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.dialect.java.ClassType;
26 import jdk.incubator.code.dialect.java.JavaOp;
27 import jdk.incubator.code.dialect.java.MethodRef;
28 import jdk.incubator.code.dialect.java.JavaType;
29 import java.util.stream.Stream;
30
31 import static jdk.incubator.code.dialect.java.JavaType.parameterized;
32 import static jdk.incubator.code.dialect.java.MethodRef.method;
33 import static jdk.incubator.code.dialect.core.CoreOp.*;
34 import static jdk.incubator.code.dialect.core.CoreType.functionType;
35 import static jdk.incubator.code.dialect.java.JavaType.type;
36
37 public interface Queryable<T> {
38 JavaType TYPE = type(Queryable.class);
39
40 QueryProvider provider();
41
42 // T
43 JavaType elementType();
44
45 // Queryable<T> -> Queryable<U>
46 FuncOp expression();
47
48 @SuppressWarnings("unchecked")
49 default Queryable<T> where(QuotablePredicate<T> f) {
50 JavaOp.LambdaOp l = (JavaOp.LambdaOp) Op.ofQuotable(f).get().op();
51 return (Queryable<T>) insertQuery(elementType(), "where", l);
52 }
53
54 @SuppressWarnings("unchecked")
55 default <R> Queryable<R> select(QuotableFunction<T, R> f) {
56 JavaOp.LambdaOp l = (JavaOp.LambdaOp) Op.ofQuotable(f).get().op();
57 return (Queryable<R>) insertQuery((JavaType) l.invokableType().returnType(), "select", l);
58 }
59
60 private Queryable<?> insertQuery(JavaType elementType, String methodName, JavaOp.LambdaOp lambdaOp) {
61 // Copy function expression, replacing return operation
62 FuncOp queryExpression = expression();
63 JavaType queryableType = parameterized(Queryable.TYPE, elementType);
64 FuncOp nextQueryExpression = func("query",
65 functionType(queryableType, queryExpression.invokableType().parameterTypes()))
66 .body(b -> b.inline(queryExpression, b.parameters(), (block, query) -> {
67 Op.Result fi = block.op(lambdaOp);
68
69 MethodRef md = method(Queryable.TYPE, methodName,
70 functionType(Queryable.TYPE, ((ClassType) lambdaOp.functionalInterface()).rawType()));
71 Op.Result queryable = block.op(JavaOp.invoke(queryableType, md, query, fi));
72
73 block.op(return_(queryable));
74 }));
75
76 return provider().createQuery(elementType, nextQueryExpression);
77 }
78
79 @SuppressWarnings("unchecked")
80 default QueryResult<Stream<T>> elements() {
81 JavaType resultType = parameterized(type(Stream.class), elementType());
82 return (QueryResult<Stream<T>>) insertQueryResult(resultType, "elements");
83 }
84
85 @SuppressWarnings("unchecked")
86 default QueryResult<Long> count() {
87 JavaType resultType = JavaType.LONG;
88 return (QueryResult<Long>) insertQueryResult(resultType, "count");
89 }
90
91 private QueryResult<?> insertQueryResult(JavaType resultType, String methodName) {
92 // Copy function expression, replacing return operation
93 FuncOp queryExpression = expression();
94 JavaType queryResultType = parameterized(QueryResult.TYPE, resultType);
95 FuncOp queryResultExpression = func("queryResult",
96 functionType(queryResultType, queryExpression.invokableType().parameterTypes()))
97 .body(b -> b.inline(queryExpression, b.parameters(), (block, query) -> {
98 MethodRef md = method(Queryable.TYPE, methodName,
99 functionType(QueryResult.TYPE));
100 Op.Result queryResult = block.op(JavaOp.invoke(queryResultType, md, query));
101
102 block.op(return_(queryResult));
103 }));
104
105 return provider().createQueryResult(resultType, queryResultExpression);
106 }
107 }