org.sakaiproject.metaobj.shared.model.impl.HibernateStructuredArtifact.java Source code

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Here is the source code for org.sakaiproject.metaobj.shared.model.impl.HibernateStructuredArtifact.java

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/**********************************************************************************
 * $URL: https://source.sakaiproject.org/svn/metaobj/trunk/metaobj-impl/api-impl/src/java/org/sakaiproject/metaobj/shared/model/impl/HibernateStructuredArtifact.java $
 * $Id: HibernateStructuredArtifact.java 120216 2013-02-18 19:44:04Z ottenhoff@longsight.com $
 ***********************************************************************************
 *
 * Copyright (c) 2004, 2005, 2006, 2008 The Sakai Foundation
 *
 * Licensed under the Educational Community License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.opensource.org/licenses/ECL-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 **********************************************************************************/

package org.sakaiproject.metaobj.shared.model.impl;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.Serializable;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.HibernateException;
import org.hibernate.usertype.UserType;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import org.jdom.output.XMLOutputter;
import org.sakaiproject.component.cover.ComponentManager;
import org.sakaiproject.metaobj.shared.mgt.HomeFactory;
import org.sakaiproject.metaobj.shared.mgt.WritableObjectHome;
import org.sakaiproject.metaobj.shared.model.StructuredArtifact;

public class HibernateStructuredArtifact extends StructuredArtifact implements UserType {
    protected final Log logger = LogFactory.getLog(getClass());
    private final static int[] SQL_TYPES = new int[] { Types.BLOB };

    public HibernateStructuredArtifact() {
    }

    public int[] sqlTypes() {
        return SQL_TYPES;
    }

    /* (non-Javadoc)
     * @see org.hibernate.UserType#deepCopy(java.lang.Object)
     */
    public Object deepCopy(Object arg0) throws HibernateException {
        return arg0;
    }

    /* (non-Javadoc)
     * @see org.hibernate.UserType#equals(java.lang.Object, java.lang.Object)
     */
    public boolean equals(Object x, Object y) throws HibernateException {
        return (x == y) || (x != null && y != null && x.equals(y));
    }

    /* (non-Javadoc)
     * @see org.hibernate.UserType#isMutable()
     */
    public boolean isMutable() {
        return false;
    }

    /* (non-Javadoc)
     * @see org.hibernate.UserType#nullSafeGet(java.sql.ResultSet, java.lang.String[], java.lang.Object)
     */
    public Object nullSafeGet(ResultSet rs, String[] names, Object owner) throws HibernateException, SQLException {
        byte[] bytes = rs.getBytes(names[0]);
        if (rs.wasNull()) {
            return null;
        }

        //TODO figure out how to inject this
        HomeFactory homeFactory = (HomeFactory) ComponentManager.getInstance().get("xmlHomeFactory");
        WritableObjectHome home = (WritableObjectHome) homeFactory.getHome("agent");

        StructuredArtifact artifact = (StructuredArtifact) home.createInstance();
        ByteArrayInputStream in = new ByteArrayInputStream(bytes);
        SAXBuilder saxBuilder = new SAXBuilder();
        saxBuilder.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true); // SAK-23245
        try {
            Document doc = saxBuilder.build(in);
            artifact.setBaseElement(doc.getRootElement());
        } catch (JDOMException e) {
            throw new HibernateException(e);
        } catch (IOException e) {
            throw new HibernateException(e);
        }
        return artifact;
    }

    /* (non-Javadoc)
     * @see org.hibernate.UserType#nullSafeSet(java.sql.PreparedStatement, java.lang.Object, int)
     */
    public void nullSafeSet(PreparedStatement st, Object value, int index) throws HibernateException, SQLException {
        if (value == null) {
            st.setNull(index, Types.VARBINARY);
        } else {
            StructuredArtifact artifact = (StructuredArtifact) value;
            Document doc = new Document();
            Element rootElement = artifact.getBaseElement();
            rootElement.detach();
            doc.setRootElement(rootElement);
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            XMLOutputter xmlOutputter = new XMLOutputter();
            try {
                xmlOutputter.output(doc, out);
            } catch (IOException e) {
                throw new HibernateException(e);
            }
            st.setBytes(index, out.toByteArray());
        }

    }

    /* (non-Javadoc)
     * @see org.hibernate.UserType#returnedClass()
     */
    public Class returnedClass() {
        return StructuredArtifact.class;
    }

    public Object assemble(Serializable arg0, Object arg1) throws HibernateException {
        return null;
    }

    public Serializable disassemble(Object arg0) throws HibernateException {
        return null;
    }

    public int hashCode(Object arg0) throws HibernateException {
        return arg0.hashCode();
    }

    public Object replace(Object arg0, Object arg1, Object arg2) throws HibernateException {
        return arg0;
    }

}