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Common Lisp implementation running on the JVM
/*
* Condition.java
*
* Copyright (C) 2003-2007 Peter Graves
* $Id$
*
* This program 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
* of the License, or (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* 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 org.armedbear.lisp;
import static org.armedbear.lisp.Lisp.*;
public class Condition extends StandardObject
{
protected String message;
public Condition()
{
super(StandardClass.CONDITION);
Debug.assertTrue(slots.length == 2);
setFormatArguments(NIL);
}
protected Condition(LispClass cls)
{
super(cls);
Debug.assertTrue(slots.length >= 2);
setFormatArguments(NIL);
}
public Condition(LispClass cls, int length)
{
super(cls, length);
}
public Condition(LispObject initArgs)
{
super(StandardClass.CONDITION);
Debug.assertTrue(slots.length == 2);
initialize(initArgs);
}
protected void initialize(LispObject initArgs)
{
LispObject control = null;
LispObject arguments = null;
LispObject first, second;
while (initArgs instanceof Cons)
{
first = initArgs.car();
initArgs = initArgs.cdr();
second = initArgs.car();
initArgs = initArgs.cdr();
if (first == Keyword.FORMAT_CONTROL)
{
if (control == null)
control = second;
}
else if (first == Keyword.FORMAT_ARGUMENTS)
{
if (arguments == null)
arguments = second;
}
}
if (control != null)
setFormatControl(control);
if (arguments == null)
arguments = NIL;
setFormatArguments(arguments);
}
public Condition(String message)
{
super(StandardClass.CONDITION);
Debug.assertTrue(slots.length == 2);
setFormatControl(message.replaceAll("~","~~"));
setFormatArguments(NIL);
}
public final LispObject getFormatControl()
{
return getInstanceSlotValue(Symbol.FORMAT_CONTROL);
}
public final void setFormatControl(LispObject formatControl)
{
setInstanceSlotValue(Symbol.FORMAT_CONTROL, formatControl);
}
public final void setFormatControl(String s)
{
setFormatControl(new SimpleString(s));
}
public final LispObject getFormatArguments()
{
return getInstanceSlotValue(Symbol.FORMAT_ARGUMENTS);
}
public final void setFormatArguments(LispObject formatArguments)
{
setInstanceSlotValue(Symbol.FORMAT_ARGUMENTS, formatArguments);
}
/**
* Extending classes should override this method if they want to
* customize how they will be printed.
*/
public String getMessage()
{
return null;
}
@Override
public LispObject typeOf()
{
LispObject c = getLispClass();
if (c instanceof LispClass)
return ((LispClass)c).getName();
else if (c != null)
return Symbol.CLASS_NAME.execute(c);
return Symbol.CONDITION;
}
@Override
public LispObject classOf()
{
LispObject c = getLispClass();
if (c != null)
return c;
return StandardClass.CONDITION;
}
@Override
public LispObject typep(LispObject type)
{
if (type == Symbol.CONDITION)
return T;
if (type == StandardClass.CONDITION)
return T;
return super.typep(type);
}
public String getConditionReport()
{
String s = getMessage();
if (s != null)
return s;
LispObject formatControl = getFormatControl();
if (formatControl != NIL)
{
return format(formatControl, getFormatArguments());
}
return unreadableString(typeOf().princToString());
}
@Override
public final String printObject()
{
final LispThread thread = LispThread.currentThread();
if (Symbol.PRINT_ESCAPE.symbolValue(thread) == NIL)
{
String s = getMessage();
if (s != null)
return s;
LispObject formatControl = getFormatControl();
if (formatControl instanceof Function)
{
StringOutputStream stream = new StringOutputStream();
Symbol.APPLY.execute(formatControl, stream, getFormatArguments());
return stream.getString().getStringValue();
}
if (formatControl instanceof AbstractString)
{
LispObject f = Symbol.FORMAT.getSymbolFunction();
if (f == null || f instanceof Autoload)
return format(formatControl, getFormatArguments());
return Symbol.APPLY.execute(f, NIL, formatControl, getFormatArguments()).getStringValue();
}
}
final int maxLevel;
LispObject printLevel = Symbol.PRINT_LEVEL.symbolValue(thread);
if (printLevel instanceof Fixnum)
maxLevel = ((Fixnum)printLevel).value;
else
maxLevel = Integer.MAX_VALUE;
LispObject currentPrintLevel =
_CURRENT_PRINT_LEVEL_.symbolValue(thread);
int currentLevel = ((Fixnum)currentPrintLevel).value;
if (currentLevel >= maxLevel)
return "#";
return unreadableString(typeOf().princToString());
}
}