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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 com.hazelcast.org.apache.calcite.rex;

import com.hazelcast.org.apache.calcite.rel.type.RelDataType;

/**
 * Shuttle which creates a deep copy of a Rex expression.
 *
 * 

This is useful when copying objects from one type factory or builder to * another. * * @see RexBuilder#copy(RexNode) */ class RexCopier extends RexShuttle { //~ Instance fields -------------------------------------------------------- private final RexBuilder builder; //~ Constructors ----------------------------------------------------------- /** * Creates a RexCopier. * * @param builder Builder */ RexCopier(RexBuilder builder) { this.builder = builder; } //~ Methods ---------------------------------------------------------------- private RelDataType copy(RelDataType type) { return builder.getTypeFactory().copyType(type); } public RexNode visitOver(RexOver over) { final boolean[] update = null; return new RexOver(copy(over.getType()), over.getAggOperator(), visitList(over.getOperands(), update), visitWindow(over.getWindow()), over.isDistinct(), over.ignoreNulls()); } public RexNode visitCall(final RexCall call) { final boolean[] update = null; return builder.makeCall(copy(call.getType()), call.getOperator(), visitList(call.getOperands(), update)); } public RexNode visitCorrelVariable(RexCorrelVariable variable) { return builder.makeCorrel(copy(variable.getType()), variable.id); } public RexNode visitFieldAccess(RexFieldAccess fieldAccess) { return builder.makeFieldAccess(fieldAccess.getReferenceExpr().accept(this), fieldAccess.getField().getIndex()); } public RexNode visitInputRef(RexInputRef inputRef) { return builder.makeInputRef(copy(inputRef.getType()), inputRef.getIndex()); } public RexNode visitLocalRef(RexLocalRef localRef) { return new RexLocalRef(localRef.getIndex(), copy(localRef.getType())); } public RexNode visitLiteral(RexLiteral literal) { // Get the value as is return new RexLiteral(RexLiteral.value(literal), copy(literal.getType()), literal.getTypeName()); } public RexNode visitDynamicParam(RexDynamicParam dynamicParam) { return builder.makeDynamicParam(copy(dynamicParam.getType()), dynamicParam.getIndex()); } public RexNode visitRangeRef(RexRangeRef rangeRef) { return builder.makeRangeReference(copy(rangeRef.getType()), rangeRef.getOffset(), false); } }





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