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/*
* Janino - An embedded Java[TM] compiler
*
* Copyright (c) 2001-2010 Arno Unkrig. All rights reserved.
* Copyright (c) 2015-2016 TIBCO Software Inc. 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. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS 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 COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, 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.
*/
package com.hazelcast.org.codehaus.janino.util;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.NoSuchElementException;
import com.hazelcast.org.codehaus.janino.InternalCompilerException;
/**
* An {@link java.util.Iterator} that traverses a {@link java.util.Collection} of {@link java.util.Iterator}s.
*
* @param The element type of the iterator
*/
public
class MultiIterator implements Iterator {
private final Iterator outer; // Over Iterators, Collections or arrays
private Iterator inner = Collections.emptyList().iterator();
/**
* @param iterators An array of {@link Iterator}s
*/
public
MultiIterator(Iterator[] iterators) { this.outer = Arrays.asList(iterators).iterator(); }
/**
* @param collections An array of {@link Collection}s
*/
public
MultiIterator(Collection[] collections) { this.outer = Arrays.asList(collections).iterator(); }
/**
* @param arrays An array of arrays
*/
public
MultiIterator(Object/*T*/[][] arrays) { this.outer = Arrays.asList(arrays).iterator(); }
/**
* @param collection A {@link Collection} of {@link Collection}s, {@link Iterator}s and/or arrays
*/
public
MultiIterator(Collection collection) { this.outer = collection.iterator(); }
/**
* @param iterator An iterator over {@link Collection}s, {@link Iterator}s and/or arrays
*/
public
MultiIterator(Iterator iterator) { this.outer = iterator; }
/**
* @param array An array of {@link Collection}s, {@link Iterator}s and/or arrays
*/
public
MultiIterator(Object[] array) { this.outer = Arrays.asList(array).iterator(); }
/**
* Iterates over the given {@link Collection}, prepended with the given {@link Object}.
*/
public
MultiIterator(Object/*T*/ object, Collection collection) {
this.outer = Arrays.asList(new Object[] { object }, collection).iterator();
}
/**
* Iterates over the given {@link Collection}, appended with the given {@link Object}.
*/
public
MultiIterator(Collection collection, Object/*T*/ object) {
this.outer = Arrays.asList(collection, new Object[] { object }).iterator();
}
/**
* Iterates over the given {@link Iterator}, prepended with the given prefix.
*/
public
MultiIterator(Object/*T*/ prefix, Iterator iterator) {
this.outer = Arrays.asList(new Object[] { prefix }, iterator).iterator();
}
/**
* Iterates over the given {@link Iterator}, appended with the given {@code suffix}.
*/
public
MultiIterator(Iterator iterator, Object/*T*/ suffix) {
this.outer = Arrays.asList(iterator, new Object[] { suffix }).iterator();
}
@Override public boolean
hasNext() {
for (;;) {
if (this.inner.hasNext()) return true;
if (!this.outer.hasNext()) return false;
Object o = this.outer.next();
if (o instanceof Iterator) {
@SuppressWarnings("unchecked") Iterator tmp = (Iterator) o;
this.inner = tmp;
} else
if (o instanceof Collection) {
@SuppressWarnings("unchecked") Collection tmp = (Collection) o;
this.inner = tmp.iterator();
} else
if (o instanceof Object[]) {
@SuppressWarnings("unchecked") T[] tmp = (T[]) o;
this.inner = Arrays.asList(tmp).iterator();
} else
{
throw new InternalCompilerException("Unexpected element type \"" + o.getClass().getName() + "\"");
}
}
}
@Override public T
next() {
if (this.hasNext()) return this.inner.next();
throw new NoSuchElementException();
}
@Override public void
remove() {
this.inner.remove();
}
}
