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 }