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package javax.swing;
import java.util.*;
import java.io.Serializable;
A simple implementation of SpinnerModel whose
values are defined by an array or a List.
For example to create a model defined by
an array of the names of the days of the week:
String[] days = new DateFormatSymbols().getWeekdays();
SpinnerModel model = new SpinnerListModel(Arrays.asList(days).subList(1, 8));
This class only stores a reference to the array or List
so if an element of the underlying sequence changes, it's up
to the application to notify the ChangeListeners by calling
fireStateChanged.
This model inherits a ChangeListener.
The ChangeListeners are notified whenever the
model's value or list properties changes.
Author: Hans Muller See Also: Since: 1.4
/**
* A simple implementation of <code>SpinnerModel</code> whose
* values are defined by an array or a <code>List</code>.
* For example to create a model defined by
* an array of the names of the days of the week:
* <pre>
* String[] days = new DateFormatSymbols().getWeekdays();
* SpinnerModel model = new SpinnerListModel(Arrays.asList(days).subList(1, 8));
* </pre>
* This class only stores a reference to the array or <code>List</code>
* so if an element of the underlying sequence changes, it's up
* to the application to notify the <code>ChangeListeners</code> by calling
* <code>fireStateChanged</code>.
* <p>
* This model inherits a <code>ChangeListener</code>.
* The <code>ChangeListener</code>s are notified whenever the
* model's <code>value</code> or <code>list</code> properties changes.
*
* @see JSpinner
* @see SpinnerModel
* @see AbstractSpinnerModel
* @see SpinnerNumberModel
* @see SpinnerDateModel
*
* @author Hans Muller
* @since 1.4
*/
@SuppressWarnings("serial") // Superclass is not serializable across versions
public class SpinnerListModel extends AbstractSpinnerModel implements Serializable
{
private List<?> list;
private int index;
Constructs a SpinnerModel whose sequence of
values is defined by the specified List.
The initial value (current element)
of the model will be values.get(0).
If values is null or has zero
size, an IllegalArugmentException is thrown.
Params: - values – the sequence this model represents
Throws: - IllegalArgumentException – if
values is
null or zero size
/**
* Constructs a <code>SpinnerModel</code> whose sequence of
* values is defined by the specified <code>List</code>.
* The initial value (<i>current element</i>)
* of the model will be <code>values.get(0)</code>.
* If <code>values</code> is <code>null</code> or has zero
* size, an <code>IllegalArugmentException</code> is thrown.
*
* @param values the sequence this model represents
* @throws IllegalArgumentException if <code>values</code> is
* <code>null</code> or zero size
*/
public SpinnerListModel(List<?> values) {
if (values == null || values.size() == 0) {
throw new IllegalArgumentException("SpinnerListModel(List) expects non-null non-empty List");
}
this.list = values;
this.index = 0;
}
Constructs a SpinnerModel whose sequence of values
is defined by the specified array. The initial value of the model
will be values[0]. If values is
null or has zero length, an
IllegalArgumentException is thrown.
Params: - values – the sequence this model represents
Throws: - IllegalArgumentException – if
values is
null or zero length
/**
* Constructs a <code>SpinnerModel</code> whose sequence of values
* is defined by the specified array. The initial value of the model
* will be <code>values[0]</code>. If <code>values</code> is
* <code>null</code> or has zero length, an
* <code>IllegalArgumentException</code> is thrown.
*
* @param values the sequence this model represents
* @throws IllegalArgumentException if <code>values</code> is
* <code>null</code> or zero length
*/
public SpinnerListModel(Object[] values) {
if (values == null || values.length == 0) {
throw new IllegalArgumentException("SpinnerListModel(Object[]) expects non-null non-empty Object[]");
}
this.list = Arrays.asList(values);
this.index = 0;
}
Constructs an effectively empty SpinnerListModel.
The model's list will contain a single
"empty" string element.
/**
* Constructs an effectively empty <code>SpinnerListModel</code>.
* The model's list will contain a single
* <code>"empty"</code> string element.
*/
public SpinnerListModel() {
this(new Object[]{"empty"});
}
Returns the List that defines the sequence for this model.
See Also: Returns: the value of the list property
/**
* Returns the <code>List</code> that defines the sequence for this model.
*
* @return the value of the <code>list</code> property
* @see #setList
*/
public List<?> getList() {
return list;
}
Changes the list that defines this sequence and resets the index
of the models value to zero. Note that list
is not copied, the model just stores a reference to it.
This method fires a ChangeEvent if list is
not equal to the current list.
Params: - list – the sequence that this model represents
Throws: - IllegalArgumentException – if
list is
null or zero length
See Also:
/**
* Changes the list that defines this sequence and resets the index
* of the models <code>value</code> to zero. Note that <code>list</code>
* is not copied, the model just stores a reference to it.
* <p>
* This method fires a <code>ChangeEvent</code> if <code>list</code> is
* not equal to the current list.
*
* @param list the sequence that this model represents
* @throws IllegalArgumentException if <code>list</code> is
* <code>null</code> or zero length
* @see #getList
*/
public void setList(List<?> list) {
if ((list == null) || (list.size() == 0)) {
throw new IllegalArgumentException("invalid list");
}
if (!list.equals(this.list)) {
this.list = list;
index = 0;
fireStateChanged();
}
}
Returns the current element of the sequence.
See Also: Returns: the value property
/**
* Returns the current element of the sequence.
*
* @return the <code>value</code> property
* @see SpinnerModel#getValue
* @see #setValue
*/
public Object getValue() {
return list.get(index);
}
Changes the current element of the sequence and notifies
ChangeListeners. If the specified
value is not equal to an element of the underlying sequence
then an IllegalArgumentException is thrown.
In the following example the setValue call
would cause an exception to be thrown:
String[] values = {"one", "two", "free", "four"};
SpinnerModel model = new SpinnerListModel(values);
model.setValue("TWO");
Params: - elt – the sequence element that will be model's current value
Throws: - IllegalArgumentException – if the specified value isn't allowed
See Also:
/**
* Changes the current element of the sequence and notifies
* <code>ChangeListeners</code>. If the specified
* value is not equal to an element of the underlying sequence
* then an <code>IllegalArgumentException</code> is thrown.
* In the following example the <code>setValue</code> call
* would cause an exception to be thrown:
* <pre>
* String[] values = {"one", "two", "free", "four"};
* SpinnerModel model = new SpinnerListModel(values);
* model.setValue("TWO");
* </pre>
*
* @param elt the sequence element that will be model's current value
* @throws IllegalArgumentException if the specified value isn't allowed
* @see SpinnerModel#setValue
* @see #getValue
*/
public void setValue(Object elt) {
int index = list.indexOf(elt);
if (index == -1) {
throw new IllegalArgumentException("invalid sequence element");
}
else if (index != this.index) {
this.index = index;
fireStateChanged();
}
}
Returns the next legal value of the underlying sequence or
null if value is already the last element.
See Also: Returns: the next legal value of the underlying sequence or
null if value is already the last element
/**
* Returns the next legal value of the underlying sequence or
* <code>null</code> if value is already the last element.
*
* @return the next legal value of the underlying sequence or
* <code>null</code> if value is already the last element
* @see SpinnerModel#getNextValue
* @see #getPreviousValue
*/
public Object getNextValue() {
return (index >= (list.size() - 1)) ? null : list.get(index + 1);
}
Returns the previous element of the underlying sequence or
null if value is already the first element.
See Also: Returns: the previous element of the underlying sequence or
null if value is already the first element
/**
* Returns the previous element of the underlying sequence or
* <code>null</code> if value is already the first element.
*
* @return the previous element of the underlying sequence or
* <code>null</code> if value is already the first element
* @see SpinnerModel#getPreviousValue
* @see #getNextValue
*/
public Object getPreviousValue() {
return (index <= 0) ? null : list.get(index - 1);
}
Returns the next object that starts with substring.
Params: - substring – the string to be matched
Returns: the match
/**
* Returns the next object that starts with <code>substring</code>.
*
* @param substring the string to be matched
* @return the match
*/
Object findNextMatch(String substring) {
int max = list.size();
if (max == 0) {
return null;
}
int counter = index;
do {
Object value = list.get(counter);
String string = value.toString();
if (string != null && string.startsWith(substring)) {
return value;
}
counter = (counter + 1) % max;
} while (counter != index);
return null;
}
}