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package com.sun.jersey.core.util;

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.SAXParserFactory;

/**
 * @author Michal Gajdos (michal.gajdos at oracle.com)
 */
public final class SaxHelper {

    private SaxHelper() {}

    /**
     * Determines whether the given SAX {@code parserFactory} is from XDK package or not.
     *
     * @param parserFactory SAX parser factory to evaluate.
     * @return {@code true} if the given SAX parser factory is an XDK factory, {@code false} otherwise.
     */
    public static boolean isXdkParserFactory(final SAXParserFactory parserFactory) {
        return isXdkFactory(parserFactory, "oracle.xml.jaxp.JXSAXParserFactory");
    }

    /**
     * Determines whether the given {@code builderFactory} is from XDK package or not.
     *
     * @param builderFactory document builder factory to evaluate.
     * @return {@code true} if the given document builder factory is an XDK factory, {@code false} otherwise.
     */
    public static boolean isXdkDocumentBuilderFactory(final DocumentBuilderFactory builderFactory) {
        return isXdkFactory(builderFactory, "oracle.xml.jaxp.JXDocumentBuilderFactory");
    }

    private static boolean isXdkFactory(final Object factory, final String className) {
        try {
            final Class xdkFactoryClass = Class.forName(className);
            return xdkFactoryClass.isAssignableFrom(factory.getClass());
        } catch (ClassNotFoundException e) {
            // Ignore this.
        }
        return false;
    }
}