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   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
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package org.apache.batik.bridge;

import java.lang.ref.SoftReference;
import java.text.AttributedCharacterIterator;
import java.util.Map;

import org.apache.batik.gvt.font.GVTFont;
import org.apache.batik.gvt.font.GVTFontFace;
import org.apache.batik.gvt.font.GVTFontFamily;
import org.apache.batik.gvt.text.GVTAttributedCharacterIterator;
import org.apache.batik.util.SVGConstants;

import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

 * A font family class for SVG fonts.
 * @author <a href="">Bella Robinson</a>
 * @version $Id: 489226 2006-12-21 00:05:36Z cam $
public class SVGFontFamily implements GVTFontFamily {

    public static final
        AttributedCharacterIterator.Attribute TEXT_COMPOUND_ID =

    protected GVTFontFace fontFace;
    protected Element fontElement;
    protected BridgeContext ctx;
    protected Boolean complex = null;

     * Constructs an SVGFontFamily.
     * @param fontFace The font face object that describes this font family.
     * @param fontElement The element that contains the font data for this family.
     * @param ctx The bridge context. This is required for lazily loading the
     * font data at render time.
    public SVGFontFamily(GVTFontFace fontFace,
                         Element fontElement,
                         BridgeContext ctx) {
        this.fontFace = fontFace;
        this.fontElement = fontElement;
        this.ctx = ctx;

     * Returns the family name of this font.
     * @return The font family name.
    public String getFamilyName() {
        return fontFace.getFamilyName();

     * Returns the font-face associated with this font family.
     * @return The font face.
    public GVTFontFace getFontFace() {
        return fontFace;

     * Derives a GVTFont object of the correct size.
     * @param size The required size of the derived font.
     * @param aci The character iterator containing the text to be rendered
     * using the derived font.
     * @return The derived font.
    public GVTFont deriveFont(float size, AttributedCharacterIterator aci) {
        return deriveFont(size, aci.getAttributes());

     * Derives a GVTFont object of the correct size from an attribute Map.
     * @param size  The required size of the derived font.
     * @param attrs The Attribute Map to get Values from.
    public GVTFont deriveFont(float size, Map attrs) {
        SVGFontElementBridge fontBridge;
        fontBridge = (SVGFontElementBridge)ctx.getBridge(fontElement);
        SoftReference sr = (SoftReference)attrs.get(TEXT_COMPOUND_ID);
        Element textElement = (Element)sr.get();
        return fontBridge.createFont(ctx, fontElement, textElement,
                                     size, fontFace);

     * This method looks at the SVG font and checks if any of
     * the glyphs use renderable child elements.  If so this
     * is a complex font in that full CSS inheritance needs to
     * be applied.  Otherwise if it only uses the 'd' attribute
     * it does not need CSS treatment.
    public boolean isComplex() {
        if (complex != null) return complex.booleanValue();
        boolean ret = isComplex(fontElement, ctx);
        complex = ret ? Boolean.TRUE : Boolean.FALSE;
        return ret;

    public static boolean isComplex(Element fontElement, BridgeContext ctx) {
        NodeList glyphElements = fontElement.getElementsByTagNameNS
            (SVGConstants.SVG_NAMESPACE_URI, SVGConstants.SVG_GLYPH_TAG);

        int numGlyphs = glyphElements.getLength();
        for (int i = 0; i < numGlyphs; i++) {
            Element glyph = (Element)glyphElements.item(i);
            Node child    = glyph.getFirstChild();
            for (;child != null; child = child.getNextSibling()) {
                if (child.getNodeType() != Node.ELEMENT_NODE)
                Element e = (Element)child;
                Bridge b = ctx.getBridge(e);
                if ((b != null) && (b instanceof GraphicsNodeBridge)) {
                    return true;
        return false;
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