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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
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tree976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/lang/reflect/WildcardType.java
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+/* 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();
+
+}