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Flying Saucer is a CSS 2.1 renderer written in Java. This artifact contains the core rendering and layout code as well as Java2D output.

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package org.xhtmlrenderer.context;

import org.xhtmlrenderer.css.sheet.Stylesheet;

import java.util.LinkedHashMap;
import java.util.Map;

class StylesheetCache extends LinkedHashMap {
    private static final int cacheCapacity = 16;

    StylesheetCache() {
        super(cacheCapacity,  0.75f, true);
    }

    @Override
    protected boolean removeEldestEntry(Map.Entry eldest) {
        return size() > cacheCapacity;
    }
}