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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.config.protocol;
import com.yahoo.slime.Cursor;
import com.yahoo.yolean.trace.TraceNode;
import com.yahoo.yolean.trace.TraceVisitor;
import java.util.ArrayDeque;
import java.util.Deque;
import java.util.Iterator;
/**
* Serialize a {@link TraceNode} to {@link com.yahoo.slime.Slime}.
*
* @author Ulf Lilleengen
*/
public class SlimeTraceSerializer extends TraceVisitor {
static final String TIMESTAMP = "timestamp";
static final String PAYLOAD = "payload";
static final String CHILDREN = "children";
final Deque<Cursor> cursors = new ArrayDeque<>();
public SlimeTraceSerializer(Cursor cursor) {
cursors.push(cursor);
}
@Override
public void visit(TraceNode node) {
Cursor current = cursors.pop();
current.setLong(TIMESTAMP, node.timestamp());
encodePayload(current, node.payload());
addChildrenCursors(current, node);
}
private void encodePayload(Cursor current, Object payload) {
if (payload instanceof String) {
current.setString(PAYLOAD, (String)payload);
} else if (payload instanceof Long) {
current.setLong(PAYLOAD, (Long) payload);
} else if (payload instanceof Boolean) {
current.setBool(PAYLOAD, (Boolean) payload);
} else if (payload instanceof Double) {
current.setDouble(PAYLOAD, (Double) payload);
} else if (payload instanceof byte[]) {
current.setData(PAYLOAD, (byte[]) payload);
}
}
private void addChildrenCursors(Cursor current, TraceNode node) {
Iterator<TraceNode> it = node.children().iterator();
if (it.hasNext()) {
Cursor childrenArray = current.setArray(CHILDREN);
while (it.hasNext()) {
cursors.push(childrenArray.addObject());
it.next();
}
}
}
}
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