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Central module for Tapestry, containing interfaces to the Java
Servlet API and all core services and components.
// Copyright 2006, 2008, 2009 The Apache Software Foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package org.apache.tapestry5.internal.bindings;
import org.apache.tapestry5.PropertyConduit;
import org.apache.tapestry5.internal.TapestryInternalUtils;
import org.apache.tapestry5.internal.services.Invariant;
import org.apache.tapestry5.ioc.Location;
import org.apache.tapestry5.ioc.internal.util.TapestryException;
import java.lang.annotation.Annotation;
/**
* Base class for bindings created by the {@link org.apache.tapestry5.internal.bindings.PropBindingFactory}. A subclass
* of this is created at runtime.
*/
public class PropBinding extends AbstractBinding implements InternalPropBinding
{
private final Object root;
private final PropertyConduit conduit;
private final String toString;
private boolean invariant;
public PropBinding(final Location location, final Object root, final PropertyConduit conduit, final String toString
)
{
super(location);
this.root = root;
this.conduit = conduit;
this.toString = toString;
invariant = conduit.getAnnotation(Invariant.class) != null;
}
/**
* The default implementation of get() will throw a TapestryException (binding is write only). The fabricated
* subclass may override this method (as well as set()).
*/
public Object get()
{
try
{
return conduit.get(root);
}
catch (Exception ex)
{
throw new TapestryException(ex.getMessage(), getLocation(), ex);
}
}
@Override
public void set(Object value)
{
try
{
conduit.set(root, value);
}
catch (Exception ex)
{
throw new TapestryException(ex.getMessage(), getLocation(), ex);
}
}
@Override
public String toString()
{
return toString;
}
/**
* Almost always returns false, unless the conduit provides the {@link org.apache.tapestry5.internal.services.Invariant}
* annotation.
*/
@Override
public boolean isInvariant()
{
return invariant;
}
@Override
public Class getBindingType()
{
return conduit.getPropertyType();
}
@Override
public T getAnnotation(Class annotationClass)
{
return conduit.getAnnotation(annotationClass);
}
public String getPropertyName()
{
return TapestryInternalUtils.toInternalPropertyConduit(conduit).getPropertyName();
}
}