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Java example source code file (NodeSetDTM.java)
This example Java source code file (NodeSetDTM.java) is included in the alvinalexander.com
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The NodeSetDTM.java Java example source code
/*
* reserved comment block
* DO NOT REMOVE OR ALTER!
*/
/*
* 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: NodeSetDTM.java,v 1.2.4.2 2005/09/14 20:30:06 jeffsuttor Exp $
*/
package com.sun.org.apache.xpath.internal;
import com.sun.org.apache.xalan.internal.res.XSLMessages;
import com.sun.org.apache.xml.internal.dtm.DTM;
import com.sun.org.apache.xml.internal.dtm.DTMFilter;
import com.sun.org.apache.xml.internal.dtm.DTMIterator;
import com.sun.org.apache.xml.internal.dtm.DTMManager;
import com.sun.org.apache.xml.internal.utils.NodeVector;
import com.sun.org.apache.xpath.internal.res.XPATHErrorResources;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.traversal.NodeIterator;
/**
* <p>The NodeSetDTM class can act as either a NodeVector,
* NodeList, or NodeIterator. However, in order for it to
* act as a NodeVector or NodeList, it's required that
* setShouldCacheNodes(true) be called before the first
* nextNode() is called, in order that nodes can be added
* as they are fetched. Derived classes that implement iterators
* must override runTo(int index), in order that they may
* run the iteration to the given index. </p>
*
* <p>Note that we directly implement the DOM's NodeIterator
* interface. We do not emulate all the behavior of the
* standard NodeIterator. In particular, we do not guarantee
* to present a "live view" of the document ... but in XSLT,
* the source document should never be mutated, so this should
* never be an issue.</p>
*
* <p>Thought: Should NodeSetDTM really implement NodeList and NodeIterator,
* or should there be specific subclasses of it which do so? The
* advantage of doing it all here is that all NodeSetDTMs will respond
* to the same calls; the disadvantage is that some of them may return
* less-than-enlightening results when you do so.</p>
* @xsl.usage advanced
*/
public class NodeSetDTM extends NodeVector
implements /* NodeList, NodeIterator, */ DTMIterator,
Cloneable
{
static final long serialVersionUID = 7686480133331317070L;
/**
* Create an empty nodelist.
*/
public NodeSetDTM(DTMManager dtmManager)
{
super();
m_manager = dtmManager;
}
/**
* Create an empty, using the given block size.
*
* @param blocksize Size of blocks to allocate
* @param dummy pass zero for right now...
*/
public NodeSetDTM(int blocksize, int dummy, DTMManager dtmManager)
{
super(blocksize);
m_manager = dtmManager;
}
// %TBD%
// /**
// * Create a NodeSetDTM, and copy the members of the
// * given nodelist into it.
// *
// * @param nodelist List of Nodes to be made members of the new set.
// */
// public NodeSetDTM(NodeList nodelist)
// {
//
// super();
//
// addNodes(nodelist);
// }
/**
* Create a NodeSetDTM, and copy the members of the
* given NodeSetDTM into it.
*
* @param nodelist Set of Nodes to be made members of the new set.
*/
public NodeSetDTM(NodeSetDTM nodelist)
{
super();
m_manager = nodelist.getDTMManager();
m_root = nodelist.getRoot();
addNodes((DTMIterator) nodelist);
}
/**
* Create a NodeSetDTM, and copy the members of the
* given DTMIterator into it.
*
* @param ni Iterator which yields Nodes to be made members of the new set.
*/
public NodeSetDTM(DTMIterator ni)
{
super();
m_manager = ni.getDTMManager();
m_root = ni.getRoot();
addNodes(ni);
}
/**
* Create a NodeSetDTM, and copy the members of the
* given DTMIterator into it.
*
* @param iterator Iterator which yields Nodes to be made members of the new set.
*/
public NodeSetDTM(NodeIterator iterator, XPathContext xctxt)
{
super();
Node node;
m_manager = xctxt.getDTMManager();
while (null != (node = iterator.nextNode()))
{
int handle = xctxt.getDTMHandleFromNode(node);
addNodeInDocOrder(handle, xctxt);
}
}
/**
* Create a NodeSetDTM, and copy the members of the
* given DTMIterator into it.
*
*/
public NodeSetDTM(NodeList nodeList, XPathContext xctxt)
{
super();
m_manager = xctxt.getDTMManager();
int n = nodeList.getLength();
for (int i = 0; i < n; i++)
{
Node node = nodeList.item(i);
int handle = xctxt.getDTMHandleFromNode(node);
// Do not reorder or strip duplicate nodes from the given DOM nodelist
addNode(handle); // addNodeInDocOrder(handle, xctxt);
}
}
/**
* Create a NodeSetDTM which contains the given Node.
*
* @param node Single node to be added to the new set.
*/
public NodeSetDTM(int node, DTMManager dtmManager)
{
super();
m_manager = dtmManager;
addNode(node);
}
/**
* Set the environment in which this iterator operates, which should provide:
* a node (the context node... same value as "root" defined below)
* a pair of non-zero positive integers (the context position and the context size)
* a set of variable bindings
* a function library
* the set of namespace declarations in scope for the expression.
*
* <p>At this time the exact implementation of this environment is application
* dependent. Probably a proper interface will be created fairly soon.</p>
*
* @param environment The environment object.
*/
public void setEnvironment(Object environment)
{
// no-op
}
/**
* @return The root node of the Iterator, as specified when it was created.
* For non-Iterator NodeSetDTMs, this will be null.
*/
public int getRoot()
{
if(DTM.NULL == m_root)
{
if(size() > 0)
return item(0);
else
return DTM.NULL;
}
else
return m_root;
}
/**
* Initialize the context values for this expression
* after it is cloned.
*
* @param context The XPath runtime context for this
* transformation.
*/
public void setRoot(int context, Object environment)
{
// no-op, I guess... (-sb)
}
/**
* Clone this NodeSetDTM.
* At this time, we only expect this to be used with LocPathIterators;
* it may not work with other kinds of NodeSetDTMs.
*
* @return a new NodeSetDTM of the same type, having the same state...
* though unless overridden in the subclasses, it may not copy all
* the state information.
*
* @throws CloneNotSupportedException if this subclass of NodeSetDTM
* does not support the clone() operation.
*/
public Object clone() throws CloneNotSupportedException
{
NodeSetDTM clone = (NodeSetDTM) super.clone();
return clone;
}
/**
* Get a cloned Iterator, and reset its state to the beginning of the
* iteration.
*
* @return a new NodeSetDTM of the same type, having the same state...
* except that the reset() operation has been called.
*
* @throws CloneNotSupportedException if this subclass of NodeSetDTM
* does not support the clone() operation.
*/
public DTMIterator cloneWithReset() throws CloneNotSupportedException
{
NodeSetDTM clone = (NodeSetDTM) clone();
clone.reset();
return clone;
}
/**
* Reset the iterator. May have no effect on non-iterator Nodesets.
*/
public void reset()
{
m_next = 0;
}
/**
* This attribute determines which node types are presented via the
* iterator. The available set of constants is defined in the
* <code>DTMFilter interface. For NodeSetDTMs, the mask has been
* hardcoded to show all nodes except EntityReference nodes, which have
* no equivalent in the XPath data model.
*
* @return integer used as a bit-array, containing flags defined in
* the DOM's DTMFilter class. The value will be
* <code>SHOW_ALL & ~SHOW_ENTITY_REFERENCE, meaning that
* only entity references are suppressed.
*/
public int getWhatToShow()
{
return DTMFilter.SHOW_ALL & ~DTMFilter.SHOW_ENTITY_REFERENCE;
}
/**
* The filter object used to screen nodes. Filters are applied to
* further reduce (and restructure) the DTMIterator's view of the
* document. In our case, we will be using hardcoded filters built
* into our iterators... but getFilter() is part of the DOM's
* DTMIterator interface, so we have to support it.
*
* @return null, which is slightly misleading. True, there is no
* user-written filter object, but in fact we are doing some very
* sophisticated custom filtering. A DOM purist might suggest
* returning a placeholder object just to indicate that this is
* not going to return all nodes selected by whatToShow.
*/
public DTMFilter getFilter()
{
return null;
}
/**
* The value of this flag determines whether the children of entity
* reference nodes are visible to the iterator. If false, they will be
* skipped over.
* <br> To produce a view of the document that has entity references
* expanded and does not expose the entity reference node itself, use the
* whatToShow flags to hide the entity reference node and set
* expandEntityReferences to true when creating the iterator. To produce
* a view of the document that has entity reference nodes but no entity
* expansion, use the whatToShow flags to show the entity reference node
* and set expandEntityReferences to false.
*
* @return true for all iterators based on NodeSetDTM, meaning that the
* contents of EntityRefrence nodes may be returned (though whatToShow
* says that the EntityReferences themselves are not shown.)
*/
public boolean getExpandEntityReferences()
{
return true;
}
/**
* Get an instance of a DTM that "owns" a node handle. Since a node
* iterator may be passed without a DTMManager, this allows the
* caller to easily get the DTM using just the iterator.
*
* @param nodeHandle the nodeHandle.
*
* @return a non-null DTM reference.
*/
public DTM getDTM(int nodeHandle)
{
return m_manager.getDTM(nodeHandle);
}
/* An instance of the DTMManager. */
DTMManager m_manager;
/**
* Get an instance of the DTMManager. Since a node
* iterator may be passed without a DTMManager, this allows the
* caller to easily get the DTMManager using just the iterator.
*
* @return a non-null DTMManager reference.
*/
public DTMManager getDTMManager()
{
return m_manager;
}
/**
* Returns the next node in the set and advances the position of the
* iterator in the set. After a DTMIterator is created, the first call
* to nextNode() returns the first node in the set.
* @return The next <code>Node in the set being iterated over, or
* <code>DTM.NULL if there are no more members in that set.
* @throws DOMException
* INVALID_STATE_ERR: Raised if this method is called after the
* <code>detach method was invoked.
*/
public int nextNode()
{
if ((m_next) < this.size())
{
int next = this.elementAt(m_next);
m_next++;
return next;
}
else
return DTM.NULL;
}
/**
* Returns the previous node in the set and moves the position of the
* iterator backwards in the set.
* @return The previous <code>Node in the set being iterated over,
* or<code>DTM.NULL if there are no more members in that set.
* @throws DOMException
* INVALID_STATE_ERR: Raised if this method is called after the
* <code>detach method was invoked.
* @throws RuntimeException thrown if this NodeSetDTM is not of
* a cached type, and hence doesn't know what the previous node was.
*/
public int previousNode()
{
if (!m_cacheNodes)
throw new RuntimeException(
XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_CANNOT_ITERATE, null)); //"This NodeSetDTM can not iterate to a previous node!");
if ((m_next - 1) > 0)
{
m_next--;
return this.elementAt(m_next);
}
else
return DTM.NULL;
}
/**
* Detaches the iterator from the set which it iterated over, releasing
* any computational resources and placing the iterator in the INVALID
* state. After<code>detach has been invoked, calls to
* <code>nextNode orpreviousNode will raise the
* exception INVALID_STATE_ERR.
* <p>
* This operation is a no-op in NodeSetDTM, and will not cause
* INVALID_STATE_ERR to be raised by later operations.
* </p>
*/
public void detach(){}
/**
* Specify if it's OK for detach to release the iterator for reuse.
*
* @param allowRelease true if it is OK for detach to release this iterator
* for pooling.
*/
public void allowDetachToRelease(boolean allowRelease)
{
// no action for right now.
}
/**
* Tells if this NodeSetDTM is "fresh", in other words, if
* the first nextNode() that is called will return the
* first node in the set.
*
* @return true if nextNode() would return the first node in the set,
* false if it would return a later one.
*/
public boolean isFresh()
{
return (m_next == 0);
}
/**
* If an index is requested, NodeSetDTM will call this method
* to run the iterator to the index. By default this sets
* m_next to the index. If the index argument is -1, this
* signals that the iterator should be run to the end.
*
* @param index Position to advance (or retreat) to, with
* 0 requesting the reset ("fresh") position and -1 (or indeed
* any out-of-bounds value) requesting the final position.
* @throws RuntimeException thrown if this NodeSetDTM is not
* one of the types which supports indexing/counting.
*/
public void runTo(int index)
{
if (!m_cacheNodes)
throw new RuntimeException(
XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_CANNOT_INDEX, null)); //"This NodeSetDTM can not do indexing or counting functions!");
if ((index >= 0) && (m_next < m_firstFree))
m_next = index;
else
m_next = m_firstFree - 1;
}
/**
* Returns the <code>indexth item in the collection. If
* <code>index is greater than or equal to the number of nodes in
* the list, this returns <code>null.
*
* TODO: What happens if index is out of range?
*
* @param index Index into the collection.
* @return The node at the <code>indexth position in the
* <code>NodeList, or null if that is not a valid
* index.
*/
public int item(int index)
{
runTo(index);
return this.elementAt(index);
}
/**
* The number of nodes in the list. The range of valid child node indices is
* 0 to <code>length-1 inclusive. Note that this operation requires
* finding all the matching nodes, which may defeat attempts to defer
* that work.
*
* @return integer indicating how many nodes are represented by this list.
*/
public int getLength()
{
runTo(-1);
return this.size();
}
/**
* Add a node to the NodeSetDTM. Not all types of NodeSetDTMs support this
* operation
*
* @param n Node to be added
* @throws RuntimeException thrown if this NodeSetDTM is not of
* a mutable type.
*/
public void addNode(int n)
{
if (!m_mutable)
throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");
this.addElement(n);
}
/**
* Insert a node at a given position.
*
* @param n Node to be added
* @param pos Offset at which the node is to be inserted,
* with 0 being the first position.
* @throws RuntimeException thrown if this NodeSetDTM is not of
* a mutable type.
*/
public void insertNode(int n, int pos)
{
if (!m_mutable)
throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");
insertElementAt(n, pos);
}
/**
* Remove a node.
*
* @param n Node to be added
* @throws RuntimeException thrown if this NodeSetDTM is not of
* a mutable type.
*/
public void removeNode(int n)
{
if (!m_mutable)
throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");
this.removeElement(n);
}
// %TBD%
// /**
// * Copy NodeList members into this nodelist, adding in
// * document order. If a node is null, don't add it.
// *
// * @param nodelist List of nodes which should now be referenced by
// * this NodeSetDTM.
// * @throws RuntimeException thrown if this NodeSetDTM is not of
// * a mutable type.
// */
// public void addNodes(NodeList nodelist)
// {
//
// if (!m_mutable)
// throw new RuntimeException("This NodeSetDTM is not mutable!");
//
// if (null != nodelist) // defensive to fix a bug that Sanjiva reported.
// {
// int nChildren = nodelist.getLength();
//
// for (int i = 0; i < nChildren; i++)
// {
// int obj = nodelist.item(i);
//
// if (null != obj)
// {
// addElement(obj);
// }
// }
// }
//
// // checkDups();
// }
// %TBD%
// /**
// * <p>Copy NodeList members into this nodelist, adding in
// * document order. Only genuine node references will be copied;
// * nulls appearing in the source NodeSetDTM will
// * not be added to this one. </p>
// *
// * <p> In case you're wondering why this function is needed: NodeSetDTM
// * implements both DTMIterator and NodeList. If this method isn't
// * provided, Java can't decide which of those to use when addNodes()
// * is invoked. Providing the more-explicit match avoids that
// * ambiguity.)</p>
// *
// * @param ns NodeSetDTM whose members should be merged into this NodeSetDTM.
// * @throws RuntimeException thrown if this NodeSetDTM is not of
// * a mutable type.
// */
// public void addNodes(NodeSetDTM ns)
// {
//
// if (!m_mutable)
// throw new RuntimeException("This NodeSetDTM is not mutable!");
//
// addNodes((DTMIterator) ns);
// }
/**
* Copy NodeList members into this nodelist, adding in
* document order. Null references are not added.
*
* @param iterator DTMIterator which yields the nodes to be added.
* @throws RuntimeException thrown if this NodeSetDTM is not of
* a mutable type.
*/
public void addNodes(DTMIterator iterator)
{
if (!m_mutable)
throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");
if (null != iterator) // defensive to fix a bug that Sanjiva reported.
{
int obj;
while (DTM.NULL != (obj = iterator.nextNode()))
{
addElement(obj);
}
}
// checkDups();
}
// %TBD%
// /**
// * Copy NodeList members into this nodelist, adding in
// * document order. If a node is null, don't add it.
// *
// * @param nodelist List of nodes to be added
// * @param support The XPath runtime context.
// * @throws RuntimeException thrown if this NodeSetDTM is not of
// * a mutable type.
// */
// public void addNodesInDocOrder(NodeList nodelist, XPathContext support)
// {
//
// if (!m_mutable)
// throw new RuntimeException("This NodeSetDTM is not mutable!");
//
// int nChildren = nodelist.getLength();
//
// for (int i = 0; i < nChildren; i++)
// {
// int node = nodelist.item(i);
//
// if (null != node)
// {
// addNodeInDocOrder(node, support);
// }
// }
// }
/**
* Copy NodeList members into this nodelist, adding in
* document order. If a node is null, don't add it.
*
* @param iterator DTMIterator which yields the nodes to be added.
* @param support The XPath runtime context.
* @throws RuntimeException thrown if this NodeSetDTM is not of
* a mutable type.
*/
public void addNodesInDocOrder(DTMIterator iterator, XPathContext support)
{
if (!m_mutable)
throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");
int node;
while (DTM.NULL != (node = iterator.nextNode()))
{
addNodeInDocOrder(node, support);
}
}
// %TBD%
// /**
// * Add the node list to this node set in document order.
// *
// * @param start index.
// * @param end index.
// * @param testIndex index.
// * @param nodelist The nodelist to add.
// * @param support The XPath runtime context.
// *
// * @return false always.
// * @throws RuntimeException thrown if this NodeSetDTM is not of
// * a mutable type.
// */
// private boolean addNodesInDocOrder(int start, int end, int testIndex,
// NodeList nodelist, XPathContext support)
// {
//
// if (!m_mutable)
// throw new RuntimeException("This NodeSetDTM is not mutable!");
//
// boolean foundit = false;
// int i;
// int node = nodelist.item(testIndex);
//
// for (i = end; i >= start; i--)
// {
// int child = elementAt(i);
//
// if (child == node)
// {
// i = -2; // Duplicate, suppress insert
//
// break;
// }
//
// if (!support.getDOMHelper().isNodeAfter(node, child))
// {
// insertElementAt(node, i + 1);
//
// testIndex--;
//
// if (testIndex > 0)
// {
// boolean foundPrev = addNodesInDocOrder(0, i, testIndex, nodelist,
// support);
//
// if (!foundPrev)
// {
// addNodesInDocOrder(i, size() - 1, testIndex, nodelist, support);
// }
// }
//
// break;
// }
// }
//
// if (i == -1)
// {
// insertElementAt(node, 0);
// }
//
// return foundit;
// }
/**
* Add the node into a vector of nodes where it should occur in
* document order.
* @param node The node to be added.
* @param test true if we should test for doc order
* @param support The XPath runtime context.
* @return insertIndex.
* @throws RuntimeException thrown if this NodeSetDTM is not of
* a mutable type.
*/
public int addNodeInDocOrder(int node, boolean test, XPathContext support)
{
if (!m_mutable)
throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");
int insertIndex = -1;
if (test)
{
// This needs to do a binary search, but a binary search
// is somewhat tough because the sequence test involves
// two nodes.
int size = size(), i;
for (i = size - 1; i >= 0; i--)
{
int child = elementAt(i);
if (child == node)
{
i = -2; // Duplicate, suppress insert
break;
}
DTM dtm = support.getDTM(node);
if (!dtm.isNodeAfter(node, child))
{
break;
}
}
if (i != -2)
{
insertIndex = i + 1;
insertElementAt(node, insertIndex);
}
}
else
{
insertIndex = this.size();
boolean foundit = false;
for (int i = 0; i < insertIndex; i++)
{
if (i == node)
{
foundit = true;
break;
}
}
if (!foundit)
addElement(node);
}
// checkDups();
return insertIndex;
} // end addNodeInDocOrder(Vector v, Object obj)
/**
* Add the node into a vector of nodes where it should occur in
* document order.
* @param node The node to be added.
* @param support The XPath runtime context.
*
* @return The index where it was inserted.
* @throws RuntimeException thrown if this NodeSetDTM is not of
* a mutable type.
*/
public int addNodeInDocOrder(int node, XPathContext support)
{
if (!m_mutable)
throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");
return addNodeInDocOrder(node, true, support);
} // end addNodeInDocOrder(Vector v, Object obj)
/**
* Get the length of the list.
*
* @return The size of this node set.
*/
public int size()
{
return super.size();
}
/**
* Append a Node onto the vector.
*
* @param value The node to be added.
* @throws RuntimeException thrown if this NodeSetDTM is not of
* a mutable type.
*/
public void addElement(int value)
{
if (!m_mutable)
throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");
super.addElement(value);
}
/**
* Inserts the specified node in this vector at the specified index.
* Each component in this vector with an index greater or equal to
* the specified index is shifted upward to have an index one greater
* than the value it had previously.
*
* @param value The node to be inserted.
* @param at The index where the insert should occur.
* @throws RuntimeException thrown if this NodeSetDTM is not of
* a mutable type.
*/
public void insertElementAt(int value, int at)
{
if (!m_mutable)
throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");
super.insertElementAt(value, at);
}
/**
* Append the nodes to the list.
*
* @param nodes The nodes to be appended to this node set.
* @throws RuntimeException thrown if this NodeSetDTM is not of
* a mutable type.
*/
public void appendNodes(NodeVector nodes)
{
if (!m_mutable)
throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");
super.appendNodes(nodes);
}
/**
* Inserts the specified node in this vector at the specified index.
* Each component in this vector with an index greater or equal to
* the specified index is shifted upward to have an index one greater
* than the value it had previously.
* @throws RuntimeException thrown if this NodeSetDTM is not of
* a mutable type.
*/
public void removeAllElements()
{
if (!m_mutable)
throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");
super.removeAllElements();
}
/**
* Removes the first occurrence of the argument from this vector.
* If the object is found in this vector, each component in the vector
* with an index greater or equal to the object's index is shifted
* downward to have an index one smaller than the value it had
* previously.
*
* @param s The node to be removed.
*
* @return True if the node was successfully removed
* @throws RuntimeException thrown if this NodeSetDTM is not of
* a mutable type.
*/
public boolean removeElement(int s)
{
if (!m_mutable)
throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");
return super.removeElement(s);
}
/**
* Deletes the component at the specified index. Each component in
* this vector with an index greater or equal to the specified
* index is shifted downward to have an index one smaller than
* the value it had previously.
*
* @param i The index of the node to be removed.
* @throws RuntimeException thrown if this NodeSetDTM is not of
* a mutable type.
*/
public void removeElementAt(int i)
{
if (!m_mutable)
throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");
super.removeElementAt(i);
}
/**
* Sets the component at the specified index of this vector to be the
* specified object. The previous component at that position is discarded.
*
* The index must be a value greater than or equal to 0 and less
* than the current size of the vector.
*
* @param node The node to be set.
* @param index The index of the node to be replaced.
* @throws RuntimeException thrown if this NodeSetDTM is not of
* a mutable type.
*/
public void setElementAt(int node, int index)
{
if (!m_mutable)
throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");
super.setElementAt(node, index);
}
/**
* Same as setElementAt.
*
* @param node The node to be set.
* @param index The index of the node to be replaced.
* @throws RuntimeException thrown if this NodeSetDTM is not of
* a mutable type.
*/
public void setItem(int node, int index)
{
if (!m_mutable)
throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_NOT_MUTABLE, null)); //"This NodeSetDTM is not mutable!");
super.setElementAt(node, index);
}
/**
* Get the nth element.
*
* @param i The index of the requested node.
*
* @return Node at specified index.
*/
public int elementAt(int i)
{
runTo(i);
return super.elementAt(i);
}
/**
* Tell if the table contains the given node.
*
* @param s Node to look for
*
* @return True if the given node was found.
*/
public boolean contains(int s)
{
runTo(-1);
return super.contains(s);
}
/**
* Searches for the first occurence of the given argument,
* beginning the search at index, and testing for equality
* using the equals method.
*
* @param elem Node to look for
* @param index Index of where to start the search
* @return the index of the first occurrence of the object
* argument in this vector at position index or later in the
* vector; returns -1 if the object is not found.
*/
public int indexOf(int elem, int index)
{
runTo(-1);
return super.indexOf(elem, index);
}
/**
* Searches for the first occurence of the given argument,
* beginning the search at index, and testing for equality
* using the equals method.
*
* @param elem Node to look for
* @return the index of the first occurrence of the object
* argument in this vector at position index or later in the
* vector; returns -1 if the object is not found.
*/
public int indexOf(int elem)
{
runTo(-1);
return super.indexOf(elem);
}
/** If this node is being used as an iterator, the next index that nextNode()
* will return. */
transient protected int m_next = 0;
/**
* Get the current position, which is one less than
* the next nextNode() call will retrieve. i.e. if
* you call getCurrentPos() and the return is 0, the next
* fetch will take place at index 1.
*
* @return The the current position index.
*/
public int getCurrentPos()
{
return m_next;
}
/**
* Set the current position in the node set.
* @param i Must be a valid index.
* @throws RuntimeException thrown if this NodeSetDTM is not of
* a cached type, and thus doesn't permit indexed access.
*/
public void setCurrentPos(int i)
{
if (!m_cacheNodes)
throw new RuntimeException(
XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NODESETDTM_CANNOT_INDEX, null)); //"This NodeSetDTM can not do indexing or counting functions!");
m_next = i;
}
/**
* Return the last fetched node. Needed to support the UnionPathIterator.
*
* @return the last fetched node.
* @throws RuntimeException thrown if this NodeSetDTM is not of
* a cached type, and thus doesn't permit indexed access.
*/
public int getCurrentNode()
{
if (!m_cacheNodes)
throw new RuntimeException(
"This NodeSetDTM can not do indexing or counting functions!");
int saved = m_next;
// because nextNode always increments
// But watch out for copy29, where the root iterator didn't
// have nextNode called on it.
int current = (m_next > 0) ? m_next-1 : m_next;
int n = (current < m_firstFree) ? elementAt(current) : DTM.NULL;
m_next = saved; // HACK: I think this is a bit of a hack. -sb
return n;
}
/** True if this list can be mutated. */
transient protected boolean m_mutable = true;
/** True if this list is cached.
* @serial */
transient protected boolean m_cacheNodes = true;
/** The root of the iteration, if available. */
protected int m_root = DTM.NULL;
/**
* Get whether or not this is a cached node set.
*
*
* @return True if this list is cached.
*/
public boolean getShouldCacheNodes()
{
return m_cacheNodes;
}
/**
* If setShouldCacheNodes(true) is called, then nodes will
* be cached. They are not cached by default. This switch must
* be set before the first call to nextNode is made, to ensure
* that all nodes are cached.
*
* @param b true if this node set should be cached.
* @throws RuntimeException thrown if an attempt is made to
* request caching after we've already begun stepping through the
* nodes in this set.
*/
public void setShouldCacheNodes(boolean b)
{
if (!isFresh())
throw new RuntimeException(
XSLMessages.createXPATHMessage(XPATHErrorResources.ER_CANNOT_CALL_SETSHOULDCACHENODE, null)); //"Can not call setShouldCacheNodes after nextNode has been called!");
m_cacheNodes = b;
m_mutable = true;
}
/**
* Tells if this iterator can have nodes added to it or set via
* the <code>setItem(int node, int index) method.
*
* @return True if the nodelist can be mutated.
*/
public boolean isMutable()
{
return m_mutable;
}
transient private int m_last = 0;
public int getLast()
{
return m_last;
}
public void setLast(int last)
{
m_last = last;
}
/**
* Returns true if all the nodes in the iteration well be returned in document
* order.
*
* @return true as a default.
*/
public boolean isDocOrdered()
{
return true;
}
/**
* Returns the axis being iterated, if it is known.
*
* @return Axis.CHILD, etc., or -1 if the axis is not known or is of multiple
* types.
*/
public int getAxis()
{
return -1;
}
}
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