eric6/Graphics/UMLDiagramBuilder.py

# -*- coding: utf-8 -*-

# Copyright (c) 2012 - 2021 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing the UML diagram builder base class.
"""

from PyQt5.QtCore import QObject


class UMLDiagramBuilder(QObject):
    """
    Class implementing the UML diagram builder base class.
    """
    def __init__(self, dialog, view, project):
        """
        Constructor
        
        @param dialog reference to the UML dialog
        @type UMLDialog
        @param view reference to the view object
        @type UMLGraphicsView
        @param project reference to the project object
        @type Project
        """
        super().__init__(dialog)
        
        self.umlView = view
        self.scene = self.umlView.scene()
        self.project = project
    
    def initialize(self):
        """
        Public method to initialize the object.
        """
        return
    
    def buildErrorMessage(self, msg):
        """
        Public method to build an error string to be included in the scene.
        
        @param msg error message
        @type str
        @return prepared error string
        @rtype str
        """
        return (
            "<font color='{0}'>".format(
                self.umlView.getDrawingColors()[0].name()) +
            msg +
            "</font>"
        )
    
    def buildDiagram(self):
        """
        Public method to build the diagram.
        
        This class must be implemented in subclasses.
        
        @exception NotImplementedError raised to indicate that this class
            must be subclassed
        """
        raise NotImplementedError(
            "Method 'buildDiagram' must be implemented in subclasses.")
    
    def getPersistenceData(self):
        """
        Public method to get a string for data to be persisted.
        
        @return persisted data string
        @rtype str
        """
        return ""
    
    def parsePersistenceData(self, version, data):
        """
        Public method to parse persisted data.
        
        @param version version of the data
        @type str
        @param data persisted data to be parsed
        @type str
        @return flag indicating success
        @rtype bool
        """
        return True
    
    def toDict(self):
        """
        Public method to collect data to be persisted.
        
        @return dictionary containing data to be persisted
        @rtype dict
        """
        return {}
    
    def fromDict(self, version, data):
        """
        Public method to populate the class with data persisted by 'toDict()'.
        
        @param version version of the data
        @type str
        @param data dictionary containing the persisted data
        @type dict
        @return tuple containing a flag indicating success and an info
            message in case the diagram belongs to a different project
        @rtype tuple of (bool, str)
        """
        return True, ""