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POHandling line replacements in headless mode
 

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  1. POHandling line replacements in headless mode
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    <p>I need something which will handle logging in commandline and headless mode as with a JFrame. </p> <p>I have a library which uses a static reference to a <code>StyledDocument</code>. I want to make it headless. The problem is I need to make a way to universally handle Carriage Returns. I am up to hear any solutions. </p> <p>Here's my current code</p> <pre><code>if (data.contains("\b")) { Statics.ProgressDoc.remove(lastNewLine, Statics.ProgressDoc.getLength() - lastNewLine); } </code></pre> <p>What I would like to do is convert it to just use a <code>String</code> and have the <code>JTextArea</code>'s content match whatever is in the string at all times.</p> <p>In JavaFX UI objects, this can be accomplished with an <code>Observable</code> object. Is there such an object in Swing for Text Areas?</p>
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    1. USAdamOutler
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    1. COQuestion 1: What do you mean by "logging"? Logging is already headless when done by the java.util.logging package. Question 2: Why are you using a StyledDocument? Are your log messages not plain text? Are you aware that a JTextArea uses a PlainDocument and does not show any styles? Question 3: You mention carriage returns, but your code is checking for `"\b"`, which is a backspace character. Is this intentional? Question 4: What does "universally handle Carriage Returns" mean? Question 5: When you say "convert it to just use a String" what does "it" refer to?
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    2. COOk, so basically, i'm trying to reform my current UI API, which sucks balls. My logging class routes information to various parts of the application including the UI. What I need is a way to attach an event listener to a string or some sort of object that will plug in to a JTextArea as easily as as a Commandline UI, or a JFXML UI, or even a Headless UI. I need a way to have the UI monitor some string data.
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    3. COA String is immutable, so String will never permit adding a listener to it (since its state never changes). It sounds like you need an `addLogEventListener` method in your logging code, or possibly even an [addHandler](http://docs.oracle.com/javase/7/docs/api/java/util/logging/Logger.html#addHandler%28java.util.logging.Handler%29) method. The actual handler/listener should call JTextArea.append from within a Runnable passed to `EventQueue.invokeLater`. A non-Swing handler/listener might just call BufferedWriter.write.
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