1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/test/tools/javac/lambda/lambdaExecution/TMapper.java Wed Apr 27 01:34:52 2016 +0800
1.3 @@ -0,0 +1,68 @@
1.4 +/*
1.5 + * Copyright (c) 2010, 2011, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation. Oracle designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Oracle in the LICENSE file that accompanied this code.
1.13 + *
1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 + * version 2 for more details (a copy is included in the LICENSE file that
1.18 + * accompanied this code).
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License version
1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 + *
1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 + * or visit www.oracle.com if you need additional information or have any
1.26 + * questions.
1.27 + */
1.28 +
1.29 +/**
1.30 + * Given an input object maps to an appropriate output object. A mapper may
1.31 + * variously provide a mapping between types, object instances or keys and
1.32 + * values or any other form of transformation upon the input.
1.33 + *
1.34 + * <p/>All mapper implementations are expected to:
1.35 + * <ul>
1.36 + * <li>Provide stable results such that for any {@code t} the result of two
1.37 + * {@code map} operations are always equivalent. ie.<pre>
1.38 + * Foo one = mapper.map(a);
1.39 + * Foo two = mapper.map(a);
1.40 + *
1.41 + * assert one.equals(two) && two.equals(one);
1.42 + * </pre></li>
1.43 + * <li>Equivalent input objects should map to equivalent output objects. ie.<pre>
1.44 + * assert a.equals(b); // a and b are equivalent
1.45 + *
1.46 + * Foo x = mapper.map(a);
1.47 + * Foo y = mapper.map(b);
1.48 + *
1.49 + * assert x.equals(y); // their mapped results should be as equivalent.
1.50 + * </pre></li>
1.51 + * <li>The mapper should not modify the input object in any way that would
1.52 + * change the mapping.</li>
1.53 + * <li>When used for aggregate operations upon many elements mappers
1.54 + * should not assume that the {@code map} operation will be called upon elements
1.55 + * in any specific order.</li>
1.56 + * </ul>
1.57 + *
1.58 + * @param <R> the type of output objects from {@code map} operation. May be the
1.59 + * @param <T> the type of input objects provided to the {@code map} operation.
1.60 + * same type as {@code <T>}.
1.61 + */
1.62 +public interface TMapper<R, T> {
1.63 +
1.64 + /**
1.65 + * Map the provided input object to an appropriate output object.
1.66 + *
1.67 + * @param t the input object to be mapped.
1.68 + * @return the mapped output object.
1.69 + */
1.70 + R map(T t);
1.71 +}
