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annotate truffle/com.oracle.truffle.api.dsl/src/com/oracle/truffle/api/dsl/TypeSystem.java @ 22157:dc83cc1f94f2

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Using fully qualified imports
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Wed, 16 Sep 2015 11:33:22 +0200
parents 503529c65456
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1 /*
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2 * Copyright (c) 2012, 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation. Oracle designates this
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8 * particular file as subject to the "Classpath" exception as provided
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9 * by Oracle in the LICENSE file that accompanied this code.
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10 *
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11 * This code is distributed in the hope that it will be useful, but WITHOUT
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 * version 2 for more details (a copy is included in the LICENSE file that
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15 * accompanied this code).
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16 *
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17 * You should have received a copy of the GNU General Public License version
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18 * 2 along with this work; if not, write to the Free Software Foundation,
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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20 *
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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22 * or visit www.oracle.com if you need additional information or have any
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23 * questions.
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24 */
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25 package com.oracle.truffle.api.dsl;
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26
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27 import com.oracle.truffle.api.nodes.Node;
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28 import java.lang.annotation.ElementType;
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29 import java.lang.annotation.Retention;
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30 import java.lang.annotation.RetentionPolicy;
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31 import java.lang.annotation.Target;
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33 /**
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34 * <p>
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35 * Each {@link Node} has one {@link TypeSystem} at its root to define the types that can be used
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36 * throughout the system. Multiple {@link TypeSystem}s are allowed, but they cannot be mixed inside
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37 * a single {@link Node} hierarchy. A {@link TypeSystem} defines a list of types as its child
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38 * elements, in which every type precedes its super types.The latter condition ensures that the most
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39 * concrete type is found first when searching the list sequentially for the type of a given generic
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40 * value.
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41 * </p>
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42 *
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43 * <p>
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44 * Each {@link #value()} is represented as a java type. A type can specify two annotations:
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45 * {@link TypeCheck} and {@link TypeCast}. The {@link TypeCheck} checks whether a given generic
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46 * value matches to the current type. The {@link TypeCast} casts a generic type value to the current
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47 * type. If the {@link TypeCheck} and {@link TypeCast} annotations are not declared in the
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48 * {@link TypeSystem} the a default implementation is provided. The default implementation of
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49 * {@link TypeCheck} returns <code>true</code> only on an exact type match and {@link TypeCast} is
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50 * only a cast to this type. Specified methods with {@link TypeCheck} and {@link TypeCast} may be
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51 * used to extend the definition of a type in the language. In our example, the
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52 * <code>isInteger</code> and <code>asInteger</code> methods are defined in a way so that they
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53 * accept also {@link Integer} values, implicitly converting them to {@link Double} . This example
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54 * points out how we express implicit type conversions.
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55 * </p>
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56 *
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57 * <p>
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58 * <b>Example:</b> The {@link TypeSystem} contains the types {@link Boolean}, {@link Integer}, and
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59 * {@link Double}. The type {@link Object} is always used implicitly as the generic type represent
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60 * all values.
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61 *
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62 * <pre>
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63 *
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64 * {@literal @}TypeSystem(types = {boolean.class, int.class, double.class})
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65 * public abstract class ExampleTypeSystem {
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66 *
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67 * {@literal @}TypeCheck
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68 * public boolean isInteger(Object value) {
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69 * return value instanceof Integer || value instanceof Double;
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70 * }
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71 *
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72 * {@literal @}TypeCast
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73 * public double asInteger(Object value) {
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74 * return ((Number)value).doubleValue();
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75 * }
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76 * }
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77 * </pre>
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78 *
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79 *
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80 * @see TypeCast
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81 * @see TypeCheck
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82 */
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83 @Retention(RetentionPolicy.CLASS)
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84 @Target({ElementType.TYPE})
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85 public @interface TypeSystem {
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87 /**
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88 * The list of types as child elements of the {@link TypeSystem}. Each precedes its super type.
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89 */
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90 Class<?>[] value();
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92 }