/* RmicCompiler.java -- RMI stub generator for java.rmi.*
   Copyright (C) 2006 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath 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, or (at your option)
any later version.

GNU Classpath 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
General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module.  An independent module is a module which is not derived from
or based on this library.  If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so.  If you do not wish to do so, delete this
exception statement from your version. */


package gnu.classpath.tools.rmi.rmic;

import java.lang.reflect.Method;
import java.util.Iterator;

import gnu.classpath.tools.AbstractMethodGenerator;
import gnu.classpath.tools.giop.grmic.GiopRmicCompiler;

/**
 * RMI stub source code generator, required to support java.rmi.*
 *
 * @author Audrius Meskauskas (AudriusA@Bioinformatics.org) 
 */
public class RmicCompiler extends GiopRmicCompiler
{
  /**
   * If true, the zero size object array is declared in the stub to reduce
   * garbage generation.
   */
  public boolean addZeroSizeObjecArray;
  
  /**
   * Generate a RMI stub.
   * 
   * @return the string, containing the text of the generated stub.
   */
  public String generateStub()
  {
    String template = getResource("Stub_12.jav");

    // Generate methods.
    StringBuffer b = new StringBuffer();
    Iterator iter = methods.iterator();
    while (iter.hasNext())
      {
        RmiMethodGenerator m = (RmiMethodGenerator) iter.next();
        b.append(m.generateStubMethod());
      }

    vars.put("#stub_methods", b.toString());
    vars.put("#imports", getImportStatements());
    vars.put("#interfaces", getAllInterfaces());
    vars.put("#stub_method_declarations", getStubMethodDeclarations());
    vars.put("#stub_method_initializations", getStubMethodInitializations());
    if (addZeroSizeObjecArray)
      {
        vars.put("#zeroSizeObjecArray",
               "private static final Object[] NO_ARGS = new Object[0];");
        vars.put("#zeroSizeClassArray",
               "final Class[]  NO_ARGSc = new Class[0];");
      }
    else
      {
        vars.put("#zeroSizeObjecArray","");
        vars.put("#zeroSizeClassArray","");        
      }

    String output = replaceAll(template, vars);
    return output;
  }

  /**
   * Create a method generator, applicable for RMI stub methods.
   */
  protected AbstractMethodGenerator createMethodGenerator(Method m)
  {
    return new RmiMethodGenerator(m, this);
  } 
  
  /**
   * Get the stub method declarations.
   */
  public String getStubMethodDeclarations()
  {
    StringBuffer b = new StringBuffer();
    
    Iterator iter = methods.iterator();
     
    while (iter.hasNext())
      {
        RmiMethodGenerator method = (RmiMethodGenerator) iter.next();
        b.append("    ");
        b.append("private static final Method met_");
        b.append(method.method.getName());
        b.append(';');
        if (iter.hasNext())
          b.append('\n');
      }
    return b.toString();
  }
  
  /**
   * Get stub method initializations. These must be done in a try-catch
   * statement to catch {@link NoSuchMethodException}.
   */
  public String getStubMethodInitializations()
  {
    StringBuffer b = new StringBuffer();
    
    Iterator iter = methods.iterator();
     
    while (iter.hasNext())
      {
        RmiMethodGenerator method = (RmiMethodGenerator) iter.next();
        b.append("             ");
        b.append("met_");
        b.append(method.method.getName());
        b.append(" =\n               ");
        b.append(name(method.method.getDeclaringClass()));
        b.append(".class.getMethod(");
        b.append('"');
        b.append(method.method.getName());
        b.append("\", ");        
        if (method.method.getParameterTypes().length == 0)
          b.append("NO_ARGSc);");
        else
          {
            b.append("new Class[]\n                 {\n                   ");
            b.append(method.getArgListAsClassArray());
            b.append("\n                 }");
            b.append(");");
          }
        b.append('\n');
      }
    return b.toString();
  }

  /**
   * Prepare for the compilation of the next class.
   */
  public void reset()
  {
    addZeroSizeObjecArray = false;
    super.reset();
  }

  /**
   * Additional processing of the stub name (nothing to do for JRMP stubs).
   */
  public String convertStubName(String name)
  {
    return name;
  }  
}
