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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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