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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.Identifiable;
/**
* This abstract expression node represents the result value of execution.
*
* @author baldersheim
* @author Simon Thoresen Hult
*/
public abstract class ResultNode extends Identifiable implements Comparable<ResultNode> {
// The global class identifier shared with C++.
public static final int classId = registerClass(0x4000 + 41, ResultNode.class);
@Override
protected int onGetClassId() {
return classId;
}
@Override
public final int compareTo(ResultNode b) {
return onCmp(b);
}
@Override
public boolean equals(Object obj) {
return obj instanceof ResultNode && compareTo((ResultNode)obj) == 0;
}
/**
* This method must be implemented by all subclasses of this to allow new results to be calculated.
*
* @param rhs The node to get the result from.
*/
protected abstract void set(ResultNode rhs);
/**
* This method must be implemented by all subclasses of this to allow ordering of results. This method is used by
* the {@link Cloneable} implementation.
*
* @param rhs The other node to compare with.
* @return Comparable result.
*/
protected abstract int onCmp(ResultNode rhs);
/**
* Returns the integer representation of this result.
*
* @return The value of this.
*/
public abstract long getInteger();
/**
* Returns the float representation of this result.
*
* @return The value of this.
*/
public abstract double getFloat();
/**
* Returns the string representation of this result.
*
* @return The value of this.
*/
public abstract String getString();
/**
* Returns the raw byte array representation of this result.
*
* @return The value of this.
*/
public abstract byte[] getRaw();
/**
* Negate the value contained within the result node.
*/
public void negate() {
throw new RuntimeException("Class " + getClass().getName() + " does not implement negate");
}
}
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