org.apache.wicket.util.resource.FileResourceStream.java Source code

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Here is the source code for org.apache.wicket.util.resource.FileResourceStream.java

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/*
 * 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.wicket.util.resource;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.URLConnection;

import org.apache.wicket.util.file.File;
import org.apache.wicket.util.lang.Args;
import org.apache.wicket.util.lang.Bytes;
import org.apache.wicket.util.time.Time;

/**
 * A FileResourceStream is an IResource implementation for files.
 * 
 * @see org.apache.wicket.util.resource.IResourceStream
 * @see org.apache.wicket.util.watch.IModifiable
 * @author Jonathan Locke
 */
public class FileResourceStream extends AbstractResourceStream implements IFixedLocationResourceStream {
    private static final long serialVersionUID = 1L;

    /** Any associated file */
    private final File file;

    /** Resource stream */
    private transient InputStream inputStream;

    /**
     * Constructor.
     * 
     * @param file
     *            {@link File} containing resource
     */
    public FileResourceStream(final File file) {
        Args.notNull(file, "file");
        this.file = file;
    }

    /**
     * Constructor.
     * 
     * @param file
     *            {@link java.io.File} containing resource
     */
    public FileResourceStream(final java.io.File file) {
        this.file = new File(file);
    }

    /**
     * Closes this resource.
     * 
     * @throws IOException
     */
    @Override
    public void close() throws IOException {
        if (inputStream != null) {
            inputStream.close();
            inputStream = null;
        }
    }

    @Override
    public String getContentType() {
        String contentType = null;
        if (file != null) {
            contentType = URLConnection.getFileNameMap().getContentTypeFor(file.getName());
        }
        return contentType;
    }

    /**
     * @return The file this resource resides in, if any.
     */
    public File getFile() {
        return file;
    }

    /**
     * @return A readable input stream for this resource. The same input stream is returned until
     *         <tt>FileResourceStream.close()</tt> is invoked.
     * 
     * @throws ResourceStreamNotFoundException
     */
    @Override
    public InputStream getInputStream() throws ResourceStreamNotFoundException {
        if (inputStream == null) {
            try {
                inputStream = new FileInputStream(file);
            } catch (FileNotFoundException e) {
                throw new ResourceStreamNotFoundException("Resource " + file + " could not be found", e);
            }
        }

        return inputStream;
    }

    /**
     * @see org.apache.wicket.util.watch.IModifiable#lastModifiedTime()
     * @return The last time this resource was modified
     */
    @Override
    public Time lastModifiedTime() {
        if (file != null) {
            return file.lastModifiedTime();
        }
        return null;
    }

    @Override
    public String toString() {
        if (file != null) {
            return file.toString();
        }
        return "";
    }

    @Override
    public Bytes length() {
        if (file != null) {
            return Bytes.bytes(file.length());
        }
        return null;
    }

    @Override
    public String locationAsString() {
        if (file != null) {
            return file.getAbsolutePath();
        }
        return null;
    }
}