ComponentView.java

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package com.arcle.rmt.j2se.swing.ui;

import javax.swing.*;
import java.io.StringWriter;
import java.io.PrintWriter;
import java.util.Observable;
import com.arcle.rmt.j2se.framework.Document;

public class ComponentView extends JComponent implements View {
    public ComponentView() {
    }

    //-----------------------------------------------------------------------
    // Utility methods

    protected boolean addObservable(Object obj) {
        if (obj instanceof Observable) {
            Observable o = (Observable) obj;
            o.addObserver(this);
            return true;
        }
        return false;
    }

    protected boolean deleteObservable(Object obj) {
        if (obj instanceof Observable) {
            Observable o = (Observable) obj;
            o.deleteObserver(this);
            return true;
        }
        return false;
    }

    protected void showException(Exception e) {
        MoreSwingUtilities.showException(this, e);
    }

    //-----------------------------------------------------------------------
    // JComponent implementations

    public void addNotify() {
        super.addNotify();
        if (!initialized) {
            initChildren();
            layoutChildren();
            initialized = true;
        }
    }

    //-----------------------------------------------------------------------
    // Accessor Methods

    protected void setDead(boolean d) {
        dead = d;
    }

    protected boolean isDead() {
        return dead;
    }

    //-----------------------------------------------------------------------
    // View implementations

    public JComponent getComponent() {
        return this;
    }

    public void update(Observable o, Object param) {
        if (isDead()) {
            deleteObservable(o);
        }
    }

    public void setDocument(Document doc) {
        // check trivial case
        if (_document == doc) {
            return; // re-assignment, do nothing
        }
        Document old = _document;
        deleteObservable(_document);
        _document = doc;
        addObservable(_document);
        firePropertyChange("document", old, doc);
    }

    public Document getDocument() {
        return _document;
    }

    public Controller getController() {
        return null;
    }

    //-----------------------------------------------------------------------
    // Strategy Methods

    protected void initChildren() {  }

    protected void layoutChildren() {   }

    //-----------------------------------------------------------------------
    // Factory Methods


    //-----------------------------------------------------------------------
    // Member variables.

    private Document _document;

    private boolean initialized = false;

    private boolean dead = false;
}

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