001// Licensed under the Apache License, Version 2.0 (the "License");
002// you may not use this file except in compliance with the License.
003// You may obtain a copy of the License at
004//
005// http://www.apache.org/licenses/LICENSE-2.0
006//
007// Unless required by applicable law or agreed to in writing, software
008// distributed under the License is distributed on an "AS IS" BASIS,
009// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
010// See the License for the specific language governing permissions and
011// limitations under the License.
012
013package org.apache.tapestry5.internal.webresources;
014
015import com.github.sommeri.less4j.LessSource;
016import org.apache.commons.io.IOUtils;
017import org.apache.tapestry5.ioc.Resource;
018import org.apache.tapestry5.ioc.internal.util.InternalUtils;
019import org.apache.tapestry5.services.assets.ResourceDependencies;
020
021import java.io.FileNotFoundException;
022import java.io.IOException;
023import java.io.InputStreamReader;
024import java.io.Reader;
025
026public class ResourceLessSource extends LessSource
027{
028    private final Resource resource;
029
030    private final ResourceDependencies dependencies;
031
032    ResourceLessSource(Resource resource, ResourceDependencies dependencies)
033    {
034        this.resource = resource;
035        this.dependencies = dependencies;
036    }
037
038    @Override
039    public LessSource relativeSource(String filename) throws FileNotFound, CannotReadFile, StringSourceException
040    {
041        Resource relative = resource.forFile(filename);
042
043        if (!relative.exists())
044        {
045            throw new FileNotFound();
046        }
047
048        dependencies.addDependency(relative);
049
050        return new ResourceLessSource(relative, dependencies);
051    }
052
053    @Override
054    public String getContent() throws FileNotFound, CannotReadFile
055    {
056        // Adapted from Less's URLSource
057        Reader input = null;
058        try
059        {
060            input = new InputStreamReader(resource.openStream());
061            String content = IOUtils.toString(input).replace("\r\n", "\n");
062
063            return content;
064        } catch (FileNotFoundException ex)
065        {
066            throw new FileNotFound();
067        } catch (IOException ex)
068        {
069            throw new CannotReadFile();
070        } finally
071        {
072            InternalUtils.close(input);
073        }
074    }
075
076    @Override
077    public byte[] getBytes() throws FileNotFound, CannotReadFile
078    {
079        Reader input = null;
080        try
081        {
082            input = new InputStreamReader(resource.openStream());
083
084            return IOUtils.toByteArray(input);
085        } catch (FileNotFoundException ex)
086        {
087            throw new FileNotFound();
088        } catch (IOException ex)
089        {
090            throw new CannotReadFile();
091        } finally
092        {
093            InternalUtils.close(input);
094        }
095
096    }
097}