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* Licensed to the Apache Software Foundation (ASF) under one
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* 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
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* KIND, either express or implied. See the License for the
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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.DataRow;
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
* @author Andrus Adamchik
*/
class DataNodeQueryAction implements OperationObserver {
OperationObserver observer;
DataNode node;
private Query currentQuery;
public DataNodeQueryAction(DataNode node, OperationObserver observer) {
this.observer = observer;
this.node = node;
}
public void runQuery(Connection connection, Query query) throws SQLException,
Exception {
// remember root query ... it will be used to map the results, even if SQLAction
// uses query substitute...
this.currentQuery = query;
SQLAction action = node.getAdapter().getAction(query, node);
action.performAction(connection, this);
}
public void nextBatchCount(Query query, int[] resultCount) {
observer.nextBatchCount(currentQuery, resultCount);
}
public void nextCount(Query query, int resultCount) {
observer.nextCount(currentQuery, resultCount);
}
public void nextDataRows(Query query, List<DataRow> dataRows) {
observer.nextDataRows(currentQuery, dataRows);
}
public void nextDataRows(Query q, ResultIterator it) {
observer.nextDataRows(currentQuery, it);
}
public void nextGeneratedDataRows(Query query, ResultIterator keysIterator) {
observer.nextGeneratedDataRows(currentQuery, keysIterator);
}
public void nextGlobalException(Exception ex) {
observer.nextGlobalException(ex);
}
public void nextQueryException(Query query, Exception ex) {
observer.nextQueryException(currentQuery, ex);
}
public boolean isIteratedResult() {
return observer.isIteratedResult();
}
}