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/*
Copyright (c) 2008 Health Market Science, Inc.
Licensed 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.healthmarketscience.jackcess.impl.query;
import java.util.List;
import static com.healthmarketscience.jackcess.impl.query.QueryFormat.*;
import com.healthmarketscience.jackcess.query.BaseSelectQuery;
/**
* Base class for queries which represent some form of SELECT statement.
*
* @author James Ahlborn
*/
public abstract class BaseSelectQueryImpl extends QueryImpl
implements BaseSelectQuery
{
protected BaseSelectQueryImpl(String name, List<Row> rows, int objectId,
int objectFlag, Type type) {
super(name, rows, objectId, objectFlag, type);
}
protected void toSQLSelectString(StringBuilder builder,
boolean useSelectPrefix)
{
if(useSelectPrefix) {
builder.append("SELECT ");
String selectType = getSelectType();
if(!DEFAULT_TYPE.equals(selectType)) {
builder.append(selectType).append(' ');
}
}
builder.append(getSelectColumns());
toSelectInto(builder);
List<String> fromTables = getFromTables();
if(!fromTables.isEmpty()) {
builder.append(NEWLINE).append("FROM ").append(fromTables);
toRemoteDb(builder, getFromRemoteDbPath(), getFromRemoteDbType());
}
String whereExpr = getWhereExpression();
if(whereExpr != null) {
builder.append(NEWLINE).append("WHERE ").append(whereExpr);
}
List<String> groupings = getGroupings();
if(!groupings.isEmpty()) {
builder.append(NEWLINE).append("GROUP BY ").append(groupings);
}
String havingExpr = getHavingExpression();
if(havingExpr != null) {
builder.append(NEWLINE).append("HAVING ").append(havingExpr);
}
List<String> orderings = getOrderings();
if(!orderings.isEmpty()) {
builder.append(NEWLINE).append("ORDER BY ").append(orderings);
}
}
@Override
public String getSelectType()
{
if(hasFlag(DISTINCT_SELECT_TYPE)) {
return "DISTINCT";
}
if(hasFlag(DISTINCT_ROW_SELECT_TYPE)) {
return "DISTINCTROW";
}
if(hasFlag(TOP_SELECT_TYPE)) {
StringBuilder builder = new StringBuilder();
builder.append("TOP ").append(getFlagRow().name1);
if(hasFlag(PERCENT_SELECT_TYPE)) {
builder.append(" PERCENT");
}
return builder.toString();
}
return DEFAULT_TYPE;
}
@Override
public List<String> getSelectColumns()
{
List<String> result = (new RowFormatter(getColumnRows()) {
@Override protected void format(StringBuilder builder, Row row) {
// note column expression are always quoted appropriately
builder.append(row.expression);
toAlias(builder, row.name1);
}
}).format();
if(hasFlag(SELECT_STAR_SELECT_TYPE)) {
result.add("*");
}
return result;
}
protected void toSelectInto(StringBuilder builder)
{
// base does nothing
}
@Override
public List<String> getFromTables()
{
return super.getFromTables();
}
@Override
public String getFromRemoteDbPath()
{
return super.getFromRemoteDbPath();
}
@Override
public String getFromRemoteDbType()
{
return super.getFromRemoteDbType();
}
@Override
public String getWhereExpression()
{
return super.getWhereExpression();
}
@Override
public List<String> getGroupings()
{
return (new RowFormatter(getGroupByRows()) {
@Override protected void format(StringBuilder builder, Row row) {
builder.append(row.expression);
}
}).format();
}
@Override
public String getHavingExpression()
{
return getHavingRow().expression;
}
@Override
public List<String> getOrderings()
{
return super.getOrderings();
}
}
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