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    Copyright (c) 1998, 1999, 2000, 2001, 2003, 2004 Benhur Stein
    This file is part of PajÚ.

    PajÚ is free software; you can redistribute it and/or modify it under
    the terms of the GNU Lesser General Public License as published by the
    Free Software Foundation; either version 2 of the License, or (at your
    option) any later version.

    PajÚ 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 Lesser General Public License
    for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with PajÚ; if not, write to the Free Software Foundation, Inc.,
    59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
#ifndef _Protocols_h_
#define _Protocols_h_

/* Protocols.h
 * Defines the protocols used in the Paje environment. 
 * 19970421 BS    creation

#include "FoundationAdditions.h"

@class NSColor, NSNumber, NSArray, NSDate, PajeEntityType, PajeContainer;

// drawing types of entities
typedef enum {
    PajeEventDrawingType,    // when there is only one time and one container
    PajeStateDrawingType,    // when there are two times and one container
    PajeLinkDrawingType,     // when there are two times and two containers
    PajeVariableDrawingType, // when there is a value associated between 2 times 1 ctr
} PajeDrawingType;

@protocol PajeInspecting
- (void)inspect;

@protocol PajeTiming
// the time an entity starts, ends
- (NSDate *)startTime;
- (NSDate *)endTime;
// the only time of an entity (an event), or it's startTime
- (NSDate *)time;
// like startTime and endTime, but firstTime is always before lastTime
// (for cases in which clocks are not synchronized and a message arrives 
// before beeing sent).
- (NSDate *)firstTime;
- (NSDate *)lastTime;

@protocol PajeEntity <PajeTiming, PajeInspecting, NSCoding>
- (NSString *)name;
- (PajeEntityType *)entityType;
- (NSArray *)relatedEntities;
- (NSColor *)color;
//- (id)node;
- (void)setColor:(NSColor *)color;

- (PajeDrawingType)drawingType;
//- (id)hierarchy;
- (PajeContainer *)container;
- (int)imbricationLevel;

@protocol PajeEntityType
- (NSArray *)allNames;
- (NSColor *)colorForName:(NSString *)name;
- (void)setColor:(NSColor*)c forName:(NSString *)name;

@protocol PajeEvent <PajeEntity>
//- (id)thread;

@protocol PajeState <PajeEvent>

@protocol PajeComm <PajeState>
//- (id)sourceNode;
//- (id)destNode;
//- (id)sourceThread;
//- (id)destThread;

@protocol PajeVariable <PajeEntity>
- (id)value;

@protocol PajeLink <PajeComm>
- (PajeEntityType *)sourceEntityType;
- (PajeEntityType *)destEntityType;
- (PajeContainer *)sourceContainer;
- (PajeContainer *)destContainer;

@protocol PajeComponent <NSObject>
- (void)setOutputComponent:(id<PajeComponent>)comp;
- (void)encodeCheckPointWithCoder:(NSCoder *)coder;
- (void)decodeCheckPointWithCoder:(NSCoder *)coder;

@protocol PajeReader <PajeComponent>
- (BOOL)readNextEvent;
- (NSDictionary *)setInputFilename:(NSString *)filename;
- (NSString *)inputFilename;
- (NSDate *)currentTime;
- (id <PajeEvent>)readEvent;
   - (void)readEvent;
   - (void)readNextEvent;
   - (void)readUntilTime:(NSDate *)t
   - (void)decodeCheckPointWithCoder:(NSCoder *)c
   - (void)encodeCheckPointWithCoder:(NSCoder *)c
   - (void)setInputFileName:(NSString *)filename

   - (void)removeObjectsBeforeTime:(NSDate *)t


@protocol PajeInspector
+ (id <PajeInspector>)inspector;
- (void)inspect:(id)sender;


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