Java™ Platform
Standard Ed. 6

javax.swing
Class RowFilter<M,I>

java.lang.Object
  extended by javax.swing.RowFilter<M,I>
Type Parameters:
M - the type of the model; for example PersonModel
I - the type of the identifier; when using TableRowSorter this will be Integer

public abstract class RowFilter<M,I>
extends Object

RowFilter is used to filter out entries from the model so that they are not shown in the view. For example, a RowFilter associated with a JTable might only allow rows that contain a column with a specific string. The meaning of entry depends on the component type. For example, when a filter is associated with a JTable, an entry corresponds to a row; when associated with a JTree, an entry corresponds to a node.

Subclasses must override the include method to indicate whether the entry should be shown in the view. The Entry argument can be used to obtain the values in each of the columns in that entry. The following example shows an include method that allows only entries containing one or more values starting with the string "a":

 RowFilter<Object,Object> startsWithAFilter = new RowFilter<Object,Object>() {
   public boolean include(Entry<? extends Object, ? extends Object> entry) {
     for (int i = entry.getValueCount() - 1; i >= 0; i--) {
       if (entry.getStringValue(i).startsWith("a")) {
         // The value starts with "a", include it
         return true;
       }
     }
     // None of the columns start with "a"; return false so that this
     // entry is not shown
     return false;
   }
 };
 
RowFilter has two formal type parameters that allow you to create a RowFilter for a specific model. For example, the following assumes a specific model that is wrapping objects of type Person. Only Persons with an age over 20 will be shown:
 RowFilter<PersonModel,Integer> ageFilter = new RowFilter<PersonModel,Integer>() {
   public boolean include(Entry<? extends PersonModel, ? extends Integer> entry) {
     PersonModel personModel = entry.getModel();
     Person person = personModel.getPerson(entry.getIdentifier());
     if (person.getAge() > 20) {
       // Returning true indicates this row should be shown.
       return true;
     }
     // Age is <= 20, don't show it.
     return false;
   }
 };
 PersonModel model = createPersonModel();
 TableRowSorter<PersonModel> sorter = new TableRowSorter<PersonModel>(model);
 sorter.setRowFilter(ageFilter);
 

Since:
1.6
See Also:
TableRowSorter

Nested Class Summary
static class RowFilter.ComparisonType
          Enumeration of the possible comparison values supported by some of the default RowFilters.
static class RowFilter.Entry<M,I>
          An Entry object is passed to instances of RowFilter, allowing the filter to get the value of the entry's data, and thus to determine whether the entry should be shown.
 
Constructor Summary
RowFilter()
           
 
Method Summary
static
<M,I> RowFilter<M,I>
andFilter(Iterable<? extends RowFilter<? super M,? super I>> filters)
          Returns a RowFilter that includes entries if all of the supplied filters include the entry.
static
<M,I> RowFilter<M,I>
dateFilter(RowFilter.ComparisonType type, Date date, int... indices)
          Returns a RowFilter that includes entries that have at least one Date value meeting the specified criteria.
abstract  boolean include(RowFilter.Entry<? extends M,? extends I> entry)
          Returns true if the specified entry should be shown; returns false if the entry should be hidden.
static
<M,I> RowFilter<M,I>
notFilter(RowFilter<M,I> filter)
          Returns a RowFilter that includes entries if the supplied filter does not include the entry.
static
<M,I> RowFilter<M,I>
numberFilter(RowFilter.ComparisonType type, Number number, int... indices)
          Returns a RowFilter that includes entries that have at least one Number value meeting the specified criteria.
static
<M,I> RowFilter<M,I>
orFilter(Iterable<? extends RowFilter<? super M,? super I>> filters)
          Returns a RowFilter that includes entries if any of the supplied filters includes the entry.
static
<M,I> RowFilter<M,I>
regexFilter(String regex, int... indices)
          Returns a RowFilter that uses a regular expression to determine which entries to include.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

RowFilter

public RowFilter()
Method Detail

regexFilter

public static <M,I> RowFilter<M,I> regexFilter(String regex,
                                               int... indices)
Returns a RowFilter that uses a regular expression to determine which entries to include. Only entries with at least one matching value are included. For example, the following creates a RowFilter that includes entries with at least one value starting with "a":
   RowFilter.regexFilter("^a");
 

The returned filter uses Matcher.find() to test for inclusion. To test for exact matches use the characters '^' and '$' to match the beginning and end of the string respectively. For example, "^foo$" includes only rows whose string is exactly "foo" and not, for example, "food". See Pattern for a complete description of the supported regular-expression constructs.

Parameters:
regex - the regular expression to filter on
indices - the indices of the values to check. If not supplied all values are evaluated
Returns:
a RowFilter implementing the specified criteria
Throws:
NullPointerException - if regex is null
IllegalArgumentException - if any of the indices are < 0
PatternSyntaxException - if regex is not a valid regular expression.
See Also:
Pattern

dateFilter

public static <M,I> RowFilter<M,I> dateFilter(RowFilter.ComparisonType type,
                                              Date date,
                                              int... indices)
Returns a RowFilter that includes entries that have at least one Date value meeting the specified criteria. For example, the following RowFilter includes only entries with at least one date value after the current date:
   RowFilter.dateFilter(ComparisonType.AFTER, new Date());
 

Parameters:
type - the type of comparison to perform
date - the date to compare against
indices - the indices of the values to check. If not supplied all values are evaluated
Returns:
a RowFilter implementing the specified criteria
Throws:
NullPointerException - if date is null
IllegalArgumentException - if any of the indices are < 0 or type is null
See Also:
Calendar, Date

numberFilter

public static <M,I> RowFilter<M,I> numberFilter(RowFilter.ComparisonType type,
                                                Number number,
                                                int... indices)
Returns a RowFilter that includes entries that have at least one Number value meeting the specified criteria. For example, the following filter will only include entries with at least one number value equal to 10:
   RowFilter.numberFilter(ComparisonType.EQUAL, 10);
 

Parameters:
type - the type of comparison to perform
indices - the indices of the values to check. If not supplied all values are evaluated
Returns:
a RowFilter implementing the specified criteria
Throws:
IllegalArgumentException - if any of the indices are < 0, type is null or number is null

orFilter

public static <M,I> RowFilter<M,I> orFilter(Iterable<? extends RowFilter<? super M,? super I>> filters)
Returns a RowFilter that includes entries if any of the supplied filters includes the entry.

The following example creates a RowFilter that will include any entries containing the string "foo" or the string "bar":

   List<RowFilter<Object,Object>> filters = new ArrayList<RowFilter<Object,Object>>(2);
   filters.add(RowFilter.regexFilter("foo"));
   filters.add(RowFilter.regexFilter("bar"));
   RowFilter<Object,Object> fooBarFilter = RowFilter.orFilter(filters);
 

Parameters:
filters - the RowFilters to test
Returns:
a RowFilter implementing the specified criteria
Throws:
IllegalArgumentException - if any of the filters are null
NullPointerException - if filters is null
See Also:
Arrays.asList(T...)

andFilter

public static <M,I> RowFilter<M,I> andFilter(Iterable<? extends RowFilter<? super M,? super I>> filters)
Returns a RowFilter that includes entries if all of the supplied filters include the entry.

The following example creates a RowFilter that will include any entries containing the string "foo" and the string "bar":

   List<RowFilter<Object,Object>> filters = new ArrayList<RowFilter<Object,Object>>(2);
   filters.add(RowFilter.regexFilter("foo"));
   filters.add(RowFilter.regexFilter("bar"));
   RowFilter<Object,Object> fooBarFilter = RowFilter.andFilter(filters);
 

Parameters:
filters - the RowFilters to test
Returns:
a RowFilter implementing the specified criteria
Throws:
IllegalArgumentException - if any of the filters are null
NullPointerException - if filters is null
See Also:
Arrays.asList(T...)

notFilter

public static <M,I> RowFilter<M,I> notFilter(RowFilter<M,I> filter)
Returns a RowFilter that includes entries if the supplied filter does not include the entry.

Parameters:
filter - the RowFilter to negate
Returns:
a RowFilter implementing the specified criteria
Throws:
IllegalArgumentException - if filter is null

include

public abstract boolean include(RowFilter.Entry<? extends M,? extends I> entry)
Returns true if the specified entry should be shown; returns false if the entry should be hidden.

The entry argument is valid only for the duration of the invocation. Using entry after the call returns results in undefined behavior.

Parameters:
entry - a non-null object that wraps the underlying object from the model
Returns:
true if the entry should be shown

Java™ Platform
Standard Ed. 6

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