public static boolean writeImage()

in tools/src/main/java/org/apache/pdfbox/tools/imageio/ImageIOUtil.java [204:329]
107 lines of code
24 McCabe index (conditional complexity)

    public static boolean writeImage(BufferedImage image, String formatName, OutputStream output,
            int dpi, float compressionQuality, String compressionType) throws IOException
    {
        ImageOutputStream imageOutput = null;
        ImageWriter writer = null;
        try
        {
            // find suitable image writer
            Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName(formatName);
            ImageWriteParam param = null;
            IIOMetadata metadata = null;
            // Loop until we get the best driver, i.e. one that supports
            // setting dpi in the standard metadata format; however we'd also 
            // accept a driver that can't, if a better one can't be found
            while (writers.hasNext())
            {
                if (writer != null)
                {
                    writer.dispose();
                }
                writer = writers.next();
                if (writer != null)
                {
                    param = writer.getDefaultWriteParam();
                    metadata = writer.getDefaultImageMetadata(new ImageTypeSpecifier(image), param);
                    if (metadata != null
                            && !metadata.isReadOnly()
                            && metadata.isStandardMetadataFormatSupported())
                    {
                        break;
                    }
                }
            }
            if (writer == null)
            {
                LOG.error("No ImageWriter found for '{}' format", formatName);
                LOG.error("Supported formats: {}", Arrays.toString(ImageIO.getWriterFormatNames()));
                return false;
            }
            
            boolean isTifFormat = formatName.toLowerCase().startsWith("tif");

            // compression
            if (param != null && param.canWriteCompressed())
            {
                param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
                if (isTifFormat)
                {
                    if ("".equals(compressionType))
                    {
                        // default logic
                        TIFFUtil.setCompressionType(param, image);
                    }
                    else
                    {
                        param.setCompressionType(compressionType);
                        if (compressionType != null)
                        {
                            param.setCompressionQuality(compressionQuality);
                        }
                    }
                }
                else
                {
                    param.setCompressionType(param.getCompressionTypes()[0]);
                    param.setCompressionQuality(compressionQuality);
                }
            }

            if (metadata != null)
            {
                if (isTifFormat)
                {
                    // TIFF metadata
                    TIFFUtil.updateMetadata(metadata, image, dpi);
                }
                else if ("jpeg".equalsIgnoreCase(formatName) || "jpg".equalsIgnoreCase(formatName))
                {
                    // This segment must be run before other meta operations,
                    // or else "IIOInvalidTreeException: Invalid node: app0JFIF"
                    // The other (general) "meta" methods may not be used, because
                    // this will break the reading of the meta data in tests
                    JPEGUtil.updateMetadata(metadata, dpi);
                }
                else
                {
                    // write metadata is possible
                    if (!metadata.isReadOnly() && metadata.isStandardMetadataFormatSupported())
                    {
                        setDPI(metadata, dpi, formatName);
                    }
                }
            }

            if (metadata != null && formatName.equalsIgnoreCase("png") && hasICCProfile(image))
            {
                // add ICC profile
                IIOMetadataNode iccp = new IIOMetadataNode("iCCP");
                ICC_Profile profile = ((ICC_ColorSpace) image.getColorModel().getColorSpace())
                        .getProfile();
                iccp.setUserObject(getAsDeflatedBytes(profile));
                iccp.setAttribute("profileName", "unknown");
                iccp.setAttribute("compressionMethod", "deflate");
                Node nativeTree = metadata.getAsTree(metadata.getNativeMetadataFormatName());
                nativeTree.appendChild(iccp);
                metadata.mergeTree(metadata.getNativeMetadataFormatName(), nativeTree);
            }

            // write
            imageOutput = ImageIO.createImageOutputStream(output);
            writer.setOutput(imageOutput);
            writer.write(null, new IIOImage(image, null, metadata), param);
        }
        finally
        {
            if (writer != null)
            {
                writer.dispose();
            }
            if (imageOutput != null)
            {
                imageOutput.close();
            }
        }
        return true;
    }