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org.apfloat.samples.PiAWT Maven / Gradle / Ivy
package org.apfloat.samples;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.Insets;
import java.awt.Container;
import java.awt.Panel;
import java.awt.Label;
import java.awt.Choice;
import java.awt.Checkbox;
import java.awt.CheckboxGroup;
import java.awt.TextField;
import java.awt.TextArea;
import java.awt.Button;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.util.List;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.Collections;
import java.io.StringWriter;
import java.io.PrintWriter;
import javax.imageio.spi.ServiceRegistry; // Silly that this is under javax.imageio
import org.apfloat.Apfloat;
import org.apfloat.ApfloatContext;
import org.apfloat.ApfloatRuntimeException;
import org.apfloat.spi.BuilderFactory;
/**
* Graphical AWT elements for calculating pi using four different algorithms.
*
* @version 1.8.0
* @author Mikko Tommila
*/
public class PiAWT
extends Panel
{
/**
* Interface to indicate an error status in the application.
*/
public static interface StatusIndicator
{
/**
* Show the specified error status.
*
* @param status The status.
*/
public void showStatus(String status);
}
/**
* Construct a panel with graphical elements.
*
* @param statusIndicator Handler for showing error messages in the application.
*/
public PiAWT(StatusIndicator statusIndicator)
{
this.statusIndicator = statusIndicator;
initGUI();
}
// Initialize the container and add the graphical elements to it
private void initGUI()
{
ApfloatContext ctx = ApfloatContext.getContext();
setLayout(new GridBagLayout());
GridBagConstraints constraints = new GridBagConstraints();
constraints.anchor = GridBagConstraints.NORTHWEST;
constraints.insets = new Insets(5, 5, 5, 5);
constraints.weightx = 1;
constraints.weighty = 1;
this.precisionLabel = new Label("Precision:");
add(this.precisionLabel, constraints);
this.precisionField = new TextField("1000000", 12);
add(this.precisionField, constraints);
this.radixLabel = new Label("Radix:");
add(this.radixLabel, constraints);
this.radixChoice = new Choice();
for (int i = Character.MIN_RADIX; i <= Character.MAX_RADIX; i++)
{
this.radixChoice.add(String.valueOf(i));
}
this.radixChoice.select(ctx.getProperty(ApfloatContext.DEFAULT_RADIX));
constraints.gridwidth = GridBagConstraints.REMAINDER;
add(this.radixChoice, constraints);
this.methodLabel = new Label("Method:");
constraints.gridwidth = 1;
constraints.gridheight = 3;
add(this.methodLabel, constraints);
Panel panel = new Panel(new GridBagLayout());
GridBagConstraints panelConstraints = new GridBagConstraints();
panelConstraints.gridwidth = GridBagConstraints.REMAINDER;
panelConstraints.anchor = GridBagConstraints.NORTHWEST;
panelConstraints.weightx = 1;
panelConstraints.weighty = 1;
this.methods = new CheckboxGroup();
this.chudnovsky = new Checkbox("Chudnovsky", true, this.methods);
panel.add(this.chudnovsky, panelConstraints);
this.ramanujan = new Checkbox("Ramanujan", false, this.methods);
panel.add(this.ramanujan, panelConstraints);
this.gaussLegendre = new Checkbox("Gauss-Legendre", false, this.methods);
panel.add(this.gaussLegendre, panelConstraints);
this.borwein = new Checkbox("Borwein", false, this.methods);
panel.add(this.borwein, panelConstraints);
add(panel, constraints);
this.implementationLabel = new Label("Implementation:");
constraints.gridwidth = 1;
constraints.gridheight = 1;
add(this.implementationLabel, constraints);
this.implementationChoice = new Choice();
this.builderFactories = new ArrayList();
String defaultBuilderFactoryClassName = ApfloatContext.getContext().getBuilderFactory().getClass().getName();
Iterator providers = ServiceRegistry.lookupProviders(org.apfloat.spi.BuilderFactory.class);
if (!providers.hasNext())
{
BuilderFactory builderFactory = ApfloatContext.getContext().getBuilderFactory();
providers = Collections.singleton(builderFactory).iterator();
}
for (int i = 0; providers.hasNext(); i++)
{
BuilderFactory builderFactory = providers.next();
String builderFactoryClassName = builderFactory.getClass().getName();
this.builderFactories.add(builderFactory);
this.implementationChoice.add(builderFactoryClassName);
if (builderFactoryClassName.equals(defaultBuilderFactoryClassName))
{
this.implementationChoice.select(i);
}
}
constraints.gridwidth = GridBagConstraints.REMAINDER;
add(this.implementationChoice, constraints);
constraints.gridwidth = 1;
initThreads(this, constraints);
this.goButton = new Button("Go!");
constraints.gridwidth = 1;
add(this.goButton, constraints);
this.abortButton = new Button("Abort!");
this.abortButton.setEnabled(false);
constraints.gridwidth = GridBagConstraints.REMAINDER;
add(this.abortButton, constraints);
this.statusLabel = new Label("Status:");
add(this.statusLabel, constraints);
this.statusArea = new TextArea(null, 5, 60, TextArea.SCROLLBARS_VERTICAL_ONLY);
this.statusArea.setEditable(false);
constraints.fill = GridBagConstraints.HORIZONTAL;
add(this.statusArea, constraints);
this.resultLabel = new Label("Result:");
constraints.fill = GridBagConstraints.NONE;
add(this.resultLabel, constraints);
this.resultArea = new TextArea(null, 5, 60, TextArea.SCROLLBARS_VERTICAL_ONLY);
this.resultArea.setEditable(false);
constraints.fill = GridBagConstraints.HORIZONTAL;
add(this.resultArea, constraints);
this.goButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent actionEvent)
{
if (isInputValid())
{
PiAWT.this.statusArea.getText(); // FIXME: workaround for Java bug 9008097, to be removed
PiAWT.this.resultArea.getText(); // FIXME: workaround for Java bug 9008097, to be removed
PiAWT.this.statusArea.setText(null);
PiAWT.this.resultArea.setText(null);
PiAWT.this.goButton.setEnabled(false);
startThread();
}
}
});
this.abortButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent actionEvent)
{
PiAWT.this.abortButton.setEnabled(false);
stopThread();
}
});
}
/**
* Initialize the "threads" section GUI elements.
* Elements should be added for the remainder of the width of the container.
*
* @param container The container where the elements are to be added.
* @param constraints The constraints with which the elements are to be added to the container.
*/
protected void initThreads(Container container, GridBagConstraints constraints)
{
constraints.gridwidth = GridBagConstraints.REMAINDER;
container.add(new Label(), constraints);
}
/**
* Validates the input fields.
*
* @return true if all input fields contain valid values, otherwise false.
*/
protected boolean isInputValid()
{
String precisionString = this.precisionField.getText();
try
{
long precision = Long.parseLong(precisionString);
if (precision <= 0)
{
throw new NumberFormatException();
}
showStatus(null);
return true;
}
catch (NumberFormatException nfe)
{
showStatus("Invalid precision: " + precisionString);
this.precisionField.requestFocus();
return false;
}
}
/**
* Show the specified error status.
*
* @param status The status.
*/
protected void showStatus(String status)
{
this.statusIndicator.showStatus(status);
}
// Prints output to a text area
private static class FlushStringWriter
extends StringWriter
{
public FlushStringWriter(TextArea dst)
{
this.dst = dst;
this.length = 0;
this.position = 0;
this.lastLinefeedPosition = 0;
}
public void flush()
{
super.flush();
StringBuffer buffer = getBuffer();
String text = buffer.toString();
String lineSeparator = System.getProperty("line.separator");
boolean endsWithLineSeparator = text.endsWith(lineSeparator),
endsWithCarriageReturn = text.endsWith("\r");
if (endsWithLineSeparator)
{
// Convert trailing line separator to \n to increase compatibility between platforms
text = text.substring(0, text.length() - lineSeparator.length()) + '\n';
}
else if (endsWithCarriageReturn)
{
// Strip trailing carriage return
text = text.substring(0, text.length() - 1);
}
this.dst.replaceRange(text, this.position, this.length);
this.position += text.length();
this.length = this.position;
if (endsWithLineSeparator)
{
this.lastLinefeedPosition = this.position;
}
else if (endsWithCarriageReturn)
{
this.position = this.lastLinefeedPosition;
}
buffer.setLength(0);
}
private TextArea dst;
private int length,
position,
lastLinefeedPosition;
}
/**
* Get the calculation operation to execute.
*
* @param precision The precision to be used.
* @param radix The radix to be used.
*
* @return The calculation operation to execute.
*/
protected Operation getOperation(long precision, int radix)
throws ApfloatRuntimeException
{
if (this.chudnovsky.getState())
{
return new Pi.ChudnovskyPiCalculator(precision, radix);
}
else if (this.ramanujan.getState())
{
return new Pi.RamanujanPiCalculator(precision, radix);
}
else if (this.gaussLegendre.getState())
{
return new Pi.GaussLegendrePiCalculator(precision, radix);
}
else
{
return new Pi.BorweinPiCalculator(precision, radix);
}
}
private void startThread()
{
// Writer for writing standard output to the result area
Pi.setOut(new PrintWriter(new FlushStringWriter(this.resultArea), true));
// Writer for writing standard error output to the status area
Pi.setErr(new PrintWriter(new FlushStringWriter(this.statusArea), true));
// Set the selected builder factory
ApfloatContext ctx = ApfloatContext.getContext();
BuilderFactory builderFactory = this.builderFactories.get(this.implementationChoice.getSelectedIndex());
ctx.setBuilderFactory(builderFactory);
// Thread for calculating pi and showing the result
this.calculatorThread = new Thread()
{
public void run()
{
long precision = Long.parseLong(PiAWT.this.precisionField.getText());
int radix = Integer.parseInt(PiAWT.this.radixChoice.getSelectedItem());
Operation operation = getOperation(precision, radix);
try
{
Pi.run(precision, radix, operation);
}
catch (ThreadDeath td)
{
aborted();
}
catch (AssertionError ae)
{
crashed(ae);
}
catch (Exception e)
{
crashed(e);
}
finally
{
end();
}
}
};
Pi.setAlive(true);
this.calculatorThread.start();
this.abortButton.setEnabled(true);
}
private void stopThread()
{
Pi.setAlive(false);
}
private void aborted()
{
Pi.getErr().println("Aborted");
}
private void crashed(Throwable cause)
{
Pi.getErr().println("Crashed with " + cause);
cause.printStackTrace();
}
private void end()
{
this.abortButton.setEnabled(false);
this.goButton.setEnabled(true);
ApfloatContext ctx = ApfloatContext.getContext();
BuilderFactory builderFactory = ctx.getBuilderFactory();
builderFactory.gc(); // Garbage collection may not have run perfectly by this point
}
private StatusIndicator statusIndicator;
private Label precisionLabel;
private TextField precisionField;
private Label radixLabel;
private Choice radixChoice;
private Label methodLabel;
private CheckboxGroup methods;
private Checkbox chudnovsky;
private Checkbox ramanujan;
private Checkbox gaussLegendre;
private Checkbox borwein;
private Label implementationLabel;
private Choice implementationChoice;
private Button goButton;
private Button abortButton;
private Label statusLabel;
private TextArea statusArea;
private Label resultLabel;
private TextArea resultArea;
private List builderFactories;
private Thread calculatorThread;
}
