us.mn.state.health.lims.reports.valueholder.common.JRHibernateDataSource.java Source code

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Here is the source code for us.mn.state.health.lims.reports.valueholder.common.JRHibernateDataSource.java

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/**
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (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.mozilla.org/MPL/ 
* 
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
* License for the specific language governing rights and limitations under
* the License.
* 
* The Original Code is OpenELIS code.
* 
* Copyright (C) The Minnesota Department of Health.  All Rights Reserved.
*/
package us.mn.state.health.lims.reports.valueholder.common;

import java.lang.reflect.Method;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRField;
import net.sf.jasperreports.engine.JRRewindableDataSource;

import org.apache.commons.beanutils.PropertyUtils;

import us.mn.state.health.lims.common.log.LogEvent;

/**
 * @author benzd1
 * bugzilla 2264
 * bugzilla 2325 - implement JRRewindableDataSource moveFirst to 
 *                 fix problem with local oc4j (app server hangs)
 */
public class JRHibernateDataSource implements JRRewindableDataSource {

    protected HashMap fieldsToIdxMap = new HashMap();

    protected Iterator iterator;

    protected Object currentValue;

    //bugzilla 2325
    protected Collection records;

    public JRHibernateDataSource(Collection list) {
        this.iterator = list.iterator();
        //bugzilla 2325
        records = list;
    }

    public JRHibernateDataSource(Map list) {
        this.iterator = list.values().iterator();
        //bugzilla 2325
        records = (Collection) list;
    }

    private Object nestedFieldValue(Object object, String field) {
        Object value = null;
        if (field.indexOf("__") > -1) {
            try {
                Method nestedGetter = PropertyUtils.getReadMethod(
                        PropertyUtils.getPropertyDescriptor(object, field.substring(0, field.indexOf("__"))));
                Object nestedObject = nestedGetter.invoke(object, (Object[]) null);
                value = nestedFieldValue(nestedObject, field.substring(field.indexOf("__") + 2, field.length()));
            } catch (Exception ex) {
                //bugzilla 2154
                LogEvent.logError("JRHibernateDataSource", "nestedFieldValue()", ex.toString());
            }
        } else {
            try {
                Method getter = PropertyUtils.getReadMethod(PropertyUtils.getPropertyDescriptor(object, field));
                value = getter.invoke(object, (Object[]) null);
                if (Collection.class.isAssignableFrom(getter.getReturnType())) {
                    return new JRHibernateDataSource((Collection) value);
                }
                if (Map.class.isAssignableFrom(getter.getReturnType())) {
                    return new JRHibernateDataSource((Map) value);
                }
            } catch (Exception ex) {
                //bugzilla 2154
                LogEvent.logError("JRHibernateDataSource", "nestedFieldValue()", ex.toString());
            }
        }
        return value;
    }

    public Object getCurrentValue() throws JRException {
        return currentValue;
    }

    //for reuse of datasource in subreports
    public Object getPreviousValue() throws JRException {
        return currentValue;
    }

    public Object getFieldValue(JRField field) throws JRException {
        return nestedFieldValue(currentValue, field.getName());
    }

    public boolean next() throws JRException {
        currentValue = iterator.hasNext() ? iterator.next() : null;
        return currentValue != null;
    }

    //bugzilla 2325
    public void moveFirst() throws JRException {
        //reinitialize the iterator for JRRewindableDataSource
        this.iterator = records.iterator();
    }
}