SimpleFontLocator.java

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package com.adobe.dp.otf;

import java.io.File;
import java.io.IOException;
import java.util.Hashtable;
import java.util.Iterator;

public abstract class SimpleFontLocator extends FontLocator {

	private Hashtable fontMap;

	protected SimpleFontLocator() {
	}
	
	protected void init() {
		fontMap = new Hashtable();
		collectFonts(fontMap);
	}

	abstract protected Iterator getStreamNames();

	abstract protected FontInputStream getStream(String name)
			throws IOException;

	protected void collectFonts(Hashtable map) {
		Iterator streams = getStreamNames();
		while (streams.hasNext()) {
			String name = (String) streams.next();
			try {
				FontInputStream in = getStream(name);
				if (in == null)
					continue;
                OpenTypeFont font;
                try {
                    font = new OpenTypeFont(in, true);
                } finally {
                    in.close();
                }
                if (!font.canEmbedForReading())
					continue;
				FontProperties key = new FontProperties(font.getFamilyName(),
						font.getWeight(), font.getStyle());
				map.put(key, name);
				System.out.println(name + ": " + key);
			} catch (Exception e) {
				// ignore
				// System.out.println(name + ": " + e);
			}
		}
	}

	FontProperties substitute(FontProperties key) {
		
		/*
		if ( key.getFamilyName().equals("Tahoma")) {
			// substitute Tahoma with Calibri
			key = new FontProperties("Calibri", key.getWeight(), key.getStyle());
		}
		*/
		
		if (key.getStyle() == FontPropertyConstants.STYLE_ITALIC
				&& key.getFamilyName().equals("Tahoma")) {
			// workaround: Tahoma does not have italic, replace with Verdana
			key = new FontProperties("Verdana", key.getWeight(), key.getStyle());
		}
		return key;
	}
	
	public boolean hasFont(FontProperties key) {
		key = substitute(key);
		String fileName = (String) fontMap.get(key);
		if (fileName == null) {
			// try a bit bolder...
			FontProperties key1 = new FontProperties(key.getFamilyName(), key
					.getWeight() + 100, key.getStyle());
			fileName = (String) fontMap.get(key1);
			if (fileName == null) {
				// ...and a bit lighter
				key1 = new FontProperties(key.getFamilyName(),
						key.getWeight() - 100, key.getStyle());
				fileName = (String) fontMap.get(key);
				if (fileName == null)
					return false;
			}
		}
		return true;
	}

	public FontInputStream locateFont(FontProperties key) throws IOException {
		key = substitute(key);
		String fileName = (String) fontMap.get(key);
		if (fileName == null) {
			// try a bit bolder...
			FontProperties key1 = new FontProperties(key.getFamilyName(), key
					.getWeight() + 100, key.getStyle());
			fileName = (String) fontMap.get(key1);
			if (fileName == null) {
				// ...and a bit lighter
				key1 = new FontProperties(key.getFamilyName(),
						key.getWeight() - 100, key.getStyle());
				fileName = (String) fontMap.get(key);
				if (fileName == null)
					return null;
			}
		}
		File file = new File(fileName);
		if (!file.canRead())
			return null;
		return getStream(fileName);
	}

}