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 * distributed with this work for additional information        *
 * regarding copyright ownership.  The ASF licenses this file   *
 * to you 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   *
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 * 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    *
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package org.apache.james.container.spring.resource;

import java.io.File;
import java.io.IOException;

import org.apache.james.filesystem.api.FileSystem;
import org.apache.james.filesystem.api.JamesDirectoriesProvider;
import org.apache.james.server.core.filesystem.ResourceFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.DefaultResourceLoader;
import org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.Resource;

/**
 * Abstract base class which load JAMES files based on the prefix. This can be
 * used in different {@link ApplicationContext} implementations
 */
public class DefaultJamesResourceLoader extends DefaultResourceLoader implements JamesResourceLoader {

    private final JamesDirectoriesProvider jamesDirectoriesProvider;
    private final ResourceFactory resourceFactory;

    public DefaultJamesResourceLoader(JamesDirectoriesProvider jamesDirectoriesProvider) {
        this.jamesDirectoriesProvider = jamesDirectoriesProvider;
        this.resourceFactory = new ResourceFactory(jamesDirectoriesProvider);
    }

    @Override
    public void validate(File file) throws IOException {
        resourceFactory.validate(file);
    }
    
    /**
     * Return the {@link Resource} for the given url. If the resource can not be
     * found null get returned
     */
    @Override
    public Resource getResource(String fileURL) {
        Resource r;
        if (fileURL.startsWith(FileSystem.CLASSPATH_PROTOCOL)) {
            String resourceName = fileURL.substring(FileSystem.CLASSPATH_PROTOCOL.length());
            r = new ClassPathResource(resourceName);
        } else if (fileURL.startsWith(FileSystem.FILE_PROTOCOL)) {
            File file;
            if (fileURL.startsWith(FileSystem.FILE_PROTOCOL_AND_CONF)) {
                file = new File(jamesDirectoriesProvider.getConfDirectory() + "/" + fileURL.substring(FileSystem.FILE_PROTOCOL_AND_CONF.length()));
            } else if (fileURL.startsWith(FileSystem.FILE_PROTOCOL_AND_VAR)) {
                file = new File(jamesDirectoriesProvider.getVarDirectory() + "/" + fileURL.substring(FileSystem.FILE_PROTOCOL_AND_VAR.length()));
            } else if (fileURL.startsWith(FileSystem.FILE_PROTOCOL_ABSOLUTE)) {
                file = new File(jamesDirectoriesProvider.getAbsoluteDirectory() + fileURL.substring(FileSystem.FILE_PROTOCOL_ABSOLUTE.length()));
            } else {
                // move to the root folder of the spring deployment
                file = new File(jamesDirectoriesProvider.getRootDirectory() + "/" + fileURL.substring(FileSystem.FILE_PROTOCOL.length()));
            }
            r = new FileSystemResource(file);
        } else {
            return null;
        }
        return r;
    }

    @Override
    public String getAbsoluteDirectory() {
        return jamesDirectoriesProvider.getAbsoluteDirectory();
    }

    @Override
    public String getConfDirectory() {
        return jamesDirectoriesProvider.getConfDirectory();
    }

    @Override
    public String getVarDirectory() {
        return jamesDirectoriesProvider.getVarDirectory();
    }

    @Override
    public String getRootDirectory() {
        return jamesDirectoriesProvider.getRootDirectory();
    }
    
}