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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.sql;
import com.hazelcast.org.apache.calcite.sql.parser.SqlParserPos;
import com.hazelcast.org.apache.calcite.sql.validate.SqlValidator;
import com.hazelcast.org.apache.calcite.sql.validate.SqlValidatorScope;
import com.hazelcast.org.apache.calcite.util.ImmutableNullableList;
import java.util.List;
import java.util.Objects;
import javax.annotation.Nonnull;
/**
* A SqlSelect is a node of a parse tree which represents a select
* statement. It warrants its own node type just because we have a lot of
* methods to put somewhere.
*/
public class SqlSelect extends SqlCall {
//~ Static fields/initializers ---------------------------------------------
// constants representing operand positions
public static final int FROM_OPERAND = 2;
public static final int WHERE_OPERAND = 3;
public static final int HAVING_OPERAND = 5;
SqlNodeList keywordList;
SqlNodeList selectList;
SqlNode from;
SqlNode where;
SqlNodeList groupBy;
SqlNode having;
SqlNodeList windowDecls;
SqlNodeList orderBy;
SqlNode offset;
SqlNode fetch;
SqlNodeList hints;
//~ Constructors -----------------------------------------------------------
public SqlSelect(SqlParserPos pos,
SqlNodeList keywordList,
SqlNodeList selectList,
SqlNode from,
SqlNode where,
SqlNodeList groupBy,
SqlNode having,
SqlNodeList windowDecls,
SqlNodeList orderBy,
SqlNode offset,
SqlNode fetch,
SqlNodeList hints) {
super(pos);
this.keywordList = Objects.requireNonNull(keywordList != null
? keywordList : new SqlNodeList(pos));
this.selectList = selectList;
this.from = from;
this.where = where;
this.groupBy = groupBy;
this.having = having;
this.windowDecls = Objects.requireNonNull(windowDecls != null
? windowDecls : new SqlNodeList(pos));
this.orderBy = orderBy;
this.offset = offset;
this.fetch = fetch;
this.hints = hints;
}
//~ Methods ----------------------------------------------------------------
public SqlOperator getOperator() {
return SqlSelectOperator.INSTANCE;
}
@Override public SqlKind getKind() {
return SqlKind.SELECT;
}
@Override public List getOperandList() {
return ImmutableNullableList.of(keywordList, selectList, from, where,
groupBy, having, windowDecls, orderBy, offset, fetch, hints);
}
@Override public void setOperand(int i, SqlNode operand) {
switch (i) {
case 0:
keywordList = Objects.requireNonNull((SqlNodeList) operand);
break;
case 1:
selectList = (SqlNodeList) operand;
break;
case 2:
from = operand;
break;
case 3:
where = operand;
break;
case 4:
groupBy = (SqlNodeList) operand;
break;
case 5:
having = operand;
break;
case 6:
windowDecls = Objects.requireNonNull((SqlNodeList) operand);
break;
case 7:
orderBy = (SqlNodeList) operand;
break;
case 8:
offset = operand;
break;
case 9:
fetch = operand;
break;
default:
throw new AssertionError(i);
}
}
public final boolean isDistinct() {
return getModifierNode(SqlSelectKeyword.DISTINCT) != null;
}
public final SqlNode getModifierNode(SqlSelectKeyword modifier) {
for (SqlNode keyword : keywordList) {
SqlSelectKeyword keyword2 =
((SqlLiteral) keyword).symbolValue(SqlSelectKeyword.class);
if (keyword2 == modifier) {
return keyword;
}
}
return null;
}
public final SqlNode getFrom() {
return from;
}
public void setFrom(SqlNode from) {
this.from = from;
}
public final SqlNodeList getGroup() {
return groupBy;
}
public void setGroupBy(SqlNodeList groupBy) {
this.groupBy = groupBy;
}
public final SqlNode getHaving() {
return having;
}
public void setHaving(SqlNode having) {
this.having = having;
}
public final SqlNodeList getSelectList() {
return selectList;
}
public void setSelectList(SqlNodeList selectList) {
this.selectList = selectList;
}
public final SqlNode getWhere() {
return where;
}
public void setWhere(SqlNode whereClause) {
this.where = whereClause;
}
@Nonnull public final SqlNodeList getWindowList() {
return windowDecls;
}
public final SqlNodeList getOrderList() {
return orderBy;
}
public void setOrderBy(SqlNodeList orderBy) {
this.orderBy = orderBy;
}
public final SqlNode getOffset() {
return offset;
}
public void setOffset(SqlNode offset) {
this.offset = offset;
}
public final SqlNode getFetch() {
return fetch;
}
public void setFetch(SqlNode fetch) {
this.fetch = fetch;
}
public void setHints(SqlNodeList hints) {
this.hints = hints;
}
public SqlNodeList getHints() {
return this.hints;
}
public boolean hasHints() {
// The hints may be passed as null explicitly.
return this.hints != null && this.hints.size() > 0;
}
public void validate(SqlValidator validator, SqlValidatorScope scope) {
validator.validateQuery(this, scope, validator.getUnknownType());
}
// Override SqlCall, to introduce a sub-query frame.
@Override public void unparse(SqlWriter writer, int leftPrec, int rightPrec) {
if (!writer.inQuery()) {
// If this SELECT is the topmost item in a sub-query, introduce a new
// frame. (The topmost item in the sub-query might be a UNION or
// ORDER. In this case, we don't need a wrapper frame.)
final SqlWriter.Frame frame =
writer.startList(SqlWriter.FrameTypeEnum.SUB_QUERY, "(", ")");
writer.getDialect().unparseCall(writer, this, 0, 0);
writer.endList(frame);
} else {
writer.getDialect().unparseCall(writer, this, leftPrec, rightPrec);
}
}
public boolean hasOrderBy() {
return orderBy != null && orderBy.size() != 0;
}
public boolean hasWhere() {
return where != null;
}
public boolean isKeywordPresent(SqlSelectKeyword targetKeyWord) {
return getModifierNode(targetKeyWord) != null;
}
}
