23  * questions.
  24  */
  25 
  26 package com.sun.org.apache.xerces.internal.jaxp.datatype;
  27 
  28 import java.math.BigInteger;
  29 import javax.xml.datatype.DatatypeConstants;
  30 
  31 
  32 /**
  33  * <p>Represent a subtype <code>xdt:yearMonthDuration</code> of a <code>Duration</code>
  34  * as specified in <a href="http://www.w3.org/TR/xpath-datamodel#yearMonthDuration">
  35  *   XQuery 1.0 and XPath 2.0 Data Model, xdt:yearMonthDuration</a>.</p>
  36  *
  37  *
  38  * <p>The DurationYearMonth object represents a period of Gregorian time,
  39  * with a lexical representation, "<em>PnYnM</em>" that contains only year and month components.
  40  * </p>
  41  *
  42  *
  43  * @author <a href="mailto:Vikram.Aroskar@Sun.COM">Vikram Aroskar</a>
  44  * @author <a href="mailto:Huizhe.wang@oracle.com">Joe Wang</a>
  45 
  46  * @see XMLGregorianCalendar#add(Duration)
  47  */
  48 
  49 class DurationYearMonthImpl
  50         extends DurationImpl {
  51     private static final long serialVersionUID = -4430140662861507958L;
  52 
  53     /**
  54      * <p>Constructs a new Duration object by specifying each field individually.</p>
  55      *
  56      * <p>All the parameters are optional as long as at least one field is present.
  57      * If specified, parameters have to be zero or positive.</p>
  58      *
  59      * @param isPositive Set to <code>false</code> to create a negative duration. When the length
  60      *   of the duration is zero, this parameter will be ignored.
  61      * @param years of this <code>Duration</code>
  62      * @param months of this <code>Duration</code>
  63      *
  64      * @throws IllegalArgumentException
  65      *    If years, months parameters are all <code>null</code>. Or if any

  23  * questions.
  24  */
  25 
  26 package com.sun.org.apache.xerces.internal.jaxp.datatype;
  27 
  28 import java.math.BigInteger;
  29 import javax.xml.datatype.DatatypeConstants;
  30 
  31 
  32 /**
  33  * <p>Represent a subtype <code>xdt:yearMonthDuration</code> of a <code>Duration</code>
  34  * as specified in <a href="http://www.w3.org/TR/xpath-datamodel#yearMonthDuration">
  35  *   XQuery 1.0 and XPath 2.0 Data Model, xdt:yearMonthDuration</a>.</p>
  36  *
  37  *
  38  * <p>The DurationYearMonth object represents a period of Gregorian time,
  39  * with a lexical representation, "<em>PnYnM</em>" that contains only year and month components.
  40  * </p>
  41  *
  42  *
  43  * @author Vikram Aroskar


  44  * @see XMLGregorianCalendar#add(Duration)
  45  */
  46 
  47 class DurationYearMonthImpl
  48         extends DurationImpl {
  49     private static final long serialVersionUID = -4430140662861507958L;
  50 
  51     /**
  52      * <p>Constructs a new Duration object by specifying each field individually.</p>
  53      *
  54      * <p>All the parameters are optional as long as at least one field is present.
  55      * If specified, parameters have to be zero or positive.</p>
  56      *
  57      * @param isPositive Set to <code>false</code> to create a negative duration. When the length
  58      *   of the duration is zero, this parameter will be ignored.
  59      * @param years of this <code>Duration</code>
  60      * @param months of this <code>Duration</code>
  61      *
  62      * @throws IllegalArgumentException
  63      *    If years, months parameters are all <code>null</code>. Or if any