org.hibernate.internal.util.xml.XMLHelper.java Source code

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Here is the source code for org.hibernate.internal.util.xml.XMLHelper.java

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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
 */
package org.hibernate.internal.util.xml;

import java.security.AccessController;
import java.security.PrivilegedAction;

import org.dom4j.DocumentFactory;
import org.dom4j.io.SAXReader;
import org.xml.sax.EntityResolver;

/**
 * Small helper class that lazy loads DOM and SAX reader and keep them for fast use afterwards.
 *
 * @deprecated Currently only used for integration with HCANN.  The rest of Hibernate uses StAX now
 * for XML processing.  See {@link org.hibernate.boot.jaxb.internal.stax}
 */
@Deprecated
public final class XMLHelper {
    private final DocumentFactory documentFactory;

    public XMLHelper() {
        PrivilegedAction<DocumentFactory> action = new PrivilegedAction<DocumentFactory>() {
            public DocumentFactory run() {
                final ClassLoader originalTccl = Thread.currentThread().getContextClassLoader();
                try {
                    // We need to make sure we get DocumentFactory
                    // loaded from the same ClassLoader that loads
                    // Hibernate classes, to make sure we get the
                    // proper version of DocumentFactory, This class
                    // is "internal", and should only be used for XML
                    // files generated by Envers.

                    // Using the (Hibernate) ClassLoader that loads
                    // this Class will avoid collisions in the case
                    // that DocumentFactory can be loaded from,
                    // for example, the application ClassLoader.
                    Thread.currentThread().setContextClassLoader(this.getClass().getClassLoader());
                    return DocumentFactory.getInstance();
                } finally {
                    Thread.currentThread().setContextClassLoader(originalTccl);
                }
            }
        };

        this.documentFactory = System.getSecurityManager() != null ? AccessController.doPrivileged(action)
                : action.run();
    }

    public DocumentFactory getDocumentFactory() {
        return documentFactory;
    }

    public SAXReader createSAXReader(ErrorLogger errorLogger, EntityResolver entityResolver) {
        SAXReader saxReader = new SAXReader();
        saxReader.setMergeAdjacentText(true);
        saxReader.setValidation(true);
        saxReader.setErrorHandler(errorLogger);
        saxReader.setEntityResolver(entityResolver);

        return saxReader;
    }
}