FontFactory.java

/*
 * FontFactory.java
 * Transform
 *
 * Copyright (c) 2009-2010 Flagstone Software Ltd. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *  * Neither the name of Flagstone Software Ltd. nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

package com.flagstone.transform.util.font;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.zip.DataFormatException;

/**
 * ImageFactory is used to generate an image definition object from an image
 * stored in a file, references by a URL or read from an stream. An plug-in
 * architecture allows decoders to be registered to handle different image
 * formats. The ImageFactory provides a standard interface for using the
 * decoders.
 */
public final class FontFactory {
    /** The object used to decode the font. */
    private transient FontDecoder decoder;

    /**
     * Read a font stored in the specified file.
     *
     * @param file
     *            a file containing the abstract path to the font.
     *
     * @throws IOException
     *             if there is an error reading the file.
     *
     * @throws DataFormatException
     *             if there is a problem decoding the font, either it is in an
     *             unsupported format or an error occurred while decoding the
     *             data.
     */
    public void read(final File file) throws IOException, DataFormatException {

        String fontType;

        if (file.getName().endsWith("ttf")) {
            fontType = "ttf";
        } else if (file.getName().endsWith("swf")) {
            fontType = "swf";
        } else {
            throw new DataFormatException("Unsupported format");
        }

        decoder = FontRegistry.getFontProvider(fontType);
        decoder.read(file);
    }

    /**
     * Read a font referenced by a URL.
     *
     * @param url
     *            the Uniform Resource Locator referencing the file.
     *
     * @throws IOException
     *             if there is an error reading the file.
     *
     * @throws DataFormatException
     *             if there is a problem decoding the font, either it is in an
     *             unsupported format or an error occurred while decoding the
     *             font data.
     */
    public void read(final URL url) throws IOException, DataFormatException {

        final URLConnection connection = url.openConnection();
        final int fileSize = connection.getContentLength();

        if (fileSize < 0) {
            throw new FileNotFoundException(url.getFile());
        }

        final String mimeType = connection.getContentType();
        decoder = FontRegistry.getFontProvider(mimeType);

        if (decoder == null) {
            throw new DataFormatException("Unsupported format");
        }

        decoder.read(url);
    }

    /**
     * Get the list of fonts decoded.
     * @return a list containing a Font object for each font decoded.
     */
    public List<Font> getFonts() {
        return decoder.getFonts();
    }
}