BreakpointLineUpdater.java

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package org.netbeans.modules.ruby.debugger.breakpoints;

import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.IOException;
import org.openide.cookies.LineCookie;
import org.openide.loaders.DataObject;
import org.openide.text.Line;
import org.openide.util.Exceptions;

/** Simplified, heavily based on Java Debugger code. */
final class BreakpointLineUpdater implements PropertyChangeListener {

    private final RubyLineBreakpoint breakpoint;
    private DataObject dataObject;
    private Line line;

    public BreakpointLineUpdater(RubyLineBreakpoint breakpoint) {
        this.breakpoint = breakpoint;
        try {
            this.dataObject = DataObject.find(breakpoint.getFileObject());
        } catch (IOException ex) {
            Exceptions.printStackTrace(ex);
        }
    }

    public synchronized void attach() throws IOException {
        breakpoint.addPropertyChangeListener(this);
        try {
            LineCookie lc = dataObject.getCookie(LineCookie.class);
            this.line = lc.getLineSet().getCurrent(breakpoint.getLineNumber() - 1);
            line.addPropertyChangeListener(this);
        } catch (IndexOutOfBoundsException ioobex) {
            // ignore document changes for BP with bad line number
        }
    }

    public synchronized void detach() {
        breakpoint.removePropertyChangeListener(this);
        if (line != null) {
            line.removePropertyChangeListener(this);
        }
    }

    public synchronized void propertyChange(PropertyChangeEvent evt) {
        if (Line.PROP_LINE_NUMBER.equals(evt.getPropertyName()) && line == evt.getSource()) {
            breakpoint.notifyUpdated();
            return;
        }
    }
}