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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 compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.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 org.apache.drill.exec.expr.fn;
import static org.apache.drill.shaded.guava.com.google.common.base.Preconditions.checkNotNull;
import com.sun.codemodel.JOp;
import org.apache.drill.common.exceptions.DrillRuntimeException;
import org.apache.drill.common.expression.FieldReference;
import org.apache.drill.common.types.TypeProtos.DataMode;
import org.apache.drill.common.types.TypeProtos.MajorType;
import org.apache.drill.exec.expr.ClassGenerator;
import org.apache.drill.exec.expr.ClassGenerator.BlockType;
import org.apache.drill.exec.expr.ClassGenerator.HoldingContainer;
import org.apache.drill.exec.expr.DrillSimpleFunc;
import org.apache.drill.exec.expr.annotations.FunctionTemplate.NullHandling;
import com.sun.codemodel.JBlock;
import com.sun.codemodel.JConditional;
import com.sun.codemodel.JExpr;
import com.sun.codemodel.JExpression;
import com.sun.codemodel.JMod;
import com.sun.codemodel.JVar;
public class DrillSimpleFuncHolder extends DrillFuncHolder {
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(DrillSimpleFuncHolder.class);
private final String drillFuncClass;
// each function should be wrapped unique class loader associated with its jar
// to prevent classpath collisions during loading and unloading jars
private final ClassLoader classLoader;
public DrillSimpleFuncHolder(FunctionAttributes functionAttributes, FunctionInitializer initializer) {
super(functionAttributes, initializer);
drillFuncClass = checkNotNull(initializer.getClassName());
classLoader = checkNotNull(initializer.getClassLoader());
}
private String setupBody() {
return meth("setup", false);
}
private String evalBody() {
return meth("eval");
}
private String resetBody() {
return meth("reset", false);
}
private String cleanupBody() {
return meth("cleanup", false);
}
@Override
public boolean isNested() {
return false;
}
public DrillSimpleFunc createInterpreter() throws Exception {
return (DrillSimpleFunc)Class.forName(drillFuncClass, true, classLoader).newInstance();
}
@Override
public HoldingContainer renderEnd(ClassGenerator<?> classGenerator, HoldingContainer[] inputVariables,
JVar[] workspaceJVars, FieldReference fieldReference) {
//If the function's annotation specifies a parameter has to be constant expression, but the HoldingContainer
//for the argument is not, then raise exception.
for (int i = 0; i < inputVariables.length; i++) {
if (getParameters()[i].isConstant() && !inputVariables[i].isConstant()) {
throw new DrillRuntimeException(String.format("The argument '%s' of Function '%s' has to be constant!", getParameters()[i].getName(), this.getRegisteredNames()[0]));
}
}
generateBody(classGenerator, BlockType.SETUP, setupBody(), inputVariables, workspaceJVars, true);
HoldingContainer c = generateEvalBody(classGenerator, inputVariables, evalBody(), workspaceJVars, fieldReference);
generateBody(classGenerator, BlockType.RESET, resetBody(), null, workspaceJVars, false);
generateBody(classGenerator, BlockType.CLEANUP, cleanupBody(), null, workspaceJVars, false);
return c;
}
protected HoldingContainer generateEvalBody(ClassGenerator<?> g, HoldingContainer[] inputVariables, String body,
JVar[] workspaceJVars, FieldReference ref) {
g.getEvalBlock().directStatement(String.format("//---- start of eval portion of %s function. ----//", getRegisteredNames()[0]));
JBlock sub = new JBlock(true, true);
JBlock topSub = sub;
HoldingContainer out = null;
MajorType returnValueType = getReturnType();
// add outside null handling if it is defined.
if (getNullHandling() == NullHandling.NULL_IF_NULL) {
JExpression e = null;
for (HoldingContainer v : inputVariables) {
if (v.isOptional()) {
JExpression isNullExpr;
if (v.isReader()) {
isNullExpr = JOp.cond(v.getHolder().invoke("isSet"), JExpr.lit(1), JExpr.lit(0));
} else {
isNullExpr = v.getIsSet();
}
if (e == null) {
e = isNullExpr;
} else {
e = e.mul(isNullExpr);
}
}
}
if (e != null) {
// if at least one expression must be checked, set up the conditional.
returnValueType = getReturnType().toBuilder().setMode(DataMode.OPTIONAL).build();
out = g.declare(returnValueType);
e = e.eq(JExpr.lit(0));
JConditional jc = sub._if(e);
jc._then().assign(out.getIsSet(), JExpr.lit(0));
sub = jc._else();
}
}
if (out == null) {
out = g.declare(returnValueType);
}
// add the subblock after the out declaration.
g.getEvalBlock().add(topSub);
JVar internalOutput = sub.decl(JMod.FINAL, g.getHolderType(returnValueType), getReturnValue().getName(), JExpr._new(g.getHolderType(returnValueType)));
addProtectedBlock(g, sub, body, inputVariables, workspaceJVars, false);
if (sub != topSub) {
sub.assign(internalOutput.ref("isSet"),JExpr.lit(1));// Assign null if NULL_IF_NULL mode
}
sub.assign(out.getHolder(), internalOutput);
if (sub != topSub) {
sub.assign(internalOutput.ref("isSet"),JExpr.lit(1));// Assign null if NULL_IF_NULL mode
}
g.getEvalBlock().directStatement(String.format("//---- end of eval portion of %s function. ----//", getRegisteredNames()[0]));
return out;
}
}
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