/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * 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
 *
 *  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.struts2.util.classloader;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import java.io.File;
import java.io.FileInputStream;


/**
 * Reads a class from disk
 *  class taken from Apache JCI
 */
public final class FileResourceStore extends AbstractResourceStore {
    private static final Logger LOG = LogManager.getLogger(FileResourceStore.class);

    public FileResourceStore(final File file) {
        super(file);
    }

    @Override
    public byte[] read(final String pResourceName) {
        FileInputStream fis = null;
        try {
            File file = getFile(pResourceName);
            byte[] data = new byte[(int) file.length()];
            fis = new FileInputStream(file);
            fis.read(data);

            return data;
        } catch (Exception e) {
            LOG.debug("Unable to read file [{}]", pResourceName, e);
            return null;
        } finally {
            closeQuietly(fis);
        }
    }

    private File getFile(final String pResourceName) {
        final String fileName = pResourceName.replace('/', File.separatorChar);
        return new File(file, fileName);
    }
}
