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JavaPOS Configuration Loader Library
package jpos.config;
///////////////////////////////////////////////////////////////////////////////
//
// This software is provided "AS IS". The JavaPOS working group (including
// each of the Corporate members, contributors and individuals) MAKES NO
// REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE SOFTWARE,
// EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
// WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NON-INFRINGEMENT. The JavaPOS working group shall not be liable for
// any damages suffered as a result of using, modifying or distributing this
// software or its derivatives. Permission to use, copy, modify, and distribute
// the software and its documentation for any purpose is hereby granted.
//
// The JavaPOS Config/Loader (aka JCL) is now under the CPL license, which
// is an OSS Apache-like license. The complete license is located at:
// http://www.ibm.com/developerworks/library/os-cpl.html
//
///////////////////////////////////////////////////////////////////////////////
import java.util.*;
import java.lang.reflect.*;
import java.net.URL;
import jpos.loader.*;
import jpos.util.*;
import jpos.util.tracing.Tracer;
import jpos.util.tracing.TracerFactory;
/**
* Default implementation of the CompositeRegPopulator interface
* @since 1.3 (Washington DC 2001 meeting)
* @author E. Michael Maximilien ([email protected])
*/
public class DefaultCompositeRegPopulator extends Object
implements CompositeRegPopulator
{
//-------------------------------------------------------------------------
// Ctor(s)
//
/**
* Creates a CompositePopulator with a null default populator
* NOTE: you must set the default populator before this is usable or
* call the load() method which will set the default populator from
* the multi-property in the jpos.properties file if that file exist
*/
public DefaultCompositeRegPopulator() {}
/**
* Creates a CompositePopulator with a default populator
* @param populator the default populator for this composite
*/
public DefaultCompositeRegPopulator( JposRegPopulator populator )
{
add( populator );
setDefaultPopulator( populator );
}
//-------------------------------------------------------------------------
// Private methods
//
/**
* @return a JposPopulator using the popName as unique ID, populator class name passed
* If could not create the populator then returns null and add a trace info
* @param popName the unique ID for this populator
* @param className the JposRegPopulator implementing class name
*/
private JposRegPopulator createPopulator( String popName, String className )
{
JposRegPopulator populator = null;
try
{
Class popClass = Class.forName( className );
try
{
Class[] ctorParamTypes = { String.class };
Constructor ctor = popClass.getConstructor( ctorParamTypes );
Object[] args = { popName };
populator = (JposRegPopulator)ctor.newInstance( args );
}
catch( NoSuchMethodException nsme )
{
Constructor ctor = popClass.getConstructor( new Class[ 0 ] );
populator = (JposRegPopulator)ctor.newInstance( new Object[ 0 ] );
}
}
catch( ClassNotFoundException cnfe )
{
tracer.println( "Could not find populator class with name: " +
className + " exception message = " +
cnfe.getMessage() );
}
catch( NoSuchMethodException nsme )
{
tracer.println( "Populator by class name: " +
className +
" must define a no-arg ctor or a 1-arg ctor with String param as the unique ID" );
}
catch( InstantiationException ie )
{
tracer.println( "Could not instantiate populator class with name: " +
className + " exception message = " +
ie.getMessage() );
}
catch( Exception e )
{
tracer.println( "Could not instantiate populator class with name: " +
className + " exception message = " +
e.getMessage() );
}
return populator;
}
//-------------------------------------------------------------------------
// Protected methods
//
/**
* Sets the default JposRegPopulator. Orphan JposEntry objects (that is the ones that
* do not have a JposRegPopulator) are automatically assign to this one.
* @param populator the JposRegPopulator
* @throws java.lang.IllegalArgumentException if the argument is null or not a valid JposRegPopulator
*/
protected void setDefaultPopulator( JposRegPopulator populator ) throws IllegalArgumentException
{
if( populator == null )
throw new IllegalArgumentException( "Null value cannot be used for default JposRegPopualtor" );
if( populator.getUniqueId() == null || "".equals( populator.getUniqueId() ) )
throw
new IllegalArgumentException( "Default JposRegPopualtor cannot have a unique ID of null or empty string" );
add( populator );
defaultPop = populator;
}
//-------------------------------------------------------------------------
// Public JposRegPopulator methods
//
/**
* @return a unique String ID for this JposRegPopulator instance
* Can be implemented in terms of the getClassName() method
*/
public String getUniqueId() { return getClassName(); }
/**
* @return the fully qualified class name implementing the
* JposRegPopulator interface
*/
public String getClassName()
{ return DefaultCompositeRegPopulator.class.getName(); }
/**
* Tell the populator to save the current entries
* @param entries an enumeration of JposEntry objects
* @throws java.lang.Exception if any error occurs while saving
*/
public void save( Enumeration entries ) throws Exception
{
HashMap popEntriesMap = new HashMap();
Iterator popIterator = popMap.values().iterator();
while( popIterator.hasNext() )
popEntriesMap.put( ( (JposRegPopulator)popIterator.next() ).
getUniqueId(),
new ArrayList() );
while( entries.hasMoreElements() )
{
JposEntry entry = (JposEntry)entries.nextElement();
JposRegPopulator populator = (JposRegPopulator)entry.
getRegPopulator();
if( populator == null )
{
Collection defaultEntryList = (Collection)popEntriesMap.
get( getDefaultPopulator().
getUniqueId() );
defaultEntryList.add( entry );
}
else
{
Collection entryList = (Collection)popEntriesMap.
get( populator.getUniqueId() );
if( entryList == null )
tracer.println( "Trying to save entry with logicalName = " +
entry.getLogicalName() +
" and populator with" );
else
entryList.add( entry );
}
}
Exception exception = null;
popIterator = popMap.values().iterator();
while( popIterator.hasNext() )
{
JposRegPopulator populator = (JposRegPopulator)popIterator.next();
String popUniqueId = populator.getUniqueId();
Collection entryList = (Collection)popEntriesMap.get( popUniqueId );
try
{
if( popFileMap.get( populator.getUniqueId() ) != null )
populator.save( new Vector( entryList ).elements(),
(String)popFileMap.get( populator.getUniqueId() ) );
else
populator.save( new Vector( entryList ).elements() );
}
catch( Exception e )
{
exception = e;
tracer.println( "Error while saving to populator with unique ID:" +
populator.getUniqueId() );
}
}
if( exception != null ) throw exception;
}
/**
* Tell the populator to save the current entries in the file specified using
* the default JposRegPopulator
* @param entries an enumeration of JposEntry objects
* @param fileName the file name to save entries
* @throws java.lang.Exception if any error occurs while saving
*/
public void save( Enumeration entries, String fileName ) throws Exception
{
getDefaultPopulator().save( entries, fileName );
}
/**
* Tell the populator to load the entries. Looks for 2 multi-properties for the
* populator class and populator file name called:
* jpos.config.populator.class.0
* jpos.config.populator.file.0
* All entries are loaded by using the file name in the properties file for each
* populator defined in the JposEntryProperties.
*/
public void load()
{
JposProperties jposProperties = JposServiceLoader.getManager().getProperties();
JposProperties.MultiProperty populatorClassMultiProp =
jposProperties.getMultiProperty( JposProperties.JPOS_CONFIG_POPULATOR_CLASS_MULTIPROP_NAME );
JposProperties.MultiProperty populatorFileMultiProp =
jposProperties.getMultiProperty( JposProperties.JPOS_CONFIG_POPULATOR_FILE_MULTIPROP_NAME );
if( populatorClassMultiProp.getNumberOfProperties() == 0 )
{
tracer.println( "CompositeRegPopulator.load() w/o any defined multi-property" );
throw new RuntimeException( "CompositeRegPopulator.load() w/o any defined multi-property" );
}
Iterator popClasses = populatorClassMultiProp.getSortedPropertyNames();
String defaultPopName = (String)popClasses.next();
String defaultPopClass = populatorClassMultiProp.getPropertyString( defaultPopName );
int defaultPopClassNumber = populatorClassMultiProp.propertyNumber( defaultPopName );
JposRegPopulator defaultPopulator = createPopulator( defaultPopName, defaultPopClass );
if( populatorFileMultiProp != null && populatorFileMultiProp.getNumberOfProperties() > 0 )
{
String defaultPopFile = (String)populatorFileMultiProp.getPropertyString( defaultPopClassNumber );
if( defaultPopFile != null )
{
defaultPopulator.load( defaultPopFile );
lastLoadException = defaultPopulator.getLastLoadException();
popFileMap.put( defaultPopulator.getUniqueId(), defaultPopFile );
}
else
{
tracer.println( "Created default populator with name = " + defaultPopName +
" OK but populator file is null" );
defaultPopulator.load();
lastLoadException = defaultPopulator.getLastLoadException();
}
}
else
{
defaultPopulator.load();
lastLoadException = defaultPopulator.getLastLoadException();
}
if( defaultPopulator != null )
setDefaultPopulator( defaultPopulator );
else
tracer.println( "Did not add default populator by : " +
"<" + defaultPopName + ", " + defaultPopClass + ">" );
while( popClasses.hasNext() )
{
String popName = (String)popClasses.next();
String popClass = populatorClassMultiProp.getPropertyString( popName );
int popClassNumber = populatorClassMultiProp.propertyNumber( popName );
JposRegPopulator populator = createPopulator( popName, popClass );
if( populator != null )
{
if( populatorFileMultiProp != null && populatorFileMultiProp.getNumberOfProperties() > 0 )
{
String popFile = (String)populatorFileMultiProp.getPropertyString( popClassNumber );
populator.load( popFile );
popFileMap.put( populator.getUniqueId(), popFile );
}
else
{
tracer.println( "Created populator with name = " + popName +
" OK but populator file is null" );
populator.load();
lastLoadException = populator.getLastLoadException();
}
add( populator );
}
else
tracer.println( "Did not add populator by : " +
"<" + popName + ", " + popClass + ">" );
}
}
/**
* Loads the entries specified in the fileName for the default populator
* @param fileName the entries file name
*/
public void load( String fileName ) { getDefaultPopulator().load( fileName ); }
/** @return the URL pointing to the entries file loaded or saved */
public URL getEntriesURL() { return this.getDefaultPopulator().getEntriesURL(); }
/**
* @return an Enumeration of JposEntry objects
* NOTE: this method is O(nm) where n == number of populators and m == average
* number of entries in populator. Could do better by keeping more data structure
* but not worth it if n and m are small (as expected in typical system)
*/
public Enumeration getEntries()
{
Vector entryVector = new Vector();
Iterator populators = getPopulators();
while( populators.hasNext() )
{
JposRegPopulator pop = (JposRegPopulator)populators.next();
Enumeration entries = pop.getEntries();
while( entries.hasMoreElements() )
entryVector.add( entries.nextElement() );
}
return entryVector.elements();
}
/**
* @retun true if this populator is a composite populator or false otherwise
* @since 1.3 (Washington DC 2001 meeting)
*/
public boolean isComposite() { return true; }
/**
* @return the name of this populator. This should be a short descriptive name
* @since 1.3 (Washington DC 2001 meeting)
*/
public String getName() { return COMPOSITE_REG_POPULATOR_STRING; }
/**
* @return the last exception (if any) during the last load or null if no exception occurred
* @since 2.0.0
*/
public Exception getLastLoadException() { return lastLoadException; }
/**
* @return a String representation of this JposRegPopulator
* @since 1.3 (Washington DC 2001 meeting)
*/
public String toString() { return getName(); }
//-------------------------------------------------------------------------
// Public methods
//
/** @return the default JposRegPopulator */
public JposRegPopulator getDefaultPopulator() { return defaultPop; }
/**
* Adds this JposRegPopulator to the composite
* @param populator adds the populator to the composite reg populator. Does nothing
* if the popualator already is in the composite
*/
public void add( JposRegPopulator populator ) { popMap.put( populator.getUniqueId(), populator ); }
/**
* Removes this JposRegPopulator from the composite
* @param populator removes the populator to the composite reg populator
*/
public void remove( JposRegPopulator populator ) { popMap.remove( populator.getUniqueId() ); }
/** @return an iterator over all populators in this composite */
public Iterator getPopulators() { return popMap.values().iterator(); }
/**
* @return the populator with unique ID passed
* @param uniqueId the populator unique ID
* @see jpos.config.JposRegPopulator#getUniqueId()
*/
public JposRegPopulator getPopulator( String uniqueId )
{ return (JposRegPopulator)popMap.get( uniqueId ); }
/** @return the number of populator in this composite */
public int size() { return popMap.size(); }
//-------------------------------------------------------------------------
// Instance variables
//
private HashMap popMap = new HashMap();
private HashMap popFileMap = new HashMap();
private JposRegPopulator defaultPop = null;
private Exception lastLoadException = null;
private Tracer tracer = TracerFactory.getInstance().
createTracer( "DefaultCompositeRegPopulator" );
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