/* * 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.uber.athenax.vm.compiler.parser; import org.apache.calcite.sql.SqlNode; import org.apache.calcite.sql.SqlNodeList; import org.apache.calcite.sql.SqlWriter; import java.util.Arrays; class UnparseUtil { private final SqlWriter writer; private final int leftPrec; private final int rightPrec; UnparseUtil(SqlWriter writer, int leftPrec, int rightPrec) { this.writer = writer; this.leftPrec = leftPrec; this.rightPrec = rightPrec; } UnparseUtil keyword(String... keywords) { Arrays.stream(keywords).forEach(writer::keyword); return this; } UnparseUtil node(SqlNode n) { n.unparse(writer, leftPrec, rightPrec); return this; } UnparseUtil nodeList(SqlNodeList l) { writer.keyword("("); if (l.size() > 0) { l.get(0).unparse(writer, leftPrec, rightPrec); for (int i = 1; i < l.size(); ++i) { writer.keyword(","); l.get(i).unparse(writer, leftPrec, rightPrec); } } writer.keyword(")"); return this; } }