Java ImageWriter.getOriginatingProvider方法代码示例

import javax.imageio.ImageWriter; //导入方法依赖的package包/类
public void doTest() {
    File pwd = new File(".");
    try {
        File f = File.createTempFile("transparency_test_", ".gif", pwd);
        System.out.println("file: " + f.getCanonicalPath());

        ImageWriter w = ImageIO.getImageWritersByFormatName("GIF").next();

        ImageWriterSpi spi = w.getOriginatingProvider();

        boolean succeed_write = ImageIO.write(src, "gif", f);

        if (!succeed_write) {
            throw new RuntimeException("Test failed: failed to write src.");
        }

        dst = ImageIO.read(f);

        checkResult(src, dst);

    } catch (IOException e) {
        throw new RuntimeException("Test failed.", e);
    }
}
 

import javax.imageio.ImageWriter; //导入方法依赖的package包/类
/** Checks that the provided <code>ImageWriter</code> can encode
 * the provided <code>ImageTypeSpecifier</code> or not.  If not, an
 * <code>IIOException</code> will be thrown.
 * @param writer The provided <code>ImageWriter</code>.
 * @param type The image to be tested.
 * @throws IIOException If the writer cannot encoded the provided image.
 */
public static final void canEncodeImage(ImageWriter writer,
                                        ImageTypeSpecifier type)
    throws IIOException {
    ImageWriterSpi spi = writer.getOriginatingProvider();

    if(type != null && spi != null && !spi.canEncodeImage(type))  {
        throw new IIOException(I18N.getString("ImageUtil2")+" "+
                               writer.getClass().getName());
    }
}
 

import javax.imageio.ImageWriter; //导入方法依赖的package包/类
/** Checks that the provided {@code ImageWriter} can encode
 * the provided {@code ImageTypeSpecifier} or not.  If not, an
 * {@code IIOException} will be thrown.
 * @param writer The provided {@code ImageWriter}.
 * @param type The image to be tested.
 * @throws IIOException If the writer cannot encoded the provided image.
 */
public static final void canEncodeImage(ImageWriter writer,
                                        ImageTypeSpecifier type)
    throws IIOException {
    ImageWriterSpi spi = writer.getOriginatingProvider();

    if(type != null && spi != null && !spi.canEncodeImage(type))  {
        throw new IIOException(I18N.getString("ImageUtil2")+" "+
                               writer.getClass().getName());
    }
}
 

import javax.imageio.ImageWriter; //导入方法依赖的package包/类
public LinkedHashSet<String> getPlatformMappingsForFlavor(DataFlavor df) {
    LinkedHashSet<String> natives = new LinkedHashSet<>(1);

    if (df == null) {
        return natives;
    }

    String charset = df.getParameter("charset");
    String baseType = df.getPrimaryType() + "/" + df.getSubType();
    String mimeType = baseType;

    if (charset != null && DataTransferer.isFlavorCharsetTextType(df)) {
        mimeType += ";charset=" + charset;
    }

    // Add a mapping to the MIME native whenever the representation class
    // doesn't require translation.
    if (df.getRepresentationClass() != null &&
        (df.isRepresentationClassInputStream() ||
         df.isRepresentationClassByteBuffer() ||
         byte[].class.equals(df.getRepresentationClass()))) {
        natives.add(mimeType);
    }

    if (DataFlavor.imageFlavor.equals(df)) {
        String[] mimeTypes = ImageIO.getWriterMIMETypes();
        if (mimeTypes != null) {
            for (int i = 0; i < mimeTypes.length; i++) {
                Iterator writers =
                    ImageIO.getImageWritersByMIMEType(mimeTypes[i]);

                while (writers.hasNext()) {
                    ImageWriter imageWriter = (ImageWriter)writers.next();
                    ImageWriterSpi writerSpi =
                        imageWriter.getOriginatingProvider();

                    if (writerSpi != null &&
                        writerSpi.canEncodeImage(getDefaultImageTypeSpecifier())) {
                        natives.add(mimeTypes[i]);
                        break;
                    }
                }
            }
        }
    } else if (DataTransferer.isFlavorCharsetTextType(df)) {
        // stringFlavor is semantically equivalent to the standard
        // "text/plain" MIME type.
        if (DataFlavor.stringFlavor.equals(df)) {
            baseType = "text/plain";
        }

        for (String encoding : DataTransferer.standardEncodings()) {
            if (!encoding.equals(charset)) {
                natives.add(baseType + ";charset=" + encoding);
            }
        }

        // Add a MIME format without specified charset.
        if (!natives.contains(baseType)) {
            natives.add(baseType);
        }
    }

    return natives;
}
 

import javax.imageio.ImageWriter; //导入方法依赖的package包/类
@Override
public LinkedHashSet<String> getPlatformMappingsForFlavor(DataFlavor df) {
    LinkedHashSet<String> natives = new LinkedHashSet<>(1);

    if (df == null) {
        return natives;
    }

    String charset = df.getParameter("charset");
    String baseType = df.getPrimaryType() + "/" + df.getSubType();
    String mimeType = baseType;

    if (charset != null && DataFlavorUtil.isFlavorCharsetTextType(df)) {
        mimeType += ";charset=" + charset;
    }

    // Add a mapping to the MIME native whenever the representation class
    // doesn't require translation.
    if (df.getRepresentationClass() != null &&
        (df.isRepresentationClassInputStream() ||
         df.isRepresentationClassByteBuffer() ||
         byte[].class.equals(df.getRepresentationClass()))) {
        natives.add(mimeType);
    }

    if (DataFlavor.imageFlavor.equals(df)) {
        String[] mimeTypes = ImageIO.getWriterMIMETypes();
        if (mimeTypes != null) {
            for (String mime : mimeTypes) {
                Iterator<ImageWriter> writers = ImageIO.getImageWritersByMIMEType(mime);
                while (writers.hasNext()) {
                    ImageWriter imageWriter = writers.next();
                    ImageWriterSpi writerSpi = imageWriter.getOriginatingProvider();

                    if (writerSpi != null &&
                            writerSpi.canEncodeImage(getDefaultImageTypeSpecifier())) {
                        natives.add(mime);
                        break;
                    }
                }
            }
        }
    } else if (DataFlavorUtil.isFlavorCharsetTextType(df)) {
        // stringFlavor is semantically equivalent to the standard
        // "text/plain" MIME type.
        if (DataFlavor.stringFlavor.equals(df)) {
            baseType = "text/plain";
        }

        for (String encoding : DataFlavorUtil.standardEncodings()) {
            if (!encoding.equals(charset)) {
                natives.add(baseType + ";charset=" + encoding);
            }
        }

        // Add a MIME format without specified charset.
        if (!natives.contains(baseType)) {
            natives.add(baseType);
        }
    }

    return natives;
}