org.apache.vxquery.datamodel.builders.nodes.NodeSubTreeBuilder Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.vxquery.datamodel.builders.nodes;
import java.io.DataOutput;
import java.io.IOException;
import org.apache.vxquery.datamodel.accessors.TaggedValuePointable;
import org.apache.vxquery.datamodel.accessors.nodes.NodeTreePointable;
import org.apache.vxquery.datamodel.values.ValueTag;
import edu.uci.ics.hyracks.data.std.api.IMutableValueStorage;
public class NodeSubTreeBuilder extends AbstractNodeBuilder {
private DataOutput mainOut;
@Override
public void reset(IMutableValueStorage mvs) throws IOException {
mainOut = mvs.getDataOutput();
mainOut.write(ValueTag.NODE_TREE_TAG);
}
@Override
public void finish() throws IOException {
}
public void setChildNode(NodeTreePointable ntp, TaggedValuePointable itemTvp) throws IOException {
boolean hasDictionary = ntp.dictionaryExists() && hasDictionary(itemTvp.getTag());
byte header = (byte) (hasDictionary ? NodeTreePointable.HEADER_DICTIONARY_EXISTS_MASK : 0);
// TODO add all header flags to this setting.
boolean hasNodeIds = ntp.nodeIdExists();
if (hasNodeIds) {
header |= NodeTreePointable.HEADER_NODEID_EXISTS_MASK;
}
mainOut.write(header);
if (hasNodeIds) {
mainOut.writeInt(ntp.getRootNodeId());
}
if (hasDictionary) {
mainOut.write(ntp.getByteArray(), ntp.getDictionaryOffset(), ntp.getDictionarySize());
}
mainOut.write(itemTvp.getByteArray(), itemTvp.getStartOffset(), itemTvp.getLength());
}
private boolean hasDictionary(byte tag) {
switch (tag) {
case ValueTag.ATTRIBUTE_NODE_TAG:
case ValueTag.DOCUMENT_NODE_TAG:
case ValueTag.ELEMENT_NODE_TAG:
return true;
}
return false;
}
}