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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
* under the License.
*/
package org.apache.tuscany.das.rdb.impl;
import java.sql.SQLException;
import java.util.List;
import org.apache.tuscany.das.rdb.config.wrapper.MappingWrapper;
import org.apache.tuscany.das.rdb.graphbuilder.impl.GraphBuilderMetadata;
import org.apache.tuscany.das.rdb.graphbuilder.impl.ResultSetProcessor;
import org.apache.tuscany.sdo.util.SDOUtil;
import commonj.sdo.ChangeSummary;
import commonj.sdo.DataGraph;
import commonj.sdo.DataObject;
public class ReadCommandImpl extends CommandImpl {
private int startRow = 1;
private int endRow = Integer.MAX_VALUE;
public ReadCommandImpl(String sqlString, MappingWrapper mapping, List resultDescriptor) {
super(sqlString);
this.configWrapper = mapping;
if (resultDescriptor != null && !resultDescriptor.isEmpty()) {
this.resultSetShape = new ResultSetShape(resultDescriptor, configWrapper.getConfig());//JIRA-952
}
}
public void execute() {
throw new UnsupportedOperationException();
}
public DataObject executeQuery() {
if (statement.getConnection() == null) {
throw new RuntimeException("A DASConnection object must be specified before executing the query.");
}
boolean success = false;
try {
List results = statement.executeQuery(parameters);
success = true;
return buildGraph(results);
} catch (SQLException e) {
throw new RuntimeException(e);
} finally {
if (success) {
statement.getConnection().cleanUp();
} else {
statement.getConnection().errorCleanUp();
}
}
}
protected DataObject buildGraph(List results) throws SQLException {
// Before we use the mappingModel, do some checking/updating. If
// inferrable information
// isn't specified, add it in.
GraphBuilderMetadata gbmd = new GraphBuilderMetadata(results, configWrapper.getConfig(),
resultSetShape);
// Create the DataGraph
DataGraph g = SDOUtil.createDataGraph();
// Create the root object
g.createRootObject(gbmd.getRootType());
SDOUtil.registerDataGraphTypes(g, gbmd.getDefinedTypes());
ChangeSummary summary = g.getChangeSummary();
ResultSetProcessor rsp = new ResultSetProcessor(g.getRootObject(), gbmd);
rsp.processResults(getStartRow(), getEndRow());
summary.beginLogging();
return g.getRootObject();
}
protected int getStartRow() {
return startRow;
}
protected int getEndRow() {
return endRow;
}
protected void setStartRow(int startRow) {
this.startRow = startRow;
}
protected void setEndRow(int endRow) {
this.endRow = endRow;
}
protected void enablePaging() {
statement.enablePaging();
}
}
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