001    // Copyright 2010 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    // http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry5.internal.services.javascript;
016    
017    import java.util.List;
018    import java.util.Map;
019    
020    import org.apache.tapestry5.func.F;
021    import org.apache.tapestry5.ioc.util.AvailableValues;
022    import org.apache.tapestry5.ioc.util.UnknownValueException;
023    import org.apache.tapestry5.services.javascript.JavaScriptStack;
024    import org.apache.tapestry5.services.javascript.JavaScriptStackSource;
025    
026    public class JavaScriptStackSourceImpl implements JavaScriptStackSource
027    {
028        private final Map<String, JavaScriptStack> configuration;
029    
030        public JavaScriptStackSourceImpl(Map<String, JavaScriptStack> configuration)
031        {
032            this.configuration = configuration;
033        }
034    
035        public JavaScriptStack getStack(String name)
036        {
037            JavaScriptStack stack = configuration.get(name);
038    
039            if (stack == null)
040                throw new UnknownValueException(String.format("No JavaScriptStack with name '%s'.", name),
041                        new AvailableValues("Configured JavaScript stacks", configuration));
042    
043            return stack;
044        }
045    
046        public List<String> getStackNames()
047        {
048            return F.flow(configuration.keySet()).sort().toList();
049        }
050    }