/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2006, Red Hat Middleware LLC, and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.jboss.ejb.plugins.cmp.jdbc.metadata;

import java.lang.reflect.Method;

import org.jboss.deployment.DeploymentException;

/**
 * Immutable class which contains information about an DynamicQL query.
 *
 * @author <a href="mailto:dain@daingroup.com">Dain Sundstrom</a>
 * @version $Revision: 57209 $
 */
public final class JDBCDynamicQLQueryMetaData implements JDBCQueryMetaData
{
   /**
    * The method to which this query is bound.
    */
   private final Method method;

   /**
    * Should the query return Local or Remote beans.
    */
   private final boolean resultTypeMappingLocal;

   private final JDBCReadAheadMetaData readAhead;

   private final Class compiler;

   private final boolean lazyResultSetLoading;

   /**
    * Constructs a JDBCDynamicQLQueryMetaData with DynamicQL declared in the
    * jboss-ql elemnt and is invoked by the specified method.
    *
    * @param defaults the metadata about this query
    */
   public JDBCDynamicQLQueryMetaData(JDBCDynamicQLQueryMetaData defaults,
                                     JDBCReadAheadMetaData readAhead,
                                     Class qlCompiler,
                                     boolean lazyResultSetLoading)
      throws DeploymentException
   {
      this.method = defaults.getMethod();
      this.readAhead = readAhead;
      this.resultTypeMappingLocal = defaults.isResultTypeMappingLocal();
      compiler = qlCompiler;
      this.lazyResultSetLoading = lazyResultSetLoading;
   }


   /**
    * Constructs a JDBCDynamicQLQueryMetaData with DynamicQL declared in the
    * jboss-ql elemnt and is invoked by the specified method.
    */
   public JDBCDynamicQLQueryMetaData(boolean resultTypeMappingLocal,
                                     Method method,
                                     JDBCReadAheadMetaData readAhead,
                                     Class compiler,
                                     boolean lazyResultSetLoading)
      throws DeploymentException
   {

      this.method = method;
      this.readAhead = readAhead;
      this.resultTypeMappingLocal = resultTypeMappingLocal;

      Class[] parameterTypes = method.getParameterTypes();
      if(parameterTypes.length != 2
         ||
         !parameterTypes[0].equals(String.class) ||
         !parameterTypes[1].equals(Object[].class))
      {
         throw new DeploymentException(
            "Dynamic-ql method must have two " +
            "parameters of type String and Object[]."
         );
      }

      this.compiler = compiler;
      this.lazyResultSetLoading = lazyResultSetLoading;
   }

   // javadoc in parent class
   public Method getMethod()
   {
      return method;
   }

   // javadoc in parent class
   public boolean isResultTypeMappingLocal()
   {
      return resultTypeMappingLocal;
   }

   /**
    * Gets the read ahead metadata for the query.
    *
    * @return the read ahead metadata for the query.
    */
   public JDBCReadAheadMetaData getReadAhead()
   {
      return readAhead;
   }

   public Class getQLCompilerClass()
   {
      return compiler;
   }

   public boolean isLazyResultSetLoading()
   {
      return lazyResultSetLoading;
   }

   /**
    * Compares this JDBCDynamicQLQueryMetaData against the specified object.
    * Returns true if the objects are the same. Two JDBCDynamicQLQueryMetaData
    * are the same if they are both invoked by the same method.
    *
    * @param o the reference object with which to compare
    * @return true if this object is the same as the object argument;
    *         false otherwise
    */
   public boolean equals(Object o)
   {
      if(o instanceof JDBCDynamicQLQueryMetaData)
      {
         return ((JDBCDynamicQLQueryMetaData) o).method.equals(method);
      }
      return false;
   }

   /**
    * Returns a hashcode for this JDBCDynamicQLQueryMetaData. The hashcode is
    * computed by the method which invokes this query.
    *
    * @return a hash code value for this object
    */
   public int hashCode()
   {
      return method.hashCode();
   }

   /**
    * Returns a string describing this JDBCDynamicQLQueryMetaData. The exact
    * details of the representation are unspecified and subject to change, but
    * the following may be regarded as typical:
    * <p/>
    * "[JDBCDynamicQLQueryMetaData: method=public org.foo.User
    * findByName(java.lang.String)]"
    *
    * @return a string representation of the object
    */
   public String toString()
   {
      return "[JDBCDynamicQLQueryMetaData : method=" + method + "]";
   }
}
