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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.service.xml.xpath;
/**
* Enum represents different states of the result order that help to specify, if the result query
* will be in document order or not.
*/
public enum OrdState {
/** State of the HiddersMichiels - automaton. */
LIN {
/**
* {@inheritDoc}
*/
@Override
public OrdState updateOrdChild() {
mOrdRank++;
return this;
}
/**
* {@inheritDoc}
*/
@Override
public OrdState updateOrdParent() {
if (mOrdRank > 0) {
mOrdRank--;
}
return this;
}
},
/** State of the HiddersMichiels - automaton. */
MAX1 {
/**
* {@inheritDoc}
*/
@Override
public OrdState updateOrdChild() {
return OrdState.GENSIB;
}
/**
* {@inheritDoc}
*/
@Override
public OrdState updateOrdDesc() {
return OrdState.SIB;
}
/**
* {@inheritDoc}
*/
@Override
public OrdState updateOrdFollPre() {
return OrdState.SIB;
}
/**
* {@inheritDoc}
*/
@Override
public OrdState updateOrdFollPreSib() {
return OrdState.GENSIB;
}
/**
* {@inheritDoc}
*/
@Override
public OrdState updateOrdAncestor() {
return OrdState.LIN;
}
},
/** State of the HiddersMichiels - automaton. */
GENSIB {
/**
* {@inheritDoc}
*/
@Override
public OrdState updateOrdChild() {
return this;
}
/**
* {@inheritDoc}
*/
@Override
public OrdState updateOrdParent() {
return OrdState.GEN;
}
/**
* {@inheritDoc}
*/
@Override
public OrdState updateOrdDesc() {
return OrdState.SIB;
}
/**
* {@inheritDoc}
*/
@Override
public OrdState updateOrdFollPreSib() {
mOrdRank++;
return OrdState.GEN;
}
},
/** State of the HiddersMichiels - automaton. */
GEN {
/**
* {@inheritDoc}
*/
@Override
public OrdState updateOrdChild() {
mOrdRank++;
return this;
}
/**
* {@inheritDoc}
*/
@Override
public OrdState updateOrdParent() {
if (mOrdRank > 0) {
mOrdRank--;
}
return this;
}
},
/** State of the HiddersMichiels - automaton. */
SIB {
/**
* {@inheritDoc}
*/
@Override
public OrdState updateOrdChild() {
mOrdRank++;
return this;
}
/**
* {@inheritDoc}
*/
@Override
public OrdState updateOrdParent() {
if (mOrdRank > 0) {
mOrdRank--;
return this;
} else {
return OrdState.UNORD;
}
}
},
/** State of the HiddersMichiels - automaton. */
UNORD;
/**
* If mOrderRank is 0, the result sequence will be in document order. If it is greater than 0 it
* is not any more, but it can retain the ordered property, if a certain sequence of axis follows.
* For more details see [Hidders, J., Michiels, P., "Avoiding Unnecessary Ordering Operations in
* XPath", 2003]
*/
static int mOrdRank;
/**
* Changes the state according to a child step.
*
* @return the updated order state
*/
public OrdState updateOrdChild() {
mOrdRank++;
return this;
}
/**
* Changes the state according to a union step.
*
* @return the updated order state
*/
public OrdState updateOrdUnion() {
return OrdState.UNORD;
}
/**
* Changes the state according to a parent step.
*
* @return the updated order state
*/
public OrdState updateOrdParent() {
return this;
}
/**
* Changes the state according to a descendant/ descendant-or.self step.
*
* @return the updated order state
*/
public OrdState updateOrdDesc() {
return OrdState.UNORD;
}
/**
* Changes the state according to a following/preceding step.
*
* @return the updated order state
*/
public OrdState updateOrdFollPre() {
return OrdState.UNORD;
}
/**
* Changes the state according to a following-sibling/preceding-sibling step.
*
* @return the updated order state
*/
public OrdState updateOrdFollPreSib() {
if (mOrdRank == 0) {
mOrdRank++;
}
return this;
}
/**
* Changes the state according to a ancestor step.
*
* @return the updated order state
*/
public OrdState updateOrdAncestor() {
return OrdState.UNORD;
}
/**
* Initializes the order state.
*/
public void init() {
mOrdRank = 0;
}
}
