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SirixDB is a hybrid on-disk and in-memory document oriented, versioned database system. It has a lightweight buffer manager, stores everything in a huge persistent and durable tree and allows efficient reconstruction of every revision. Furthermore, SirixDB implements change tracking, diffing and supports time travel queries.

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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 io.sirix.axis;

import io.sirix.api.xml.XmlNodeReadOnlyTrx;
import io.sirix.node.NodeKind;

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

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

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

  @Override
  public void reset(final long nodeKey) {
    super.reset(nodeKey);
    mNextIndex = 0;
  }

  @Override
  protected long nextKey() {
    // 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) {
      assert asXmlNodeReadTrx().getKind() == NodeKind.ATTRIBUTE;
      asXmlNodeReadTrx().moveToParent();
    }

    if (asXmlNodeReadTrx().getKind() == NodeKind.ELEMENT) {
      final XmlNodeReadOnlyTrx rtx = (XmlNodeReadOnlyTrx) asXmlNodeReadTrx();
      if (mNextIndex < rtx.getAttributeCount()) {
        final long key = rtx.getAttributeKey(mNextIndex);
        mNextIndex += 1;
        return key;
      }
    }

    return done();
  }
}