public Either<B, A> swap() {
A vLeft = null;
B vRight = null;
if (left.isDefined()) {
vLeft = left.get();
}
if (right.isDefined()) {
vRight = right.get();
}
return new Either<B, A>(vRight, vLeft);
}
public <X> Either<A, B> fold(Action<A> fa, Action<B> fb) {
if (isLeft()) {
fa.apply(left.get());
return new Either<A, B>(left.get(), null);
} else if (isRight()) {
fb.apply(right.get());
return new Either<A, B>(null, right.get());
} else {
return new Either<A, B>(null, null);
}
}
@Test
public void testLeft() {
Left left = new Left(null, expr("0123456789", 4));
assertEquals("0123", left.eval(null));
left = new Left(null, expr("0123456789", 11));
assertEquals("0123456789", left.eval(null));
left = new Left(null, expr("0123456789", 0));
assertEquals("", left.eval(null));
left = new Left(null, expr(1234, 2));
assertEquals("12", left.eval(null));
}
@Test
public void toString_A$() throws Exception {
Either<String, Integer> target = Left.apply("foo");
String actual = target.toString();
String expected = "Left(foo)";
assertThat(actual, is(equalTo(expected)));
}
@Test
public void right_A$() throws Exception {
Either<String, Integer> target = Left.apply("foo");
Option<Integer> actual = target.right();
assertThat(actual.isDefined(), is(false));
assertThat(actual.getOrNull(), is(nullValue()));
}
@Test
public void left_A$() throws Exception {
Either<String, Integer> target = Left.apply("foo");
Option<String> actual = target.left();
assertThat(actual.isDefined(), is(true));
assertThat(actual.getOrNull(), is(equalTo("foo")));
}
@Test
public void isRight_A$() throws Exception {
Either<String, Integer> target = Left.apply("foo");
boolean actual = target.isRight();
boolean expected = false;
assertThat(actual, is(equalTo(expected)));
}
@Test
public void swap_A$() throws Exception {
Either<String, Integer> target = Left.apply("foo");
Either<Integer, String> swapped = target.swap();
Option<String> right = swapped.right();
assertThat(right.isDefined(), is(true));
assertThat(right.getOrNull(), is(equalTo("foo")));
}
public <X> Option<X> fold(Function<A, X> fa, Function<B, X> fb) {
if (isLeft()) {
return Option.maybe(fa.apply(left.get()));
} else if (isRight()) {
return Option.maybe(fb.apply(right.get()));
} else {
return (Option<X>) Option.none();
}
}
@Test
public void mergeToLeft_A$Function1() throws Exception {
String value = "xxx";
Either<String, Integer> target = Left.apply(value);
Function1<Integer, String> rightToLeft =
new F1<Integer, String>() {
public String apply(Integer v) {
return v.toString();
}
};
String actual = target.mergeToLeft(rightToLeft);
String expected = "xxx";
assertThat(actual, is(equalTo(expected)));
}
@Test
public void mergeToRight_A$Function1() throws Exception {
String value = "xxx";
Either<String, Integer> target = Left.apply(value);
Function1<String, Integer> leftToRight =
new F1<String, Integer>() {
public Integer apply(String v) throws Exception {
return v.length();
}
};
Integer actual = target.mergeToRight(leftToRight);
Integer expected = 3;
assertThat(actual, is(equalTo(expected)));
}
/**
* This method is called from within the constructor to initialize the form. WARNING: Do NOT
* modify this code. The content of this method is always regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
picturePaint1 = new PicturePaint();
Advance = new javax.swing.JButton();
Right = new javax.swing.JButton();
Left = new javax.swing.JButton();
BackGround = new javax.swing.JPanel();
locationName = new javax.swing.JLabel();
Direction = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout
.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 462, Short.MAX_VALUE));
jPanel1Layout.setVerticalGroup(
jPanel1Layout
.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 0, Short.MAX_VALUE));
Advance.setText("Forward");
Advance.addActionListener(
new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
AdvanceActionPerformed(evt);
}
});
picturePaint1.add(Advance);
Advance.setBounds(290, 500, 90, 50);
Right.setText("Right");
Right.addActionListener(
new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
RightActionPerformed(evt);
}
});
picturePaint1.add(Right);
Right.setBounds(570, 500, 90, 50);
Left.setText("Left");
Left.addActionListener(
new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
LeftActionPerformed(evt);
}
});
picturePaint1.add(Left);
Left.setBounds(0, 500, 80, 50);
locationName.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
locationName.setForeground(new java.awt.Color(255, 255, 255));
locationName.setText("jLabel1");
Direction.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
Direction.setForeground(new java.awt.Color(255, 255, 255));
Direction.setText("jLabel1");
javax.swing.GroupLayout BackGroundLayout = new javax.swing.GroupLayout(BackGround);
BackGround.setLayout(BackGroundLayout);
BackGroundLayout.setHorizontalGroup(
BackGroundLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(
BackGroundLayout.createSequentialGroup()
.addContainerGap(20, Short.MAX_VALUE)
.addGroup(
BackGroundLayout.createParallelGroup(
javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(
javax.swing.GroupLayout.Alignment.TRAILING,
BackGroundLayout.createSequentialGroup()
.addComponent(
locationName,
javax.swing.GroupLayout.PREFERRED_SIZE,
160,
javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap())
.addGroup(
javax.swing.GroupLayout.Alignment.TRAILING,
BackGroundLayout.createSequentialGroup()
.addComponent(Direction)
.addGap(28, 28, 28)))));
BackGroundLayout.setVerticalGroup(
BackGroundLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(
BackGroundLayout.createSequentialGroup()
.addComponent(
locationName,
javax.swing.GroupLayout.PREFERRED_SIZE,
33,
javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(Direction)
.addGap(0, 19, Short.MAX_VALUE)));
picturePaint1.add(BackGround);
BackGround.setBounds(240, 10, 190, 80);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout
.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(
layout
.createSequentialGroup()
.addContainerGap()
.addComponent(
jPanel1,
javax.swing.GroupLayout.PREFERRED_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE,
javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(189, Short.MAX_VALUE))
.addComponent(
picturePaint1,
javax.swing.GroupLayout.DEFAULT_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE,
Short.MAX_VALUE));
layout.setVerticalGroup(
layout
.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(
javax.swing.GroupLayout.Alignment.TRAILING,
layout
.createSequentialGroup()
.addComponent(
picturePaint1,
javax.swing.GroupLayout.PREFERRED_SIZE,
556,
javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(
javax.swing.LayoutStyle.ComponentPlacement.RELATED,
javax.swing.GroupLayout.DEFAULT_SIZE,
Short.MAX_VALUE)
.addComponent(
jPanel1,
javax.swing.GroupLayout.PREFERRED_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE,
javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap()));
pack();
} // </editor-fold>//GEN-END:initComponents
@Test
public void __A$Option() throws Exception {
Either<String, Integer> target = Left.apply(Option.apply("foo"));
assertThat(target, notNullValue());
}
public boolean isLeft() {
return left.isDefined();
}
