| /* |
| * 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.common.expression.visitors; |
| |
| import org.apache.drill.common.expression.AnyValueExpression; |
| import org.apache.drill.common.expression.BooleanOperator; |
| import org.apache.drill.common.expression.CastExpression; |
| import org.apache.drill.common.expression.ConvertExpression; |
| import org.apache.drill.common.expression.FunctionCall; |
| import org.apache.drill.common.expression.FunctionHolderExpression; |
| import org.apache.drill.common.expression.IfExpression; |
| import org.apache.drill.common.expression.LogicalExpression; |
| import org.apache.drill.common.expression.NullExpression; |
| import org.apache.drill.common.expression.SchemaPath; |
| import org.apache.drill.common.expression.TypedFieldExpr; |
| import org.apache.drill.common.expression.TypedNullConstant; |
| import org.apache.drill.common.expression.ValueExpressions.BooleanExpression; |
| import org.apache.drill.common.expression.ValueExpressions.DateExpression; |
| import org.apache.drill.common.expression.ValueExpressions.Decimal18Expression; |
| import org.apache.drill.common.expression.ValueExpressions.Decimal28Expression; |
| import org.apache.drill.common.expression.ValueExpressions.Decimal38Expression; |
| import org.apache.drill.common.expression.ValueExpressions.Decimal9Expression; |
| import org.apache.drill.common.expression.ValueExpressions.DoubleExpression; |
| import org.apache.drill.common.expression.ValueExpressions.FloatExpression; |
| import org.apache.drill.common.expression.ValueExpressions.IntExpression; |
| import org.apache.drill.common.expression.ValueExpressions.IntervalDayExpression; |
| import org.apache.drill.common.expression.ValueExpressions.IntervalYearExpression; |
| import org.apache.drill.common.expression.ValueExpressions.LongExpression; |
| import org.apache.drill.common.expression.ValueExpressions.ParameterExpression; |
| import org.apache.drill.common.expression.ValueExpressions.QuotedString; |
| import org.apache.drill.common.expression.ValueExpressions.TimeExpression; |
| import org.apache.drill.common.expression.ValueExpressions.TimeStampExpression; |
| import org.apache.drill.common.expression.ValueExpressions.VarDecimalExpression; |
| |
| public abstract class AbstractExprVisitor<T, VAL, EXCEP extends Exception> implements ExprVisitor<T, VAL, EXCEP> { |
| |
| @Override |
| public T visitFunctionCall(FunctionCall call, VAL value) throws EXCEP { |
| return visitUnknown(call, value); |
| } |
| |
| @Override |
| public T visitFunctionHolderExpression(FunctionHolderExpression holder, VAL value) throws EXCEP { |
| return visitUnknown(holder, value); |
| } |
| |
| @Override |
| public T visitIfExpression(IfExpression ifExpr, VAL value) throws EXCEP { |
| return visitUnknown(ifExpr, value); |
| } |
| |
| @Override |
| public T visitBooleanOperator(BooleanOperator op, VAL value) throws EXCEP { |
| return visitUnknown(op, value); |
| } |
| |
| @Override |
| public T visitSchemaPath(SchemaPath path, VAL value) throws EXCEP { |
| return visitUnknown(path, value); |
| } |
| |
| @Override |
| public T visitFloatConstant(FloatExpression fExpr, VAL value) throws EXCEP { |
| return visitUnknown(fExpr, value); |
| } |
| |
| @Override |
| public T visitIntConstant(IntExpression intExpr, VAL value) throws EXCEP { |
| return visitUnknown(intExpr, value); |
| } |
| |
| @Override |
| public T visitLongConstant(LongExpression intExpr, VAL value) throws EXCEP { |
| return visitUnknown(intExpr, value); |
| } |
| |
| @Override |
| public T visitDecimal9Constant(Decimal9Expression decExpr, VAL value) throws EXCEP { |
| return visitUnknown(decExpr, value); |
| } |
| |
| @Override |
| public T visitDecimal18Constant(Decimal18Expression decExpr, VAL value) throws EXCEP { |
| return visitUnknown(decExpr, value); |
| } |
| |
| @Override |
| public T visitDecimal28Constant(Decimal28Expression decExpr, VAL value) throws EXCEP { |
| return visitUnknown(decExpr, value); |
| } |
| |
| @Override |
| public T visitDecimal38Constant(Decimal38Expression decExpr, VAL value) throws EXCEP { |
| return visitUnknown(decExpr, value); |
| } |
| |
| @Override |
| public T visitVarDecimalConstant(VarDecimalExpression decExpr, VAL value) throws EXCEP { |
| return visitUnknown(decExpr, value); |
| } |
| |
| @Override |
| public T visitDateConstant(DateExpression intExpr, VAL value) throws EXCEP { |
| return visitUnknown(intExpr, value); |
| } |
| |
| @Override |
| public T visitTimeConstant(TimeExpression intExpr, VAL value) throws EXCEP { |
| return visitUnknown(intExpr, value); |
| } |
| |
| @Override |
| public T visitTimeStampConstant(TimeStampExpression intExpr, VAL value) throws EXCEP { |
| return visitUnknown(intExpr, value); |
| } |
| |
| @Override |
| public T visitIntervalYearConstant(IntervalYearExpression intExpr, VAL value) throws EXCEP { |
| return visitUnknown(intExpr, value); |
| } |
| |
| @Override |
| public T visitIntervalDayConstant(IntervalDayExpression intExpr, VAL value) throws EXCEP { |
| return visitUnknown(intExpr, value); |
| } |
| |
| @Override |
| public T visitDoubleConstant(DoubleExpression dExpr, VAL value) throws EXCEP { |
| return visitUnknown(dExpr, value); |
| } |
| |
| @Override |
| public T visitBooleanConstant(BooleanExpression e, VAL value) throws EXCEP { |
| return visitUnknown(e, value); |
| } |
| |
| @Override |
| public T visitQuotedStringConstant(QuotedString e, VAL value) throws EXCEP { |
| return visitUnknown(e, value); |
| } |
| |
| @Override |
| public T visitCastExpression(CastExpression e, VAL value) throws EXCEP { |
| return visitUnknown(e, value); |
| } |
| |
| @Override |
| public T visitConvertExpression(ConvertExpression e, VAL value) throws EXCEP { |
| return visitUnknown(e, value); |
| } |
| |
| @Override |
| public T visitAnyValueExpression(AnyValueExpression e, VAL value) throws EXCEP { |
| return visitUnknown(e, value); |
| } |
| |
| @Override |
| public T visitNullConstant(TypedNullConstant e, VAL value) throws EXCEP { |
| return visitUnknown(e, value); |
| } |
| |
| @Override |
| public T visitNullExpression(NullExpression e, VAL value) throws EXCEP { |
| return visitUnknown(e, value); |
| } |
| |
| /** |
| * Handles implementation-specific expressions not known to the visitor |
| * structure. Since there are no "visitFoo" methods for these "unknown" |
| * expressions, subclassses should use the functionally-equivalent |
| * <code>instanceof</code> approach to parse out these "unknown" |
| * expressions. |
| */ |
| @Override |
| public T visitUnknown(LogicalExpression e, VAL value) throws EXCEP { |
| throw new UnsupportedOperationException(String.format( |
| "Expression of type %s not handled by visitor type %s.", |
| e.getClass().getCanonicalName(), this.getClass().getCanonicalName())); |
| } |
| |
| @Override |
| public T visitParameter(ParameterExpression e, VAL value) throws EXCEP { |
| return visitUnknown(e, value); |
| } |
| |
| @Override |
| public T visitTypedFieldExpr(TypedFieldExpr e, VAL value) throws EXCEP { |
| return visitUnknown(e, value); |
| } |
| } |