- /*
- * The Apache Software License, Version 1.1
- *
- *
- * Copyright (c) 1999 The Apache Software Foundation. All rights
- * reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The end-user documentation included with the redistribution,
- * if any, must include the following acknowledgment:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself,
- * if and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "Xalan" and "Apache Software Foundation" must
- * not be used to endorse or promote products derived from this
- * software without prior written permission. For written
- * permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache",
- * nor may "Apache" appear in their name, without prior written
- * permission of the Apache Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation and was
- * originally based on software copyright (c) 1999, Lotus
- * Development Corporation., http://www.lotus.com. For more
- * information on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- */
- package org.apache.xpath.objects;
-
- import javax.xml.transform.TransformerException;
- import org.apache.xpath.ExpressionOwner;
- import org.apache.xpath.XPathContext;
- import org.apache.xpath.XPathVisitor;
-
- /**
- * <meta name="usage" content="general"/>
- * This class represents an XPath number, and is capable of
- * converting the number to other types, such as a string.
- */
- public class XNumber extends XObject
- {
-
- /** Value of the XNumber object.
- * @serial */
- double m_val;
-
- /**
- * Construct a XNodeSet object.
- *
- * @param d Value of the object
- */
- public XNumber(double d)
- {
- super();
-
- m_val = d;
- }
-
- /**
- * Construct a XNodeSet object.
- *
- * @param d Value of the object
- */
- public XNumber(Number num)
- {
-
- super();
-
- m_val = num.doubleValue();
- m_obj = num;
- }
-
- /**
- * Tell that this is a CLASS_NUMBER.
- *
- * @return node type CLASS_NUMBER
- */
- public int getType()
- {
- return CLASS_NUMBER;
- }
-
- /**
- * Given a request type, return the equivalent string.
- * For diagnostic purposes.
- *
- * @return type string "#NUMBER"
- */
- public String getTypeString()
- {
- return "#NUMBER";
- }
-
- /**
- * Cast result object to a number.
- *
- * @return the value of the XNumber object
- */
- public double num()
- {
- return m_val;
- }
-
- /**
- * Evaluate expression to a number.
- *
- * @return 0.0
- *
- * @throws javax.xml.transform.TransformerException
- */
- public double num(XPathContext xctxt)
- throws javax.xml.transform.TransformerException
- {
-
- return m_val;
- }
-
- /**
- * Cast result object to a boolean.
- *
- * @return false if the value is NaN or equal to 0.0
- */
- public boolean bool()
- {
- return (Double.isNaN(m_val) || (m_val == 0.0)) ? false : true;
- }
-
- // /**
- // * Cast result object to a string.
- // *
- // * @return "NaN" if the number is NaN, Infinity or -Infinity if
- // * the number is infinite or the string value of the number.
- // */
- // private static final int PRECISION = 16;
- // public String str()
- // {
- //
- // if (Double.isNaN(m_val))
- // {
- // return "NaN";
- // }
- // else if (Double.isInfinite(m_val))
- // {
- // if (m_val > 0)
- // return "Infinity";
- // else
- // return "-Infinity";
- // }
- //
- // long longVal = (long)m_val;
- // if ((double)longVal == m_val)
- // return Long.toString(longVal);
- //
- //
- // String s = Double.toString(m_val);
- // int len = s.length();
- //
- // if (s.charAt(len - 2) == '.' && s.charAt(len - 1) == '0')
- // {
- // return s.substring(0, len - 2);
- // }
- //
- // int exp = 0;
- // int e = s.indexOf('E');
- // if (e != -1)
- // {
- // exp = Integer.parseInt(s.substring(e + 1));
- // s = s.substring(0,e);
- // len = e;
- // }
- //
- // // Calculate Significant Digits:
- // // look from start of string for first digit
- // // look from end for last digit
- // // significant digits = end - start + (0 or 1 depending on decimal location)
- //
- // int decimalPos = -1;
- // int start = (s.charAt(0) == '-') ? 1 : 0;
- // findStart: for( ; start < len; start++ )
- // {
- // switch (s.charAt(start))
- // {
- // case '0':
- // break;
- // case '.':
- // decimalPos = start;
- // break;
- // default:
- // break findStart;
- // }
- // }
- // int end = s.length() - 1;
- // findEnd: for( ; end > start; end-- )
- // {
- // switch (s.charAt(end))
- // {
- // case '0':
- // break;
- // case '.':
- // decimalPos = end;
- // break;
- // default:
- // break findEnd;
- // }
- // }
- //
- // int sigDig = end - start;
- //
- // // clarify decimal location if it has not yet been found
- // if (decimalPos == -1)
- // decimalPos = s.indexOf('.');
- //
- // // if decimal is not between start and end, add one to sigDig
- // if (decimalPos < start || decimalPos > end)
- // ++sigDig;
- //
- // // reduce significant digits to PRECISION if necessary
- // if (sigDig > PRECISION)
- // {
- // // re-scale BigDecimal in order to get significant digits = PRECISION
- // BigDecimal num = new BigDecimal(s);
- // int newScale = num.scale() - (sigDig - PRECISION);
- // if (newScale < 0)
- // newScale = 0;
- // s = num.setScale(newScale, BigDecimal.ROUND_HALF_UP).toString();
- //
- // // remove trailing '0's; keep track of decimalPos
- // int truncatePoint = s.length();
- // while (s.charAt(--truncatePoint) == '0')
- // ;
- //
- // if (s.charAt(truncatePoint) == '.')
- // {
- // decimalPos = truncatePoint;
- // }
- // else
- // {
- // decimalPos = s.indexOf('.');
- // truncatePoint += 1;
- // }
- //
- // s = s.substring(0, truncatePoint);
- // len = s.length();
- // }
- //
- // // Account for exponent by adding zeros as needed
- // // and moving the decimal place
- //
- // if (exp == 0)
- // return s;
- //
- // start = 0;
- // String sign;
- // if (s.charAt(0) == '-')
- // {
- // sign = "-";
- // start++;
- // }
- // else
- // sign = "";
- //
- // String wholePart = s.substring(start, decimalPos);
- // String decimalPart = s.substring(decimalPos + 1);
- //
- // // get the number of digits right of the decimal
- // int decimalLen = decimalPart.length();
- //
- // if (exp >= decimalLen)
- // return sign + wholePart + decimalPart + zeros(exp - decimalLen);
- //
- // if (exp > 0)
- // return sign + wholePart + decimalPart.substring(0, exp) + "."
- // + decimalPart.substring(exp);
- //
- // return sign + "0." + zeros(-1 - exp) + wholePart + decimalPart;
- // }
-
- /**
- * Cast result object to a string.
- *
- * @return "NaN" if the number is NaN, Infinity or -Infinity if
- * the number is infinite or the string value of the number.
- */
- public String str()
- {
-
- if (Double.isNaN(m_val))
- {
- return "NaN";
- }
- else if (Double.isInfinite(m_val))
- {
- if (m_val > 0)
- return "Infinity";
- else
- return "-Infinity";
- }
-
- double num = m_val;
- String s = Double.toString(num);
- int len = s.length();
-
- if (s.charAt(len - 2) == '.' && s.charAt(len - 1) == '0')
- {
- s = s.substring(0, len - 2);
-
- if (s.equals("-0"))
- return "0";
-
- return s;
- }
-
- int e = s.indexOf('E');
-
- if (e < 0)
- return s;
-
- int exp = Integer.parseInt(s.substring(e + 1));
- String sign;
-
- if (s.charAt(0) == '-')
- {
- sign = "-";
- s = s.substring(1);
-
- --e;
- }
- else
- sign = "";
-
- int nDigits = e - 2;
-
- if (exp >= nDigits)
- return sign + s.substring(0, 1) + s.substring(2, e)
- + zeros(exp - nDigits);
-
- if (exp > 0)
- return sign + s.substring(0, 1) + s.substring(2, 2 + exp) + "."
- + s.substring(2 + exp, e);
-
- return sign + "0." + zeros(-1 - exp) + s.substring(0, 1)
- + s.substring(2, e);
- }
-
-
- /**
- * Return a string of '0' of the given length
- *
- *
- * @param n Length of the string to be returned
- *
- * @return a string of '0' with the given length
- */
- static private String zeros(int n)
- {
- if (n < 1)
- return "";
-
- char[] buf = new char[n];
-
- for (int i = 0; i < n; i++)
- {
- buf[i] = '0';
- }
-
- return new String(buf);
- }
-
- /**
- * Return a java object that's closest to the representation
- * that should be handed to an extension.
- *
- * @return The value of this XNumber as a Double object
- */
- public Object object()
- {
- if(null == m_obj)
- m_obj = new Double(m_val);
- return m_obj;
- }
-
- /**
- * Tell if two objects are functionally equal.
- *
- * @param obj2 Object to compare this to
- *
- * @return true if the two objects are equal
- *
- * @throws javax.xml.transform.TransformerException
- */
- public boolean equals(XObject obj2)
- {
-
- // In order to handle the 'all' semantics of
- // nodeset comparisons, we always call the
- // nodeset function.
- int t = obj2.getType();
- try
- {
- if (t == XObject.CLASS_NODESET)
- return obj2.equals(this);
- else if(t == XObject.CLASS_BOOLEAN)
- return obj2.bool() == bool();
- else
- return m_val == obj2.num();
- }
- catch(javax.xml.transform.TransformerException te)
- {
- throw new org.apache.xml.utils.WrappedRuntimeException(te);
- }
- }
-
- /**
- * Tell if this expression returns a stable number that will not change during
- * iterations within the expression. This is used to determine if a proximity
- * position predicate can indicate that no more searching has to occur.
- *
- *
- * @return true if the expression represents a stable number.
- */
- public boolean isStableNumber()
- {
- return true;
- }
-
- /**
- * @see XPathVisitable#callVisitors(ExpressionOwner, XPathVisitor)
- */
- public void callVisitors(ExpressionOwner owner, XPathVisitor visitor)
- {
- visitor.visitNumberLiteral(owner, this);
- }
-
-
- }