compound-predicates.h

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// Copyright 2012 Cloudera Inc.
//
// Licensed 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.


#ifndef IMPALA_EXPRS_COMPOUND_PREDICATES_H_
#define IMPALA_EXPRS_COMPOUND_PREDICATES_H_

#include <string>
#include "exprs/predicate.h"
#include "gen-cpp/Exprs_types.h"

using namespace impala_udf;

namespace impala {

class CompoundPredicate: public Predicate {
 public:
  static BooleanVal Not(FunctionContext* context, const BooleanVal&);
  
 protected:
  CompoundPredicate(const TExprNode& node) : Predicate(node) { }

  Status CodegenComputeFn(bool and_fn, RuntimeState* state, llvm::Function** fn);
};

class AndPredicate: public CompoundPredicate {
 public:
  virtual impala_udf::BooleanVal GetBooleanVal(ExprContext* context, TupleRow*);

  virtual Status GetCodegendComputeFn(RuntimeState* state, llvm::Function** fn) {
    return CompoundPredicate::CodegenComputeFn(true, state, fn);
  }

 protected:
  friend class Expr;
  AndPredicate(const TExprNode& node) : CompoundPredicate(node) { }

  virtual std::string DebugString() const {
    std::stringstream out;
    out << "AndPredicate(" << Expr::DebugString() << ")";
    return out.str();
  }

 private:
  friend class OpcodeRegistry;
};

class OrPredicate: public CompoundPredicate {
 public:
  virtual impala_udf::BooleanVal GetBooleanVal(ExprContext* context, TupleRow*);

  virtual Status GetCodegendComputeFn(RuntimeState* state, llvm::Function** fn) {
    return CompoundPredicate::CodegenComputeFn(false, state, fn);
  }

 protected:
  friend class Expr;
  OrPredicate(const TExprNode& node) : CompoundPredicate(node) { }

  virtual std::string DebugString() const {
    std::stringstream out;
    out << "OrPredicate(" << Expr::DebugString() << ")";
    return out.str();
  }

 private:
  friend class OpcodeRegistry;
};

}

#endif