diff options
Diffstat (limited to 'src/com/sun/org/apache/xalan/internal/xsltc/dom/KeyIndex.java')
| -rw-r--r-- | src/com/sun/org/apache/xalan/internal/xsltc/dom/KeyIndex.java | 900 |
1 files changed, 0 insertions, 900 deletions
diff --git a/src/com/sun/org/apache/xalan/internal/xsltc/dom/KeyIndex.java b/src/com/sun/org/apache/xalan/internal/xsltc/dom/KeyIndex.java deleted file mode 100644 index 5eb17d7..0000000 --- a/src/com/sun/org/apache/xalan/internal/xsltc/dom/KeyIndex.java +++ /dev/null @@ -1,900 +0,0 @@ -/* - * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved. - */ -/* - * Licensed to the Apache Software Foundation (ASF) under one or more - * contributor license agreements. See the NOTICE file distributed with - * this work for additional information regarding copyright ownership. - * The ASF licenses this file to You 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: KeyIndex.java,v 1.6 2006/06/19 19:49:02 spericas Exp $ - */ - -package com.sun.org.apache.xalan.internal.xsltc.dom; - -import com.sun.org.apache.xalan.internal.xsltc.DOM; -import com.sun.org.apache.xalan.internal.xsltc.DOMEnhancedForDTM; -import com.sun.org.apache.xalan.internal.xsltc.runtime.BasisLibrary; -import com.sun.org.apache.xalan.internal.xsltc.util.IntegerArray; -import com.sun.org.apache.xml.internal.dtm.Axis; -import com.sun.org.apache.xml.internal.dtm.DTM; -import com.sun.org.apache.xml.internal.dtm.DTMAxisIterator; -import com.sun.org.apache.xml.internal.dtm.ref.DTMAxisIteratorBase; -import java.util.HashMap; -import java.util.Map; -import java.util.StringTokenizer; - -/** - * Stores mappings of key values or IDs to DTM nodes. - * <em>Use of an instance of this class as a {@link DTMAxisIterator} is - * <b>deprecated.</b></em> - * @author Morten Jorgensen - * @author Santiago Pericas-Geertsen - */ -public class KeyIndex extends DTMAxisIteratorBase { - - /** - * A mapping between values and nodesets for the current document. Used - * only while building keys. - */ - private Map<String, IntegerArray> _index; - - /** - * The document node currently being processed. Used only while building - * keys. - */ - private int _currentDocumentNode = DTM.NULL; - - /** - * A mapping from a document node to the mapping between values and nodesets - */ - private Map<Integer, Map> _rootToIndexMap = new HashMap<>(); - - /** - * The node set associated to the current value passed - * to lookupKey(); - */ - private IntegerArray _nodes = null; - - /** - * The XSLTC DOM object if this KeyIndex is being used to implement the - * id() function. - */ - private DOM _dom; - - private DOMEnhancedForDTM _enhancedDOM; - - /** - * Store position after call to setMark() - */ - private int _markedPosition = 0; - - public KeyIndex(int dummy) { - } - - public void setRestartable(boolean flag) { - } - - /** - * Adds a node to the node list for a given value. Nodes will - * always be added in document order. - */ - public void add(String value, int node, int rootNode) { - if (_currentDocumentNode != rootNode) { - _currentDocumentNode = rootNode; - _index = new HashMap<>(); - _rootToIndexMap.put(rootNode, _index); - } - - IntegerArray nodes = _index.get(value); - - if (nodes == null) { - nodes = new IntegerArray(); - _index.put(value, nodes); - nodes.add(node); - - // Because nodes are added in document order, - // duplicates can be eliminated easily at this stage. - } else if (node != nodes.at(nodes.cardinality() - 1)) { - nodes.add(node); - } - } - - /** - * Merge the current value's nodeset set by lookupKey() with _nodes. - * @deprecated - */ - public void merge(KeyIndex other) { - if (other == null) return; - - if (other._nodes != null) { - if (_nodes == null) { - _nodes = (IntegerArray)other._nodes.clone(); - } - else { - _nodes.merge(other._nodes); - } - } - } - - /** - * This method must be called by the code generated by the id() function - * prior to returning the node iterator. The lookup code for key() and - * id() differ in the way the lookup value can be whitespace separated - * list of tokens for the id() function, but a single string for the - * key() function. - * @deprecated - */ - public void lookupId(Object value) { - // Clear _nodes array - _nodes = null; - - final StringTokenizer values = new StringTokenizer((String) value, - " \n\t"); - while (values.hasMoreElements()) { - final String token = (String) values.nextElement(); - IntegerArray nodes = _index.get(token); - - if (nodes == null && _enhancedDOM != null - && _enhancedDOM.hasDOMSource()) { - nodes = getDOMNodeById(token); - } - - if (nodes == null) continue; - - if (_nodes == null) { - nodes = (IntegerArray)nodes.clone(); - _nodes = nodes; - } - else { - _nodes.merge(nodes); - } - } - } - - /** - * Return an IntegerArray for the DOM Node which has the given id. - * - * @param id The id - * @return A IntegerArray representing the Node whose id is the given value. - */ - public IntegerArray getDOMNodeById(String id) { - IntegerArray nodes = null; - - if (_enhancedDOM != null) { - int ident = _enhancedDOM.getElementById(id); - - if (ident != DTM.NULL) { - Integer root = new Integer(_enhancedDOM.getDocument()); - Map<String, IntegerArray> index = _rootToIndexMap.get(root); - - if (index == null) { - index = new HashMap<>(); - _rootToIndexMap.put(root, index); - } else { - nodes = index.get(id); - } - - if (nodes == null) { - nodes = new IntegerArray(); - index.put(id, nodes); - } - - nodes.add(_enhancedDOM.getNodeHandle(ident)); - } - } - - return nodes; - } - - /** - * <p>This method must be called by the code generated by the key() function - * prior to returning the node iterator.</p> - * <p><em>Use of an instance of this class as a {@link DTMAxisIterator} is - * <b>deprecated.</b></em></p> - * @deprecated - */ - public void lookupKey(Object value) { - IntegerArray nodes = _index.get(value); - _nodes = (nodes != null) ? (IntegerArray) nodes.clone() : null; - _position = 0; - } - - /** - * <p>Callers should not call next() after it returns END.</p> - * <p><em>Use of an instance of this class as a {@link DTMAxisIterator} is - * <b>deprecated.</b></em></p> - * @deprecated - */ - public int next() { - if (_nodes == null) return DTMAxisIterator.END; - - return (_position < _nodes.cardinality()) ? - _dom.getNodeHandle(_nodes.at(_position++)) : DTMAxisIterator.END; - } - - /** - * Given a context node and the argument to the XPath <code>id</code> - * function, checks whether the context node is in the set of nodes that - * results from that reference to the <code>id</code> function. This is - * used in the implementation of <code>id</code> patterns. - * - * @param node The context node - * @param value The argument to the <code>id</code> function - * @return <code>1</code> if the context node is in the set of nodes - * returned by the reference to the <code>id</code> function; - * <code>0</code>, otherwise - */ - public int containsID(int node, Object value) { - final String string = (String)value; - int rootHandle = _dom.getAxisIterator(Axis.ROOT) - .setStartNode(node).next(); - - // Get the mapping table for the document containing the context node - Map<String, IntegerArray> index = - _rootToIndexMap.get(rootHandle); - - // Split argument to id function into XML whitespace separated tokens - final StringTokenizer values = new StringTokenizer(string, " \n\t"); - - while (values.hasMoreElements()) { - final String token = (String) values.nextElement(); - IntegerArray nodes = null; - - if (index != null) { - nodes = index.get(token); - } - - // If input was from W3C DOM, use DOM's getElementById to do - // the look-up. - if (nodes == null && _enhancedDOM != null - && _enhancedDOM.hasDOMSource()) { - nodes = getDOMNodeById(token); - } - - // Did we find the context node in the set of nodes? - if (nodes != null && nodes.indexOf(node) >= 0) { - return 1; - } - } - - // Didn't find the context node in the set of nodes returned by id - return 0; - } - - /** - * <p>Given a context node and the second argument to the XSLT - * <code>key</code> function, checks whether the context node is in the - * set of nodes that results from that reference to the <code>key</code> - * function. This is used in the implementation of key patterns.</p> - * <p>This particular {@link KeyIndex} object is the result evaluating the - * first argument to the <code>key</code> function, so it's not taken into - * any further account.</p> - * - * @param node The context node - * @param value The second argument to the <code>key</code> function - * @return <code>1</code> if and only if the context node is in the set of - * nodes returned by the reference to the <code>key</code> function; - * <code>0</code>, otherwise - */ - public int containsKey(int node, Object value) { - int rootHandle = _dom.getAxisIterator(Axis.ROOT) - .setStartNode(node).next(); - - // Get the mapping table for the document containing the context node - Map<String,IntegerArray> index = - _rootToIndexMap.get(new Integer(rootHandle)); - - // Check whether the context node is present in the set of nodes - // returned by the key function - if (index != null) { - final IntegerArray nodes = index.get(value); - return (nodes != null && nodes.indexOf(node) >= 0) ? 1 : 0; - } - - // The particular key name identifies no nodes in this document - return 0; - } - - /** - * <p>Resets the iterator to the last start node.</p> - * <p><em>Use of an instance of this class as a {@link DTMAxisIterator} is - * <b>deprecated.</b></em></p> - * @deprecated - */ - public DTMAxisIterator reset() { - _position = 0; - return this; - } - - /** - * <p>Returns the number of elements in this iterator.</p> - * <p><em>Use of an instance of this class as a {@link DTMAxisIterator} is - * <b>deprecated.</b></em></p> - * @deprecated - */ - public int getLast() { - return (_nodes == null) ? 0 : _nodes.cardinality(); - } - - /** - * <p>Returns the position of the current node in the set.</p> - * <p><em>Use of an instance of this class as a {@link DTMAxisIterator} is - * <b>deprecated.</b></em></p> - * @deprecated - */ - public int getPosition() { - return _position; - } - - /** - * <p>Remembers the current node for the next call to gotoMark().</p> - * <p><em>Use of an instance of this class as a {@link DTMAxisIterator} is - * <b>deprecated.</b></em></p> - * @deprecated - */ - public void setMark() { - _markedPosition = _position; - } - - /** - * <p>Restores the current node remembered by setMark().</p> - * <p><em>Use of an instance of this class as a {@link DTMAxisIterator} is - * <b>deprecated.</b></em></p> - * @deprecated - */ - public void gotoMark() { - _position = _markedPosition; - } - - /** - * <p>Set start to END should 'close' the iterator, - * i.e. subsequent call to next() should return END.</p> - * <p><em>Use of an instance of this class as a {@link DTMAxisIterator} is - * <b>deprecated.</b></em></p> - * @deprecated - */ - public DTMAxisIterator setStartNode(int start) { - if (start == DTMAxisIterator.END) { - _nodes = null; - } - else if (_nodes != null) { - _position = 0; - } - return (DTMAxisIterator) this; - } - - /** - * <p>Get start to END should 'close' the iterator, - * i.e. subsequent call to next() should return END.</p> - * <p><em>Use of an instance of this class as a {@link DTMAxisIterator} is - * <b>deprecated.</b></em></p> - * @deprecated - */ - public int getStartNode() { - return 0; - } - - /** - * <p>True if this iterator has a reversed axis.</p> - * <p><em>Use of an instance of this class as a {@link DTMAxisIterator} is - * <b>deprecated.</b></em></p> - * @deprecated - */ - public boolean isReverse() { - return(false); - } - - /** - * <p>Returns a deep copy of this iterator.</p> - * <p><em>Use of an instance of this class as a {@link DTMAxisIterator} is - * <b>deprecated.</b></em></p> - * @deprecated - */ - public DTMAxisIterator cloneIterator() { - KeyIndex other = new KeyIndex(0); - other._index = _index; - other._rootToIndexMap = _rootToIndexMap; - other._nodes = _nodes; - other._position = _position; - return (DTMAxisIterator) other; - } - - public void setDom(DOM dom, int node) { - _dom = dom; - - // If a MultiDOM, ensure _enhancedDOM is correctly set - // so that getElementById() works in lookupNodes below - if (dom instanceof MultiDOM) { - dom = ((MultiDOM) dom).getDTM(node); - } - - if (dom instanceof DOMEnhancedForDTM) { - _enhancedDOM = (DOMEnhancedForDTM)dom; - } - else if (dom instanceof DOMAdapter) { - DOM idom = ((DOMAdapter)dom).getDOMImpl(); - if (idom instanceof DOMEnhancedForDTM) { - _enhancedDOM = (DOMEnhancedForDTM)idom; - } - } - } - - /** - * Create a {@link KeyIndexIterator} that iterates over the nodes that - * result from a reference to the XSLT <code>key</code> function or - * XPath <code>id</code> function. - * - * @param keyValue A string or iterator representing the key values or id - * references - * @param isKeyCall A <code>boolean</code> indicating whether the iterator - * is being created for a reference <code>key</code> or - * <code>id</code> - */ - public KeyIndexIterator getKeyIndexIterator(Object keyValue, - boolean isKeyCall) { - if (keyValue instanceof DTMAxisIterator) { - return getKeyIndexIterator((DTMAxisIterator) keyValue, isKeyCall); - } else { - return getKeyIndexIterator(BasisLibrary.stringF(keyValue, _dom), - isKeyCall); - } - } - - /** - * Create a {@link KeyIndexIterator} that iterates over the nodes that - * result from a reference to the XSLT <code>key</code> function or - * XPath <code>id</code> function. - * - * @param keyValue A string representing the key values or id - * references - * @param isKeyCall A <code>boolean</code> indicating whether the iterator - * is being created for a reference <code>key</code> or - * <code>id</code> - */ - public KeyIndexIterator getKeyIndexIterator(String keyValue, - boolean isKeyCall) { - return new KeyIndexIterator(keyValue, isKeyCall); - } - - /** - * Create a {@link KeyIndexIterator} that iterates over the nodes that - * result from a reference to the XSLT <code>key</code> function or - * XPath <code>id</code> function. - * - * @param keyValue An iterator representing the key values or id - * references - * @param isKeyCall A <code>boolean</code> indicating whether the iterator - * is being created for a reference <code>key</code> or - * <code>id</code> - */ - public KeyIndexIterator getKeyIndexIterator(DTMAxisIterator keyValue, - boolean isKeyCall) { - return new KeyIndexIterator(keyValue, isKeyCall); - } - - /** - * Used to represent an empty node set. - */ - final private static IntegerArray EMPTY_NODES = new IntegerArray(0); - - - /** - * An iterator representing the result of a reference to either the - * XSLT <code>key</code> function or the XPath <code>id</code> function. - */ - public class KeyIndexIterator extends MultiValuedNodeHeapIterator { - - /** - * <p>A reference to the <code>key</code> function that only has one - * key value or to the <code>id</code> function that has only one string - * argument can be optimized to ignore the multi-valued heap. This - * field will be <code>null</code> otherwise. - */ - private IntegerArray _nodes; - - /** - * <p>This field contains the iterator representing a node set key value - * argument to the <code>key</code> function or a node set argument - * to the <code>id</code> function.</p> - * - * <p>Exactly one of this field and {@link #_keyValue} must be - * <code>null</code>.</p> - */ - private DTMAxisIterator _keyValueIterator; - - /** - * <p>This field contains the iterator representing a non-node-set key - * value argument to the <code>key</code> function or a non-node-set - * argument to the <code>id</code> function.</p> - * - * <p>Exactly one of this field and {@link #_keyValueIterator} must be - * <code>null</code>.</p> - */ - private String _keyValue; - - /** - * Indicates whether this object represents the result of a reference - * to the <code>key</code> function (<code>true</code>) or the - * <code>id</code> function (<code>false</code>). - */ - private boolean _isKeyIterator; - - /** - * Represents the DTM nodes retrieved for one key value or one string - * argument to <code>id</code> for use as one heap node in a - * {@link MultiValuedNodeHeapIterator}. - */ - protected class KeyIndexHeapNode - extends MultiValuedNodeHeapIterator.HeapNode - { - /** - * {@link IntegerArray} of DTM nodes retrieved for one key value. - * Must contain no duplicates and be stored in document order. - */ - private IntegerArray _nodes; - - /** - * Position in {@link #_nodes} array of next node to return from - * this heap node. - */ - private int _position = 0; - - /** - * Marked position. Used by {@link #setMark()} and - * {@link #gotoMark()} - */ - private int _markPosition = -1; - - /** - * Create a heap node representing DTM nodes retrieved for one - * key value in a reference to the <code>key</code> function - * or string argument to the <code>id</code> function. - */ - KeyIndexHeapNode(IntegerArray nodes) { - _nodes = nodes; - } - - /** - * Advance to the next node represented by this {@link HeapNode} - * - * @return the next DTM node. - */ - public int step() { - if (_position < _nodes.cardinality()) { - _node = _nodes.at(_position); - _position++; - } else { - _node = DTMAxisIterator.END; - } - - return _node; - } - - /** - * Creates a deep copy of this {@link HeapNode}. The clone is not - * reset from the current position of the original. - * - * @return the cloned heap node - */ - public HeapNode cloneHeapNode() { - KeyIndexHeapNode clone = - (KeyIndexHeapNode) super.cloneHeapNode(); - - clone._nodes = _nodes; - clone._position = _position; - clone._markPosition = _markPosition; - - return clone; - } - - /** - * Remembers the current node for the next call to - * {@link #gotoMark()}. - */ - public void setMark() { - _markPosition = _position; - } - - /** - * Restores the current node remembered by {@link #setMark()}. - */ - public void gotoMark() { - _position = _markPosition; - } - - /** - * Performs a comparison of the two heap nodes - * - * @param heapNode the heap node against which to compare - * @return <code>true</code> if and only if the current node for - * this heap node is before the current node of the - * argument heap node in document order. - */ - public boolean isLessThan(HeapNode heapNode) { - return _node < heapNode._node; - } - - /** - * <p>Sets context with respect to which this heap node is - * evaluated.</p> - * <p>This has no real effect on this kind of heap node. Instead, - * the {@link KeyIndexIterator#setStartNode(int)} method should - * create new instances of this class to represent the effect of - * changing the context.</p> - */ - public HeapNode setStartNode(int node) { - return this; - } - - /** - * Reset the heap node back to its beginning. - */ - public HeapNode reset() { - _position = 0; - return this; - } - } - - /** - * Constructor used when the argument to <code>key</code> or - * <code>id</code> is not a node set. - * - * @param keyValue the argument to <code>key</code> or <code>id</code> - * cast to a <code>String</code> - * @param isKeyIterator indicates whether the constructed iterator - * represents a reference to <code>key</code> or - * <code>id</code>. - */ - KeyIndexIterator(String keyValue, boolean isKeyIterator) { - _isKeyIterator = isKeyIterator; - _keyValue = keyValue; - } - - /** - * Constructor used when the argument to <code>key</code> or - * <code>id</code> is a node set. - * - * @param keyValues the argument to <code>key</code> or <code>id</code> - * @param isKeyIterator indicates whether the constructed iterator - * represents a reference to <code>key</code> or - * <code>id</code>. - */ - KeyIndexIterator(DTMAxisIterator keyValues, boolean isKeyIterator) { - _keyValueIterator = keyValues; - _isKeyIterator = isKeyIterator; - } - - /** - * Retrieve nodes for a particular key value or a particular id - * argument value. - * - * @param root The root node of the document containing the context node - * @param keyValue The key value of id string argument value - * @return an {@link IntegerArray} of the resulting nodes - */ - protected IntegerArray lookupNodes(int root, String keyValue) { - IntegerArray result = null; - - // Get mapping from key values/IDs to DTM nodes for this document - Map<String, IntegerArray> index = _rootToIndexMap.get(root); - - if (!_isKeyIterator) { - // For id function, tokenize argument as whitespace separated - // list of values and look up nodes identified by each ID. - final StringTokenizer values = - new StringTokenizer(keyValue, " \n\t"); - - while (values.hasMoreElements()) { - final String token = (String) values.nextElement(); - IntegerArray nodes = null; - - // Does the ID map to any node in the document? - if (index != null) { - nodes = index.get(token); - } - - // If input was from W3C DOM, use DOM's getElementById to do - // the look-up. - if (nodes == null && _enhancedDOM != null - && _enhancedDOM.hasDOMSource()) { - nodes = getDOMNodeById(token); - } - - // If we found any nodes, merge them into the cumulative - // result - if (nodes != null) { - if (result == null) { - result = (IntegerArray)nodes.clone(); - } else { - result.merge(nodes); - } - } - } - } else if (index != null) { - // For key function, map key value to nodes - result = index.get(keyValue); - } - - return result; - } - - /** - * Set context node for the iterator. This will cause the iterator - * to reset itself, reevaluate arguments to the function, look up - * nodes in the input and reinitialize its internal heap. - * - * @param node the context node - * @return A {@link DTMAxisIterator} set to the start of the iteration. - */ - public DTMAxisIterator setStartNode(int node) { - _startNode = node; - - // If the arugment to the function is a node set, set the - // context node on it. - if (_keyValueIterator != null) { - _keyValueIterator = _keyValueIterator.setStartNode(node); - } - - init(); - - return super.setStartNode(node); - } - - /** - * Get the next node in the iteration. - * - * @return The next node handle in the iteration, or END. - */ - public int next() { - int nodeHandle; - - // If at most one key value or at most one string argument to id - // resulted in nodes being returned, use the IntegerArray - // stored at _nodes directly. This relies on the fact that the - // IntegerArray never includes duplicate nodes and is always stored - // in document order. - if (_nodes != null) { - if (_position < _nodes.cardinality()) { - nodeHandle = returnNode(_nodes.at(_position)); - } else { - nodeHandle = DTMAxisIterator.END; - } - } else { - nodeHandle = super.next(); - } - - return nodeHandle; - } - - /** - * Resets the iterator to the last start node. - * - * @return A DTMAxisIterator, which may or may not be the same as this - * iterator. - */ - public DTMAxisIterator reset() { - if (_nodes == null) { - init(); - } else { - super.reset(); - } - - return resetPosition(); - } - - /** - * Evaluate the reference to the <code>key</code> or <code>id</code> - * function with the context specified by {@link #setStartNode(int)} - * and set up this iterator to iterate over the DTM nodes that are - * to be returned. - */ - protected void init() { - super.init(); - _position = 0; - - // All nodes retrieved are in the same document - int rootHandle = _dom.getAxisIterator(Axis.ROOT) - .setStartNode(_startNode).next(); - - // Is the argument not a node set? - if (_keyValueIterator == null) { - // Look up nodes returned for the single string argument - _nodes = lookupNodes(rootHandle, _keyValue); - - if (_nodes == null) { - _nodes = EMPTY_NODES; - } - } else { - DTMAxisIterator keyValues = _keyValueIterator.reset(); - int retrievedKeyValueIdx = 0; - boolean foundNodes = false; - - _nodes = null; - - // For each node in the node set argument, get the string value - // and look up the nodes returned by key or id for that string - // value. If at most one string value has nodes associated, - // the nodes will be stored in _nodes; otherwise, the nodes - // will be placed in a heap. - for (int keyValueNode = keyValues.next(); - keyValueNode != DTMAxisIterator.END; - keyValueNode = keyValues.next()) { - - String keyValue = BasisLibrary.stringF(keyValueNode, _dom); - - IntegerArray nodes = lookupNodes(rootHandle, keyValue); - - if (nodes != null) { - if (!foundNodes) { - _nodes = nodes; - foundNodes = true; - } else { - if (_nodes != null) { - addHeapNode(new KeyIndexHeapNode(_nodes)); - _nodes = null; - } - addHeapNode(new KeyIndexHeapNode(nodes)); - } - } - } - - if (!foundNodes) { - _nodes = EMPTY_NODES; - } - } - } - - /** - * Returns the number of nodes in this iterator. - * - * @return the number of nodes - */ - public int getLast() { - // If nodes are stored in _nodes, take advantage of the fact that - // there are no duplicates. Otherwise, fall back to the base heap - // implementaiton and hope it does a good job with this. - return (_nodes != null) ? _nodes.cardinality() : super.getLast(); - } - - /** - * Return the node at the given position. - * - * @param position The position - * @return The node at the given position. - */ - public int getNodeByPosition(int position) { - int node = DTMAxisIterator.END; - - // If nodes are stored in _nodes, take advantage of the fact that - // there are no duplicates and they are stored in document order. - // Otherwise, fall back to the base heap implementation to do a - // good job with this. - if (_nodes != null) { - if (position > 0) { - if (position <= _nodes.cardinality()) { - _position = position; - node = _nodes.at(position-1); - } else { - _position = _nodes.cardinality(); - } - } - } else { - node = super.getNodeByPosition(position); - } - - return node; - } - } -} |