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 * reserved comment block

 * DO NOT REMOVE OR ALTER!

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/*

 * 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

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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.Translet;

import com.sun.org.apache.xalan.internal.xsltc.util.IntegerArray;

import com.sun.org.apache.xml.internal.dtm.DTMAxisIterator;

import com.sun.org.apache.xml.internal.dtm.Axis;

/**

 * @author Jacek Ambroziak

 * @author Santiago Pericas-Geertsen

 */

public abstract class MultipleNodeCounter extends NodeCounter {

    private DTMAxisIterator _precSiblings = null;

    public MultipleNodeCounter(Translet translet,

                               DOM document, DTMAxisIterator iterator) {

        super(translet, document, iterator);

    }

    public MultipleNodeCounter(Translet translet,

                               DOM document,

                               DTMAxisIterator iterator,

                               boolean hasFrom) {

        super(translet, document, iterator, hasFrom);

    }

    public NodeCounter setStartNode(int node) {

        _node = node;

        _nodeType = _document.getExpandedTypeID(node);

    _precSiblings = _document.getAxisIterator(Axis.PRECEDINGSIBLING);

        return this;

    }

    public String getCounter() {

        if (_value != Integer.MIN_VALUE) {

            //See Errata E24

            if (_value == 0) return "0";

            else if (Double.isNaN(_value)) return "NaN";

            else if (_value < 0 && Double.isInfinite(_value)) return "-Infinity";

            else if (Double.isInfinite(_value)) return "Infinity";

            else return formatNumbers((int)_value);

        }

        IntegerArray ancestors = new IntegerArray();

        // Gather all ancestors that do not match from pattern

        int next = _node;

        ancestors.add(next);            // include self

        while ((next = _document.getParent(next)) > END &&

               !matchesFrom(next)) {

            ancestors.add(next);

        }

        // Create an array of counters

        final int nAncestors = ancestors.cardinality();

        final int[] counters = new int[nAncestors];

        for (int i = 0; i < nAncestors; i++) {

            counters[i] = Integer.MIN_VALUE;

        }

        // Increment array of counters according to semantics

        for (int j = 0, i = nAncestors - 1; i >= 0 ; i--, j++) {

            final int counter = counters[j];

            final int ancestor = ancestors.at(i);

            if (matchesCount(ancestor)) {

                _precSiblings.setStartNode(ancestor);

                while ((next = _precSiblings.next()) != END) {

                    if (matchesCount(next)) {

                        counters[j] = (counters[j] == Integer.MIN_VALUE) ? 1

                            : counters[j] + 1;

                    }

                }

                // Count the node itself

                counters[j] = counters[j] == Integer.MIN_VALUE

                    ? 1

                    : counters[j] + 1;

            }

        }

        return formatNumbers(counters);

    }

    public static NodeCounter getDefaultNodeCounter(Translet translet,

                                                    DOM document,

                                                    DTMAxisIterator iterator) {

        return new DefaultMultipleNodeCounter(translet, document, iterator);

    }

    static class DefaultMultipleNodeCounter extends MultipleNodeCounter {

        public DefaultMultipleNodeCounter(Translet translet,

                                          DOM document,

                                          DTMAxisIterator iterator) {

            super(translet, document, iterator);

        }

    }

}