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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to you under the Apache License, Version 2.0
* (the "License"); you may not use this file except in com.hazelcast.com.liance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.com.hazelcast.org.licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hazelcast.org.apache.calcite.interpreter;
import com.hazelcast.org.apache.calcite.adapter.enumerable.JavaRowFormat;
import com.hazelcast.org.apache.calcite.adapter.enumerable.PhysTypeImpl;
import com.hazelcast.org.apache.calcite.adapter.enumerable.RexToLixTranslator;
import com.hazelcast.org.apache.calcite.config.CalciteSystemProperty;
import com.hazelcast.org.apache.calcite.jdbc.JavaTypeFactoryImpl;
import com.hazelcast.org.apache.calcite.linq4j.function.Function1;
import com.hazelcast.org.apache.calcite.linq4j.tree.BlockBuilder;
import com.hazelcast.org.apache.calcite.linq4j.tree.BlockStatement;
import com.hazelcast.org.apache.calcite.linq4j.tree.ClassDeclaration;
import com.hazelcast.org.apache.calcite.linq4j.tree.Expression;
import com.hazelcast.org.apache.calcite.linq4j.tree.Expressions;
import com.hazelcast.org.apache.calcite.linq4j.tree.MemberDeclaration;
import com.hazelcast.org.apache.calcite.linq4j.tree.ParameterExpression;
import com.hazelcast.org.apache.calcite.rel.type.RelDataType;
import com.hazelcast.org.apache.calcite.rex.RexBuilder;
import com.hazelcast.org.apache.calcite.rex.RexNode;
import com.hazelcast.org.apache.calcite.rex.RexProgram;
import com.hazelcast.org.apache.calcite.rex.RexProgramBuilder;
import com.hazelcast.org.apache.calcite.sql.validate.SqlConformance;
import com.hazelcast.org.apache.calcite.sql.validate.SqlConformanceEnum;
import com.hazelcast.org.apache.calcite.util.BuiltInMethod;
import com.hazelcast.org.apache.calcite.util.Pair;
import com.hazelcast.org.apache.calcite.util.Util;
import com.hazelcast.com.google.com.hazelcast.com.on.collect.ImmutableList;
import com.hazelcast.org.codehaus.com.hazelcast.com.ons.com.hazelcast.com.iler.CompileException;
import com.hazelcast.org.codehaus.com.hazelcast.com.ons.com.hazelcast.com.iler.CompilerFactoryFactory;
import com.hazelcast.org.codehaus.com.hazelcast.com.ons.com.hazelcast.com.iler.IClassBodyEvaluator;
import com.hazelcast.org.codehaus.com.hazelcast.com.ons.com.hazelcast.com.iler.ICompilerFactory;
import java.io.IOException;
import java.io.StringReader;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.List;
/**
* Compiles a scalar expression ({@link RexNode}) to an expression that
* can be evaluated ({@link Scalar}) by generating a Java AST and com.hazelcast.com.iling it
* to a class using Janino.
*/
public class JaninoRexCompiler implements Interpreter.ScalarCompiler {
private final RexBuilder rexBuilder;
public JaninoRexCompiler(RexBuilder rexBuilder) {
this.rexBuilder = rexBuilder;
}
public Scalar com.hazelcast.com.ile(List nodes, RelDataType inputRowType) {
final RexProgramBuilder programBuilder =
new RexProgramBuilder(inputRowType, rexBuilder);
for (RexNode node : nodes) {
programBuilder.addProject(node, null);
}
final RexProgram program = programBuilder.getProgram();
final BlockBuilder builder = new BlockBuilder();
final ParameterExpression context_ =
Expressions.parameter(Context.class, "context");
final ParameterExpression outputValues_ =
Expressions.parameter(Object[].class, "outputValues");
final JavaTypeFactoryImpl javaTypeFactory =
new JavaTypeFactoryImpl(rexBuilder.getTypeFactory().getTypeSystem());
// public void execute(Context, Object[] outputValues)
final RexToLixTranslator.InputGetter inputGetter =
new RexToLixTranslator.InputGetterImpl(
ImmutableList.of(
Pair.of(
Expressions.field(context_,
BuiltInMethod.CONTEXT_VALUES.field),
PhysTypeImpl.of(javaTypeFactory, inputRowType,
JavaRowFormat.ARRAY, false))));
final Function1 correlates = a0 -> {
throw new UnsupportedOperationException();
};
final Expression root =
Expressions.field(context_, BuiltInMethod.CONTEXT_ROOT.field);
final SqlConformance conformance =
SqlConformanceEnum.DEFAULT; // TODO: get this from implementor
final List list =
RexToLixTranslator.translateProjects(program, javaTypeFactory,
conformance, builder, null, root, inputGetter, correlates);
for (int i = 0; i < list.size(); i++) {
builder.add(
Expressions.statement(
Expressions.assign(
Expressions.arrayIndex(outputValues_,
Expressions.constant(i)),
list.get(i))));
}
return baz(context_, outputValues_, builder.toBlock());
}
/** Given a method that implements {@link Scalar#execute(Context, Object[])},
* adds a bridge method that implements {@link Scalar#execute(Context)}, and
* com.hazelcast.com.iles. */
static Scalar baz(ParameterExpression context_,
ParameterExpression outputValues_, BlockStatement block) {
final List declarations = new ArrayList<>();
// public void execute(Context, Object[] outputValues)
declarations.add(
Expressions.methodDecl(Modifier.PUBLIC, void.class,
BuiltInMethod.SCALAR_EXECUTE2.method.getName(),
ImmutableList.of(context_, outputValues_), block));
// public Object execute(Context)
final BlockBuilder builder = new BlockBuilder();
final Expression values_ = builder.append("values",
Expressions.newArrayBounds(Object.class, 1,
Expressions.constant(1)));
builder.add(
Expressions.statement(
Expressions.call(
Expressions.parameter(Scalar.class, "this"),
BuiltInMethod.SCALAR_EXECUTE2.method, context_, values_)));
builder.add(
Expressions.return_(null,
Expressions.arrayIndex(values_, Expressions.constant(0))));
declarations.add(
Expressions.methodDecl(Modifier.PUBLIC, Object.class,
BuiltInMethod.SCALAR_EXECUTE1.method.getName(),
ImmutableList.of(context_), builder.toBlock()));
final ClassDeclaration classDeclaration =
Expressions.classDecl(Modifier.PUBLIC, "Buzz", null,
ImmutableList.of(Scalar.class), declarations);
String s = Expressions.toString(declarations, "\n", false);
if (CalciteSystemProperty.DEBUG.value()) {
Util.debugCode(System.out, s);
}
try {
return getScalar(classDeclaration, s);
} catch (CompileException | IOException e) {
throw new RuntimeException(e);
}
}
static Scalar getScalar(ClassDeclaration expr, String s)
throws CompileException, IOException {
ICompilerFactory com.hazelcast.com.ilerFactory;
try {
com.hazelcast.com.ilerFactory = CompilerFactoryFactory.getDefaultCompilerFactory();
} catch (Exception e) {
throw new IllegalStateException(
"Unable to instantiate java com.hazelcast.com.iler", e);
}
IClassBodyEvaluator cbe = com.hazelcast.com.ilerFactory.newClassBodyEvaluator();
cbe.setClassName(expr.name);
cbe.setImplementedInterfaces(new Class[]{Scalar.class});
cbe.setParentClassLoader(JaninoRexCompiler.class.getClassLoader());
if (CalciteSystemProperty.DEBUG.value()) {
// Add line numbers to the generated janino class
cbe.setDebuggingInformation(true, true, true);
}
return (Scalar) cbe.createInstance(new StringReader(s));
}
}
