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package edu.caltech.nanodb.commands;
import edu.caltech.nanodb.plannodes.PlanNode;
import edu.caltech.nanodb.queryeval.Planner;
import edu.caltech.nanodb.server.NanoDBServer;
/**
* <p>
* This command object represents a <tt>DUMP TABLE</tt> command issued against
* the database. <tt>DUMP TABLE</tt> commands are pretty simple, having a
* single form: <tt>DUMP TABLE ... [TO FILE ...] [FORMAT ...]</tt>.
* </p>
* <p>
* This command is effectively identical to <tt>SELECT * FROM tbl;</tt> with
* the results being output to console or a data file for analysis. The
* command is particularly helpful when the planner only implements
* {@link Planner#makeSimpleSelect}; no planning is needed for this command
* to work.
* </p>
*/
public class DumpTableCommand extends DumpCommand {
/** The name of the table to dump. */
private String tableName;
/**
* Constructs a new dump-table command.
*
* @param tableName the name of the table to dump
*
* @param fileName the path and file to dump the data to. The console
* will be used if this is @code{null}.
*
* @param format the format to dump the data in
*
* @throws IllegalArgumentException if tableName is null.
*/
public DumpTableCommand(String tableName, String fileName, String format) {
super(fileName, format);
if (tableName == null)
throw new IllegalArgumentException("tableName cannot be null");
this.tableName = tableName;
}
/**
* Get the name of the table to be dumped.
*
* @return the name of the table to dump
*/
public String getTableName() {
return tableName;
}
@Override
protected PlanNode prepareDumpPlan(NanoDBServer server) {
// Create a simple plan for scanning the table.
Planner planner = server.getQueryPlanner();
PlanNode plan = planner.makeSimpleSelect(tableName, null, null);
plan.prepare();
return plan;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("DumpTableCommand[table=");
sb.append(tableName);
if (fileName != null) {
sb.append(", filename=\"");
sb.append(fileName);
sb.append("\"");
}
if (format != null) {
sb.append(", format=");
sb.append(format);
}
sb.append(']');
return sb.toString();
}
}