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/*
* $Id: NodeIteratorBase.java,v 1.10 2010-11-01 04:34:24 joehw Exp $
*/
package com.sun.org.apache.xalan.internal.xsltc.dom;
import com.sun.org.apache.xalan.internal.xsltc.NodeIterator;
import com.sun.org.apache.xalan.internal.xsltc.runtime.BasisLibrary;
/**
* @author Jacek Ambroziak
* @author Santiago Pericas-Geertsen
* @author Morten Jorgensen
*/
public abstract class NodeIteratorBase implements NodeIterator {
/**
* Cached computed value of last().
*/
protected int _last = -1;
/**
* Value of position() in this iterator. Incremented in
* returnNode().
*/
protected int _position = 0;
/**
* Store node in call to setMark().
*/
protected int _markedNode;
/**
* Store node in call to setStartNode().
*/
protected int _startNode = NodeIterator.END;
/**
* Flag indicating if "self" should be returned.
*/
protected boolean _includeSelf = false;
/**
* Flag indicating if iterator can be restarted.
*/
protected boolean _isRestartable = true;
/**
* Setter for _isRestartable flag.
*/
public void setRestartable(boolean isRestartable) {
_isRestartable = isRestartable;
}
/**
* Initialize iterator using a node. If iterator is not
* restartable, then do nothing. If node is equal to END then
* subsequent calls to next() must return END.
*/
abstract public NodeIterator setStartNode(int node);
/**
* Reset this iterator using state from last call to
* setStartNode().
*/
public NodeIterator reset() {
final boolean temp = _isRestartable;
_isRestartable = true;
// Must adjust _startNode if self is included
setStartNode(_includeSelf ? _startNode + 1 : _startNode);
_isRestartable = temp;
return this;
}
/**
* Setter for _includeSelf flag.
*/
public NodeIterator includeSelf() {
_includeSelf = true;
return this;
}
/**
* Default implementation of getLast(). Stores current position
* and current node, resets the iterator, counts all nodes and
* restores iterator to original state.
*/
public int getLast() {
if (_last == -1) {
final int temp = _position;
setMark();
reset();
do {
_last++;
} while (next() != END);
gotoMark();
_position = temp;
}
return _last;
}
/**
* Returns the position() in this iterator.
*/
public int getPosition() {
return _position == 0 ? 1 : _position;
}
/**
* Indicates if position in this iterator is computed in reverse
* document order. Note that nodes are always returned in document
* order.
*/
public boolean isReverse() {
return false;
}
/**
* Clones and resets this iterator. Note that the cloned iterator is
* not restartable. This is because cloning is needed for variable
* references, and the context node of the original variable
* declaration must be preserved.
*/
public NodeIterator cloneIterator() {
try {
final NodeIteratorBase clone = (NodeIteratorBase)super.clone();
clone._isRestartable = false;
return clone.reset();
}
catch (CloneNotSupportedException e) {
BasisLibrary.runTimeError(BasisLibrary.ITERATOR_CLONE_ERR,
e.toString());
return null;
}
}
/**
* Utility method that increments position and returns its
* argument.
*/
protected final int returnNode(final int node) {
_position++;
return node;
}
/**
* Reset the position in this iterator.
*/
protected final NodeIterator resetPosition() {
_position = 0;
return this;
}
}