// Copyright 2001-2007 freehep
package org.freehep.graphicsio.font;
import com.google.code.appengine.awt.Font;
import com.google.code.appengine.awt.font.TextAttribute;
import java.io.IOException;
import java.util.Collection;
import java.util.Hashtable;
import java.util.Map;
import org.freehep.graphics2d.font.CharTable;
import org.freehep.graphics2d.font.FontUtilities;
import org.freehep.graphics2d.font.Lookup;
/**
* A table to remember which fonts were used while writing a document.
*
* @author Simon Fischer
* @version $Id: FontTable.java 10516 2007-02-06 21:11:19Z duns $
*/
public abstract class FontTable {
protected class Entry {
private Font font;
private String ref;
private CharTable encoding;
private boolean written;
private Entry(Font f, CharTable encoding) {
// get attributes of font for the stored default font
Map/*<TextAttribute,?>*/ attributes = FontUtilities.getAttributes(f);
// set default font size
attributes.put(TextAttribute.SIZE, new Float(FontEmbedder.FONT_SIZE));
// remove font transformations
attributes.remove(TextAttribute.TRANSFORM);
attributes.remove(TextAttribute.SUPERSCRIPT);
this.font = new Font(attributes);
this.ref = createFontReference(this.font);
this.encoding = encoding;
this.written = false;
}
public Font getFont() {
return font;
}
public String getReference() {
return ref;
}
protected void setReference(String ref) {
this.ref = ref;
}
public CharTable getEncoding() {
return encoding;
}
public void setWritten(boolean written) {
this.written = written;
}
public boolean isWritten() {
return written;
}
public String toString() {
return ref + "=" + font;
}
}
private Hashtable table;
public FontTable() {
this.table = new Hashtable();
}
/**
* Returns a default CharTable to be used for normal text (not Symbol or
* Dingbats).
*/
public abstract CharTable getEncodingTable();
/**
* Called whenever a specific font is used for the first time. Subclasses
* may use this method to include the font instantly. This method may change
* the value of the reference by calling <tt>e.setReference(String)</tt>
* e.g. if it wants to substitute the font by a standard font that can be
* addressed under a name different from the generated one.
*/
protected abstract void firstRequest(Entry e, boolean embed, String embedAs)
throws IOException;
/** Creates a unique reference to address this font. */
protected abstract String createFontReference(Font f);
protected abstract Font substituteFont(Font font);
/**
* Returns a name for this font that can be used in the document. A new name
* is generated if the font was not used yet. For different fontsizes the
* same name is returned.
*/
public String fontReference(Font font, boolean embed, String embedAs) {
// look for stored font
font = substituteFont(font);
String key = getKey(font);
Entry e = (Entry) table.get(key);
// create new one
if (e == null) {
e = new Entry(font, getEncodingTable(font));
try {
firstRequest(e, embed, embedAs);
} catch (IOException exc) {
exc.printStackTrace();
}
table.put(key, e);
}
return e.ref;
}
/**
* To embed all derivations of a font too (with underline,
* strikethrough etc.) the key consists all these attributes.
*
* @param font ist attributes are used
* @return something like Helvetica[BOLD:1][ITALIC:0][UNDERLINE:1]
*/
private String getKey(Font font) {
Map/*<TextAttribute,?>*/ attributes = FontUtilities.getAttributes(font);
StringBuffer result = new StringBuffer(font.getName());
// bold
result.append("[WEIGHT:");
result.append(attributes.get(TextAttribute.WEIGHT));
result.append("]");
// italic
result.append("[POSTURE:");
result.append(attributes.get(TextAttribute.POSTURE));
result.append("]");
// underline is not handled as an font property
// result.append("[UNDERLINE:");
// result.append(attributes.get(TextAttribute.UNDERLINE));
// result.append("]");
// strike through is not handled as an font property
// result.append("[STRIKETHROUGH:");
// result.append(attributes.get(TextAttribute.STRIKETHROUGH));
// result.append("]");
// SUPERSCRIPT is apllied by font.getTransformation()
// leave this as a reminder!
// result.append("[");
// result.append(attributes.get(TextAttribute.SUPERSCRIPT));
// result.append("]");
// width is not handled as an font property
// result.append("[WIDTH:");
// result.append(attributes.get(TextAttribute.WIDTH));
// result.append("]");
return result.toString();
}
/**
* creates a normalized attribute map, e.g.
* com.google.code.appengine.awt.Font[family=Dialog,name=dialog.bold,style=plain,size=20]
* becomes
* com.google.code.appengine.awt.Font[family=Dialog,name=Dialog,style=bold,size=20]
*
* @param attributes
*/
public static void normalize(Map/*<TextAttribute,?>*/ attributes) {
// get name
String family = (String) attributes.get(TextAttribute.FAMILY);
// Java font names could end with ".plain" ".bold"
// and ".italic". We have to convert this to an
// attribute first
if (family.toLowerCase().endsWith(".bold")) {
attributes.put(TextAttribute.WEIGHT, TextAttribute.WEIGHT_BOLD);
// cut the ".bold"
int pos = family.toLowerCase().indexOf(".bold");
family = family.substring(0, pos);
} else if (family.toLowerCase().endsWith(".italic")) {
attributes.put(TextAttribute.POSTURE, TextAttribute.POSTURE_OBLIQUE);
// cut the ".italic"
int pos = family.toLowerCase().indexOf(".italic");
family = family.substring(0, pos);
} else if (family.toLowerCase().endsWith(".plain")) {
// cut the ".plain"
int pos = family.toLowerCase().indexOf(".plain");
family = family.substring(0, pos);
}
// first character up
family = family.substring(0, 1).toUpperCase() + family.substring(1, family.length());
attributes.put(TextAttribute.FAMILY, family);
}
/**
* Returns a Collection view of all fonts. The elements of the collection
* are <tt>Entrie</tt>s.
*/
public Collection getEntries() {
return table.values();
}
private CharTable getEncodingTable(Font font) {
String fontname = font.getName().toLowerCase();
if (fontname.indexOf("symbol") >= 0)
return Lookup.getInstance().getTable("Symbol");
if (fontname.indexOf("zapfdingbats") >= 0)
return Lookup.getInstance().getTable("Zapfdingbats");
return getEncodingTable();
}
}