/*
* Copyright (c) 1999 The Java Apache Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the Java Apache
* Project. <http://java.apache.org/>"
*
* 4. The names "Java Apache Element Construction Set", "Java Apache ECS" and
* "Java Apache Project" must not be used to endorse or promote products
* derived from this software without prior written permission.
*
* 5. Products derived from this software may not be called
* "Java Apache Element Construction Set" nor "Java Apache ECS" appear
* in their names without prior written permission of the
* Java Apache Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the Java Apache
* Project. <http://java.apache.org/>"
*
* THIS SOFTWARE IS PROVIDED BY THE JAVA APACHE PROJECT "AS IS" AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE JAVA APACHE PROJECT OR
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This software consists of voluntary contributions made by many
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*
*/
package org.apache.ecs.filter;
import org.apache.ecs.Filter;
import java.text.StringCharacterIterator;
import java.text.CharacterIterator;
/**
Stupid implementation of Filter interface to demonstrate how easy <br>
it is to create your own filters. <b>This should NOT be used</b> in/for<br>
anything real. Anyone want to implement a regex filter?
@version $Id: StringFilter.java,v 1.4 2000/01/18 08:53:43 stephan Exp $
@author <a href="mailto:snagy@servletapi.com">Stephan Nagy</a>
@author <a href="mailto:jon@clearink.com">Jon S. Stevens</a>
*/
public class StringFilter extends java.util.Hashtable implements Filter
{
public StringFilter()
{
super(4);
}
/** Returns the name of the filter */
public String getInfo()
{
return "StringFilter";
}
/**
this method actually performs the filtering.
*/
public String process(String to_process)
{ System.out.println("\nString to Process in StringFilter = "+to_process);
String[] value = split(to_process);
StringBuffer new_value = new StringBuffer();
for(int x = 0; x < value.length; x++)
{
if(hasAttribute(value[x]))
new_value.append((String)get(value[x]));
else
new_value.append(value[x]);
if(x != value.length - 1)
new_value.append(" ");
}
return(new_value.toString());
}
/**
Put a filter somewhere we can get to it.
*/
public Filter addAttribute(String attribute,Object entity)
{
put(attribute,entity);
return(this);
}
/**
Get rid of a current filter.
*/
public Filter removeAttribute(String attribute)
{
try
{
remove(attribute);
}
catch(NullPointerException exc)
{ // don't really care if this throws a null pointer exception
}
return(this);
}
/**
Does the filter filter this?
*/
public boolean hasAttribute(String attribute)
{
return(containsKey(attribute));
}
/**
Need a way to parse the stream so we can do string comparisons instead
of character comparisons.
*/
private String[] split(String to_split)
{
if ( to_split == null || to_split.length() == 0 )
{
String[] array = new String[0];
return array;
}
StringBuffer sb = new StringBuffer(to_split.length()+50);
StringCharacterIterator sci = new StringCharacterIterator(to_split);
int length = 0;
for (char c = sci.first(); c != CharacterIterator.DONE; c = sci.next())
{
if(String.valueOf(c).equals(" "))
length++;
else if(sci.getEndIndex()-1 == sci.getIndex())
length++;
}
String[] array = new String[length];
length = 0;
String tmp = new String();
for (char c = sci.first(); c!= CharacterIterator.DONE; c = sci.next())
{
if(String.valueOf(c).equals(" "))
{
array[length] = tmp;
tmp = new String();
length++;
}
else if(sci.getEndIndex()-1 == sci.getIndex())
{
tmp = tmp+String.valueOf(sci.last());
array[length] = tmp;
tmp = new String();
length++;
}
else
tmp += String.valueOf(c);
}
return(array);
}
}