JRHibernateDataSource.java

/**
* 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();
    }
}