ModificationNode.java

package edu.udel.cis.vsl.tass.ast.impl.expression;

import java.io.PrintWriter;
import java.util.NoSuchElementException;

import edu.udel.cis.vsl.tass.ast.IF.ASTNodeIF;
import edu.udel.cis.vsl.tass.ast.IF.AbstractSyntaxTreeIF;
import edu.udel.cis.vsl.tass.ast.IF.expression.LHSExpressionNodeIF;
import edu.udel.cis.vsl.tass.ast.IF.expression.ModificationNodeIF;

public class ModificationNode 
	extends SideEffectExpressionNode
	implements ModificationNodeIF {

	private LHSExpressionNodeIF lhs;
	
	public ModificationNode(long id) {
		super(id);
	}
	
	public ModificationNode(long id, LHSExpressionNodeIF lhs) {
		super(id);
		this.lhs = lhs;
	}

	@Override
	public LHSExpressionNodeIF lhs() {
		return lhs;
	}

	@Override
	public void setLhs(LHSExpressionNodeIF lhs) {
		this.lhs = lhs;
	}

	@Override
	public ASTNodeIF child(int index) throws NoSuchElementException {
		switch (index) {
		case 0:
			return super.child(index);
		case 1:
			return lhs;
		default:
			throw new NoSuchElementException("Node " + id()
					+ " does not have a child with index " + index + ".");
		}
	}

	@Override
	public void setChild(int i, ASTNodeIF child) throws NoSuchElementException {
		switch (i) {
		case 0:
			super.setChild(i,child);
			break;
		case 1:
			lhs = (LHSExpressionNodeIF) child;
			break;
		default:
			throw new NoSuchElementException("Node " + id()
					+ " does not have a child with index " + i + ".");
		}
	}

	@Override
	public int numChildren() {
		return 2;
	}

	@Override
	protected String nodeType() {
		return "Modification";
	}

	@Override
	public void toXml(String prefix, PrintWriter out,AbstractSyntaxTreeIF ast) {
		super.toXml(prefix,out,ast);

		out.println(prefix+"<mdn:lhs>");
		lhs.toXml(prefix+"  ",out,ast);
		out.println(prefix+"</mdn:lhs>");
	}

}