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package com.sun.org.apache.xerces.internal.impl.dtd.models;

import com.sun.org.apache.xerces.internal.impl.dtd.XMLContentSpec;

Content model Bin-Op node.
@xerces.internal
/** * Content model Bin-Op node. * * @xerces.internal * */
public class CMBinOp extends CMNode { // ------------------------------------------------------------------- // Constructors // ------------------------------------------------------------------- public CMBinOp(int type, CMNode leftNode, CMNode rightNode) { super(type); // Insure that its one of the types we require if ((type() != XMLContentSpec.CONTENTSPECNODE_CHOICE) && (type() != XMLContentSpec.CONTENTSPECNODE_SEQ)) { throw new RuntimeException("ImplementationMessages.VAL_BST"); } // Store the nodes and init any data that needs it fLeftChild = leftNode; fRightChild = rightNode; } // ------------------------------------------------------------------- // Package, final methods // ------------------------------------------------------------------- final CMNode getLeft() { return fLeftChild; } final CMNode getRight() { return fRightChild; } // ------------------------------------------------------------------- // Package, inherited methods // ------------------------------------------------------------------- public boolean isNullable() { // // If its an alternation, then if either child is nullable then // this node is nullable. If its a concatenation, then both of // them have to be nullable. // if (type() == XMLContentSpec.CONTENTSPECNODE_CHOICE) return (fLeftChild.isNullable() || fRightChild.isNullable()); else if (type() == XMLContentSpec.CONTENTSPECNODE_SEQ) return (fLeftChild.isNullable() && fRightChild.isNullable()); else throw new RuntimeException("ImplementationMessages.VAL_BST"); } // ------------------------------------------------------------------- // Protected, inherited methods // ------------------------------------------------------------------- protected void calcFirstPos(CMStateSet toSet) { if (type() == XMLContentSpec.CONTENTSPECNODE_CHOICE) { // Its the the union of the first positions of our children. toSet.setTo(fLeftChild.firstPos()); toSet.union(fRightChild.firstPos()); } else if (type() == XMLContentSpec.CONTENTSPECNODE_SEQ) { // // If our left child is nullable, then its the union of our // children's first positions. Else is our left child's first // positions. // toSet.setTo(fLeftChild.firstPos()); if (fLeftChild.isNullable()) toSet.union(fRightChild.firstPos()); } else { throw new RuntimeException("ImplementationMessages.VAL_BST"); } } protected void calcLastPos(CMStateSet toSet) { if (type() == XMLContentSpec.CONTENTSPECNODE_CHOICE) { // Its the the union of the first positions of our children. toSet.setTo(fLeftChild.lastPos()); toSet.union(fRightChild.lastPos()); } else if (type() == XMLContentSpec.CONTENTSPECNODE_SEQ) { // // If our right child is nullable, then its the union of our // children's last positions. Else is our right child's last // positions. // toSet.setTo(fRightChild.lastPos()); if (fRightChild.isNullable()) toSet.union(fLeftChild.lastPos()); } else { throw new RuntimeException("ImplementationMessages.VAL_BST"); } } // ------------------------------------------------------------------- // Private data members // // fLeftChild // fRightChild // These are the references to the two nodes that are on either // side of this binary operation. // ------------------------------------------------------------------- private CMNode fLeftChild; private CMNode fRightChild; };