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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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
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package org.apache.cayenne.access;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.List;
import org.apache.cayenne.query.Query;
import org.apache.cayenne.query.SQLAction;
/**
* A helper that executes a sequence of queries, providing correct mapping of the results
* to the original query. Note that this class is not thread-safe as it stores current
* query execution state.
*
* @since 1.2
*/
class DataNodeQueryAction {
OperationObserver observer;
DataNode node;
public DataNodeQueryAction(DataNode node, OperationObserver observer) {
this.observer = observer;
this.node = node;
}
public void runQuery(Connection connection, final Query originalQuery)
throws SQLException, Exception {
// wrap to ensure that the result is mapped back to the original query, even if
// the underlying SQLAction uses query substitute...
OperationObserver wrapper = new OperationObserver() {
public void nextBatchCount(Query query, int[] resultCount) {
observer.nextBatchCount(originalQuery, resultCount);
}
public void nextCount(Query query, int resultCount) {
observer.nextCount(originalQuery, resultCount);
}
public void nextRows(Query query, List<?> dataRows) {
observer.nextRows(originalQuery, dataRows);
}
public void nextRows(Query q, ResultIterator it) {
observer.nextRows(originalQuery, it);
}
public void nextGeneratedRows(Query query, ResultIterator keysIterator) {
observer.nextGeneratedRows(originalQuery, keysIterator);
}
public void nextGlobalException(Exception ex) {
observer.nextGlobalException(ex);
}
public void nextQueryException(Query query, Exception ex) {
observer.nextQueryException(originalQuery, ex);
}
public boolean isIteratedResult() {
return observer.isIteratedResult();
}
};
SQLAction action = node.getAdapter().getAction(originalQuery, node);
action.performAction(connection, wrapper);
}
}