/*
 * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Resin Open Source is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *   Free SoftwareFoundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.ejb.gen;

import java.io.IOException;

import java.util.Collection;

import javax.ejb.EJBLocalObject;
import javax.ejb.EJBObject;

import com.caucho.util.L10N;

import com.caucho.bytecode.JClass;
import com.caucho.bytecode.JMethod;

import com.caucho.config.ConfigException;

import com.caucho.java.JavaWriter;

import com.caucho.java.gen.BaseMethod;

import com.caucho.ejb.cfg.EjbEntityBean;

import com.caucho.ejb.ql.EjbSelectQuery;

/**
 * Generates the code for a query
 */
public class AmberQueryMethod extends AbstractQueryMethod {
  private static final L10N L = new L10N(AmberQueryMethod.class);

  private EjbEntityBean _returnType;
  private JMethod _method;
  private String _contextClassName;
  private String _prefix;
  
  public AmberQueryMethod(EjbEntityBean type,
			  JMethod method,
			  String contextClassName,
			  String prefix,
			  EjbSelectQuery query)
    throws ConfigException
  {
    super(type, method, query);

    _returnType = type;
    _method = method;
    _contextClassName = contextClassName;
    _prefix = prefix;
  }

  /**
   * Gets the parameter types
   */
  public JClass []getParameterTypes()
  {
    return _method.getParameterTypes();
  }

  /**
   * Gets the return type.
   */
  public JClass getReturnType()
  {
    return _method.getReturnType();
  }

  /**
   * Prints the create method
   *
   * @param method the create method
   */
  public void generateCall(JavaWriter out, String []args)
    throws IOException
  {
    out.print("com.caucho.ejb.xa.TransactionContext trans");
    out.println(" = _xaManager.beginSupports();");

    out.println("try {");
    out.pushDepth();

    generatePrepareQuery(out, args);

    out.println("com.caucho.amber.query.ResultSetImpl rs = (com.caucho.amber.query.ResultSetImpl) query.executeQuery();");
    out.println("java.util.ArrayList list = new java.util.ArrayList();");

    boolean isCollection = 
      _method.getReturnType().isAssignableTo(Collection.class);

    if (isCollection) {
      out.println("while (rs.next()) {");
      out.pushDepth();

      String beanClass = _returnType.getFullImplName();

      out.println("com.caucho.ejb.entity.EntityObject item = (com.caucho.ejb.entity.EntityObject) rs.getObject(1);");
      if ("RemoteHome".equals(_prefix))
	out.println("list.add(item.getEJBObject());");
      else if ("LocalHome".equals(_prefix))
	out.println("list.add(item);");
      else
	out.println("list.add(item);");
    
      out.popDepth();
      out.println("}");
      out.println("rs.close();");
      out.println();
      out.println("return list;");
    }
    else {
      out.println("if (rs.next()) {");
      out.pushDepth();

      String beanClass = _returnType.getFullImplName();

      out.println("com.caucho.ejb.entity.EntityObject entity = (com.caucho.ejb.entity.EntityObject) rs.getObject(1);");
      out.println("rs.close();");
      out.println();
      
      String retType = getReturnType().getName();

      if ("RemoteHome".equals(_prefix))
	out.println("return (" + retType + ") entity.getEJBObject();");
      else if ("LocalHome".equals(_prefix))
	out.println("return (" + retType + ") entity;");
      else
	throw new IllegalStateException(L.l("'{0}' is an unknown type",
					    _prefix));

      /*
      String retType = getReturnType().getName();

      out.println(retType + " v = (" + retType + ") rs.getObject(1);");
      out.println("rs.close();");

      out.println("return v;");
      
      if (! "LocalHome".equals(_prefix))
	throw new IllegalStateException(L.l("'{0}' is an unknown type",
					    _prefix));
      */
    
      out.popDepth();
      out.println("}");
      out.println();
      out.println("throw new ObjectNotFoundException(\"no matching object found\");");
    }
    
    /*
    Class retType = getReturnType();

    if ("RemoteHome".equals(_prefix))
      out.println("return (" + retType.getName() + ") _server.getContext(" + args[0] + ", true).getEJBObject();");
    else if ("LocalHome".equals(_prefix))
      out.println("return (" + retType.getName() + ") _server.getContext(" + args[0] + ", true).getEJBLocalObject();");
    else
      throw new IllegalStateException(L.l("'{0}' is an unknown type",
					  _prefix));
    */

    out.popDepth();
    out.println("} catch (java.sql.SQLException e) {");
    out.println("  throw new com.caucho.ejb.FinderExceptionWrapper(e);");
    out.println("} finally {");
    out.println("  trans.commit();");
    out.println("}");
  }
}
