMachine.getClassMethod(klass, bb.getLong());
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  }
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  public boolean equals(Object obj)
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  {
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    if (obj instanceof VMMethod)
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      {
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        VMMethod m = (VMMethod) obj;
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        return (getId() == m.getId());
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      }
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    return false;
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  }
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}

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