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## com.sun.mirror.util
Class DeclarationFilter

    java.lang.Object
      com.sun.mirror.util.DeclarationFilter

    public class DeclarationFilter

extends Object

A filter for selecting just the items of interest from a collection of declarations. The filter is said to select or to match those declarations. Filters can be created in several ways: by the static methods described below, by negating or composing existing filters, or by subclasses that implement arbitrary matching rules.

A subclass can create an arbitrary filter simply by implementing the `matches(Declaration)` method.

Examples.

Selecting the `public` declarations from a collection:

>          result = FILTER_PUBLIC.filter(decls);

Selecting class declarations (including enums):

>          classFilter = DeclarationFilter.getFilter(ClassDeclaration.class);
>          result = classFilter.filter(decls);

Selecting class declarations but excluding enums:

>          enumFilter = DeclarationFilter.getFilter(EnumDeclaration.class);
>          compoundFilter = classFilter.and(enumFilter.not());
>          result = compoundFilter.filter(decls);

Selecting declarations named "Bob":

>          nameFilter = new DeclarationFilter() {
>                           public boolean matches(Declaration d) {
>                               return d.getSimpleName().equals("Bob");
>                           }
>                       };
>          result = nameFilter.filter(decls);

Since:
  1.5

Field Summary
`static DeclarationFilter` | `FILTER_PACKAGE` A filter that selects only package-private (default) declarations.
`static DeclarationFilter` | `FILTER_PRIVATE` A filter that selects only `private` declarations.
`static DeclarationFilter` | `FILTER_PROTECTED` A filter that selects only `protected` declarations.
`static DeclarationFilter` | `FILTER_PUBLIC` A filter that selects only `public` declarations.
`static DeclarationFilter` | `FILTER_PUBLIC_OR_PROTECTED` A filter that selects only `public` or `protected` declarations.

Constructor Summary
`DeclarationFilter()` Constructs an identity filter: one that selects all declarations.

Method Summary
`DeclarationFilter` | `and(DeclarationFilter f)` Returns a filter that selects those declarations selected by both this filter and another.
`
`<D extends Declaration> Collection<D>`
` | `filter(Collection<? extends Declaration> decls, Class<D> resType)` Returns the declarations matched by this filter, with the result being restricted to declarations of a given kind.
`
`<D extends Declaration> Collection<D>`
` | `filter(Collection<D> decls)` Returns the declarations matched by this filter.
`static DeclarationFilter` | `getFilter(Class<? extends Declaration> kind)` Returns a filter that selects declarations of a particular kind.
`static DeclarationFilter` | `getFilter(Collection<Modifier> mods)` Returns a filter that selects declarations containing all of a collection of modifiers.
`boolean` | `matches(Declaration decl)` Tests whether this filter matches a given declaration.
`DeclarationFilter` | `not()` Returns a filter that selects those declarations not selected by this filter.
`DeclarationFilter` | `or(DeclarationFilter f)` Returns a filter that selects those declarations selected by either this filter or another.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### FILTER_PUBLIC

    public static final DeclarationFilter FILTER_PUBLIC

  A filter that selects only `public` declarations.

### FILTER_PROTECTED

    public static final DeclarationFilter FILTER_PROTECTED

  A filter that selects only `protected` declarations.

### FILTER_PUBLIC_OR_PROTECTED

    public static final DeclarationFilter FILTER_PUBLIC_OR_PROTECTED

  A filter that selects only `public` or `protected` declarations.

### FILTER_PACKAGE

    public static final DeclarationFilter FILTER_PACKAGE

  A filter that selects only package-private (default) declarations.

### FILTER_PRIVATE

    public static final DeclarationFilter FILTER_PRIVATE

  A filter that selects only `private` declarations.

Constructor Detail

### DeclarationFilter

    public DeclarationFilter()

  Constructs an identity filter: one that selects all declarations.

Method Detail

### getFilter

    public static DeclarationFilter getFilter(Collection<Modifier> mods)

  Returns a filter that selects declarations containing all of a collection of modifiers.

  Parameters:
    `mods` - the modifiers to match (non-null)
  Returns:
    a filter that matches declarations containing `mods`

### getFilter

    public static DeclarationFilter getFilter(Class<? extends Declaration> kind)

  Returns a filter that selects declarations of a particular kind. For example, there may be a filter that selects only class declarations, or only fields. The filter will select declarations of the specified kind, and also any subtypes of that kind; for example, a field filter will also select enum constants.

  Parameters:
    `kind` - the kind of declarations to select
  Returns:
    a filter that selects declarations of a particular kind

### and

    public DeclarationFilter and(DeclarationFilter f)

  Returns a filter that selects those declarations selected by both this filter and another.

  Parameters:
    `f` - filter to be composed with this one
  Returns:
    a filter that selects those declarations selected by both this filter and another

### or

    public DeclarationFilter or(DeclarationFilter f)

  Returns a filter that selects those declarations selected by either this filter or another.

  Parameters:
    `f` - filter to be composed with this one
  Returns:
    a filter that selects those declarations selected by either this filter or another

### not

    public DeclarationFilter not()

  Returns a filter that selects those declarations not selected by this filter.

  Returns:
    a filter that selects those declarations not selected by this filter

### matches

    public boolean matches(Declaration decl)

  Tests whether this filter matches a given declaration. The default implementation always returns `true`; subclasses should override this.

  Parameters:
    `decl` - the declaration to match
  Returns:
    `true` if this filter matches the given declaration

### filter

    public <D extends Declaration> Collection<D> filter(Collection<D> decls)

  Returns the declarations matched by this filter. The result is a collection of the same type as the argument; the two-parameter version of `filter` offers control over the result type.

  Type Parameters:
    `D` - type of the declarations being filtered
  Parameters:
    `decls` - declarations being filtered
  Returns:
    the declarations matched by this filter

### filter

    public <D extends Declaration> Collection<D> filter(Collection<? extends Declaration> decls,
                                                        Class<D> resType)

  Returns the declarations matched by this filter, with the result being restricted to declarations of a given kind. Similar to the simpler single-parameter version of `filter`, but the result type is specified explicitly.

  Type Parameters:
    `D` - type of the declarations being returned
  Parameters:
    `decls` - declarations being filtered
    `resType` - type of the declarations being returned -- the reflective view of `D`
  Returns:
    the declarations matched by this filter, restricted to those of the specified type

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