donaldp 2002/06/26 21:11:21
Modified: src/java/org/apache/avalon/phoenix/components/classloader
DefaultPolicy.java
Added: src/java/org/apache/avalon/phoenix/components/classloader
PropertyUtil.java
Log:
Decouple from util package
Revision Changes Path
1.8 +0 -1
jakarta-avalon-phoenix/src/java/org/apache/avalon/phoenix/components/classloader/DefaultPolicy.java
Index: DefaultPolicy.java
===================================================================
RCS file:
/home/cvs/jakarta-avalon-phoenix/src/java/org/apache/avalon/phoenix/components/classloader/DefaultPolicy.java,v
retrieving revision 1.7
retrieving revision 1.8
diff -u -r1.7 -r1.8
--- DefaultPolicy.java 20 May 2002 10:26:23 -0000 1.7
+++ DefaultPolicy.java 27 Jun 2002 04:11:21 -0000 1.8
@@ -24,7 +24,6 @@
import java.util.StringTokenizer;
import org.apache.avalon.excalibur.i18n.ResourceManager;
import org.apache.avalon.excalibur.i18n.Resources;
-import org.apache.avalon.excalibur.property.PropertyUtil;
import org.apache.avalon.framework.configuration.Configurable;
import org.apache.avalon.framework.configuration.Configuration;
import org.apache.avalon.framework.configuration.ConfigurationException;
1.1
jakarta-avalon-phoenix/src/java/org/apache/avalon/phoenix/components/classloader/PropertyUtil.java
Index: PropertyUtil.java
===================================================================
/*
* Copyright (C) The Apache Software Foundation. All rights reserved.
*
* This software is published under the terms of the Apache Software License
* version 1.1, a copy of which has been included with this distribution in
* the LICENSE.txt file.
*/
package org.apache.avalon.phoenix.components.classloader;
import org.apache.avalon.framework.context.Context;
import org.apache.avalon.framework.context.ContextException;
import org.apache.avalon.framework.context.Resolvable;
/**
* This provides utility methods for properties.
*
* @author <a href="mailto:[EMAIL PROTECTED]">Peter Donald</a>
* @version CVS $Revision: 1.1 $ $Date: 2002/06/27 04:11:21 $
* @since 4.0
*/
final class PropertyUtil
{
private PropertyUtil()
{
}
/**
* Resolve a string property. This evaluates all property
* substitutions based on specified context.
*
* @param property the property to resolve
* @param context the context in which to resolve property
* @param ignoreUndefined if false will throw an PropertyException if
property is not found
* @return the reolved property
* @exception Exception if an error occurs
*/
public static Object resolveProperty( final String property,
final Context context,
final boolean ignoreUndefined )
throws Exception
{
int start = findBeginning( property, 0 );
if( -1 == start )
{
return property;
}
int end = findEnding( property, start );
final int length = property.length();
if( 0 == start && end == ( length - 1 ) )
{
return resolveValue( property.substring( start + 2, end ),
context,
ignoreUndefined );
}
final StringBuffer sb = new StringBuffer( length * 2 );
int lastPlace = 0;
while( true )
{
final Object value =
resolveValue( property.substring( start + 2, end ),
context,
ignoreUndefined );
sb.append( property.substring( lastPlace, start ) );
sb.append( value );
lastPlace = end + 1;
start = findBeginning( property, lastPlace );
if( -1 == start )
{
break;
}
end = findEnding( property, start );
}
sb.append( property.substring( lastPlace, length ) );
return sb.toString();
}
/**
* Resolve a string property. This recursively evaluates all property
* substitutions based on specified context.
*
* @param property the property to resolve
* @param context the context in which to resolve property
* @param ignoreUndefined if false will throw an Exception if property is
not found
* @return the reolved property
* @exception Exception if an error occurs
*/
public static Object recursiveResolveProperty( final String property,
final Context context,
final boolean
ignoreUndefined )
throws Exception
{
int start = findBeginning( property, 0 );
if( -1 == start )
{
return property;
}
int end = findNestedEnding( property, start );
final int length = property.length();
if( 0 == start && end == ( length - 1 ) )
{
final String propertyName = property.substring( start + 2, end );
final Object key = recursiveResolveProperty( propertyName,
context, ignoreUndefined );
return resolveValue( key.toString(), context, ignoreUndefined );
}
final StringBuffer sb = new StringBuffer( length * 2 );
int lastPlace = 0;
while( true )
{
final String propertyName = property.substring( start + 2, end );
final Object key = recursiveResolveProperty( propertyName,
context, ignoreUndefined );
final Object value = resolveValue( key.toString(), context,
ignoreUndefined );
sb.append( property.substring( lastPlace, start ) );
sb.append( value );
lastPlace = end + 1;
start = findBeginning( property, lastPlace );
if( -1 == start )
{
break;
}
end = findNestedEnding( property, start );
}
sb.append( property.substring( lastPlace, length ) );
return sb.toString();
}
private static int findBeginning( final String property, final int
currentPosition )
{
//TODO: Check if it is commented out
return property.indexOf( "${", currentPosition );
}
private static int findEnding( final String property, final int
currentPosition )
throws Exception
{
//TODO: Check if it is commented out
final int index = property.indexOf( '}', currentPosition );
if( -1 == index )
{
throw new Exception( "Malformed property with mismatched }'s" );
}
return index;
}
private static int findNestedEnding( final String property, final int
currentPosition )
throws Exception
{
final int length = property.length();
final int start = currentPosition + 2;
int weight = 1;
for( int i = start; ( weight > 0 ) && ( i < length ); i++ )
{
final char ch = property.charAt( i );
switch( ch )
{
case '}':
//TODO: Check if it is commented out
weight--;
if( weight == 0 )
{
return i;
}
break;
case '$':
{
//TODO: Check if it is commented out
final int next = i + 1;
if( next < length && '{' == property.charAt( next ) )
{
weight++;
}
}
break;
}
}
throw new Exception( "Malformed property with mismatched }'s" );
}
/**
* Retrieve a value from the specified context using the specified key.
* If there is no such value and ignoreUndefined is not false then a
* Exception is generated.
*
* @param key the key of value in context
* @param context the Context
* @param ignoreUndefined true if undefined variables are ignored
* @return the object retrieved from context
* @exception Exception if an error occurs
*/
private static Object resolveValue( final String key,
final Context context,
final boolean ignoreUndefined )
throws Exception
{
Object value = null;
try
{
value = context.get( key );
}
catch( final ContextException ce )
{
}
try
{
while( null != value && value instanceof Resolvable )
{
value = ( (Resolvable)value ).resolve( context );
}
}
catch( final ContextException ce )
{
throw new Exception( "Unable to resolve value for key " + key );
}
if( null == value )
{
if( ignoreUndefined )
return "";
else
{
throw new Exception( "Unable to find " + key + " to expand
during " +
"property resolution." );
}
}
return value;
}
}
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