/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* $Id: TransformSnapshotImpl.java,v 1.11 2004/02/16 20:41:29 minchau Exp $
*/
package org.apache.xalan.transformer;
import java.util.Enumeration;
import java.util.Stack;
import org.apache.xml.dtm.DTMIterator;
import org.apache.xml.utils.BoolStack;
import org.apache.xml.utils.IntStack;
import org.apache.xml.utils.NamespaceSupport2;
import org.apache.xml.utils.NodeVector;
import org.apache.xml.utils.ObjectStack;
import org.apache.xpath.VariableStack;
import org.apache.xpath.XPathContext;
import org.xml.sax.helpers.NamespaceSupport;
import org.apache.xml.serializer.NamespaceMappings;
import org.apache.xml.serializer.SerializationHandler;
/**
* This class holds a "snapshot" of it's current transformer state,
* which can later be restored.
*
* This only saves state which can change over the course of the side-effect-free
* (i.e. no extensions that call setURIResolver, etc.).
*
* @deprecated It doesn't look like this code, which is for tooling, has
* functioned propery for a while, so it doesn't look like it is being used.
*/
class TransformSnapshotImpl implements TransformSnapshot
{
/**
* The stack of Variable stack frames.
*/
private VariableStack m_variableStacks;
/**
* The stack of <a href="http://www.w3.org/TR/xslt#dt-current-node">current node</a> objects.
* Not to be confused with the current node list.
*/
private IntStack m_currentNodes;
/** A stack of the current sub-expression nodes. */
private IntStack m_currentExpressionNodes;
/**
* The current context node lists stack.
*/
private Stack m_contextNodeLists;
/**
* The current context node list.
*/
private DTMIterator m_contextNodeList;
/**
* Stack of AxesIterators.
*/
private Stack m_axesIteratorStack;
/**
* Is > 0 when we're processing a for-each.
*/
private BoolStack m_currentTemplateRuleIsNull;
/**
* A node vector used as a stack to track the current
* ElemTemplateElement. Needed for the
* org.apache.xalan.transformer.TransformState interface,
* so a tool can discover the calling template.
*/
private ObjectStack m_currentTemplateElements;
/**
* A node vector used as a stack to track the current
* ElemTemplate that was matched, as well as the node that
* was matched. Needed for the
* org.apache.xalan.transformer.TransformState interface,
* so a tool can discover the matched template, and matched
* node.
*/
private Stack m_currentMatchTemplates;
/**
* A node vector used as a stack to track the current
* ElemTemplate that was matched, as well as the node that
* was matched. Needed for the
* org.apache.xalan.transformer.TransformState interface,
* so a tool can discover the matched template, and matched
* node.
*/
private NodeVector m_currentMatchNodes;
/**
* The table of counters for xsl:number support.
* @see ElemNumber
*/
private CountersTable m_countersTable;
/**
* Stack for the purposes of flagging infinite recursion with
* attribute sets.
*/
private Stack m_attrSetStack;
/** Indicate whether a namespace context was pushed */
boolean m_nsContextPushed;
/**
* Use the SAX2 helper class to track result namespaces.
*/
private NamespaceMappings m_nsSupport;
/** The number of events queued */
// int m_eventCount;
/**
* Constructor TransformSnapshotImpl
* Take a snapshot of the currently executing context.
*
* @param transformer Non null transformer instance
* @deprecated It doesn't look like this code, which is for tooling, has
* functioned propery for a while, so it doesn't look like it is being used.
*/
TransformSnapshotImpl(TransformerImpl transformer)
{
try
{
// Are all these clones deep enough?
SerializationHandler rtf = transformer.getResultTreeHandler();
{
// save serializer fields
m_nsSupport = (NamespaceMappings)rtf.getNamespaceMappings().clone();
// Do other fields need to be saved/restored?
}
XPathContext xpc = transformer.getXPathContext();
m_variableStacks = (VariableStack) xpc.getVarStack().clone();
m_currentNodes = (IntStack) xpc.getCurrentNodeStack().clone();
m_currentExpressionNodes =
(IntStack) xpc.getCurrentExpressionNodeStack().clone();
m_contextNodeLists = (Stack) xpc.getContextNodeListsStack().clone();
if (!m_contextNodeLists.empty())
m_contextNodeList =
(DTMIterator) xpc.getContextNodeList().clone();
m_axesIteratorStack = (Stack) xpc.getAxesIteratorStackStacks().clone();
m_currentTemplateRuleIsNull =
(BoolStack) transformer.m_currentTemplateRuleIsNull.clone();
m_currentTemplateElements =
(ObjectStack) transformer.m_currentTemplateElements.clone();
m_currentMatchTemplates =
(Stack) transformer.m_currentMatchTemplates.clone();
m_currentMatchNodes =
(NodeVector) transformer.m_currentMatchedNodes.clone();
m_countersTable =
(CountersTable) transformer.getCountersTable().clone();
if (transformer.m_attrSetStack != null)
m_attrSetStack = (Stack) transformer.m_attrSetStack.clone();
}
catch (CloneNotSupportedException cnse)
{
throw new org.apache.xml.utils.WrappedRuntimeException(cnse);
}
}
/**
* This will reset the stylesheet to a given execution context
* based on some previously taken snapshot where we can then start execution
*
* @param transformer Non null transformer instance
*
* @deprecated It doesn't look like this code, which is for tooling, has
* functioned propery for a while, so it doesn't look like it is being used.
*/
void apply(TransformerImpl transformer)
{
try
{
// Are all these clones deep enough?
SerializationHandler rtf = transformer.getResultTreeHandler();
if (rtf != null)
{
// restore serializer fields
rtf.setNamespaceMappings((NamespaceMappings)m_nsSupport.clone());
}
XPathContext xpc = transformer.getXPathContext();
xpc.setVarStack((VariableStack) m_variableStacks.clone());
xpc.setCurrentNodeStack((IntStack) m_currentNodes.clone());
xpc.setCurrentExpressionNodeStack(
(IntStack) m_currentExpressionNodes.clone());
xpc.setContextNodeListsStack((Stack) m_contextNodeLists.clone());
if (m_contextNodeList != null)
xpc.pushContextNodeList((DTMIterator) m_contextNodeList.clone());
xpc.setAxesIteratorStackStacks((Stack) m_axesIteratorStack.clone());
transformer.m_currentTemplateRuleIsNull =
(BoolStack) m_currentTemplateRuleIsNull.clone();
transformer.m_currentTemplateElements =
(ObjectStack) m_currentTemplateElements.clone();
transformer.m_currentMatchTemplates =
(Stack) m_currentMatchTemplates.clone();
transformer.m_currentMatchedNodes =
(NodeVector) m_currentMatchNodes.clone();
transformer.m_countersTable = (CountersTable) m_countersTable.clone();
if (m_attrSetStack != null)
transformer.m_attrSetStack = (Stack) m_attrSetStack.clone();
}
catch (CloneNotSupportedException cnse)
{
throw new org.apache.xml.utils.WrappedRuntimeException(cnse);
}
}
}