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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.
/**
* 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 current result sequence that helps to
* specify, whether the result query will contain duplicates.
*/
public enum DupState {
/** State of the HiddersMichiels - automaton. */
MAX1 {
/**
* {@inheritDoc}
*/
@Override
public DupState updateDupFollPreSib() {
return DupState.GENSIB;
}
/**
* {@inheritDoc}
*/
@Override
public DupState updateDupAncestor() {
return DupState.LIN;
}
/**
* {@inheritDoc}
*/
@Override
public DupState updateDupChild() {
return DupState.GENSIB;
}
/**
* {@inheritDoc}
*/
@Override
public DupState updateDupFollPre() {
DupState.nodup = true;
return DupState.NO;
}
},
/** State of the HiddersMichiels - automaton. */
LIN {
/**
* {@inheritDoc}
*/
@Override
public DupState updateDupFollPreSib() {
return DupState.SIB;
}
/**
* {@inheritDoc}
*/
@Override
public DupState updateDupDesc() {
DupState.nodup = false;
return DupState.NO;
}
/**
* {@inheritDoc}
*/
@Override
public DupState updateDupChild() {
return DupState.NO;
}
},
/** State of the HiddersMichiels - automaton. */
GENSIB {
/**
* {@inheritDoc}
*/
@Override
public DupState updateDupParent() {
DupState.nodup = false;
return DupState.NO;
}
},
/** State of the HiddersMichiels - automaton. */
SIB {
/**
* {@inheritDoc}
*/
@Override
public DupState updateDupParent() {
DupState.nodup = false;
return DupState.NO;
}
},
/** State of the HiddersMichiels - automaton. */
NO {
/**
* {@inheritDoc}
*/
@Override
public DupState updateDupDesc() {
DupState.nodup = false;
return DupState.NO;
}
/**
* {@inheritDoc}
*/
@Override
public DupState updateDupParent() {
DupState.nodup = false;
return DupState.NO;
}
};
/** Is true, if the expression is still duplicate free. */
static boolean nodup = true;
/**
* Changes the state according to a child step.
*
* @return the updated duplicate state
*/
public DupState updateDupChild() {
return this;
}
/**
* Changes the state according to a parent step.
*
* @return the updated duplicate state
*/
public DupState updateDupParent() {
return this;
}
/**
* Changes the state according to a descendant, descendant-or-self step.
*
* @return the updated duplicate state
*/
public DupState updateDupDesc() {
return DupState.NO;
}
/**
* Changes the state according to a following /preceding step.
*
* @return the updated duplicate state
*/
public DupState updateDupFollPre() {
DupState.nodup = false;
return DupState.NO;
}
/**
* Changes the state according to a following-sibling/preceding-sibling step.
*
* @return the updated duplicate state
*/
public DupState updateDupFollPreSib() {
DupState.nodup = false;
return DupState.NO;
}
/**
* Changes the state according to a ancestor step.
*
* @return the updated duplicate state
*/
public DupState updateDupAncestor() {
DupState.nodup = false;
return DupState.NO;
}
/**
* Changes the state according to a union step.
*
* @return the updated duplicate state
*/
public DupState updateUnion() {
DupState.nodup = false;
return this;
}
}