RowMapParser.java

/***************************************************************************
   Copyright 2014 Emily Estes

   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 net.metanotion.sql;


import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.util.HashMap;
import java.util.Map;

import net.metanotion.util.types.Parser;

/** Parse a result set row into an instance of {@link java.util.Map} using the metadata to extract column names. */
public final class RowMapParser implements Parser<Map> {
	public static final RowMapParser INSTANCE = new RowMapParser();

	@Override public Map<String,Object> parse(final Object o) throws Exception {
		final ResultSet rs = (ResultSet) o;
		final ResultSetMetaData rsmd = rs.getMetaData();
		final int numCols = rsmd.getColumnCount();
		final HashMap<String,Object> row = new HashMap<>();
		for(int i=1; i <= numCols; i++) {
			row.put(rsmd.getColumnLabel(i), rs.getObject(i));
		}
		return row;
	}

	@Override public Class<Map> outputInterface() { return Map.class; }
}