org.postgresql.adba.communication.network.DescribeResponse Maven / Gradle / Ivy

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package org.postgresql.adba.communication.network;

import org.postgresql.adba.communication.BeFrame;
import org.postgresql.adba.communication.NetworkReadContext;
import org.postgresql.adba.communication.NetworkResponse;
import org.postgresql.adba.communication.packets.RowDescription;

import java.io.IOException;

/**
 * Describe {@link NetworkResponse}.
 * 
 * @author Daniel Sagenschneider
 */
public class DescribeResponse extends AbstractPortalResponse {

  public DescribeResponse(Portal portal) {
    super(portal);
  }

  @Override
  public NetworkResponse read(NetworkReadContext context) throws IOException {
    BeFrame frame = context.getBeFrame();
    switch (frame.getTag()) {

      case NO_DATA:
        return null;

      case PARAM_DESCRIPTION:
        return this; // wait on row description

      case ROW_DESCRIPTION:
        RowDescription rowDescription = new RowDescription(frame.getPayload());
        portal.getQuery().setRowDescription(rowDescription);
        return null; // nothing further

      default:
        throw new IllegalStateException("Invalid tag '" + frame.getTag() + "' for " + this.getClass().getSimpleName());
    }
  }

}