RelaxedDocumentListener.java

package gui.events;

import gui.interfaces.GenericClosure;
import op.OPDE;
import org.apache.log4j.Logger;

import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import java.util.Timer;
import java.util.TimerTask;

/**
 * Created by tloehr on 02.06.15.
 */
public class RelaxedDocumentListener implements DocumentListener {
    private final long reactionDelayInMillis;
    private final GenericClosure<DocumentEvent> handleAction, afterAction;
    private Timer timer;


    public RelaxedDocumentListener(long reactionDelayInMillis, GenericClosure<DocumentEvent> handleAction) {
        this.handleAction = handleAction;
        this.reactionDelayInMillis = reactionDelayInMillis;
        this.afterAction = null;
    }

    public RelaxedDocumentListener(long reactionDelayInMillis, GenericClosure<DocumentEvent> handleAction, GenericClosure<DocumentEvent> afterAction) {
        this.handleAction = handleAction;
        this.reactionDelayInMillis = reactionDelayInMillis;
        this.afterAction = afterAction;
    }

    public RelaxedDocumentListener(GenericClosure<DocumentEvent> handleAction) {
        this(OPDE.DEFAULT_DOCUMENT_LISTENER_REACTION_TIME_IN_MILLIS, handleAction);
    }

    public RelaxedDocumentListener(GenericClosure<DocumentEvent> handleAction, GenericClosure<DocumentEvent> afterAction) {
        this(OPDE.DEFAULT_DOCUMENT_LISTENER_REACTION_TIME_IN_MILLIS, handleAction, afterAction);
    }

    public void changedUpdate(DocumentEvent e) {
        check(e);
    }

    public void removeUpdate(DocumentEvent e) {
        check(e);
    }

    public void insertUpdate(DocumentEvent e) {
        check(e);
    }

    public void cleanup() {
        if (timer != null) {
            timer.cancel();
            timer = null;
        }
    }


    public void check(DocumentEvent e) {
        cleanup();

        if (reactionDelayInMillis == 0) {
            try {
                handleAction.execute(e);
            } catch (Exception e1) {
                OPDE.fatal(Logger.getLogger(getClass()), e1);
            }
        } else {
            timer = new Timer();
            timer.schedule(new TimerTask() {
                @Override
                public void run() {
                    try {
                        handleAction.execute(e);
                    } catch (Exception e1) {
                        OPDE.fatal(Logger.getLogger(getClass()), e1);
                    }
                }

                @Override
                public boolean cancel() {
                    return super.cancel();
                }
            }, reactionDelayInMillis);
        }
    }

}