| /* |
| * The Apache Software License, Version 1.1 |
| * |
| * |
| * Copyright (c) 1999 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 "Xalan" 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 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. |
| * ==================================================================== |
| * |
| * 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, Lotus |
| * Development Corporation., http://www.lotus.com. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| */ |
| package org.apache.xpath.seqctor; |
| |
| import java.util.Vector; |
| |
| import javax.xml.transform.TransformerException; |
| |
| import org.apache.xml.utils.WrappedRuntimeException; |
| import org.apache.xpath.Expression; |
| import org.apache.xpath.XPathContext; |
| import org.apache.xpath.objects.XObject; |
| import org.apache.xpath.objects.XSequence; |
| import org.apache.xpath.objects.XSequenceCachedBase; |
| |
| /** |
| * The responsibility of enclosing_type is to . |
| * |
| * Created Jul 20, 2002 |
| * @author sboag |
| */ |
| public class ExprSequenceIter extends XSequenceCachedBase |
| { |
| protected Vector m_exprs; |
| // XSequence[] m_xsequences; |
| int m_exprsIndex = 0; |
| private XSequence m_containedIterator; |
| private XObject m_contextItem; |
| |
| /** |
| * Constructor for ExprSequenceIter. |
| */ |
| public ExprSequenceIter(Vector exprs, XPathContext xctxt) |
| { |
| super(xctxt); |
| this.setShouldCache(true); // for now! |
| m_exprs = exprs; |
| m_contextItem = xctxt.getCurrentItem(); |
| } |
| |
| /** |
| * @see org.apache.xpath.objects.XSequence#getNext() |
| */ |
| public XObject getNext() |
| { |
| XObject xobj; |
| try |
| { |
| m_xctxt.pushCurrentItem(m_contextItem); |
| if (null != m_containedIterator) |
| { |
| xobj = m_containedIterator.next(); |
| if (null != xobj) |
| { |
| return xobj; |
| } |
| else |
| { |
| m_containedIterator = null; |
| } |
| } |
| |
| if (m_exprsIndex >= m_exprs.size()) |
| return null; |
| Expression expr = (Expression) m_exprs.elementAt(m_exprsIndex); |
| m_exprsIndex++; |
| xobj = expr.execute(m_xctxt); |
| if (xobj.isSequenceProper()) |
| { |
| m_containedIterator = (XSequence) xobj; |
| return getNext(); |
| } |
| else |
| return xobj; |
| } |
| catch (TransformerException e) |
| { |
| throw new WrappedRuntimeException(e); |
| } |
| finally |
| { |
| m_xctxt.popCurrentItem(); |
| } |
| } |
| |
| /** |
| * @see org.apache.xpath.objects.XSequence#getPrevious() |
| */ |
| public XObject getPrevious() |
| { |
| throw new RuntimeException("ExprSequence can not go backwards without cacheing!"); |
| } |
| |
| /** |
| * @see org.apache.xpath.objects.XObject#reset() |
| */ |
| public void reset() |
| { |
| super.reset(); |
| m_exprsIndex = 0; |
| } |
| |
| } |