com.sun.tools.sjavac.options.ArgumentIterator Maven / Gradle / Ivy
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/*
* Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.tools.sjavac.options;
import java.util.Iterator;
/**
* This is NOT part of any supported API.
* If you write code that depends on this, you do so at your own risk.
* This code and its internal interfaces are subject to change or
* deletion without notice.
*/
public class ArgumentIterator implements Iterator {
/** The underlying argument iterator */
private Iterator iter;
/** Extra state used to implement peek and current */
private String current;
private String buffered;
public ArgumentIterator(Iterable iter) {
this.iter = iter.iterator();
}
@Override
public boolean hasNext() {
return buffered != null || iter.hasNext();
}
@Override
public String next() {
fillBuffer();
current = buffered;
buffered = null;
return current;
}
/**
* @return the last element returned by next() (or {@code null} if next has
* never been invoked on this iterator).
*/
public String current() {
return current;
}
/** Can't remove current element, since we may have buffered it. */
@Override
public void remove() {
throw new UnsupportedOperationException();
}
/**
* @return Returns the next element without advancing the iterator
*/
public String peek() {
fillBuffer();
return buffered;
}
private void fillBuffer() {
if (buffered == null && iter.hasNext())
buffered = iter.next();
}
}