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jeremybenn |
/* JdwpId.java -- base class for all object ID types
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Copyright (C) 2005, 2006 Free Software Foundation
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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.id;
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import java.io.DataOutputStream;
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import java.io.IOException;
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import java.lang.ref.SoftReference;
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/**
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* A baseclass for all object types reported to the debugger
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*
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* @author Keith Seitz <keiths@redhat.com>
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*/
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public abstract class JdwpId
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{
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/**
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* The size of an ID. The default is 8 bytes (a long).
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*/
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public static final int SIZE = 8;
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/**
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* ID assigned to this object
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*/
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protected long _id;
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/**
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* Tag of ID's type (see {@link gnu.classpath.jdwp.JdwpConstants.Tag})
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* for object-like IDs or the type tag (see {@link
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* gnu.classpath.jdwp.JdwpConstants.TypeTag}) for reference type IDs.
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*/
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private byte _tag;
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/**
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* The object/class represented by this Id
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*/
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protected SoftReference _reference;
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/**
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* Constructs an empty <code>JdwpId</code>
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*/
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public JdwpId (byte tag)
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{
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_tag = tag;
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}
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/**
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* Sets the id for this object reference
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*/
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public void setId (long id)
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{
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_id = id;
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}
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/**
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* Returns the id for this object reference
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*/
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public long getId ()
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{
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return _id;
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}
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/**
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* Gets the object/class reference for this ID
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*
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* @returns a refernce to the object or class
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*/
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public SoftReference getReference ()
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{
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return _reference;
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}
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/**
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* Sets the object/class reference for this ID
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*
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* @param ref a refernce to the object or class
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*/
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public void setReference (SoftReference ref)
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{
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_reference = ref;
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}
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/**
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* Compares two object ids for equality. Two object ids
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* are equal if they point to the same type and contain to
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* the same id number.
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*/
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public boolean equals (JdwpId id)
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{
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return (id.getId () == getId ());
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}
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/**
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* Writes the contents of this type to the <code>DataOutputStream</code>
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* @param outStream the <code>DataOutputStream</code> to use
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* @throws IOException when an error occurs on the <code>OutputStream</code>
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*/
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public abstract void write (DataOutputStream outStream)
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throws IOException;
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/**
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* Writes the contents of this type to the output stream, preceded
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* by a one-byte tag for tagged object IDs or type tag for
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* reference type IDs.
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*
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* @param outStream the <code>DataOutputStream</code> to use
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* @throws IOException when an error occurs on the <code>OutputStream</code>
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*/
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public void writeTagged (DataOutputStream outStream)
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throws IOException
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{
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outStream.writeByte (_tag);
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write (outStream);
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}
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}
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