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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.searchlib.expression;
import com.yahoo.vespa.objects.Deserializer;
import com.yahoo.vespa.objects.ObjectVisitor;
import com.yahoo.vespa.objects.Serializer;
/**
* The node is a request to retrieve the content of a document field.
*
* @author baldersheim
* @author Simon Thoresen Hult
*/
public class DocumentFieldNode extends DocumentAccessorNode {
public static final int classId = registerClass(0x4000 + 56, DocumentFieldNode.class);
private String fieldName;
private ResultNode result;
/**
* Constructs an empty result node. <b>NOTE:</b> This instance is broken until non-optional member data is set.
*/
public DocumentFieldNode() {
super();
}
/**
* Constructs an instance of this class with given field name.
*
* @param fieldName The field whose value to retrieve.
*/
public DocumentFieldNode(String fieldName) {
super();
setDocumentFieldName(fieldName);
}
/**
* Returns the name of the field whose value to retrieve.
*
* @return The field name.
*/
public String getDocumentFieldName() {
return fieldName;
}
/**
* Sets the name of the field whose value to retrieve.
*
* @param fieldName The field name to set.
* @return This, to allow chaining.
*/
public DocumentFieldNode setDocumentFieldName(String fieldName) {
if (fieldName == null) {
throw new IllegalArgumentException("Field name can not be null.");
}
this.fieldName = fieldName;
return this;
}
@Override
public ResultNode getResult() {
return result;
}
@Override
protected int onGetClassId() {
return classId;
}
@Override
protected void onSerialize(Serializer buf) {
super.onSerialize(buf);
putUtf8(buf, fieldName);
serializeOptional(buf, result);
}
@Override
protected void onDeserialize(Deserializer buf) {
super.onDeserialize(buf);
fieldName = getUtf8(buf);
result = (ResultNode)deserializeOptional(buf);
}
@Override
public int hashCode() {
return super.hashCode() + fieldName.hashCode();
}
@Override
protected boolean equalsExpression(ExpressionNode obj) {
DocumentFieldNode rhs = (DocumentFieldNode)obj;
if (!fieldName.equals(rhs.fieldName)) {
return false;
}
if (!equals(result, rhs.result)) {
return false;
}
return true;
}
@Override
public DocumentFieldNode clone() {
DocumentFieldNode obj = (DocumentFieldNode)super.clone();
if (result != null) {
obj.result = (ResultNode)result.clone();
}
return obj;
}
@Override
public void visitMembers(ObjectVisitor visitor) {
super.visitMembers(visitor);
visitor.visit("fieldName", fieldName);
visitor.visit("result", result);
}
}
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