/*****************************************************************************
* Copyright (C) The Apache Software Foundation. All rights reserved. *
* ------------------------------------------------------------------------- *
* This software is published under the terms of the Apache Software License *
* version 1.1, a copy of which has been included with this distribution in *
* the LICENSE file. *
*****************************************************************************/
package org.apache.batik.bridge;
import java.awt.font.FontRenderContext;
import java.text.AttributedCharacterIterator;
import org.apache.batik.gvt.font.AltGlyphHandler;
import org.apache.batik.gvt.font.GVTGlyphVector;
import org.apache.batik.gvt.font.Glyph;
import org.apache.batik.gvt.font.SVGGVTGlyphVector;
import org.apache.batik.util.SVGConstants;
import org.w3c.dom.Element;
/**
* SVG font altGlyph handler. This class handles the creation of an alternate
* GVTGlyphVector for the altGlyph element.
*
* @author <a href="mailto:bella.robinson@cmis.csiro.au">Bella Robinson</a>
* @version $Id: SVGAltGlyphHandler.java,v 1.6 2003/04/11 13:54:44 vhardy Exp $
*/
public class SVGAltGlyphHandler implements AltGlyphHandler, SVGConstants {
private BridgeContext ctx;
private Element textElement;
/**
* Constructs an SVGAltGlyphHandler.
*
* @param ctx The bridge context, this is needed during rendering to find
* any referenced glyph elements.
* @param textElement The element that contains text to be replaced by the
* alternate glyphs. This should be an altGlyph element.
*/
public SVGAltGlyphHandler(BridgeContext ctx, Element textElement) {
this.ctx = ctx;
this.textElement = textElement;
}
/**
* Creates a glyph vector containing the alternate glyphs.
*
* @param frc The current font render context.
* @param fontSize The required font size.
* @return The GVTGlyphVector containing the alternate glyphs, or null if
* the alternate glyphs could not be found.
*/
public GVTGlyphVector createGlyphVector(FontRenderContext frc, float fontSize,
AttributedCharacterIterator aci) {
try {
if (textElement.getTagName().equals(SVG_ALT_GLYPH_TAG)) {
SVGAltGlyphElementBridge altGlyphBridge
= (SVGAltGlyphElementBridge)ctx.getBridge(textElement);
Glyph[] glyphArray
= altGlyphBridge.createAltGlyphArray(ctx, textElement, fontSize, aci);
if (glyphArray != null) {
return new SVGGVTGlyphVector(null, glyphArray, frc);
}
}
} catch (SecurityException e) {
ctx.getUserAgent().displayError(e);
// Throw exception because we do not want to continue
// processing. In the case of a SecurityException, the
// end user would get a lot of exception like this one.
throw e;
}
return null;
}
}