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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 function is an instruction to retrieve the value of a named attribute.
*
* @author baldersheim
* @author Simon Thoresen Hult
*/
public class AttributeNode extends FunctionNode {
public static final int classId = registerClass(0x4000 + 55, AttributeNode.class, AttributeNode::new);
private String attribute;
/**
* Constructs an empty result node. <b>NOTE:</b> This instance is broken until non-optional member data is set.
*/
public AttributeNode() { }
/**
* Constructs an instance of this class with given attribute name.
*
* @param attribute The attribute to retrieve.
*/
public AttributeNode(String attribute) {
setAttributeName(attribute);
}
/**
* Returns the name of the attribute whose value this function is to retrieve.
*
* @return The attribute name.
*/
public String getAttributeName() {
return attribute;
}
/**
* Sets the name of the attribute whose value this function is to retrieve.
*
* @param attribute The attribute to retrieve.
* @return This, to allow chaining.
*/
public AttributeNode setAttributeName(String attribute) {
if (attribute == null) {
throw new IllegalArgumentException("Attribute name can not be null.");
}
this.attribute = attribute;
return this;
}
@Override
protected int onGetClassId() {
return classId;
}
@Override
protected void onSerialize(Serializer buf) {
super.onSerialize(buf);
putUtf8(buf, attribute);
}
@Override
protected void onDeserialize(Deserializer buf) {
super.onDeserialize(buf);
attribute = getUtf8(buf);
}
@Override
public int hashCode() {
return super.hashCode() + attribute.hashCode();
}
@Override
protected boolean equalsFunction(FunctionNode obj) {
return attribute.equals(((AttributeNode)obj).attribute);
}
@Override
public void visitMembers(ObjectVisitor visitor) {
super.visitMembers(visitor);
visitor.visit("attribute", attribute);
}
}
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