/*
* Copyright 2001-2004 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: NodeSortRecord.java,v 1.5 2005/09/28 13:48:36 pvedula Exp $
*/
package com.sun.org.apache.xalan.internal.xsltc.dom;
import java.text.CollationKey;
import java.text.Collator;
import java.util.Locale;
import com.sun.org.apache.xalan.internal.xsltc.CollatorFactory;
import com.sun.org.apache.xalan.internal.xsltc.DOM;
import com.sun.org.apache.xalan.internal.xsltc.TransletException;
import com.sun.org.apache.xalan.internal.xsltc.runtime.AbstractTranslet;
import com.sun.org.apache.xml.internal.utils.StringComparable;
/**
* Base class for sort records containing application specific sort keys
*/
public abstract class NodeSortRecord {
public static final int COMPARE_STRING = 0;
public static final int COMPARE_NUMERIC = 1;
public static final int COMPARE_ASCENDING = 0;
public static final int COMPARE_DESCENDING = 1;
/**
* A reference to a collator. May be updated by subclass if the stylesheet
* specifies a different language (will be updated iff _locale is updated).
* @deprecated This field continues to exist for binary compatibility.
* New code should not refer to it.
*/
private static final Collator DEFAULT_COLLATOR = Collator.getInstance();
/**
* A reference to the first Collator
* @deprecated This field continues to exist for binary compatibility.
* New code should not refer to it.
*/
protected Collator _collator = DEFAULT_COLLATOR;
protected Collator[] _collators;
/**
* A locale field that might be set by an instance of a subclass.
* @deprecated This field continues to exist for binary compatibility.
* New code should not refer to it.
*/
protected Locale _locale;
protected CollatorFactory _collatorFactory;
protected SortSettings _settings;
private DOM _dom = null;
private int _node; // The position in the current iterator
private int _last = 0; // Number of nodes in the current iterator
private int _scanned = 0; // Number of key levels extracted from DOM
private Object[] _values; // Contains Comparable objects
/**
* This constructor is run by a call to ClassLoader in the
* makeNodeSortRecord method in the NodeSortRecordFactory class. Since we
* cannot pass any parameters to the constructor in that case we just set
* the default values here and wait for new values through initialize().
*/
public NodeSortRecord(int node) {
_node = node;
}
public NodeSortRecord() {
this(0);
}
/**
* This method allows the caller to set the values that could not be passed
* to the default constructor.
*/
public final void initialize(int node, int last, DOM dom,
SortSettings settings)
throws TransletException
{
_dom = dom;
_node = node;
_last = last;
_settings = settings;
int levels = settings.getSortOrders().length;
_values = new Object[levels];
String colFactClassname = null;
try {
// -- W. Eliot Kimber (eliot@isogen.com)
colFactClassname =
System.getProperty("com.sun.org.apache.xalan.internal.xsltc.COLLATOR_FACTORY");
}
catch (SecurityException e) {
// If we can't read the propery, just use default collator
}
if (colFactClassname != null) {
try {
Object candObj = ObjectFactory.findProviderClass(
colFactClassname, ObjectFactory.findClassLoader(), true);
_collatorFactory = (CollatorFactory)candObj;
} catch (ClassNotFoundException e) {
throw new TransletException(e);
}
Locale[] locales = settings.getLocales();
_collators = new Collator[levels];
for (int i = 0; i < levels; i++){
_collators[i] = _collatorFactory.getCollator(locales[i]);
}
_collator = _collators[0];
} else {
_collators = settings.getCollators();
_collator = _collators[0];
}
}
/**
* Returns the node for this sort object
*/
public final int getNode() {
return _node;
}
/**
*
*/
public final int compareDocOrder(NodeSortRecord other) {
return _node - other._node;
}
/**
* Get the string or numeric value of a specific level key for this sort
* element. The value is extracted from the DOM if it is not already in
* our sort key vector.
*/
private final Comparable stringValue(int level) {
// Get value from our array if possible
if (_scanned <= level) {
AbstractTranslet translet = _settings.getTranslet();
Locale[] locales = _settings.getLocales();
String[] caseOrder = _settings.getCaseOrders();
// Get value from DOM if accessed for the first time
final String str = extractValueFromDOM(_dom, _node, level,
translet, _last);
final Comparable key =
StringComparable.getComparator(str, locales[level],
_collators[level],
caseOrder[level]);
_values[_scanned++] = key;
return(key);
}
return((Comparable)_values[level]);
}
private final Double numericValue(int level) {
// Get value from our vector if possible
if (_scanned <= level) {
AbstractTranslet translet = _settings.getTranslet();
// Get value from DOM if accessed for the first time
final String str = extractValueFromDOM(_dom, _node, level,
translet, _last);
Double num;
try {
num = new Double(str);
}
// Treat number as NaN if it cannot be parsed as a double
catch (NumberFormatException e) {
num = new Double(Double.NEGATIVE_INFINITY);
}
_values[_scanned++] = num;
return(num);
}
return((Double)_values[level]);
}
/**
* Compare this sort element to another. The first level is checked first,
* and we proceed to the next level only if the first level keys are
* identical (and so the key values may not even be extracted from the DOM)
*
* !!!!MUST OPTIMISE - THIS IS REALLY, REALLY SLOW!!!!
*/
public int compareTo(NodeSortRecord other) {
int cmp, level;
int[] sortOrder = _settings.getSortOrders();
int levels = _settings.getSortOrders().length;
int[] compareTypes = _settings.getTypes();
for (level = 0; level < levels; level++) {
// Compare the two nodes either as numeric or text values
if (compareTypes[level] == COMPARE_NUMERIC) {
final Double our = numericValue(level);
final Double their = other.numericValue(level);
cmp = our.compareTo(their);
}
else {
final Comparable our = stringValue(level);
final Comparable their = other.stringValue(level);
cmp = our.compareTo(their);
}
// Return inverse compare value if inverse sort order
if (cmp != 0) {
return sortOrder[level] == COMPARE_DESCENDING ? 0 - cmp : cmp;
}
}
// Compare based on document order if all sort keys are equal
return(_node - other._node);
}
/**
* Returns the array of Collators used for text comparisons in this object.
* May be overridden by inheriting classes
*/
public Collator[] getCollator() {
return _collators;
}
/**
* Extract the sort value for a level of this key.
*/
public abstract String extractValueFromDOM(DOM dom, int current, int level,
AbstractTranslet translet,
int last);
}
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