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This OSGi bundle wraps poi, poi-contrib, poi-ooxml, poi-ooxml-schemas and poi-scratchpad ${pkgVersion} jar files.

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/*
* Copyright (c) 2005, Graph Builder
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* * Neither the name of Graph Builder nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.

* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

package com.graphbuilder.math;

/**
A node of an expression tree that has exactly 2 children, a left child and a right child.  After the
children are evaluated, a mathematical operation is applied and the result is returned.
*/
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;
	}

	/**
	Returns the text symbol that represents the operation.
	*/
	public abstract String getSymbol();
}