jdk8-mips64-public/langtools: src/share/classes/javax/lang/model/util/ElementFilter.java@c75be5bc5283 (annotated)

src/share/classes/javax/lang/model/util/ElementFilter.java@c75be5bc5283 (annotated)

src/share/classes/javax/lang/model/util/ElementFilter.java

Tue, 09 Oct 2012 19:10:00 -0700

author: jjg
date: Tue, 09 Oct 2012 19:10:00 -0700
changeset 1357: c75be5bc5283
parent 554: 9d9f26857129
child 1442: fcf89720ae71
permissions: -rw-r--r--

8000663: clean up langtools imports
Reviewed-by: darcy

 /*
  * Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */
 package javax.lang.model.util;
 import java.util.Collections;
 import java.util.List;
 import java.util.Set;
 import java.util.EnumSet;
 import java.util.ArrayList;
 import java.util.LinkedHashSet;
 import javax.lang.model.element.*;
 /**
  * Filters for selecting just the elements of interest from a
  * collection of elements.  The returned sets and lists are new
  * collections and do use the argument as a backing store.  The
  * methods in this class do not make any attempts to guard against
  * concurrent modifications of the arguments.  The returned sets and
  * lists are mutable but unsafe for concurrent access.  A returned set
  * has the same iteration order as the argument set to a method.
  *
  * <p>If iterables and sets containing {@code null} are passed as
  * arguments to methods in this class, a {@code NullPointerException}
  * will be thrown.
  *
  * <p>Note that a <i>static import</i> statement can make the text of
  * calls to the methods in this class more concise; for example:
  *
  * <blockquote><pre>
  *     import static javax.lang.model.util.ElementFilter.*;
  *     ...
  *         {@code List<VariableElement>} fs = fieldsIn(someClass.getEnclosedElements());
  * </pre></blockquote>
  *
  * @author Joseph D. Darcy
  * @author Scott Seligman
  * @author Peter von der Ah&eacute;
  * @author Martin Buchholz
  * @since 1.6
  */
 public class ElementFilter {
     private ElementFilter() {} // Do not instantiate.
     private static Set<ElementKind> CONSTRUCTOR_KIND =
         Collections.unmodifiableSet(EnumSet.of(ElementKind.CONSTRUCTOR));
     private static Set<ElementKind> FIELD_KINDS =
         Collections.unmodifiableSet(EnumSet.of(ElementKind.FIELD,
                                                ElementKind.ENUM_CONSTANT));
     private static Set<ElementKind> METHOD_KIND =
         Collections.unmodifiableSet(EnumSet.of(ElementKind.METHOD));
     private static Set<ElementKind> PACKAGE_KIND =
         Collections.unmodifiableSet(EnumSet.of(ElementKind.PACKAGE));
     private static Set<ElementKind> TYPE_KINDS =
         Collections.unmodifiableSet(EnumSet.of(ElementKind.CLASS,
                                                ElementKind.ENUM,
                                                ElementKind.INTERFACE,
                                                ElementKind.ANNOTATION_TYPE));
     /**
      * Returns a list of fields in {@code elements}.
      * @return a list of fields in {@code elements}
      * @param elements the elements to filter
      */
     public static List<VariableElement>
             fieldsIn(Iterable<? extends Element> elements) {
         return listFilter(elements, FIELD_KINDS, VariableElement.class);
     }
     /**
      * Returns a set of fields in {@code elements}.
      * @return a set of fields in {@code elements}
      * @param elements the elements to filter
      */
     public static Set<VariableElement>
             fieldsIn(Set<? extends Element> elements) {
         return setFilter(elements, FIELD_KINDS, VariableElement.class);
     }
     /**
      * Returns a list of constructors in {@code elements}.
      * @return a list of constructors in {@code elements}
      * @param elements the elements to filter
      */
     public static List<ExecutableElement>
             constructorsIn(Iterable<? extends Element> elements) {
         return listFilter(elements, CONSTRUCTOR_KIND, ExecutableElement.class);
     }
     /**
      * Returns a set of constructors in {@code elements}.
      * @return a set of constructors in {@code elements}
      * @param elements the elements to filter
      */
     public static Set<ExecutableElement>
             constructorsIn(Set<? extends Element> elements) {
         return setFilter(elements, CONSTRUCTOR_KIND, ExecutableElement.class);
     }
     /**
      * Returns a list of methods in {@code elements}.
      * @return a list of methods in {@code elements}
      * @param elements the elements to filter
      */
     public static List<ExecutableElement>
             methodsIn(Iterable<? extends Element> elements) {
         return listFilter(elements, METHOD_KIND, ExecutableElement.class);
     }
     /**
      * Returns a set of methods in {@code elements}.
      * @return a set of methods in {@code elements}
      * @param elements the elements to filter
      */
     public static Set<ExecutableElement>
             methodsIn(Set<? extends Element> elements) {
         return setFilter(elements, METHOD_KIND, ExecutableElement.class);
     }
     /**
      * Returns a list of types in {@code elements}.
      * @return a list of types in {@code elements}
      * @param elements the elements to filter
      */
     public static List<TypeElement>
             typesIn(Iterable<? extends Element> elements) {
         return listFilter(elements, TYPE_KINDS, TypeElement.class);
     }
     /**
      * Returns a set of types in {@code elements}.
      * @return a set of types in {@code elements}
      * @param elements the elements to filter
      */
     public static Set<TypeElement>
             typesIn(Set<? extends Element> elements) {
         return setFilter(elements, TYPE_KINDS, TypeElement.class);
     }
     /**
      * Returns a list of packages in {@code elements}.
      * @return a list of packages in {@code elements}
      * @param elements the elements to filter
      */
     public static List<PackageElement>
             packagesIn(Iterable<? extends Element> elements) {
         return listFilter(elements, PACKAGE_KIND, PackageElement.class);
     }
     /**
      * Returns a set of packages in {@code elements}.
      * @return a set of packages in {@code elements}
      * @param elements the elements to filter
      */
     public static Set<PackageElement>
             packagesIn(Set<? extends Element> elements) {
         return setFilter(elements, PACKAGE_KIND, PackageElement.class);
     }
     // Assumes targetKinds and E are sensible.
     private static <E extends Element> List<E> listFilter(Iterable<? extends Element> elements,
                                                           Set<ElementKind> targetKinds,
                                                           Class<E> clazz) {
         List<E> list = new ArrayList<E>();
         for (Element e : elements) {
             if (targetKinds.contains(e.getKind()))
                 list.add(clazz.cast(e));
         }
         return list;
     }
     // Assumes targetKinds and E are sensible.
     private static <E extends Element> Set<E> setFilter(Set<? extends Element> elements,
                                                         Set<ElementKind> targetKinds,
                                                         Class<E> clazz) {
         // Return set preserving iteration order of input set.
         Set<E> set = new LinkedHashSet<E>();
         for (Element e : elements) {
             if (targetKinds.contains(e.getKind()))
                 set.add(clazz.cast(e));
         }
         return set;
     }
 }

Mercurial > jdk8-mips64-public > langtools / annotate

src/share/classes/javax/lang/model/util/ElementFilter.java@c75be5bc5283 (annotated)

src/share/classes/javax/lang/model/util/ElementFilter.java