OpNode.java

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package com.graphbuilder.math;

public abstract class OpNode extends Expression {

    protected Expression leftChild = null;
    protected Expression rightChild = null;

    public OpNode(Expression leftChild, Expression rightChild) {
        setLeftChild(leftChild);
        setRightChild(rightChild);
    }

    public void setLeftChild(Expression x) {
        checkBeforeAccept(x);
        if (leftChild != null)
            leftChild.parent = null;
        x.parent = this;
        leftChild = x;
    }

    public void setRightChild(Expression x) {
        checkBeforeAccept(x);
        if (rightChild != null)
            rightChild.parent = null;
        x.parent = this;
        rightChild = x;
    }

    public Expression getLeftChild() {
        return leftChild;
    }

    public Expression getRightChild() {
        return rightChild;
    }

    public abstract String getSymbol();
}