src/java/org/apache/fop/fonts/FontInfo.java - xmlgraphics-fop - Git at Google

 /*
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.
  * The ASF licenses this file to You under the Apache License, Version 2.0
  * (the "License"); you may not use this file except in compliance with
  * the License.  You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 /* $Id$ */

 package org.apache.fop.fonts;

 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;

 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;


 /**
  * The FontInfo for the layout and rendering of a fo document.
  * This stores the list of available fonts that are setup by
  * the renderer. The font name can be retrieved for the
  * family style and weight.
  * <br>
  * Currently font supported font-variant small-caps is not
  * implemented.
  */
 public class FontInfo {

     private static final FontTriplet[] TRIPLETS_TYPE = new FontTriplet[1];

     /** logging instance */
     protected static Log log = LogFactory.getLog(FontInfo.class);

     /** Map containing fonts that have been used */
     private Map usedFonts; //Map<String,FontMetrics> (String = font key)

     /** look up a font-triplet to find a font-name */
     private Map triplets; //Map<FontTriplet,String> (String = font key)

     /** look up a font-triplet to find its priority
      *  (only used inside addFontProperties()) */
     private Map tripletPriorities; //Map<FontTriplet,Integer>

     /** look up a font-name to get a font (that implements FontMetrics at least) */
     private Map fonts; //Map<String,FontMetrics> (String = font key)

     /** collection of missing fonts; used to make sure the user gets
      *  a warning for a missing font only once (not every time the font is used)
      */
     private Collection loggedFontKeys;

     /** Cache for Font instances. */
     private Map fontInstanceCache = new java.util.HashMap();

     /**
      * Main constructor
      */
     public FontInfo() {
         this.triplets = new java.util.HashMap();
         this.tripletPriorities = new java.util.HashMap();
         this.fonts = new java.util.HashMap();
         this.usedFonts = new java.util.HashMap();
     }

     /**
      * Checks if the font setup is valid (At least the ultimate fallback font
      * must be registered.)
      * @return True if valid
      */
     public boolean isSetupValid() {
         //We're only called when font setup is done:
         tripletPriorities = null; // candidate for garbage collection
         return triplets.containsKey(Font.DEFAULT_FONT);
     }

     /**
      * Adds a new font triplet.
      * @param name internal key
      * @param family font family name
      * @param style font style (normal, italic, oblique...)
      * @param weight font weight
      */
     public void addFontProperties(String name, String family, String style, int weight) {
         addFontProperties(name, createFontKey(family, style, weight));
     }

     /**
      * Adds a new font triplet.
      * @param name internal key
      * @param triplet the font triplet to associate with the internal key
      */
     public void addFontProperties(String name, FontTriplet triplet) {
         /*
          * add the given family, style and weight as a lookup for the font
          * with the given name
          */
         if (log.isDebugEnabled()) {
             log.debug("Registering: " + triplet + " under " + name);
         }
         String oldName = (String)triplets.get(triplet);
         int newPriority = triplet.getPriority();
         if (oldName != null) {
             int oldPriority = ((Integer)tripletPriorities.get(triplet)).intValue();
             if (oldPriority < newPriority) {
                 logDuplicateFont(triplet, false, oldName, oldPriority,
                             name, newPriority);
                 return;
             } else {
                 logDuplicateFont(triplet, true, oldName, oldPriority,
                             name, newPriority);
             }
         }
         this.triplets.put(triplet, name);
         this.tripletPriorities.put(triplet, new Integer(newPriority));
     }

     /** Log warning about duplicate font triplets.
      * @param triplet the duplicate font triplet
      * @param replacing true iff the new font will replace the old one
      * @param oldKey the old internal font name
      * @param oldPriority the priority of the existing font mapping
      * @param newKey the new internal font name
      * @param newPriority the priority of the duplicate font mapping
      */
     private void logDuplicateFont(FontTriplet triplet, boolean replacing,
                                   String oldKey, int oldPriority,
                                   String newKey, int newPriority) {
         if (log.isDebugEnabled()) {
             log.debug(triplet
                     + (replacing ? ": Replacing " : ": Not replacing ")
                     + ((FontMetrics)fonts.get(triplets.get(triplet))).getFullName()
                     + " (" + oldPriority + ") by "
                     + ((FontMetrics)fonts.get(newKey)).getFullName()
                     + " (" + newPriority + ")");
         }
     }

     /**
      * Adds font metrics for a specific font.
      * @param name internal key
      * @param metrics metrics to register
      */
     public void addMetrics(String name, FontMetrics metrics) {
         // add the given metrics as a font with the given name

         this.fonts.put(name, metrics);
     }

     /**
      * Lookup a font.
      * <br>
      * Locate the font name for a given family, style and weight.
      * The font name can then be used as a key as it is unique for
      * the associated document.
      * This also adds the font to the list of used fonts.
      * @param family font family
      * @param style font style
      * @param weight font weight
      * @param substFont true if the font may be substituted with the
      *                  default font if not found
      * @return internal key
      */
     private FontTriplet fontLookup(String family, String style,
                              int weight, boolean substFont) {
         if (log.isTraceEnabled()) {
             log.trace("Font lookup: " + family + " " + style + " " + weight);
         }
         FontTriplet startKey = createFontKey(family, style, weight);
         FontTriplet key = startKey;
         // first try given parameters
         String f = getInternalFontKey(key);
         if (f == null) {
             key = doAdjustedLookup(family, style, weight, startKey, substFont);
         }

         if (key != null) {
             if (key != startKey) {
                 notifyFontReplacement(startKey, key);
             }
             return key;
         } else {
             return null;
         }
     }

     private FontTriplet doAdjustedLookup(String family, String style,
             int weight, FontTriplet startKey, boolean substFont) {
         FontTriplet key;
         String f;
         if (!family.equals(startKey.getName())) {
             key = createFontKey(family, style, weight);
             f = getInternalFontKey(key);
             if (f != null) {
                 return key;
             }
         }

         // adjust weight, favouring normal or bold
         key = findAdjustWeight(family, style, weight);
         f = getInternalFontKey(key);

         if (!substFont && f == null) {
             return null;
         }

         // only if the font may be substituted
         // fallback 1: try the same font-family and weight with default style
         if (f == null && style != Font.STYLE_NORMAL) {
             key = createFontKey(family, Font.STYLE_NORMAL, weight);
             f = getInternalFontKey(key);
         }

         if (f == null && weight != Font.WEIGHT_NORMAL) {
             int diffWeight = (Font.WEIGHT_NORMAL - weight) / 100;
             int direction = diffWeight > 0 ? 1 : -1;
             int tryWeight = weight;
             while (tryWeight != Font.WEIGHT_NORMAL) {
                 tryWeight += 100 * direction;
                 key = createFontKey(family, style, weight);
                 f = getInternalFontKey(key);
                 if (f == null) {
                     key = createFontKey(family, Font.STYLE_NORMAL, weight);
                     f = getInternalFontKey(key);
                 }
                 if (f != null) {
                     break;
                 }
             }
         }

         // fallback 2: try the same font-family with default style and weight
         /* obsolete: replaced by the loop above
         if (f == null) {
             key = createFontKey(family, Font.STYLE_NORMAL, Font.WEIGHT_NORMAL);
             f = getInternalFontKey(key);
         }*/

         // fallback 3: try any family with orig style/weight
         if (f == null) {
             return doAdjustedLookup("any", style, weight, startKey, false);
         }

         // last resort: use default
         if (f == null) {
             key = Font.DEFAULT_FONT;
             f = getInternalFontKey(key);
         }

         if (f != null) {
             return key;
         } else {
             return null;
         }
     }

     /**
      * Tells this class that the font with the given internal name has been used.
      * @param internalName the internal font name (F1, F2 etc.)
      */
     public void useFont(String internalName) {
         usedFonts.put(internalName, fonts.get(internalName));
     }

     /**
      * Retrieves a (possibly cached) Font instance based on a FontTriplet and a font size.
      * @param triplet the font triplet designating the requested font
      * @param fontSize the font size
      * @return the requested Font instance
      */
     public Font getFontInstance(FontTriplet triplet, int fontSize) {
         Map sizes = (Map)fontInstanceCache.get(triplet);
         if (sizes == null) {
             sizes = new java.util.HashMap();
             fontInstanceCache.put(triplet, sizes);
         }
         Integer size = new Integer(fontSize);
         Font font = (Font)sizes.get(size);
         if (font == null) {
             String fname = getInternalFontKey(triplet);
             useFont(fname);
             FontMetrics metrics = getMetricsFor(fname);
             font = new Font(fname, triplet, metrics, fontSize);
             sizes.put(size, font);
         }
         return font;
     }

     /**
      * Lookup a font.
      * <br>
      * Locate the font name for a given family, style and weight.
      * The font name can then be used as a key as it is unique for
      * the associated document.
      * This also adds the font to the list of used fonts.
      * @param family font family
      * @param style font style
      * @param weight font weight
      * @return the font triplet of the font chosen
      */
     public FontTriplet fontLookup(String family, String style,
                              int weight) {
         return fontLookup(family, style, weight, true);
     }

     /**
      * Looks up a set of fonts.
      * <br>
      * Locate the font name(s) for the given families, style and weight.
      * The font name(s) can then be used as a key as they are unique for
      * the associated document.
      * This also adds the fonts to the list of used fonts.
      * @param families  font families (priority list)
      * @param style     font style
      * @param weight    font weight
      * @return the set of font triplets of all supported and chosen font-families
      *          in the specified style and weight.
      */
     public FontTriplet[] fontLookup(String[] families, String style,
                              int weight) {
         if (families.length == 0) {
             throw new IllegalArgumentException("Specify at least one font family");
         }
         FontTriplet triplet;
         List tmpTriplets = new ArrayList();
         for (int i = 0, c = families.length; i < c; i++) {
             triplet = fontLookup(families[i], style, weight, (i >= families.length - 1));
             if (triplet != null) {
                 tmpTriplets.add(triplet);
             }
         }
         if (tmpTriplets.size() != 0) {
             return (FontTriplet[]) tmpTriplets.toArray(TRIPLETS_TYPE);
         }
         StringBuffer sb = new StringBuffer();
         for (int i = 0, c = families.length; i < c; i++) {
             if (i > 0) {
                 sb.append(", ");
             }
             sb.append(families[i]);
         }
         throw new IllegalStateException(
                     "fontLookup must return an array with at least one "
                     + "FontTriplet on the last call. Lookup: " + sb.toString());
     }

     private void notifyFontReplacement(FontTriplet replacedKey, FontTriplet newKey) {
         if (loggedFontKeys == null) {
             loggedFontKeys = new java.util.HashSet();
         }
         if (!loggedFontKeys.contains(replacedKey)) {
             loggedFontKeys.add(replacedKey);
             log.warn("Font '" + replacedKey + "' not found. "
                     + "Substituting with '" + newKey + "'.");
         }
     }

     /**
      * Find a font with a given family and style by trying
      * different font weights according to the spec.
      * @param family font family
      * @param style font style
      * @param weight font weight
      * @return internal key
      */
     public FontTriplet findAdjustWeight(String family, String style,
                              int weight) {
         FontTriplet key = null;
         String f = null;
         int newWeight = weight;
         if (newWeight < 400) {
             while (f == null && newWeight > 100) {
                 newWeight -= 100;
                 key = createFontKey(family, style, newWeight);
                 f = getInternalFontKey(key);
             }
             newWeight = weight;
             while (f == null && newWeight < 400) {
                 newWeight += 100;
                 key = createFontKey(family, style, newWeight);
                 f = getInternalFontKey(key);
             }
         } else if (newWeight == 500) {
             key = createFontKey(family, style, 400);
             f = getInternalFontKey(key);
         } else if (newWeight > 500) {
             while (f == null && newWeight < 1000) {
                 newWeight += 100;
                 key = createFontKey(family, style, newWeight);
                 f = getInternalFontKey(key);
             }
             newWeight = weight;
             while (f == null && newWeight > 400) {
                 newWeight -= 100;
                 key = createFontKey(family, style, newWeight);
                 f = getInternalFontKey(key);
             }
         }
         if (f == null && weight != 400) {
             key = createFontKey(family, style, 400);
             f = getInternalFontKey(key);
         }

         if (f != null) {
             return key;
         } else {
             return null;
         }
     }

     /**
      * Determines if a particular font is available.
      * @param family font family
      * @param style font style
      * @param weight font weight
      * @return True if available
      */
     public boolean hasFont(String family, String style, int weight) {
         FontTriplet key = createFontKey(family, style, weight);
         return this.triplets.containsKey(key);
     }

     /**
      * Returns the internal font key (F1, F2, F3 etc.) for a given triplet.
      * @param triplet the font triplet
      * @return the associated internal key or null, if not found
      */
     public String getInternalFontKey(FontTriplet triplet) {
         return (String)triplets.get(triplet);
     }

     /**
      * Creates a key from the given strings.
      * @param family font family
      * @param style font style
      * @param weight font weight
      * @return internal key
      */
     public static FontTriplet createFontKey(String family, String style,
                                        int weight) {
         return new FontTriplet(family, style, weight);
     }

     /**
      * Gets a Map of all registered fonts.
      * @return a read-only Map with font key/FontMetrics pairs
      */
     public Map getFonts() {
         return java.util.Collections.unmodifiableMap(this.fonts);
     }

     /**
      * Gets a Map of all registered font triplets.
      * @return a read-only Map with FontTriplet/font key pairs
      */
     public Map getFontTriplets() {
         return java.util.Collections.unmodifiableMap(this.triplets);
     }

     /**
      * This is used by the renderers to retrieve all the
      * fonts used in the document.
      * This is for embedded font or creating a list of used fonts.
      * @return a read-only Map with font key/FontMetrics pairs
      */
     public Map getUsedFonts() {
         return this.usedFonts;
     }

     /**
      * Returns the FontMetrics for a particular font
      * @param fontName internal key
      * @return font metrics
      */
     public FontMetrics getMetricsFor(String fontName) {
         FontMetrics metrics = (FontMetrics)fonts.get(fontName);
         usedFonts.put(fontName, metrics);
         return metrics;
     }

     /**
      * Returns the first triplet matching the given font name.
      * As there may be multiple triplets matching the font name
      * the result set is sorted first to guarantee consistent results.
      * @param fontName The font name we are looking for
      * @return The first triplet for the given font name
      */
     public FontTriplet getTripletFor(String fontName) {
         List foundTriplets = new ArrayList();
         for (Iterator iter = triplets.entrySet().iterator(); iter.hasNext();) {
             Map.Entry tripletEntry = (Map.Entry) iter.next();
             if (fontName.equals(((String)tripletEntry.getValue()))) {
                 foundTriplets.add(tripletEntry.getKey());
             }
         }
         if (foundTriplets.size() > 0) {
             Collections.sort(foundTriplets);
             return (FontTriplet)foundTriplets.get(0);
         }
         return null;
     }

     /**
      * Returns the font style for a particular font.
      * There may be multiple font styles matching this font. Only the first
      * found is returned. Searching is done on a sorted list to guarantee consistent
      * results.
      * @param fontName internal key
      * @return font style
      */
     public String getFontStyleFor(String fontName) {
         FontTriplet triplet = getTripletFor(fontName);
         if (triplet != null) {
             return triplet.getStyle();
         } else {
             return "";
         }
     }

     /**
      * Returns the font weight for a particular font.
      * There may be multiple font weights matching this font. Only the first
      * found is returned. Searching is done on a sorted list to guarantee consistent
      * results.
      * @param fontName internal key
      * @return font weight
      */
     public int getFontWeightFor(String fontName) {
         FontTriplet triplet = getTripletFor(fontName);
         if (triplet != null) {
             return triplet.getWeight();
         } else {
             return 0;
         }
     }

     /**
      * Diagnostic method for logging all registered fonts to System.out.
      */
     public void dumpAllTripletsToSystemOut() {
         Collection entries = new java.util.TreeSet();
         Iterator iter = this.triplets.keySet().iterator();
         while (iter.hasNext()) {
             FontTriplet triplet = (FontTriplet)iter.next();
             String key = getInternalFontKey(triplet);
             FontMetrics metrics = getMetricsFor(key);
             entries.add(triplet.toString() + " -> " + key + " -> " + metrics.getFontName());
         }
         iter = entries.iterator();
         while (iter.hasNext()) {
             System.out.println(iter.next());
         }
     }
 }
	/*
	* Licensed to the Apache Software Foundation (ASF) under one or more
	* contributor license agreements. See the NOTICE file distributed with
	* this work for additional information regarding copyright ownership.
	* The ASF licenses this file to You under the Apache License, Version 2.0
	* (the "License"); you may not use this file except in compliance with
	* the License. You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	/* $Id$ */

	package org.apache.fop.fonts;

	import java.util.ArrayList;
	import java.util.Collection;
	import java.util.Collections;
	import java.util.Iterator;
	import java.util.List;
	import java.util.Map;

	import org.apache.commons.logging.Log;
	import org.apache.commons.logging.LogFactory;


	/**
	* The FontInfo for the layout and rendering of a fo document.
	* This stores the list of available fonts that are setup by
	* the renderer. The font name can be retrieved for the
	* family style and weight.
	* <br>
	* Currently font supported font-variant small-caps is not
	* implemented.
	*/
	public class FontInfo {

	private static final FontTriplet[] TRIPLETS_TYPE = new FontTriplet[1];

	/** logging instance */
	protected static Log log = LogFactory.getLog(FontInfo.class);

	/** Map containing fonts that have been used */
	private Map usedFonts; //Map<String,FontMetrics> (String = font key)

	/** look up a font-triplet to find a font-name */
	private Map triplets; //Map<FontTriplet,String> (String = font key)

	/** look up a font-triplet to find its priority
	* (only used inside addFontProperties()) */
	private Map tripletPriorities; //Map<FontTriplet,Integer>

	/** look up a font-name to get a font (that implements FontMetrics at least) */
	private Map fonts; //Map<String,FontMetrics> (String = font key)

	/** collection of missing fonts; used to make sure the user gets
	* a warning for a missing font only once (not every time the font is used)
	*/
	private Collection loggedFontKeys;

	/** Cache for Font instances. */
	private Map fontInstanceCache = new java.util.HashMap();

	/**
	* Main constructor
	*/
	public FontInfo() {
	this.triplets = new java.util.HashMap();
	this.tripletPriorities = new java.util.HashMap();
	this.fonts = new java.util.HashMap();
	this.usedFonts = new java.util.HashMap();
	}

	/**
	* Checks if the font setup is valid (At least the ultimate fallback font
	* must be registered.)
	* @return True if valid
	*/
	public boolean isSetupValid() {
	//We're only called when font setup is done:
	tripletPriorities = null; // candidate for garbage collection
	return triplets.containsKey(Font.DEFAULT_FONT);
	}

	/**
	* Adds a new font triplet.
	* @param name internal key
	* @param family font family name
	* @param style font style (normal, italic, oblique...)
	* @param weight font weight
	*/
	public void addFontProperties(String name, String family, String style, int weight) {
	addFontProperties(name, createFontKey(family, style, weight));
	}

	/**
	* Adds a new font triplet.
	* @param name internal key
	* @param triplet the font triplet to associate with the internal key
	*/
	public void addFontProperties(String name, FontTriplet triplet) {
	/*
	* add the given family, style and weight as a lookup for the font
	* with the given name
	*/
	if (log.isDebugEnabled()) {
	log.debug("Registering: " + triplet + " under " + name);
	}
	String oldName = (String)triplets.get(triplet);
	int newPriority = triplet.getPriority();
	if (oldName != null) {
	int oldPriority = ((Integer)tripletPriorities.get(triplet)).intValue();
	if (oldPriority < newPriority) {
	logDuplicateFont(triplet, false, oldName, oldPriority,
	name, newPriority);
	return;
	} else {
	logDuplicateFont(triplet, true, oldName, oldPriority,
	name, newPriority);
	}
	}
	this.triplets.put(triplet, name);
	this.tripletPriorities.put(triplet, new Integer(newPriority));
	}

	/** Log warning about duplicate font triplets.
	* @param triplet the duplicate font triplet
	* @param replacing true iff the new font will replace the old one
	* @param oldKey the old internal font name
	* @param oldPriority the priority of the existing font mapping
	* @param newKey the new internal font name
	* @param newPriority the priority of the duplicate font mapping
	*/
	private void logDuplicateFont(FontTriplet triplet, boolean replacing,
	String oldKey, int oldPriority,
	String newKey, int newPriority) {
	if (log.isDebugEnabled()) {
	log.debug(triplet
	+ (replacing ? ": Replacing " : ": Not replacing ")
	+ ((FontMetrics)fonts.get(triplets.get(triplet))).getFullName()
	+ " (" + oldPriority + ") by "
	+ ((FontMetrics)fonts.get(newKey)).getFullName()
	+ " (" + newPriority + ")");
	}
	}

	/**
	* Adds font metrics for a specific font.
	* @param name internal key
	* @param metrics metrics to register
	*/
	public void addMetrics(String name, FontMetrics metrics) {
	// add the given metrics as a font with the given name

	this.fonts.put(name, metrics);
	}

	/**
	* Lookup a font.
	* <br>
	* Locate the font name for a given family, style and weight.
	* The font name can then be used as a key as it is unique for
	* the associated document.
	* This also adds the font to the list of used fonts.
	* @param family font family
	* @param style font style
	* @param weight font weight
	* @param substFont true if the font may be substituted with the
	* default font if not found
	* @return internal key
	*/
	private FontTriplet fontLookup(String family, String style,
	int weight, boolean substFont) {
	if (log.isTraceEnabled()) {
	log.trace("Font lookup: " + family + " " + style + " " + weight);
	}
	FontTriplet startKey = createFontKey(family, style, weight);
	FontTriplet key = startKey;
	// first try given parameters
	String f = getInternalFontKey(key);
	if (f == null) {
	key = doAdjustedLookup(family, style, weight, startKey, substFont);
	}

	if (key != null) {
	if (key != startKey) {
	notifyFontReplacement(startKey, key);
	}
	return key;
	} else {
	return null;
	}
	}

	private FontTriplet doAdjustedLookup(String family, String style,
	int weight, FontTriplet startKey, boolean substFont) {
	FontTriplet key;
	String f;
	if (!family.equals(startKey.getName())) {
	key = createFontKey(family, style, weight);
	f = getInternalFontKey(key);
	if (f != null) {
	return key;
	}
	}

	// adjust weight, favouring normal or bold
	key = findAdjustWeight(family, style, weight);
	f = getInternalFontKey(key);

	if (!substFont && f == null) {
	return null;
	}

	// only if the font may be substituted
	// fallback 1: try the same font-family and weight with default style
	if (f == null && style != Font.STYLE_NORMAL) {
	key = createFontKey(family, Font.STYLE_NORMAL, weight);
	f = getInternalFontKey(key);
	}

	if (f == null && weight != Font.WEIGHT_NORMAL) {
	int diffWeight = (Font.WEIGHT_NORMAL - weight) / 100;
	int direction = diffWeight > 0 ? 1 : -1;
	int tryWeight = weight;
	while (tryWeight != Font.WEIGHT_NORMAL) {
	tryWeight += 100 * direction;
	key = createFontKey(family, style, weight);
	f = getInternalFontKey(key);
	if (f == null) {
	key = createFontKey(family, Font.STYLE_NORMAL, weight);
	f = getInternalFontKey(key);
	}
	if (f != null) {
	break;
	}
	}
	}

	// fallback 2: try the same font-family with default style and weight
	/* obsolete: replaced by the loop above
	if (f == null) {
	key = createFontKey(family, Font.STYLE_NORMAL, Font.WEIGHT_NORMAL);
	f = getInternalFontKey(key);
	}*/

	// fallback 3: try any family with orig style/weight
	if (f == null) {
	return doAdjustedLookup("any", style, weight, startKey, false);
	}

	// last resort: use default
	if (f == null) {
	key = Font.DEFAULT_FONT;
	f = getInternalFontKey(key);
	}

	if (f != null) {
	return key;
	} else {
	return null;
	}
	}

	/**
	* Tells this class that the font with the given internal name has been used.
	* @param internalName the internal font name (F1, F2 etc.)
	*/
	public void useFont(String internalName) {
	usedFonts.put(internalName, fonts.get(internalName));
	}

	/**
	* Retrieves a (possibly cached) Font instance based on a FontTriplet and a font size.
	* @param triplet the font triplet designating the requested font
	* @param fontSize the font size
	* @return the requested Font instance
	*/
	public Font getFontInstance(FontTriplet triplet, int fontSize) {
	Map sizes = (Map)fontInstanceCache.get(triplet);
	if (sizes == null) {
	sizes = new java.util.HashMap();
	fontInstanceCache.put(triplet, sizes);
	}
	Integer size = new Integer(fontSize);
	Font font = (Font)sizes.get(size);
	if (font == null) {
	String fname = getInternalFontKey(triplet);
	useFont(fname);
	FontMetrics metrics = getMetricsFor(fname);
	font = new Font(fname, triplet, metrics, fontSize);
	sizes.put(size, font);
	}
	return font;
	}

	/**
	* Lookup a font.
	* <br>
	* Locate the font name for a given family, style and weight.
	* The font name can then be used as a key as it is unique for
	* the associated document.
	* This also adds the font to the list of used fonts.
	* @param family font family
	* @param style font style
	* @param weight font weight
	* @return the font triplet of the font chosen
	*/
	public FontTriplet fontLookup(String family, String style,
	int weight) {
	return fontLookup(family, style, weight, true);
	}

	/**
	* Looks up a set of fonts.
	* <br>
	* Locate the font name(s) for the given families, style and weight.
	* The font name(s) can then be used as a key as they are unique for
	* the associated document.
	* This also adds the fonts to the list of used fonts.
	* @param families font families (priority list)
	* @param style font style
	* @param weight font weight
	* @return the set of font triplets of all supported and chosen font-families
	* in the specified style and weight.
	*/
	public FontTriplet[] fontLookup(String[] families, String style,
	int weight) {
	if (families.length == 0) {
	throw new IllegalArgumentException("Specify at least one font family");
	}
	FontTriplet triplet;
	List tmpTriplets = new ArrayList();
	for (int i = 0, c = families.length; i < c; i++) {
	triplet = fontLookup(families[i], style, weight, (i >= families.length - 1));
	if (triplet != null) {
	tmpTriplets.add(triplet);
	}
	}
	if (tmpTriplets.size() != 0) {
	return (FontTriplet[]) tmpTriplets.toArray(TRIPLETS_TYPE);
	}
	StringBuffer sb = new StringBuffer();
	for (int i = 0, c = families.length; i < c; i++) {
	if (i > 0) {
	sb.append(", ");
	}
	sb.append(families[i]);
	}
	throw new IllegalStateException(
	"fontLookup must return an array with at least one "
	+ "FontTriplet on the last call. Lookup: " + sb.toString());
	}

	private void notifyFontReplacement(FontTriplet replacedKey, FontTriplet newKey) {
	if (loggedFontKeys == null) {
	loggedFontKeys = new java.util.HashSet();
	}
	if (!loggedFontKeys.contains(replacedKey)) {
	loggedFontKeys.add(replacedKey);
	log.warn("Font '" + replacedKey + "' not found. "
	+ "Substituting with '" + newKey + "'.");
	}
	}

	/**
	* Find a font with a given family and style by trying
	* different font weights according to the spec.
	* @param family font family
	* @param style font style
	* @param weight font weight
	* @return internal key
	*/
	public FontTriplet findAdjustWeight(String family, String style,
	int weight) {
	FontTriplet key = null;
	String f = null;
	int newWeight = weight;
	if (newWeight < 400) {
	while (f == null && newWeight > 100) {
	newWeight -= 100;
	key = createFontKey(family, style, newWeight);
	f = getInternalFontKey(key);
	}
	newWeight = weight;
	while (f == null && newWeight < 400) {
	newWeight += 100;
	key = createFontKey(family, style, newWeight);
	f = getInternalFontKey(key);
	}
	} else if (newWeight == 500) {
	key = createFontKey(family, style, 400);
	f = getInternalFontKey(key);
	} else if (newWeight > 500) {
	while (f == null && newWeight < 1000) {
	newWeight += 100;
	key = createFontKey(family, style, newWeight);
	f = getInternalFontKey(key);
	}
	newWeight = weight;
	while (f == null && newWeight > 400) {
	newWeight -= 100;
	key = createFontKey(family, style, newWeight);
	f = getInternalFontKey(key);
	}
	}
	if (f == null && weight != 400) {
	key = createFontKey(family, style, 400);
	f = getInternalFontKey(key);
	}

	if (f != null) {
	return key;
	} else {
	return null;
	}
	}

	/**
	* Determines if a particular font is available.
	* @param family font family
	* @param style font style
	* @param weight font weight
	* @return True if available
	*/
	public boolean hasFont(String family, String style, int weight) {
	FontTriplet key = createFontKey(family, style, weight);
	return this.triplets.containsKey(key);
	}

	/**
	* Returns the internal font key (F1, F2, F3 etc.) for a given triplet.
	* @param triplet the font triplet
	* @return the associated internal key or null, if not found
	*/
	public String getInternalFontKey(FontTriplet triplet) {
	return (String)triplets.get(triplet);
	}

	/**
	* Creates a key from the given strings.
	* @param family font family
	* @param style font style
	* @param weight font weight
	* @return internal key
	*/
	public static FontTriplet createFontKey(String family, String style,
	int weight) {
	return new FontTriplet(family, style, weight);
	}

	/**
	* Gets a Map of all registered fonts.
	* @return a read-only Map with font key/FontMetrics pairs
	*/
	public Map getFonts() {
	return java.util.Collections.unmodifiableMap(this.fonts);
	}

	/**
	* Gets a Map of all registered font triplets.
	* @return a read-only Map with FontTriplet/font key pairs
	*/
	public Map getFontTriplets() {
	return java.util.Collections.unmodifiableMap(this.triplets);
	}

	/**
	* This is used by the renderers to retrieve all the
	* fonts used in the document.
	* This is for embedded font or creating a list of used fonts.
	* @return a read-only Map with font key/FontMetrics pairs
	*/
	public Map getUsedFonts() {
	return this.usedFonts;
	}

	/**
	* Returns the FontMetrics for a particular font
	* @param fontName internal key
	* @return font metrics
	*/
	public FontMetrics getMetricsFor(String fontName) {
	FontMetrics metrics = (FontMetrics)fonts.get(fontName);
	usedFonts.put(fontName, metrics);
	return metrics;
	}

	/**
	* Returns the first triplet matching the given font name.
	* As there may be multiple triplets matching the font name
	* the result set is sorted first to guarantee consistent results.
	* @param fontName The font name we are looking for
	* @return The first triplet for the given font name
	*/
	public FontTriplet getTripletFor(String fontName) {
	List foundTriplets = new ArrayList();
	for (Iterator iter = triplets.entrySet().iterator(); iter.hasNext();) {
	Map.Entry tripletEntry = (Map.Entry) iter.next();
	if (fontName.equals(((String)tripletEntry.getValue()))) {
	foundTriplets.add(tripletEntry.getKey());
	}
	}
	if (foundTriplets.size() > 0) {
	Collections.sort(foundTriplets);
	return (FontTriplet)foundTriplets.get(0);
	}
	return null;
	}

	/**
	* Returns the font style for a particular font.
	* There may be multiple font styles matching this font. Only the first
	* found is returned. Searching is done on a sorted list to guarantee consistent
	* results.
	* @param fontName internal key
	* @return font style
	*/
	public String getFontStyleFor(String fontName) {
	FontTriplet triplet = getTripletFor(fontName);
	if (triplet != null) {
	return triplet.getStyle();
	} else {
	return "";
	}
	}

	/**
	* Returns the font weight for a particular font.
	* There may be multiple font weights matching this font. Only the first
	* found is returned. Searching is done on a sorted list to guarantee consistent
	* results.
	* @param fontName internal key
	* @return font weight
	*/
	public int getFontWeightFor(String fontName) {
	FontTriplet triplet = getTripletFor(fontName);
	if (triplet != null) {
	return triplet.getWeight();
	} else {
	return 0;
	}
	}

	/**
	* Diagnostic method for logging all registered fonts to System.out.
	*/
	public void dumpAllTripletsToSystemOut() {
	Collection entries = new java.util.TreeSet();
	Iterator iter = this.triplets.keySet().iterator();
	while (iter.hasNext()) {
	FontTriplet triplet = (FontTriplet)iter.next();
	String key = getInternalFontKey(triplet);
	FontMetrics metrics = getMetricsFor(key);
	entries.add(triplet.toString() + " -> " + key + " -> " + metrics.getFontName());
	}
	iter = entries.iterator();
	while (iter.hasNext()) {
	System.out.println(iter.next());
	}
	}
	}