aoqi@0: /*
aoqi@0:  * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  */
aoqi@0: 
aoqi@0: /*SAM types:
aoqi@0:          1. An interface that has a single abstract method
aoqi@0:          2. Having more than one distinct methods, but only one is "real", the others are overriden public methods in Object - example: Comparator<T>
aoqi@0:          3. Having more than one methods due to inheritance, but they have the same signature
aoqi@0:          4. Having more than one methods due to inheritance, but one of them has a subsignature of all other methods
aoqi@0:                 a) parameter types compatible
aoqi@0:                 b) return type substitutable
aoqi@0:                 c) thrown type not conflicting with the thrown clause of any other method
aoqi@0:                 d) mixed up
aoqi@0:          5. Type-dependent SAM types
aoqi@0:   non-SAM types:
aoqi@0:          6. An interface that has a single abstract method, which is also public method in Object
aoqi@0:          7. Having more than one methods due to inheritance, and none of them has a subsignature of all other methods
aoqi@0: */
aoqi@0: 
aoqi@0: import java.util.List;
aoqi@0: import java.util.Collection;
aoqi@0: import java.sql.SQLException;
aoqi@0: import java.sql.SQLTransientException;
aoqi@0: import java.util.concurrent.TimeoutException;
aoqi@0: import java.io.*;
aoqi@0: 
aoqi@0: interface A {int getOldest(List<Number> list);}
aoqi@0: interface B {int getOldest(List list);}
aoqi@0: interface C {int getOldest(List<?> list);}
aoqi@0: interface D {int getOldest(List<Integer> list);}
aoqi@0: interface E {int getOldest(Collection<?> collection);}
aoqi@0: //Not SAM type, case #7
aoqi@0: interface DE extends D, E {}
aoqi@0: 
aoqi@0: interface Foo {int getAge(Number n);}
aoqi@0: interface Bar {int getAge(Integer i);}
aoqi@0: //Not SAM type, case #7
aoqi@0: interface FooBar extends Foo, Bar {}
aoqi@0: 
aoqi@0: //Not SAM type, case #6
aoqi@0: interface Planet {boolean equals(Object o);}
aoqi@0: 
aoqi@0: // SAM type interfaces:
aoqi@0: // type #2:
aoqi@0: //only one abstract non-Ojbect method getAge()
aoqi@0: interface Mars<T> extends Planet {int getAge(T t);}
aoqi@0: //only one abstract non-Ojbect method increment()
aoqi@0: interface Jupiter {
aoqi@0:     boolean equals(Object o);
aoqi@0:     String toString();
aoqi@0:     int increment(int i);
aoqi@0: }
aoqi@0: 
aoqi@0: // type #3:
aoqi@0: interface X {int getTotal(List<String> arg);}
aoqi@0: interface Y {int getTotal(List<String> strs);}
aoqi@0: //SAM type ([List<String>], int, {})
aoqi@0: interface XY extends X, Y {}
aoqi@0: //SAM type ([List<String>], int, {})
aoqi@0: interface XYZ extends X, Y, XY {}
aoqi@0: 
aoqi@0: // type #4 a):
aoqi@0: //SAM type ([List], int, {})
aoqi@0: interface AB extends A, B {}
aoqi@0: 
aoqi@0: // type #4 b):
aoqi@0: interface F {Number getValue(String str);}
aoqi@0: interface G {Integer getValue(String str);}
aoqi@0: interface H {Serializable getValue(String str);}
aoqi@0: interface I {Object getValue(String str);}
aoqi@0: //SAM type ([String], Integer, {})
aoqi@0: interface FGHI extends F, G, H, I {}
aoqi@0: 
aoqi@0: interface J {List<Number> getAll(String str);}
aoqi@0: interface K {List<?> getAll(String str);}
aoqi@0: interface L {List getAll(String str);}
aoqi@0: interface M {Collection getAll(String str);}
aoqi@0: //SAM type ([String], List<Number>/List, {}) - the return type is flexible to some degree
aoqi@0: interface JK extends J, K {}
aoqi@0: //SAM type ([String], List<Number>/List, {})
aoqi@0: interface JL extends J, L {}
aoqi@0: //SAM type ([String], List<Number>/List, {})
aoqi@0: interface JKL extends J, K, L {}
aoqi@0: //SAM type ([String], List<Number>/List, {})
aoqi@0: interface JKLM extends J, K, L, M {}
aoqi@0: 
aoqi@0: // type #4 c):
aoqi@0: interface N {String getText(File f) throws IOException;}
aoqi@0: interface O {String getText(File f) throws FileNotFoundException;}
aoqi@0: interface P {String getText(File f) throws NullPointerException;}
aoqi@0: //SAM type ([File], String, {FileNotFoundException})
aoqi@0: interface NO extends N, O {}
aoqi@0: //SAM type ([File], String, {})
aoqi@0: interface NOP extends N, O, P {}
aoqi@0: 
aoqi@0: interface Boo {int getAge(String s) throws IOException;}
aoqi@0: interface Doo {int getAge(String s) throws SQLException;}
aoqi@0: //SAM type ([String], int, {})
aoqi@0: interface BooDoo extends Boo, Doo {}
aoqi@0: 
aoqi@0: // type #4 d):
aoqi@0: interface Q {Iterable m(Iterable<String> arg);}
aoqi@0: interface R {Iterable<String> m(Iterable arg);}
aoqi@0: //SAM type ([Iterable], Iterable<String>/Iterable, {})
aoqi@0: interface QR extends Q, R {}
aoqi@0: 
aoqi@0: interface U {Collection foo(List<String> arg) throws IOException, SQLTransientException;}
aoqi@0: interface V {List<?> foo(List<String> arg) throws EOFException, SQLException, TimeoutException;}
aoqi@0: interface W {List<String> foo(List arg) throws Exception;}
aoqi@0: //SAM type ([List<String>], List<String>/List, {EOFException, SQLTransientException})
aoqi@0: interface UV extends U, V {}
aoqi@0: // SAM type ([List], List<String>/List, {EOFException, SQLTransientException})
aoqi@0: interface UVW extends U, V, W {}
aoqi@0: 
aoqi@0: // type #5:
aoqi@0: // Not a SAM because sam-ness depends on instantiation of type-variables
aoqi@0: interface Qoo<T> {void m(T arg);}
aoqi@0: interface Roo<S extends Number> {void m(S arg);}
aoqi@0: interface QooRoo<T1, T2 extends Number, T3> extends Qoo<T1>, Roo<T2> {}