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## org.apache.fop.fonts
Class FontCache

    java.lang.Object
      org.apache.fop.fonts.FontCache

All Implemented Interfaces:
  java.io.Serializable

public final class FontCache
extends java.lang.Object
implements java.io.Serializable

Fop cache (currently only used for font info caching)

See Also:
  Serialized Form

Constructor Summary
`FontCache()` Default constructor

Method Summary
`void` | `addFont(EmbedFontInfo fontInfo)` Adds a font info to cache
`void` | `clear()` Clears font cache
`boolean` | `containsFont(EmbedFontInfo fontInfo)` is this font info in the cache?
`boolean` | `containsFont(java.lang.String embedUrl)` is this font in the cache?
`protected static java.lang.String` | `getCacheKey(EmbedFontInfo fontInfo)` creates a key given a font info for the font mapping
`static java.io.File` | `getDefaultCacheFile(boolean forWriting)` Returns the default font cache file.
`static java.io.File` | `getFileFromUrls(java.lang.String[] urls)` Tries to identify a File instance from an array of URLs.
`org.apache.fop.fonts.FontCache.CachedFontFile` | `getFontFile(java.lang.String embedUrl)` Returns a font from the cache.
`EmbedFontInfo[]` | `getFontInfos(java.lang.String embedUrl, long lastModified)` Returns the EmbedFontInfo instances belonging to a font file.
`static long` | `getLastModified(java.net.URL url)` Retrieve the last modified date/time of a URL.
`boolean` | `hasChanged()` cache has been updated since it was read
`boolean` | `isFailedFont(java.lang.String embedUrl, long lastModified)` has this font previously failed to load?
`static FontCache` | `load()` Reads the default font cache file and returns its contents.
`static FontCache` | `loadFrom(java.io.File cacheFile)` Reads a font cache file and returns its contents.
`void` | `registerFailedFont(java.lang.String embedUrl, long lastModified)` Registers a failed font with the cache
`void` | `removeFont(java.lang.String embedUrl)` removes font from cache
`void` | `save()` Writes the font cache to disk.
`void` | `saveTo(java.io.File cacheFile)` Writes the font cache to disk.

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

Constructor Detail

### FontCache

    public FontCache()

  Default constructor

Method Detail

### getDefaultCacheFile

    public static java.io.File getDefaultCacheFile(boolean forWriting)

  Returns the default font cache file.

  Parameters:
    `forWriting` - true if the user directory should be created
  Returns:
    the default font cache file

### load

    public static FontCache load()

  Reads the default font cache file and returns its contents.

  Returns:
    the font cache deserialized from the file (or null if no cache file exists or if it could not be read)

### loadFrom

    public static FontCache loadFrom(java.io.File cacheFile)

  Reads a font cache file and returns its contents.

  Parameters:
    `cacheFile` - the cache file
  Returns:
    the font cache deserialized from the file (or null if no cache file exists or if it could not be read)

### save

    public void save()
              throws FOPException

  Writes the font cache to disk.

  Throws:
    `FOPException` - fop exception

### saveTo

    public void saveTo(java.io.File cacheFile)
                throws FOPException

  Writes the font cache to disk.

  Parameters:
    `cacheFile` - the file to write to
  Throws:
    `FOPException` - fop exception

### getCacheKey

    protected static java.lang.String getCacheKey(EmbedFontInfo fontInfo)

  creates a key given a font info for the font mapping

  Parameters:
    `fontInfo` - font info
  Returns:
    font cache key

### hasChanged

    public boolean hasChanged()

  cache has been updated since it was read

  Returns:
    if this cache has changed

### containsFont

    public boolean containsFont(java.lang.String embedUrl)

  is this font in the cache?

  Parameters:
    `embedUrl` - font info
  Returns:
    boolean

### containsFont

    public boolean containsFont(EmbedFontInfo fontInfo)

  is this font info in the cache?

  Parameters:
    `fontInfo` - font info
  Returns:
    font

### getFileFromUrls

    public static java.io.File getFileFromUrls(java.lang.String[] urls)

  Tries to identify a File instance from an array of URLs. If there's no file URL in the array, the method returns null.

  Parameters:
    `urls` - array of possible font urls
  Returns:
    file font file

### addFont

    public void addFont(EmbedFontInfo fontInfo)

  Adds a font info to cache

  Parameters:
    `fontInfo` - font info

### getFontFile

    public org.apache.fop.fonts.FontCache.CachedFontFile getFontFile(java.lang.String embedUrl)

  Returns a font from the cache.

  Parameters:
    `embedUrl` - font info
  Returns:
    CachedFontFile object

### getFontInfos

    public EmbedFontInfo[] getFontInfos(java.lang.String embedUrl,
                                        long lastModified)

  Returns the EmbedFontInfo instances belonging to a font file. If the font file was modified since it was cached the entry is removed and null is returned.

  Parameters:
    `embedUrl` - the font URL
    `lastModified` - the last modified date/time of the font file
  Returns:
    the EmbedFontInfo instances or null if there's no cached entry or if it is outdated

### removeFont

    public void removeFont(java.lang.String embedUrl)

  removes font from cache

  Parameters:
    `embedUrl` - embed url

### isFailedFont

    public boolean isFailedFont(java.lang.String embedUrl,
                                long lastModified)

  has this font previously failed to load?

  Parameters:
    `embedUrl` - embed url
    `lastModified` - last modified
  Returns:
    whether this is a failed font

### registerFailedFont

    public void registerFailedFont(java.lang.String embedUrl,
                                   long lastModified)

  Registers a failed font with the cache

  Parameters:
    `embedUrl` - embed url
    `lastModified` - time last modified

### clear

    public void clear()

  Clears font cache

### getLastModified

    public static long getLastModified(java.net.URL url)

  Retrieve the last modified date/time of a URL.

  Parameters:
    `url` - the URL
  Returns:
    the last modified date/time

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