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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.diff; import java.util.Objects; import io.sirix.api.json.JsonNodeReadOnlyTrx; import io.sirix.api.json.JsonNodeTrx; import io.sirix.node.NodeKind; /** * Json diff. * * @author Johannes Lichtenberger, University of Konstanz */ final class JsonDiff extends AbstractDiff { /** * Constructor. * * @param builder {@link DiffFactory.Builder} reference */ public JsonDiff(final DiffFactory.Builder builder) { super(builder); } @Override NodeKind documentNode() { return NodeKind.JSON_DOCUMENT; } @Override boolean checkNodes(final JsonNodeReadOnlyTrx newRtx, final JsonNodeReadOnlyTrx oldRtx) { boolean found = false; if (newRtx.getNodeKey() == oldRtx.getNodeKey() && newRtx.getParentKey() == oldRtx.getParentKey() && newRtx.getKind() == oldRtx.getKind()) { found = checkNamesOrValues(newRtx, oldRtx); } return found; } private boolean checkNamesOrValues(final JsonNodeReadOnlyTrx newRtx, final JsonNodeReadOnlyTrx oldRtx) { boolean found = false; switch (newRtx.getKind()) { case ARRAY: case OBJECT: case NULL_VALUE: case OBJECT_NULL_VALUE: found = true; break; case OBJECT_KEY: if (checkNamesForEquality(newRtx, oldRtx)) found = true; break; case BOOLEAN_VALUE: case OBJECT_BOOLEAN_VALUE: if (newRtx.getBooleanValue() == oldRtx.getBooleanValue()) found = true; break; case NUMBER_VALUE: case OBJECT_NUMBER_VALUE: if (Objects.equals(newRtx.getNumberValue(), oldRtx.getNumberValue())) found = true; break; case STRING_VALUE: case OBJECT_STRING_VALUE: if (Objects.equals(newRtx.getValue(), oldRtx.getValue())) found = true; break; // $CASES-OMITTED$ default: // Do nothing. } return found; } private boolean checkNamesForEquality(JsonNodeReadOnlyTrx newRtx, JsonNodeReadOnlyTrx oldRtx) { return newRtx.getNameKey() == oldRtx.getNameKey(); } @Override void emitNonStructuralDiff(final JsonNodeReadOnlyTrx newRtx, final JsonNodeReadOnlyTrx oldRtx, final DiffDepth depth, final DiffFactory.DiffType diff) { } @Override boolean checkNodeNamesOrValues(final JsonNodeReadOnlyTrx newRtx, final JsonNodeReadOnlyTrx oldRtx) { return checkNamesOrValues(newRtx, oldRtx); } }





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