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Open HTML to PDF is a CSS 2.1 renderer written in Java. This artifact contains the core rendering and layout code.

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package com.openhtmltopdf.extend;

/**
 * Note: Classes implementing this interface should be thread safe as we document the cache being useable accross threads.
 */
public interface FSCacheValue {
    /**
     * @return the (very) approximate weight of a cache value in bytes if known or -1 otherwise.
     */
    public int weight();
}