1 /*
2 * Copyright (c) 2024, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 import jdk.incubator.code.Op;
25 import jdk.incubator.code.analysis.Inliner;
26 import jdk.incubator.code.dialect.java.ClassType;
27 import jdk.incubator.code.dialect.java.JavaOp;
28 import jdk.incubator.code.dialect.java.MethodRef;
29 import jdk.incubator.code.dialect.java.JavaType;
30 import java.util.stream.Stream;
31
32 import static jdk.incubator.code.dialect.java.JavaType.parameterized;
33 import static jdk.incubator.code.dialect.java.MethodRef.method;
34 import static jdk.incubator.code.dialect.core.CoreOp.*;
35 import static jdk.incubator.code.dialect.core.CoreType.functionType;
36 import static jdk.incubator.code.dialect.java.JavaType.type;
37
38 public interface Queryable<T> {
39 JavaType TYPE = type(Queryable.class);
40
41 QueryProvider provider();
42
43 // T
44 JavaType elementType();
45
46 // Queryable<T> -> Queryable<U>
47 FuncOp expression();
48
49 @SuppressWarnings("unchecked")
50 default Queryable<T> where(QuotablePredicate<T> f) {
51 JavaOp.LambdaOp l = (JavaOp.LambdaOp) Op.ofQuotable(f).get().op();
52 return (Queryable<T>) insertQuery(elementType(), "where", l);
53 }
54
55 @SuppressWarnings("unchecked")
56 default <R> Queryable<R> select(QuotableFunction<T, R> f) {
57 JavaOp.LambdaOp l = (JavaOp.LambdaOp) Op.ofQuotable(f).get().op();
58 return (Queryable<R>) insertQuery((JavaType) l.invokableType().returnType(), "select", l);
59 }
60
61 private Queryable<?> insertQuery(JavaType elementType, String methodName, JavaOp.LambdaOp lambdaOp) {
62 // Copy function expression, replacing return operation
63 FuncOp queryExpression = expression();
64 JavaType queryableType = parameterized(Queryable.TYPE, elementType);
65 FuncOp nextQueryExpression = func("query",
66 functionType(queryableType, queryExpression.invokableType().parameterTypes()))
67 .body(b -> Inliner.inline(b, queryExpression, b.parameters(), (block, query) -> {
68 Op.Result fi = block.op(lambdaOp);
69
70 MethodRef md = method(Queryable.TYPE, methodName,
71 functionType(Queryable.TYPE, ((ClassType) lambdaOp.functionalInterface()).rawType()));
72 Op.Result queryable = block.op(JavaOp.invoke(queryableType, md, query, fi));
73
74 block.op(return_(queryable));
75 }));
76
77 return provider().createQuery(elementType, nextQueryExpression);
78 }
79
80 @SuppressWarnings("unchecked")
81 default QueryResult<Stream<T>> elements() {
82 JavaType resultType = parameterized(type(Stream.class), elementType());
83 return (QueryResult<Stream<T>>) insertQueryResult(resultType, "elements");
84 }
85
86 @SuppressWarnings("unchecked")
87 default QueryResult<Long> count() {
88 JavaType resultType = JavaType.LONG;
89 return (QueryResult<Long>) insertQueryResult(resultType, "count");
90 }
91
92 private QueryResult<?> insertQueryResult(JavaType resultType, String methodName) {
93 // Copy function expression, replacing return operation
94 FuncOp queryExpression = expression();
95 JavaType queryResultType = parameterized(QueryResult.TYPE, resultType);
96 FuncOp queryResultExpression = func("queryResult",
97 functionType(queryResultType, queryExpression.invokableType().parameterTypes()))
98 .body(b -> Inliner.inline(b, queryExpression, b.parameters(), (block, query) -> {
99 MethodRef md = method(Queryable.TYPE, methodName,
100 functionType(QueryResult.TYPE));
101 Op.Result queryResult = block.op(JavaOp.invoke(queryResultType, md, query));
102
103 block.op(return_(queryResult));
104 }));
105
106 return provider().createQueryResult(resultType, queryResultExpression);
107 }
108 }