// Copyright 2006, 2007 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.tapestry.internal.services;
import static org.apache.tapestry.ioc.internal.util.Defense.notBlank;
import static org.apache.tapestry.ioc.internal.util.Defense.notNull;
import java.util.Map;
import org.apache.tapestry.Binding;
import org.apache.tapestry.ComponentResources;
import org.apache.tapestry.ioc.Location;
import org.apache.tapestry.ioc.internal.util.TapestryException;
import org.apache.tapestry.services.BindingFactory;
import org.apache.tapestry.services.BindingSource;
public class BindingSourceImpl implements BindingSource
{
private final Map<String, BindingFactory> _factories;
public BindingSourceImpl(Map<String, BindingFactory> factories)
{
_factories = factories;
}
public Binding newBinding(String description, ComponentResources container,
String defaultPrefix, String expression)
{
return newBinding(description, container, container, defaultPrefix, expression, null);
}
public Binding newBinding(String description, ComponentResources container,
ComponentResources component, String defaultPrefix, String expression, Location location)
{
notBlank(description, "description");
notNull(container, "container");
notNull(component, "component");
notBlank(defaultPrefix, "defaultPrefix");
notBlank(expression, "expression");
// Location might be null
String subexpression = expression;
int colonx = expression.indexOf(':');
BindingFactory factory = null;
if (colonx > 0)
{
String prefix = expression.substring(0, colonx);
factory = _factories.get(prefix);
if (factory != null)
subexpression = expression.substring(colonx + 1);
}
if (factory == null)
factory = _factories.get(defaultPrefix);
// And if that's null, what then? We assume that the default prefix is a valid prefix,
// or we'll get an NPE below and report it like any other error.
try
{
return factory.newBinding(description, container, component, subexpression, location);
}
catch (Exception ex)
{
throw new TapestryException(ServicesMessages.bindingSourceFailure(expression, ex),
location, ex);
}
}
}