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    
019    import org.apache.tapestry5.Asset;
020    import org.apache.tapestry5.SymbolConstants;
021    import org.apache.tapestry5.func.F;
022    import org.apache.tapestry5.func.Mapper;
023    import org.apache.tapestry5.internal.services.RequestConstants;
024    import org.apache.tapestry5.ioc.annotations.Symbol;
025    import org.apache.tapestry5.ioc.internal.util.CollectionFactory;
026    import org.apache.tapestry5.ioc.services.ThreadLocale;
027    import org.apache.tapestry5.services.assets.AssetPathConstructor;
028    import org.apache.tapestry5.services.javascript.JavaScriptStack;
029    import org.apache.tapestry5.services.javascript.JavaScriptStackSource;
030    
031    public class JavaScriptStackPathConstructorImpl implements JavaScriptStackPathConstructor
032    {
033        private final ThreadLocale threadLocale;
034    
035        private final AssetPathConstructor assetPathConstructor;
036    
037        private final JavaScriptStackSource javascriptStackSource;
038    
039        private final boolean combineScripts;
040    
041        private final Mapper<Asset, String> toPath = new Mapper<Asset, String>()
042        {
043            public String map(Asset input)
044            {
045                return input.toClientURL();
046            }
047        };
048    
049        public JavaScriptStackPathConstructorImpl(ThreadLocale threadLocale, AssetPathConstructor assetPathConstructor,
050                JavaScriptStackSource javascriptStackSource,
051    
052                @Symbol(SymbolConstants.COMBINE_SCRIPTS)
053                boolean combineScripts)
054        {
055            this.threadLocale = threadLocale;
056            this.assetPathConstructor = assetPathConstructor;
057            this.javascriptStackSource = javascriptStackSource;
058            this.combineScripts = combineScripts;
059        }
060    
061        public List<String> constructPathsForJavaScriptStack(String stackName)
062        {
063            JavaScriptStack stack = javascriptStackSource.getStack(stackName);
064    
065            List<Asset> assets = stack.getJavaScriptLibraries();
066    
067            if (assets.size() > 1 && combineScripts)
068                return combinedStackURL(stackName);
069    
070            return toPaths(assets);
071        }
072    
073        private List<String> toPaths(List<Asset> assets)
074        {
075            assert assets != null;
076            return F.flow(assets).map(toPath).toList();
077        }
078    
079        private List<String> combinedStackURL(String stackName)
080        {
081            String path = String.format("%s/%s.js", threadLocale.getLocale().toString(), stackName);
082    
083            String stackURL = assetPathConstructor.constructAssetPath(RequestConstants.STACK_FOLDER, path);
084    
085            return CollectionFactory.newList(stackURL);
086        }
087    
088    }