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## org.apache.fop.pdf
Class PDFFilterList

    java.lang.Object
      org.apache.fop.pdf.PDFFilterList

    public class PDFFilterList

extends java.lang.Object

This class represents a list of PDF filters to be applied when serializing the output of a PDF object.

Field Summary
`static java.lang.String` | `CONTENT_FILTER` Key for the filter used for normal content
`static java.lang.String` | `DEFAULT_FILTER` Key for the default filter
`static java.lang.String` | `FONT_FILTER` Key for the filter used for fonts
`static java.lang.String` | `IMAGE_FILTER` Key for the filter used for images
`static java.lang.String` | `JPEG_FILTER` Key for the filter used for JPEG images
`static java.lang.String` | `METADATA_FILTER` Key for the filter used for metadata
`static java.lang.String` | `PRECOMPRESSED_FILTER` Key for the filter used for precompressed content
`static java.lang.String` | `TIFF_FILTER` Key for the filter used for TIFF images

Constructor Summary
`PDFFilterList()` Default constructor.
`PDFFilterList(boolean ignoreASCIIFilters)` Use this descriptor if you want to have ASCII filters (such as ASCIIHex and ASCII85) ignored, for example, when encryption is active.

Method Summary
`void` | `addDefaultFilters(java.util.Map filters, java.lang.String type)` Adds the default filters to this stream.
`void` | `addFilter(PDFFilter filter)` Add a filter for compression of the stream.
`void` | `addFilter(java.lang.String filterType)` Add a filter for compression of the stream by name.
`java.io.OutputStream` | `applyFilters(java.io.OutputStream stream)` Applies all registered filters as necessary.
`protected java.lang.String` | `buildFilterDictEntries()` Apply the filters to the data in the order given and return the /Filter and /DecodeParms entries for the stream dictionary.
`void` | `ensureFilterInPlace(PDFFilter pdfFilter)` Checks the filter list for the filter and adds it in the correct place if necessary.
`boolean` | `isDisableAllFilters()` Returns true if all filters are disabled.
`boolean` | `isInitialized()` Indicates whether the filter list is already initialized.
`protected void` | `putFilterDictEntries(PDFDictionary dict)` Apply the filters to the data in the order given and add the /Filter and /DecodeParms entries to the stream dictionary.
`void` | `setDisableAllFilters(boolean value)` Used to disable all filters.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### DEFAULT_FILTER

    public static final java.lang.String DEFAULT_FILTER

  Key for the default filter

  See Also:
    Constant Field Values

### CONTENT_FILTER

    public static final java.lang.String CONTENT_FILTER

  Key for the filter used for normal content

  See Also:
    Constant Field Values

### PRECOMPRESSED_FILTER

    public static final java.lang.String PRECOMPRESSED_FILTER

  Key for the filter used for precompressed content

  See Also:
    Constant Field Values

### IMAGE_FILTER

    public static final java.lang.String IMAGE_FILTER

  Key for the filter used for images

  See Also:
    Constant Field Values

### JPEG_FILTER

    public static final java.lang.String JPEG_FILTER

  Key for the filter used for JPEG images

  See Also:
    Constant Field Values

### TIFF_FILTER

    public static final java.lang.String TIFF_FILTER

  Key for the filter used for TIFF images

  See Also:
    Constant Field Values

### FONT_FILTER

    public static final java.lang.String FONT_FILTER

  Key for the filter used for fonts

  See Also:
    Constant Field Values

### METADATA_FILTER

    public static final java.lang.String METADATA_FILTER

  Key for the filter used for metadata

  See Also:
    Constant Field Values

Constructor Detail

### PDFFilterList

    public PDFFilterList()

  Default constructor.

  The flag for ignoring ASCII filters defaults to false.

### PDFFilterList

    public PDFFilterList(boolean ignoreASCIIFilters)

  Use this descriptor if you want to have ASCII filters (such as ASCIIHex and ASCII85) ignored, for example, when encryption is active.

  Parameters:
    `ignoreASCIIFilters` - true if ASCII filters should be ignored

Method Detail

### setDisableAllFilters

    public void setDisableAllFilters(boolean value)

  Used to disable all filters.

  Parameters:
    `value` - true if all filters shall be disabled

### isDisableAllFilters

    public boolean isDisableAllFilters()

  Returns true if all filters are disabled.

  Returns:
    true if all filters are disabled

### isInitialized

    public boolean isInitialized()

  Indicates whether the filter list is already initialized.

  Returns:
    true if more there are filters present

### addFilter

    public void addFilter(PDFFilter filter)

  Add a filter for compression of the stream. Filters are applied in the order they are added. This should always be a new instance of the particular filter of choice. The applied flag in the filter is marked true after it has been applied to the data.

  Parameters:
    `filter` - filter to add

### addFilter

    public void addFilter(java.lang.String filterType)

  Add a filter for compression of the stream by name.

  Parameters:
    `filterType` - name of the filter to add

### ensureFilterInPlace

    public void ensureFilterInPlace(PDFFilter pdfFilter)

  Checks the filter list for the filter and adds it in the correct place if necessary.

  Parameters:
    `pdfFilter` - the filter to check / add

### addDefaultFilters

    public void addDefaultFilters(java.util.Map filters,
                                  java.lang.String type)

  Adds the default filters to this stream.

  Parameters:
    `filters` - Map of filters
    `type` - which filter list to modify

### buildFilterDictEntries

    protected java.lang.String buildFilterDictEntries()

  Apply the filters to the data in the order given and return the /Filter and /DecodeParms entries for the stream dictionary. If the filters have already been applied to the data (either externally, or internally) then the dictionary entries are built and returned.

  Returns:
    a String representing the filter list

### putFilterDictEntries

    protected void putFilterDictEntries(PDFDictionary dict)

  Apply the filters to the data in the order given and add the /Filter and /DecodeParms entries to the stream dictionary. If the filters have already been applied to the data (either externally, or internally) then the dictionary entries added.

  Parameters:
    `dict` - the PDFDictionary to set the entries on

### applyFilters

    public java.io.OutputStream applyFilters(java.io.OutputStream stream)
                                      throws java.io.IOException

  Applies all registered filters as necessary. The method returns an OutputStream which will receive the filtered contents.

  Parameters:
    `stream` - raw data output stream
  Returns:
    OutputStream filtered output stream
  Throws:
    `java.io.IOException` - In case of an I/O problem

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