/* Copyright 2004 The Apache Software Foundation
*
* Licensed under the Apache 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.apache.org/licenses/LICENSE-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.apache.xmlbeans.samples.cursor;
import statement.StatementDocument;
import statement.StatementDocument.Statement;
import statement.Transaction;
import java.io.File;
import org.apache.xmlbeans.XmlCursor;
import javax.xml.namespace.QName;
public class OrderMatters
{
private static QName deposit = new QName( "http://statement", "deposit" );
public static void main ( String[] args ) throws Exception
{
// load the xml instance into the store and return a
// strongly typed instance of StatementDocument
StatementDocument stmtDoc = StatementDocument.Factory.parse( new File( args[ 0 ] ) );
System.out.println( "Valid statement instance? " + stmtDoc.validate() );
float balance = balanceOutOfOrder(stmtDoc);
System.out.println( "Ending balance: $" + balance );
balance = balanceInOrder(stmtDoc);
System.out.println( "Ending balance: $" + balance );
}
/**
* Out of order balance: the ease of stronly-typed XmlObjects!
*/
public static float balanceOutOfOrder(StatementDocument stmtDoc)
{
Statement stmt = stmtDoc.getStatement();
float balance = 0;
Transaction[] deposits = stmt.getDepositArray();
Transaction[] withdrawals = stmt.getWithdrawalArray();
for ( int i = 0 ; i < deposits.length ; i++ )
balance += deposits[ i ].getAmount();
for ( int i = 0 ; i < withdrawals.length ; i++ )
balance -= withdrawals[ i ].getAmount();
return balance;
}
/**
* In order balance: the power of XmlCursor!
*/
public static float balanceInOrder(StatementDocument stmtDoc)
{
float balance = 0;
XmlCursor cursor = stmtDoc.newCursor();
// use xpath to select elements
cursor.selectPath( "*/*" );
// iterate over the selection
while ( cursor.toNextSelection() )
{
// two views of the same data:
// move back and forth between XmlObject <-> XmlCursor
Transaction trans = (Transaction) cursor.getObject();
float amount = trans.getAmount();
if (cursor.getName().equals( deposit ))
balance += amount;
else if ((balance -= amount) < 0)
{
// doh!
System.out.println( "Negative balance: $" + balance );
balance -= 50;
}
}
return balance;
}
}