/**
* Copyright (C) 2009-2013 FoundationDB, LLC
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.foundationdb.sql.optimizer;
import com.foundationdb.sql.StandardException;
import com.foundationdb.sql.parser.ColumnReference;
import com.foundationdb.sql.parser.FromTable;
import com.foundationdb.sql.parser.SQLParser;
import com.foundationdb.sql.parser.SQLParserContext;
import com.foundationdb.sql.parser.StatementNode;
import com.foundationdb.sql.parser.Visitable;
import com.foundationdb.sql.parser.Visitor;
import com.foundationdb.sql.views.ViewDefinition;
import com.foundationdb.ais.model.Column;
import com.foundationdb.ais.model.Columnar;
import com.foundationdb.ais.model.TableName;
import com.foundationdb.server.error.SQLParserInternalException;
import java.util.*;
public class AISViewDefinition extends ViewDefinition
{
private Map<TableName,Collection<String>> tableColumnReferences;
public AISViewDefinition(String sql, SQLParser parser)
throws StandardException {
super(sql, parser);
}
public AISViewDefinition(StatementNode parsed, SQLParserContext parserContext)
throws StandardException {
super(parsed, parserContext);
}
public Map<TableName,Collection<String>> getTableColumnReferences() {
if (tableColumnReferences == null) {
ReferenceCollector collector = new ReferenceCollector();
try {
getSubquery().accept(collector);
}
catch (StandardException ex) {
throw new SQLParserInternalException(ex);
}
tableColumnReferences = collector.references;
}
return tableColumnReferences;
}
static class ReferenceCollector implements Visitor {
Map<TableName,Collection<String>> references = new HashMap<>();
@Override
public Visitable visit(Visitable node) throws StandardException {
if (node instanceof FromTable) {
TableBinding tableBinding = (TableBinding)((FromTable)node).getUserData();
if (tableBinding != null) {
Columnar table = tableBinding.getTable();
if (!references.containsKey(table.getName())) {
references.put(table.getName(), new HashSet<String>());
}
}
}
else if (node instanceof ColumnReference) {
ColumnBinding columnBinding = (ColumnBinding)((ColumnReference)node).getUserData();
if (columnBinding != null) {
Column column = columnBinding.getColumn();
if (column != null) {
Columnar table = column.getColumnar();
Collection<String> entry = references.get(table.getName());
if (entry == null) {
entry = new HashSet<>();
references.put(table.getName(), entry);
}
entry.add(column.getName());
}
}
}
return node;
}
@Override
public boolean visitChildrenFirst(Visitable node) {
return true;
}
@Override
public boolean stopTraversal() {
return false;
}
@Override
public boolean skipChildren(Visitable node) throws StandardException {
return false;
}
}
}