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jlechner |
/* gnu.java.beans.decoder.PropertyContext
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Copyright (C) 2004 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.java.beans.decoder;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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/** PropertyContext is a Context implementation that is very similar to MethodContext
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* and IndexContext. The sole purpose of PropertyContext to find out whether it should
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* 'set' or 'get' a certain property. This decision is made using the number of
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* arguments.
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* <p>When the method call has to be made and there is no argument we 'get' the property.
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* With one argument it is 'set'.</p>
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*
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* @author Robert Schuster
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*/
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class PropertyContext extends AbstractObjectContext
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{
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private Object argument;
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private String propertyName;
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private String prefix = "get";
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private boolean methodCalled;
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PropertyContext(String id, String newPropertyName)
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{
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setId(id);
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propertyName = newPropertyName;
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}
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/* (non-Javadoc)
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* @see gnu.java.beans.decoder.Context#addObject(java.lang.Object)
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*/
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public void addParameterObject(Object o) throws AssemblyException
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{
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if (methodCalled)
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throw new AssemblyException(new IllegalArgumentException("Cannot add parameter object when method was already called."));
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if (argument != null)
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throw new AssemblyException(new IllegalArgumentException("Property attribut allows zero or one argument only."));
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argument = o;
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setStatement(true);
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prefix = "set";
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}
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/* (non-Javadoc)
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* @see gnu.java.beans.decoder.Context#endContext(gnu.java.beans.decoder.Context)
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*/
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public void notifyStatement(Context outerContext) throws AssemblyException
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{
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if (methodCalled)
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return;
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methodCalled = true;
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Object outerObject = outerContext.getResult();
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if (outerObject == null)
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throw new AssemblyException(new NullPointerException("No object to access property "
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+ propertyName));
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// converts property name into a method name
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String methodName = prefix + propertyName.substring(0, 1).toUpperCase()
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+ propertyName.substring(1);
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// prepares the argument
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Object[] args = (argument != null) ? new Object[] { argument } : null;
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try
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{
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Method method = MethodFinder.getMethod(outerObject.getClass(),
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methodName, args);
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// stores the result whether it is available or not
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setObject(method.invoke(outerObject, args));
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}
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catch (NoSuchMethodException nsme)
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{
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throw new AssemblyException(nsme);
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}
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catch (InvocationTargetException ite)
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{
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throw new AssemblyException(ite.getCause());
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}
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catch (IllegalAccessException iae)
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{
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throw new AssemblyException(iae);
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}
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}
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public Object endContext(Context outerContext) throws AssemblyException
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{
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notifyStatement(outerContext);
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return getResult();
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}
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public boolean subContextFailed()
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{
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return ! methodCalled;
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}
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}
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