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/*
* ====================================================================
* Project: openCRX/Core, http://www.opencrx.org/
* Description: ChainingCollection
* Owner: the original authors.
* ====================================================================
*
* This software is published under the BSD license
* as listed below.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * 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.
*
* * Neither the name of the openCRX team nor the names of the contributors
* to openCRX 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 OWNER 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.
*
* ------------------
*
* This product includes software developed by the Apache Software
* Foundation (http://www.apache.org/).
*
* This product includes software developed by contributors to
* openMDX (http://www.openmdx.org/)
*/
package org.opencrx.kernel.generic;
import java.util.AbstractCollection;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
/**
* ChainingCollection
*
* @param
*/
public class ChainingCollection extends AbstractCollection {
/**
* ChainingIterator
*
*/
class ChainingIterator implements Iterator {
public ChainingIterator(
) {
this.index = 0;
this.iterator = ChainingCollection.this.collections[0].iterator();
}
@Override
public boolean hasNext(
) {
boolean hasNext = this.iterator.hasNext();
while(!hasNext && (this.index < ChainingCollection.this.collections.length - 1)) {
this.index++;
this.iterator = ChainingCollection.this.collections[this.index].iterator();
hasNext = this.iterator.hasNext();
}
return hasNext;
}
@Override
public T next(
) {
return this.iterator.next();
}
@Override
public void remove(
) {
throw new UnsupportedOperationException();
}
private Iterator iterator;
private int index;
}
/**
* Constructor.
*
* @param collections
*/
public ChainingCollection(
Collection... collections
) {
this.collections = collections;
}
/**
* Constructor.
*
* @param collections
*/
@SuppressWarnings("unchecked")
public ChainingCollection(
List> collections
) {
this.collections = collections.toArray(new Collection[collections.size()]);
}
/* (non-Javadoc)
* @see java.util.AbstractCollection#iterator()
*/
@Override
public Iterator iterator(
) {
return new ChainingIterator();
}
/* (non-Javadoc)
* @see java.util.AbstractCollection#size()
*/
@Override
public int size(
) {
int size = 0;
for(int i = 0; i < this.collections.length; i++) {
size += this.collections[i].size();
}
return size;
}
protected final Collection[] collections;
}