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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.planner.sql.parser;
import java.util.Collections;
import java.util.List;
import org.apache.drill.shaded.guava.com.google.common.base.Function;
import org.apache.calcite.sql.SqlBasicCall;
import org.apache.calcite.sql.SqlIdentifier;
import org.apache.calcite.sql.SqlLiteral;
import org.apache.calcite.sql.SqlNode;
import org.apache.calcite.sql.fun.SqlStdOperatorTable;
import org.apache.calcite.sql.parser.SqlParserPos;
import org.apache.drill.shaded.guava.com.google.common.collect.ImmutableList;
import org.apache.drill.shaded.guava.com.google.common.collect.Lists;
public class DrillCompoundIdentifier extends SqlIdentifier {
private static final Function<String, String> STAR_TO_EMPTY = new Function<String, String>() {
public String apply(String s) {
return s.equals("*") ? "" : s;
}
};
private final List<IdentifierHolder> ids;
private static List<String> getNames(List<IdentifierHolder> identifiers) {
List<String> names = Lists.newArrayListWithCapacity(identifiers.size());
for (IdentifierHolder h : identifiers) {
names.add(h.value);
}
return names;
}
public DrillCompoundIdentifier(List<IdentifierHolder> identifiers) {
super(getNames(identifiers), identifiers.get(0).parserPos);
this.ids = identifiers;
}
public static Builder newBuilder() {
return new Builder();
}
public static class Builder {
private List<IdentifierHolder> identifiers = Lists.newArrayList();
public DrillCompoundIdentifier build() {
return new DrillCompoundIdentifier(identifiers);
}
public void addString(String name, SqlParserPos pos) {
identifiers.add(new IdentifierHolder(name, pos, false));
}
public void addIndex(int index, SqlParserPos pos) {
identifiers.add(new IdentifierHolder(Integer.toString(index), pos, true));
}
}
public SqlNode getAsSqlNode() {
if (ids.size() == 1) {
return new SqlIdentifier(Collections.singletonList(ids.get(0).value), ids.get(0).parserPos);
}
int startIndex;
SqlNode node;
if (ids.get(1).isArray()) {
// handle everything post zero index as item operator.
startIndex = 1;
node = new SqlIdentifier(
ImmutableList.of(ids.get(0).value),
null,
ids.get(0).parserPos,
ImmutableList.of(ids.get(0).parserPos));
} else {
// handle everything post two index as item operator.
startIndex = 2;
node = new SqlIdentifier(
// Replaces star by empty string. See SqlIdentifier#isStar()
ImmutableList.of(ids.get(0).value, STAR_TO_EMPTY.apply(ids.get(1).value)), null,
ids.get(0).parserPos,
ImmutableList.of(ids.get(0).parserPos, ids.get(1).parserPos));
}
for (int i = startIndex; i < ids.size(); i++) {
node = ids.get(i).getNode(node);
}
return node;
}
public SqlNode getAsCompoundIdentifier() {
List<String> names = Lists.newArrayListWithCapacity(ids.size());
List<SqlParserPos> pos = Lists.newArrayListWithCapacity(ids.size());
for (IdentifierHolder holder : ids) {
names.add(holder.value);
pos.add(holder.parserPos);
}
return new SqlIdentifier(names, null, pos.get(0), pos);
}
private static class IdentifierHolder {
String value;
SqlParserPos parserPos;
boolean isArray;
public IdentifierHolder(String value, SqlParserPos parserPos, boolean isArray) {
super();
this.isArray = isArray;
this.value = value;
this.parserPos = parserPos;
}
public boolean isArray() {
return isArray;
}
public SqlNode getNode(SqlNode node) {
SqlLiteral literal;
if (isArray) {
literal = SqlLiteral.createExactNumeric(value, parserPos);
} else {
literal = SqlLiteral.createCharString(value, parserPos);
}
return new SqlBasicCall(SqlStdOperatorTable.ITEM, new SqlNode[]{node, literal}, parserPos);
}
}
}
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