Package jcckit.data

Class DataContainer

  • Direct Known Subclasses:
    DataCurve, DataPlot
    public abstract class DataContainer
extends Object
    Abstract superclass of all data containers. A data container holds an ordered list of DataElements of the same type.

    Data elements can be added, inserted, removed, or replaced. Such an action leads to a DataEvent which will be delivered to all DataListeners observing this DataContainer. If this data container also implements DataEvent (as DataCurve does) also the listeners registrated at the data container containg this container will be notified. As a consequence a DataListener must only be registered at the DataPlot instance and it will automatically also received events caused by manipulating one of its DataCurves.

    Concrete subclasses have to implement isValid(jcckit.data.DataElement) which checks whether the added or inserted DataElement is of the right type. This is an application of the Template Method Design Pattern.

    Author:
    Franz-Josef Elmer

    • Constructor Detail

      • DataContainer

        public DataContainer()

    • Method Detail

      • addDataListener

        public void addDataListener​(DataListener listener)
        Adds a DataListener. Does nothing if already added.

      • removeDataListener

        public void removeDataListener​(DataListener listener)
        Removes a DataListener. Does nothing if already removed.

      • getNumberOfElements

        public int getNumberOfElements()
        Returns the number of elements of this container.

      • getElement

        public DataElement getElement​(int index)
        Returns the element for the specified index.

      • getIndexOf

        public int getIndexOf​(DataElement element)
        Returns the index of the specified element.
        Parameters:
        element - Element to be looked for.
        Returns:
        -1 if not found.

      • insertElementAt

        public void insertElementAt​(int index,
                            DataElement element)
        Inserts a DataElement at the specified index. After the element has been successfully inserted all DataListeners will be informed.
        Parameters:
        index - Index at which element will be inserted. All elements with an index >= index will be shifted.
        element - DataElement to be added.
        Throws:
        IllegalArgumentException - if element is not of the correct type which will be checked by the method isValid(jcckit.data.DataElement).

      • removeElementAt

        public void removeElementAt​(int index)
        Removes a DataElement at the specified index. After the element has been successfully removed all DataListeners will be informed.
        Parameters:
        index - Index of the element which will be removed. All elements with an index > index will be shifted.

      • replaceElementAt

        public void replaceElementAt​(int index,
                             DataElement element)
        Replaces the DataElement at the specified index. After the element has been successfully replaced all DataListeners will be informed.
        Parameters:
        index - Index of the element which will be replaced by element.
        element - The new DataElement.
        Throws:
        IllegalArgumentException - if element is not of the correct type which will be checked by the method isValid(jcckit.data.DataElement).

      • isValid

        protected abstract boolean isValid​(DataElement element)
        Returns true if the specified DataElement has the correct type. Concrete subclasses have to implement this method.
        Parameters:
        element - DataElement to be checked.