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/*
* java-gnome, a UI library for writing GTK and GNOME programs from Java!
*
* Copyright © 2005-2010 Operational Dynamics Consulting, Pty Ltd
*
* The code in this file, and the program it is a part of, is made available
* to you by its authors as open source software: you can redistribute it
* and/or modify it under the terms of the GNU General Public License version
* 2 ("GPL") as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GPL for more details.
*
* You should have received a copy of the GPL along with this program. If not,
* see http://www.gnu.org/licenses/. The authors of this program may be
* contacted through http://java-gnome.sourceforge.net/.
*/
package com.operationaldynamics.ui;
/*
* This class imported from ObjectiveAccounts accounting package where it was
* originally deployed as GPL code in generic.ui.TextOutput
*/
import java.io.PrintStream;
import java.io.PrintWriter;
import org.freedesktop.bindings.Environment;
/**
* Base class for routines that output text to terminal. It takes care of
* working out and making available to subclasses an appropriate terminal
* width. Note that this can be set or overridden on the VM command line by
* setting the COLUMNS property:
*
* <pre>
* java -DCOLUMNS=70 ...
* </pre>
*
* @author Andrew Cowie
*/
public abstract class TextOutput extends Text
{
/**
* Terminal width, in character cells. Pulled from environment variable
* "COLUMNS" if it set, otherwise a default value is used.
*/
public static final int COLUMNS;
private static final int COLUMNS_DEFAULT = 80;
protected static final int COLUMNS_MIN = 50;
/**
* Specify left alignment for whatever you are outputting or padding.
* Points to Align.LEFT; is here for convenience and brevity in
* subclasses.
*/
protected static final Align LEFT = Align.LEFT;
/**
* Specify right alignment for whatever you are outputting or padding
* Actually just points at Align.RIGHT; is here for brevity in subclasses.
*/
protected static final Align RIGHT = Align.RIGHT;
static {
String env = Environment.getEnv("COLUMNS");
if (env == null) {
COLUMNS = COLUMNS_DEFAULT;
} else {
int val = Integer.valueOf(env).intValue();
if (val < COLUMNS_MIN) {
throw new IllegalStateException("Terminal too narrow for TextOutput. Min width "
+ COLUMNS_MIN + " characters.");
}
COLUMNS = val;
}
}
/**
* Wrapper around toOutput(PrintWriter) to which you can easily pass an
* old school PrintStream
*
* @param out
* a PrintStream like System.out or System.err
*/
public final void toOutput(PrintStream out) {
toOutput(new PrintWriter(out, true));
}
public abstract void toOutput(PrintWriter out);
}
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