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392 lines
11 KiB
392 lines
11 KiB
/*
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* Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*/
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/*
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* Copyright 1999-2004 The Apache Software Foundation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* $Id: ExsltMath.java,v 1.1.2.1 2005/08/01 02:08:50 jeffsuttor Exp $
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*/
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package com.sun.org.apache.xalan.internal.lib;
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import com.sun.org.apache.xpath.internal.NodeSet;
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import org.w3c.dom.Node;
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import org.w3c.dom.NodeList;
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/**
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* This class contains EXSLT math extension functions.
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* It is accessed by specifying a namespace URI as follows:
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* <pre>
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* xmlns:math="http://exslt.org/math"
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* </pre>
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*
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* The documentation for each function has been copied from the relevant
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* EXSLT Implementer page.
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*
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* @see <a href="http://www.exslt.org/">EXSLT</a>
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* @xsl.usage general
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*/
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public class ExsltMath extends ExsltBase
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{
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// Constants
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private static String PI = "3.1415926535897932384626433832795028841971693993751";
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private static String E = "2.71828182845904523536028747135266249775724709369996";
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private static String SQRRT2 = "1.41421356237309504880168872420969807856967187537694";
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private static String LN2 = "0.69314718055994530941723212145817656807550013436025";
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private static String LN10 = "2.302585092994046";
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private static String LOG2E = "1.4426950408889633";
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private static String SQRT1_2 = "0.7071067811865476";
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/**
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* The math:max function returns the maximum value of the nodes passed as the argument.
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* The maximum value is defined as follows. The node set passed as an argument is sorted
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* in descending order as it would be by xsl:sort with a data type of number. The maximum
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* is the result of converting the string value of the first node in this sorted list to
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* a number using the number function.
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* <p>
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* If the node set is empty, or if the result of converting the string values of any of the
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* nodes to a number is NaN, then NaN is returned.
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*
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* @param nl The NodeList for the node-set to be evaluated.
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*
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* @return the maximum value found, NaN if any node cannot be converted to a number.
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*
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* @see <a href="http://www.exslt.org/">EXSLT</a>
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*/
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public static double max (NodeList nl)
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{
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if (nl == null || nl.getLength() == 0)
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return Double.NaN;
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double m = - Double.MAX_VALUE;
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for (int i = 0; i < nl.getLength(); i++)
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{
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Node n = nl.item(i);
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double d = toNumber(n);
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if (Double.isNaN(d))
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return Double.NaN;
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else if (d > m)
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m = d;
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}
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return m;
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}
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/**
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* The math:min function returns the minimum value of the nodes passed as the argument.
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* The minimum value is defined as follows. The node set passed as an argument is sorted
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* in ascending order as it would be by xsl:sort with a data type of number. The minimum
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* is the result of converting the string value of the first node in this sorted list to
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* a number using the number function.
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* <p>
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* If the node set is empty, or if the result of converting the string values of any of
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* the nodes to a number is NaN, then NaN is returned.
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*
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* @param nl The NodeList for the node-set to be evaluated.
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*
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* @return the minimum value found, NaN if any node cannot be converted to a number.
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*
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* @see <a href="http://www.exslt.org/">EXSLT</a>
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*/
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public static double min (NodeList nl)
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{
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if (nl == null || nl.getLength() == 0)
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return Double.NaN;
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double m = Double.MAX_VALUE;
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for (int i = 0; i < nl.getLength(); i++)
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{
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Node n = nl.item(i);
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double d = toNumber(n);
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if (Double.isNaN(d))
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return Double.NaN;
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else if (d < m)
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m = d;
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}
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return m;
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}
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/**
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* The math:highest function returns the nodes in the node set whose value is the maximum
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* value for the node set. The maximum value for the node set is the same as the value as
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* calculated by math:max. A node has this maximum value if the result of converting its
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* string value to a number as if by the number function is equal to the maximum value,
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* where the equality comparison is defined as a numerical comparison using the = operator.
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* <p>
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* If any of the nodes in the node set has a non-numeric value, the math:max function will
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* return NaN. The definition numeric comparisons entails that NaN != NaN. Therefore if any
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* of the nodes in the node set has a non-numeric value, math:highest will return an empty
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* node set.
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*
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* @param nl The NodeList for the node-set to be evaluated.
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*
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* @return node-set with nodes containing the maximum value found, an empty node-set
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* if any node cannot be converted to a number.
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*/
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public static NodeList highest (NodeList nl)
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{
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double maxValue = max(nl);
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NodeSet highNodes = new NodeSet();
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highNodes.setShouldCacheNodes(true);
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if (Double.isNaN(maxValue))
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return highNodes; // empty Nodeset
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for (int i = 0; i < nl.getLength(); i++)
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{
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Node n = nl.item(i);
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double d = toNumber(n);
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if (d == maxValue)
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highNodes.addElement(n);
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}
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return highNodes;
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}
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/**
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* The math:lowest function returns the nodes in the node set whose value is the minimum value
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* for the node set. The minimum value for the node set is the same as the value as calculated
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* by math:min. A node has this minimum value if the result of converting its string value to
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* a number as if by the number function is equal to the minimum value, where the equality
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* comparison is defined as a numerical comparison using the = operator.
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* <p>
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* If any of the nodes in the node set has a non-numeric value, the math:min function will return
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* NaN. The definition numeric comparisons entails that NaN != NaN. Therefore if any of the nodes
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* in the node set has a non-numeric value, math:lowest will return an empty node set.
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*
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* @param nl The NodeList for the node-set to be evaluated.
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*
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* @return node-set with nodes containing the minimum value found, an empty node-set
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* if any node cannot be converted to a number.
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*
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*/
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public static NodeList lowest (NodeList nl)
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{
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double minValue = min(nl);
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NodeSet lowNodes = new NodeSet();
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lowNodes.setShouldCacheNodes(true);
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if (Double.isNaN(minValue))
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return lowNodes; // empty Nodeset
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for (int i = 0; i < nl.getLength(); i++)
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{
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Node n = nl.item(i);
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double d = toNumber(n);
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if (d == minValue)
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lowNodes.addElement(n);
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}
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return lowNodes;
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}
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/**
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* The math:abs function returns the absolute value of a number.
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*
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* @param num A number
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* @return The absolute value of the number
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*/
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public static double abs(double num)
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{
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return Math.abs(num);
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}
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/**
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* The math:acos function returns the arccosine value of a number.
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*
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* @param num A number
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* @return The arccosine value of the number
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*/
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public static double acos(double num)
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{
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return Math.acos(num);
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}
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/**
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* The math:asin function returns the arcsine value of a number.
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*
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* @param num A number
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* @return The arcsine value of the number
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*/
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public static double asin(double num)
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{
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return Math.asin(num);
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}
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/**
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* The math:atan function returns the arctangent value of a number.
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*
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* @param num A number
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* @return The arctangent value of the number
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*/
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public static double atan(double num)
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{
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return Math.atan(num);
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}
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/**
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* The math:atan2 function returns the angle ( in radians ) from the X axis to a point (y,x).
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*
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* @param num1 The X axis value
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* @param num2 The Y axis value
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* @return The angle (in radians) from the X axis to a point (y,x)
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*/
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public static double atan2(double num1, double num2)
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{
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return Math.atan2(num1, num2);
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}
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/**
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* The math:cos function returns cosine of the passed argument.
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*
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* @param num A number
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* @return The cosine value of the number
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*/
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public static double cos(double num)
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{
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return Math.cos(num);
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}
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/**
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* The math:exp function returns e (the base of natural logarithms) raised to a power.
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*
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* @param num A number
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* @return The value of e raised to the given power
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*/
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public static double exp(double num)
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{
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return Math.exp(num);
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}
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/**
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* The math:log function returns the natural logarithm of a number.
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*
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* @param num A number
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* @return The natural logarithm of the number
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*/
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public static double log(double num)
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{
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return Math.log(num);
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}
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/**
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* The math:power function returns the value of a base expression taken to a specified power.
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*
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* @param num1 The base
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* @param num2 The power
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* @return The value of the base expression taken to the specified power
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*/
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public static double power(double num1, double num2)
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{
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return Math.pow(num1, num2);
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}
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/**
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* The math:random function returns a random number from 0 to 1.
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*
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* @return A random double from 0 to 1
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*/
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public static double random()
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{
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return Math.random();
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}
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/**
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* The math:sin function returns the sine of the number.
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*
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* @param num A number
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* @return The sine value of the number
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*/
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public static double sin(double num)
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{
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return Math.sin(num);
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}
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/**
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* The math:sqrt function returns the square root of a number.
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*
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* @param num A number
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* @return The square root of the number
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*/
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public static double sqrt(double num)
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{
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return Math.sqrt(num);
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}
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/**
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* The math:tan function returns the tangent of the number passed as an argument.
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*
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* @param num A number
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* @return The tangent value of the number
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*/
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public static double tan(double num)
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{
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return Math.tan(num);
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}
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/**
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* The math:constant function returns the specified constant to a set precision.
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* The possible constants are:
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* <pre>
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* PI
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* E
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* SQRRT2
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* LN2
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* LN10
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* LOG2E
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* SQRT1_2
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* </pre>
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* @param name The name of the constant
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* @param precision The precision
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* @return The value of the specified constant to the given precision
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*/
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public static double constant(String name, double precision)
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{
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String value = null;
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if (name.equals("PI"))
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value = PI;
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else if (name.equals("E"))
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value = E;
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else if (name.equals("SQRRT2"))
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value = SQRRT2;
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else if (name.equals("LN2"))
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value = LN2;
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else if (name.equals("LN10"))
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value = LN10;
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else if (name.equals("LOG2E"))
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value = LOG2E;
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else if (name.equals("SQRT1_2"))
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value = SQRT1_2;
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if (value != null)
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{
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int bits = new Double(precision).intValue();
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if (bits <= value.length())
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value = value.substring(0, bits);
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return Double.parseDouble(value);
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}
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else
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return Double.NaN;
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}
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}
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