| // Copyright 2006, 2007, 2008 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 org.apache.tapestry.Binding; |
| import org.apache.tapestry.ComponentResources; |
| import org.apache.tapestry.ioc.Location; |
| import org.apache.tapestry.ioc.internal.util.Defense; |
| import org.apache.tapestry.ioc.internal.util.InternalUtils; |
| import org.apache.tapestry.ioc.internal.util.TapestryException; |
| import org.apache.tapestry.services.BindingFactory; |
| import org.apache.tapestry.services.BindingSource; |
| |
| import java.util.Map; |
| |
| public class BindingSourceImpl implements BindingSource |
| { |
| private final Map<String, BindingFactory> factories; |
| |
| public BindingSourceImpl(Map<String, BindingFactory> factories) |
| { |
| this.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) |
| { |
| Defense.notBlank(description, "description"); |
| Defense.notNull(container, "container"); |
| Defense.notNull(component, "component"); |
| Defense.notBlank(defaultPrefix, "defaultPrefix"); |
| |
| if (InternalUtils.isBlank(expression)) |
| throw new TapestryException(ServicesMessages.emptyBinding(description), location, null); |
| |
| // 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); |
| } |
| } |
| } |