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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.ResultSetMetaData;
import java.sql.SQLException;
import java.util.List;
import org.apache.tuscany.das.rdb.config.ResultDescriptor;
import org.apache.tuscany.das.rdb.graphbuilder.schema.ResultSetTypeMap;
import commonj.sdo.Type;
import commonj.sdo.helper.TypeHelper;
/**
* Describes the structure of the result set returned from
* execution of a SELECT statement. This description is typcially
* not required since the shape can be retreived from the JDBC
* ResultSetMetadata. However, some platforms such as Oracle do not
* support fully suport ResultSetMedata.
* <p>
* There may also be a performance boost when using this interface.
*
*
*/
public class ResultSetShape {
private final String[] columns;
private final String[] tables;
private final Type[] types;
public ResultSetShape(ResultSetMetaData metadata) throws SQLException {
columns = new String[metadata.getColumnCount()];
tables = new String[metadata.getColumnCount()];
types = new Type[metadata.getColumnCount()];
ResultSetTypeMap typeMap = ResultSetTypeMap.INSTANCE;
for (int i = 1; i <= metadata.getColumnCount(); i++) {
tables[i - 1] = metadata.getTableName(i);
columns[i - 1] = metadata.getColumnName(i);
types[i - 1] = typeMap.getType(metadata.getColumnType(i), true);
}
}
public ResultSetShape(List resultDescriptor) {
TypeHelper helper = TypeHelper.INSTANCE;
int size = resultDescriptor.size();
columns = new String[size];
tables = new String[size];
types = new Type[size];
for (int i = 0; i < size; i++) {
ResultDescriptor desc = (ResultDescriptor) resultDescriptor.get(i);
tables[i] = desc.getTableName();
columns[i] = desc.getColumnName();
int idx = desc.getColumnType().lastIndexOf('.');
String uri = desc.getColumnType().substring(0, idx);
String typeName = desc.getColumnType().substring(idx + 1);
types[i] = helper.getType(uri, typeName);
if (types[i] == null) {
throw new RuntimeException("Could not find type " + desc.getColumnType()
+ " for column " + desc.getColumnName());
}
}
}
public int getColumnCount() {
return columns.length;
}
public String getTableName(int i) {
return tables[i - 1];
}
public String getColumnName(int i) {
return columns[i - 1];
}
public Type getColumnType(int i) {
return types[i - 1];
}
public String toString() {
StringBuffer result = new StringBuffer();
result.append(" column/table/type: ");
for (int i = 0; i < columns.length; i++) {
result.append(columns[i]);
result.append('\t');
result.append(tables[i]);
result.append('\t');
if (types[i] == null) {
result.append("null");
} else {
result.append(types[i].getName());
}
result.append('\n');
}
return result.toString();
}
}
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