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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.CrossTabQuery;
-
-
- /**
- * Concrete Query subclass which represents a crosstab/pivot query, e.g.:
- * {@code TRANSFORM <expr> SELECT <query> PIVOT <expr>}
- *
- * @author James Ahlborn
- */
- public class CrossTabQueryImpl extends BaseSelectQueryImpl
- implements CrossTabQuery
- {
-
- public CrossTabQueryImpl(String name, List<Row> rows, int objectId,
- int objectFlag) {
- super(name, rows, objectId, objectFlag, Type.CROSS_TAB);
- }
-
- protected Row getTransformRow() {
- return getUniqueRow(
- filterRowsByNotFlag(super.getColumnRows(),
- (short)(CROSSTAB_PIVOT_FLAG |
- CROSSTAB_NORMAL_FLAG)));
- }
-
- @Override
- protected List<Row> getColumnRows() {
- return filterRowsByFlag(super.getColumnRows(), CROSSTAB_NORMAL_FLAG);
- }
-
- @Override
- protected List<Row> getGroupByRows() {
- return filterRowsByFlag(super.getGroupByRows(), CROSSTAB_NORMAL_FLAG);
- }
-
- protected Row getPivotRow() {
- return getUniqueRow(filterRowsByFlag(super.getColumnRows(),
- CROSSTAB_PIVOT_FLAG));
- }
-
- public String getTransformExpression() {
- Row row = getTransformRow();
- if(row.expression == null) {
- return null;
- }
- // note column expression are always quoted appropriately
- StringBuilder builder = new StringBuilder(row.expression);
- return toAlias(builder, row.name1).toString();
- }
-
- public String getPivotExpression() {
- return getPivotRow().expression;
- }
-
- @Override
- protected void toSQLString(StringBuilder builder)
- {
- String transformExpr = getTransformExpression();
- if(transformExpr != null) {
- builder.append("TRANSFORM ").append(transformExpr).append(NEWLINE);
- }
-
- toSQLSelectString(builder, true);
-
- builder.append(NEWLINE).append("PIVOT ")
- .append(getPivotExpression());
- }
-
- }
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