/*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999-2002 The Apache Software Foundation. All rights
* reserved.
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* 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
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* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
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* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
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*/
package org.apache.commons.discovery.resource.names;
import org.apache.commons.discovery.ResourceNameDiscover;
import org.apache.commons.discovery.ResourceNameIterator;
/**
* Helper class for methods implementing the ResourceNameDiscover interface.
*
* @author Richard A. Sitze
*/
public abstract class ResourceNameDiscoverImpl implements ResourceNameDiscover
{
/**
* Locate names of resources that are bound to <code>resourceName</code>.
*
* @return ResourceNameIterator
*/
public abstract ResourceNameIterator findResourceNames(String resourceName);
/**
* Locate names of resources that are bound to <code>resourceName</code>.
*
* @return ResourceNameIterator
*/
public ResourceNameIterator findResourceNames(final ResourceNameIterator inputNames) {
return new ResourceNameIterator() {
private ResourceNameIterator resourceNames = null;
private String resourceName = null;
public boolean hasNext() {
if (resourceName == null) {
resourceName = getNextResourceName();
}
return resourceName != null;
}
public String nextResourceName() {
String name = resourceName;
resourceName = null;
return name;
}
private String getNextResourceName() {
while (inputNames.hasNext() && (resourceNames == null || !resourceNames.hasNext())) {
resourceNames =
findResourceNames(inputNames.nextResourceName());
}
return (resourceNames != null && resourceNames.hasNext())
? resourceNames.nextResourceName()
: null;
}
};
}
}