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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.UnionQuery;
-
-
- /**
- * Concrete Query subclass which represents a UNION query, e.g.:
- * {@code SELECT <query1> UNION SELECT <query2>}
- *
- * @author James Ahlborn
- */
- public class UnionQueryImpl extends QueryImpl implements UnionQuery
- {
- public UnionQueryImpl(String name, List<Row> rows, int objectId,
- int objectFlag) {
- super(name, rows, objectId, objectFlag, Type.UNION);
- }
-
- @Override
- public String getUnionType() {
- return(hasFlag(UNION_FLAG) ? DEFAULT_TYPE : "ALL");
- }
-
- @Override
- public String getUnionString1() {
- return getUnionString(UNION_PART1);
- }
-
- @Override
- public String getUnionString2() {
- return getUnionString(UNION_PART2);
- }
-
- @Override
- public List<String> getOrderings() {
- return super.getOrderings();
- }
-
- private String getUnionString(String id) {
- for(Row row : getTableRows()) {
- if(id.equals(row.name2)) {
- return cleanUnionString(row.expression);
- }
- }
- throw new IllegalStateException(
- "Could not find union query with id " + id);
- }
-
- @Override
- protected void toSQLString(StringBuilder builder)
- {
- builder.append(getUnionString1()).append(NEWLINE)
- .append("UNION ");
- String unionType = getUnionType();
- if(!DEFAULT_TYPE.equals(unionType)) {
- builder.append(unionType).append(' ');
- }
- builder.append(getUnionString2());
- List<String> orderings = getOrderings();
- if(!orderings.isEmpty()) {
- builder.append(NEWLINE).append("ORDER BY ").append(orderings);
- }
- }
-
- private static String cleanUnionString(String str)
- {
- return str.trim().replaceAll("[\r\n]+", NEWLINE);
- }
-
- }
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