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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/lang/reflect/WildcardType.java | |
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Diffstat (limited to 'libjava/classpath/java/lang/reflect/WildcardType.java')
-rw-r--r-- | libjava/classpath/java/lang/reflect/WildcardType.java | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/libjava/classpath/java/lang/reflect/WildcardType.java b/libjava/classpath/java/lang/reflect/WildcardType.java new file mode 100644 index 000000000..43b5d0a40 --- /dev/null +++ b/libjava/classpath/java/lang/reflect/WildcardType.java @@ -0,0 +1,115 @@ +/* WildcardType.java -- A wildcard type expression e.g. ? extends String + Copyright (C) 2004, 2005 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath 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 for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.lang.reflect; + +/** + * Represents a wildcard type expression, where the type variable + * is unnamed. The simplest example of this is <code>?</code>, + * which represents any unbounded type. Another example is + * <code>? extends Number</code>, which specifies any type + * which is a subclass of <code>Number</code> (<code>Number</code> + * is the upper bound). + * </p> + * <p> + * <code>? super String</code> gives the type a less common lower bound, + * which means that the type must be either a <code>String</code> or one + * of its superclasses. This can be useful in working with collections. + * You may want a method to add instances of a class to a collection + * with a more generic type (e.g. adding <code>String</code>s to + * a list of <code>Object</code>s), but don't want to allow users + * to pass in a collection with a more specific type. + * </p> + * + * @author Tom Tromey (tromey@redhat.com) + * @author Andrew John Hughes (gnu_andrew@member.fsf.org) + * @since 1.5 + */ +public interface WildcardType extends Type +{ + + /** + * <p> + * Returns an array of <code>Type</code>s, which specify the + * lower bounds of this type. The default lower bound is + * <code>null</code>, which causes this method to return an + * empty array. + * </p> + * <p> + * In generating the array of <code>Type</code>s, each + * <code>ParameterizedType</code> or <code>TypeVariable</code> is + * created, (see the documentation for these classes for details of this + * process), if necessary, while all other types are simply + * resolved. + * </p> + * + * @return an array of <code>Type</code> objects, representing + * the wildcard type's lower bounds. + * @throws TypeNotPresentException if any of the types referred to by + * the lower bounds of this type do not actually exist. + * @throws MalformedParameterizedTypeException if any of the types + * refer to a type which can not be instantiated. + */ + Type[] getLowerBounds(); + + /** + * <p> + * Returns an array of <code>Type</code>s, which specify the + * upper bounds of this type. The default upper bound is + * <code>Object</code>, which causes this method to return an + * array, containing just the <code>Type</code> instance for + * <code>Object</code>. + * </p> + * <p> + * In generating the array of <code>Type</code>s, each + * <code>ParameterizedType</code> or <code>TypeVariable</code> is + * created, (see the documentation for these classes for details of this + * process), if necessary, while all other types are simply + * resolved. + * </p> + * + * @return an array of <code>Type</code> objects, representing + * the wildcard type's upper bounds. + * @throws TypeNotPresentException if any of the types referred to by + * the upper bounds of this type do not actually exist. + * @throws MalformedParameterizedTypeException if any of the types + * refer to a type which can not be instantiated. + */ + Type[] getUpperBounds(); + +} |