- /*
- * The Apache Software License, Version 1.1
- *
- *
- * Copyright (c) 1999-2002 The Apache Software Foundation. All rights
- * reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. 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.
- *
- * 3. The end-user documentation included with the redistribution,
- * if any, must include the following acknowledgment:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself,
- * if and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "Xerces" and "Apache Software Foundation" must
- * not be used to endorse or promote products derived from this
- * software without prior written permission. For written
- * permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache",
- * nor may "Apache" appear in their name, without prior written
- * permission of the Apache Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENCEUENTIAL 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.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation and was
- * originally based on software copyright (c) 1999, International
- * Business Machines, Inc., http://www.apache.org. For more
- * information on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- */
-
- package com.sun.org.apache.xerces.internal.impl.xs.models;
-
- import com.sun.org.apache.xerces.internal.impl.dtd.models.CMNode;
- import com.sun.org.apache.xerces.internal.impl.dtd.models.CMStateSet;
- import com.sun.org.apache.xerces.internal.impl.xs.XSModelGroupImpl;
-
- /**
- *
- * Content model Bin-Op node.
- *
- * @author Neil Graham, IBM
- * @version $$
- */
- public class XSCMBinOp extends CMNode {
- // -------------------------------------------------------------------
- // Constructors
- // -------------------------------------------------------------------
- public XSCMBinOp(int type, CMNode leftNode, CMNode rightNode)
- {
- super(type);
-
- // Insure that its one of the types we require
- if ((type() != XSModelGroupImpl.MODELGROUP_CHOICE)
- && (type() != XSModelGroupImpl.MODELGROUP_SEQUENCE)) {
- 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() == XSModelGroupImpl.MODELGROUP_CHOICE)
- return (fLeftChild.isNullable() || fRightChild.isNullable());
- else if (type() == XSModelGroupImpl.MODELGROUP_SEQUENCE)
- return (fLeftChild.isNullable() && fRightChild.isNullable());
- else
- throw new RuntimeException("ImplementationMessages.VAL_BST");
- }
-
-
- // -------------------------------------------------------------------
- // Protected, inherited methods
- // -------------------------------------------------------------------
- protected void calcFirstPos(CMStateSet toSet) {
- if (type() == XSModelGroupImpl.MODELGROUP_CHOICE) {
- // Its the the union of the first positions of our children.
- toSet.setTo(fLeftChild.firstPos());
- toSet.union(fRightChild.firstPos());
- }
- else if (type() == XSModelGroupImpl.MODELGROUP_SEQUENCE) {
- //
- // 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() == XSModelGroupImpl.MODELGROUP_CHOICE) {
- // Its the the union of the first positions of our children.
- toSet.setTo(fLeftChild.lastPos());
- toSet.union(fRightChild.lastPos());
- }
- else if (type() == XSModelGroupImpl.MODELGROUP_SEQUENCE) {
- //
- // 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;
- } // XSCMBinOp
-