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Micro Distribution of the Payara Project for IBM JDK
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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* language governing permissions and limitations under the License.
*
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* file and include the License file at packager/legal/LICENSE.txt.
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*
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*/
package org.glassfish.admin.amx.util;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
public final class IteratorUtil
{
private IteratorUtil()
{
// disallow instantiation
}
public static Object[] toArray(final Iterator iter)
{
final List list = new ArrayList();
while (iter.hasNext())
{
final T elem = iter.next();
list.add(elem);
}
final Object[] result = new Object[list.size()];
list.toArray(result);
return (ArrayConversion.specializeArray(result));
}
/**
@param iter
@return the Class of the elements, or null if all null or different
*/
public static Class getUniformClass(final Iterator> iter)
{
Class theClass = null;
Object next;
if (iter.hasNext())
{
next = iter.next();
theClass = (next == null) ? null : next.getClass();
}
while (iter.hasNext())
{
next = iter.next();
if (next != null && next.getClass() != theClass)
{
theClass = null;
break;
}
}
return (theClass);
}
/**
@param iter
@param theClass
@param exactMatch if true, then subclasses are considered to be different
@return true if all items are of the same class
*/
public static boolean isUniformClass(
final Iterator> iter,
final Class theClass,
final boolean exactMatch)
{
boolean isUniform = true;
while (iter.hasNext())
{
Object next = iter.next();
final Class nextClass = (next == null) ? null : next.getClass();
if (nextClass != theClass && nextClass != null)
{
if (exactMatch)
{
isUniform = false;
break;
}
if (!theClass.isAssignableFrom(nextClass))
{
isUniform = false;
break;
}
}
}
return (isUniform);
}
}
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