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*/

package com.google.refine.model.changes;

import java.io.IOException;
import java.io.LineNumberReader;
import java.io.Writer;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;

import com.google.refine.history.Change;
import com.google.refine.model.ColumnGroup;
import com.google.refine.util.ParsingUtilities;

abstract public class ColumnChange implements Change {
    
    static public void writeOldColumnGroups(Writer writer, Properties options,
            List<ColumnGroup> oldColumnGroups) throws IOException {
        writer.write("oldColumnGroupCount=");
        writer.write(Integer.toString(oldColumnGroups.size())); writer.write('\n');
        for (ColumnGroup cg : oldColumnGroups) {     
            ParsingUtilities.saveWriter.writeValue(writer, cg);
            writer.write('\n');
        }
    }
    
    static public List<ColumnGroup> readOldColumnGroups(
            LineNumberReader reader, int oldColumnGroupCount) throws Exception {
        List<ColumnGroup> oldColumnGroups = new ArrayList<ColumnGroup>(oldColumnGroupCount);
        for (int i = 0; i < oldColumnGroupCount; i++) {
            String line = reader.readLine();
            if (line != null) {
                oldColumnGroups.add(ColumnGroup.load(line));
            }
        }
        return oldColumnGroups;
    }
}
