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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.searchlib.expression;
import com.yahoo.vespa.objects.Deserializer;
import com.yahoo.vespa.objects.ObjectVisitor;
import com.yahoo.vespa.objects.Serializer;
/**
* This abstract expression node represents a function to execute.
*
* @author baldersheim
* @author Simon Thoresen Hult
*/
public class ConstantNode extends ExpressionNode {
public static final int classId = registerClass(0x4000 + 49, ConstantNode.class, ConstantNode::new);
private ResultNode value = null;
public ConstantNode() {}
public ConstantNode(ResultNode value) {
this.value = value;
}
public ResultNode getValue() {
return value;
}
@Override
protected int onGetClassId() {
return classId;
}
@Override
protected void onSerialize(Serializer buf) {
super.onSerialize(buf);
serializeOptional(buf, value);
}
@Override
protected void onDeserialize(Deserializer buf) {
super.onDeserialize(buf);
value = (ResultNode)deserializeOptional(buf);
}
@Override
public ConstantNode clone() {
ConstantNode obj = (ConstantNode)super.clone();
if (value != null) {
obj.value = (ResultNode)value.clone();
}
return obj;
}
@Override
public void visitMembers(ObjectVisitor visitor) {
super.visitMembers(visitor);
visitor.visit("value", value);
}
@Override
protected void onPrepare() {
}
@Override
protected boolean onExecute() {
return true;
}
@Override
public ResultNode getResult() {
return value;
}
@Override
protected boolean equalsExpression(ExpressionNode obj) {
return equals(value, ((ConstantNode)obj).value);
}
}
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