FR [ 2996361 ] Add POWrapper class
Link to SF Tracker: http://sourceforge.net/support/tracker.php?aid=2996361
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teo_sarca
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/******************************************************************************
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* Product: Adempiere ERP & CRM Smart Business Solution *
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* Copyright (C) 2010 Teo Sarca, teo.sarca@gmail.com *
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* This program is free software; you can redistribute it and/or modify it *
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* under the terms version 2 of the GNU General Public License as published *
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* by the Free Software Foundation. This program is distributed in the hope *
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* that it will be useful, but WITHOUT ANY WARRANTY; without even the implied *
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. *
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* See the GNU General Public License for more details. *
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* You should have received a copy of the GNU General Public License along *
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* with this program; if not, write to the Free Software Foundation, Inc., *
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. *
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*****************************************************************************/
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package org.adempiere.model;
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import java.lang.reflect.InvocationHandler;
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import java.lang.reflect.Method;
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import java.lang.reflect.Proxy;
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import java.math.BigDecimal;
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import java.util.logging.Level;
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import org.adempiere.exceptions.AdempiereException;
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import org.compiere.model.MTable;
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import org.compiere.model.PO;
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import org.compiere.util.CLogger;
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/**
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* Wrap a PO object to a given bean interface.
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* Example
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* <pre>
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* public interface I_C_Invoice_Customized
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* {
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* public int getCustomValue1();
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* public void setCustomValue1(int customValue1);
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* public String getCustomString1();
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* public void setCustomString1(String customString1);
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* }
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* ....
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* MInvoice invoice = ......;
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* I_C_Invoice_Customized invoiceCustomized = POWrapper.create(invoice, I_C_Invoice_Customized.class);
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* invoiceCustomized.setCustomValue1(12345);
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* invoiceCustomized.setCustomString1("my test string");
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* invoice.saveEx();
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* </pre>
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* @author Teo Sarca, teo.sarca@gmail.com
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*/
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public class POWrapper implements InvocationHandler
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{
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@SuppressWarnings("unchecked")
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public static <T> T create(Object po, Class<T> cl)
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{
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if (!(po instanceof PO))
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{
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throw new AdempiereException("Not a PO object - "+po);
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}
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if (cl.isInstance(po))
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{
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return (T)po;
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}
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return (T)Proxy.newProxyInstance(cl.getClassLoader(), new Class<?>[]{cl}, new POWrapper((PO)po));
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}
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@SuppressWarnings("unchecked")
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public static <T extends PO> T getPO(Object model)
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{
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POWrapper wrapper = (POWrapper)Proxy.getInvocationHandler(model);
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return (T)wrapper.getPO();
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}
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private final CLogger log = CLogger.getCLogger(getClass());
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private final PO po;
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private POWrapper(PO po)
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{
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super();
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this.po = po;
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}
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public Object invoke(Object proxy, Method method, Object[] args) throws Throwable
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{
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String methodName = method.getName();
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if (methodName.startsWith("set") && args.length == 1)
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{
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String propertyName = methodName.substring(3);
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po.set_ValueOfColumn(propertyName, args[0]);
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return null;
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}
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else if (methodName.startsWith("get") && (args == null || args.length == 0))
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{
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String propertyName = methodName.substring(3);
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Object value = null;
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final int idx = po.get_ColumnIndex(propertyName);
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if (idx >= 0)
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value = po.get_Value(propertyName);
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if (value != null)
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{
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return value;
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}
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//
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if (method.getReturnType() == int.class)
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{
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value = Integer.valueOf(0);
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}
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else if (method.getReturnType() == BigDecimal.class)
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{
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value = BigDecimal.ZERO;
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}
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else if (isModelInterface(method.getReturnType()))
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{
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value = getReferencedObject(propertyName, method);
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}
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else if (PO.class.isAssignableFrom(method.getReturnType()))
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{
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throw new IllegalArgumentException("Method not supported - "+methodName);
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}
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return value;
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}
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else if (methodName.startsWith("is") && (args == null || args.length == 0))
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{
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String propertyName = methodName.substring(2);
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int ii = po.get_ColumnIndex(propertyName);
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if (ii >= 0)
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{
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return po.get_Value(ii);
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}
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ii = po.get_ColumnIndex("Is"+propertyName);
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if (ii >= 0)
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{
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return po.get_Value(ii);
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}
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//
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throw new IllegalArgumentException("Method not supported - "+methodName);
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}
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else
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{
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return method.invoke(po, args);
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}
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}
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public PO getPO()
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{
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return po;
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}
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/**
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* Load object that is referenced by given property.
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* Example: getReferencedObject("M_Product", method) should load the M_Product record
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* with ID given by M_Product_ID property name;
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* @param propertyName
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* @param method
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* @return
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*/
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private final Object getReferencedObject(String propertyName, Method method)
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{
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int i = po.get_ColumnIndex(propertyName+"_ID");
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if (i < 0)
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return null;
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// Fetch Record_ID
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final Integer record_id = po.get_ValueAsInt(i);
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if (record_id == null || record_id <= 0)
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return null;
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// Fetch TableName from returning class
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Class<?> cl = method.getReturnType();
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String tableName;
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try
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{
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tableName = (String)cl.getField("Table_Name").get(null);
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}
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catch (Exception e)
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{
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log.log(Level.SEVERE, e.getLocalizedMessage(), e);
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return null;
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}
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// Load Persistent Object
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PO child = MTable.get(po.getCtx(), tableName).getPO(record_id, po.get_TrxName());
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return child;
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}
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private boolean isModelInterface(Class<?> cl)
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{
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try
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{
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String tableName = (String)cl.getField("Table_Name").get(null);
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return tableName != null;
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}
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catch (Exception e)
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{
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return false;
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}
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}
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}
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