Subversion Repositories openrisc

/* gnu.java.beans.decoder.PropertyContext

   Copyright (C) 2004 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.java.beans.decoder;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

/** PropertyContext is a Context implementation that is very similar to MethodContext

 * and IndexContext. The sole purpose of PropertyContext to find out whether it should

 * 'set' or 'get' a certain property. This decision is made using the number of

 * arguments.

 * <p>When the method call has to be made and there is no argument we 'get' the property.

 * With one argument it is 'set'.</p>

 *

 * @author Robert Schuster

 */

class PropertyContext extends AbstractObjectContext

{

  private Object argument;

  private String propertyName;

  private String prefix = "get";

  private boolean methodCalled;

  PropertyContext(String id, String newPropertyName)

  {

    setId(id);

    propertyName = newPropertyName;

  }

  /* (non-Javadoc)

   * @see gnu.java.beans.decoder.Context#addObject(java.lang.Object)

   */

  public void addParameterObject(Object o) throws AssemblyException

  {

    if (methodCalled)

      throw new AssemblyException(new IllegalArgumentException("Cannot add parameter object when method was already called."));

    if (argument != null)

      throw new AssemblyException(new IllegalArgumentException("Property attribut allows zero or one argument only."));

    argument = o;

        setStatement(true);

    prefix = "set";

  }

  /* (non-Javadoc)

   * @see gnu.java.beans.decoder.Context#endContext(gnu.java.beans.decoder.Context)

   */

  public void notifyStatement(Context outerContext) throws AssemblyException

  {

    if (methodCalled)

      return;

    methodCalled = true;

    Object outerObject = outerContext.getResult();

    if (outerObject == null)

      throw new AssemblyException(new NullPointerException("No object to access property "

          + propertyName));

    // converts property name into a method name

    String methodName = prefix + propertyName.substring(0, 1).toUpperCase()

                        + propertyName.substring(1);

    // prepares the argument

    Object[] args = (argument != null) ? new Object[] { argument } : null;

    try

      {

        Method method = MethodFinder.getMethod(outerObject.getClass(),

                                               methodName, args);

        // stores the result whether it is available or not

        setObject(method.invoke(outerObject, args));

      }

    catch (NoSuchMethodException nsme)

      {

        throw new AssemblyException(nsme);

      }

    catch (InvocationTargetException ite)

      {

        throw new AssemblyException(ite.getCause());

      }

    catch (IllegalAccessException iae)

      {

        throw new AssemblyException(iae);

      }

  }

  public Object endContext(Context outerContext) throws AssemblyException

  {

    notifyStatement(outerContext);

    return getResult();

  }

  public boolean subContextFailed()

  {

    return ! methodCalled;

  }

}