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/**
 * Copyright (c) 2011, University of Konstanz, Distributed Systems Group
 * All rights reserved.
 * 
 * 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 University of Konstanz 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  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 org.treetank.axis;

import org.treetank.api.INodeReadTrx;
import org.treetank.data.ElementNode;
import org.treetank.data.IConstants;

/**
 * AttributeAxis
 * 
 * 
 * Iterate over all attibutes of a given node.
 * 
 */
public class AttributeAxis extends AbsAxis {

    /** Remember next key to visit. */
    private int mNextIndex;

    /**
     * Constructor initializing internal state.
     * 
     * @param rtx
     *            Exclusive (immutable) mTrx to iterate with.
     */
    public AttributeAxis(final INodeReadTrx rtx) {
        super(rtx);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public final void reset(final long mNodeKey) {
        super.reset(mNodeKey);
        mNextIndex = 0;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public final boolean hasNext() {
        resetToLastKey();
        // move back to element, if there was already an attribute found. In
        // this
        // case the current node was set to an attribute by resetToLastKey()
        if (mNextIndex > 0) {
            moveTo(getNode().getParentKey());
        }
        if (getNode().getKind() == IConstants.ELEMENT
            && mNextIndex < ((ElementNode)getNode()).getAttributeCount()) {
            moveTo(((ElementNode)getNode()).getAttributeKey(mNextIndex));
            mNextIndex += 1;
            return true;
        }
        resetToStartKey();
        return false;
    }

}