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/*
* Copyright (c) 2004 - 2012 Eike Stepper (Berlin, Germany) and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.net4j.util.collection;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
/**
* @author Eike Stepper
* @since 3.2
*/
public class CaseInsensitiveStringSet extends HashSet<String>
{
private static final long serialVersionUID = 1L;
public CaseInsensitiveStringSet()
{
}
public CaseInsensitiveStringSet(Collection<? extends String> c)
{
super(c);
}
public CaseInsensitiveStringSet(int initialCapacity, float loadFactor)
{
super(initialCapacity, loadFactor);
}
public CaseInsensitiveStringSet(int initialCapacity)
{
super(initialCapacity);
}
public boolean isLowerCase()
{
return true;
}
@Override
public boolean contains(Object o)
{
return super.contains(convert(o));
}
@Override
public boolean add(String e)
{
return super.add(convert(e));
}
@Override
public boolean remove(Object o)
{
return super.remove(convert(o));
}
@Override
public boolean removeAll(Collection<?> c)
{
return super.removeAll(convert(c));
}
@Override
public boolean containsAll(Collection<?> c)
{
return super.containsAll(convert(c));
}
@Override
public boolean addAll(Collection<? extends String> c)
{
boolean modified = false;
Iterator<? extends String> e = c.iterator();
while (e.hasNext())
{
if (add(convert(e.next())))
{
modified = true;
}
}
return modified;
}
@Override
public boolean retainAll(Collection<?> c)
{
return super.retainAll(convert(c));
}
protected String convert(Object o)
{
if (o instanceof String)
{
if (isLowerCase())
{
return ((String)o).toLowerCase();
}
return ((String)o).toUpperCase();
}
return null;
}
protected Collection<?> convert(Collection<?> c)
{
Collection<Object> list = new ArrayList<Object>();
for (Iterator<?> it = c.iterator(); it.hasNext();)
{
Object o = it.next();
list.add(convert(o));
}
return list;
}
}
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