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/**
*
* Copyright 2005 The Apache Software Foundation or its licensors, as applicable.
*
* 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 org.apache.tuscany.das.rdb;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import org.apache.tuscany.das.rdb.graphbuilder.impl.DefaultConverter;
import org.apache.tuscany.das.rdb.graphbuilder.schema.ResultSetTypeMap;
import commonj.sdo.Type;
/**
* 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.
*
* TODO - This is very preliminary. We need to go over this again and consider making is as close as possible to
* to the infromation returned from ResultSetMetadata. For example, we may want to use JDBC types
* here rather than SDODataTypes. Also, ResultSetMetadata doe not provide converters, so, maybe this
* interface should also not.
*
*
*/
public class ResultSetShape {
private final String[] columns;
private final String[] tables;
private final Type[] types;
//TODO - Are converters really needed here?
private Converter[] converters;
public ResultSetShape(String[] t, String[] c, Type[] dataTypes) {
this.columns = c;
this.tables = t;
this.types = dataTypes;
this.converters = new DefaultConverter[c.length];
}
public ResultSetShape(ResultSetMetaData metadata) throws SQLException {
columns = new String[metadata.getColumnCount()];
tables = new String[metadata.getColumnCount()];
types = new Type[metadata.getColumnCount()];
converters = new DefaultConverter[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 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 void setConverter(int i, Converter converter) {
this.converters[i] = converter;
}
public Converter getConverter(int i) {
return this.converters[i-1];
}
public void setConverterFactory(Converter converter) {
for ( int i=0; i < getColumnCount(); i++ ) {
this.converters[i] = converter;
}
}
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('\t');
result.append(converters[i]);
result.append('\n');
}
return result.toString();
}
}
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