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public class MyFounderNumberComparer : IEqualityComparer<int> { public bool Equals(int x, int y) { return(isFounder(x) == isFounder(y)); } public int GetHashCode(int i) { int f = 1; int nf = 100; return (isFounder(i) f.GetHashCode() : nf.GetHashCode()); } public bool isFounder(int id) { return(id < 100); } } In addition to the methods required by the interface, we have added a method, isFounder, to determine whether an employee is a founder based on our definition. This just makes the code a little easier to understand. We have made that method public so that we can call it from outside the interface, which you will see us do in our example. Our equality comparer is going to consider any integer less than 100 as representing a founder, and if two integers signify either both founders or both nonfounders, they are considered equal. For the purposes of producing a hash code, we return a hash code of 1 for a founder and 100 for a nonfounder so that all founders end up in the same group and all nonfounders end up in another group. Our GroupBy example code is in Listing 4-31.

string name = presidents.FirstOrDefault(p => p.StartsWith("Z")); Console.WriteLine(name == null "NULL" : name); Since there is no name in the presidents array beginning with a "Z", here are the results:

MyFounderNumberComparer comp = new MyFounderNumberComparer(); EmployeeOptionEntry[] empOptions = EmployeeOptionEntry.GetEmployeeOptionEntries(); IEnumerable<IGrouping<int, EmployeeOptionEntry>> opts = empOptions .GroupBy(o => o.id, comp); // First enumerate through the sequence of IGroupings. foreach (IGrouping<int, EmployeeOptionEntry> keyGroup in opts) { Console.WriteLine("Option records for: " + (comp.isFounder(keyGroup.Key) "founder" : "non-founder"));

The Last operator returns the last element of a sequence, or the last element of a sequence matching a predicate, depending on the prototype used.

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// Now enumerate through the grouping's sequence of EmployeeOptionEntry elements. foreach (EmployeeOptionEntry element in keyGroup) Console.WriteLine("id={0} : optionsCount={1} : dateAwarded={2:d}", element.id, element.optionsCount, element.dateAwarded); } In the example, we instantiate our equality comparer object ahead of time, as opposed to doing it in the call to the GroupBy method, so that we can use it to call the isFounder method in the foreach loop. Here are the results from this code: Option id=1 : id=2 : id=2 : id=3 : id=2 : id=3 : id=3 : id=4 : Option id=101 records for: founder optionsCount=2 : dateAwarded=12/31/1999 optionsCount=10000 : dateAwarded=6/30/1992 optionsCount=10000 : dateAwarded=1/1/1994 optionsCount=5000 : dateAwarded=9/30/1997 optionsCount=10000 : dateAwarded=4/1/2003 optionsCount=7500 : dateAwarded=9/30/1998 optionsCount=7500 : dateAwarded=9/30/1998 optionsCount=1500 : dateAwarded=12/31/1997 records for: non-founder : optionsCount=2 : dateAwarded=12/31/1998

Code Sample 10-6. The DynamicRenderKitViewHandler Class package com.apress.projsf.ch10.application; import java.util.regex.Matcher; import java.util.regex.Pattern; import import import import javax.faces.application.Application; javax.faces.application.ViewHandler; javax.faces.context.FacesContext; javax.faces.el.ValueBinding;

As you can see, all employee options records for an employee whose id is less than 100 are grouped with the founders. Otherwise, they are grouped with the nonfounders. For an example of the third GroupBy prototype, we ll assume we are interested only in getting the dates that the options were awarded for each employee. This code will be very similar to the example for the first prototype. So in Listing 4-32, instead of returning a sequence of groupings of EmployeeOptionEntry objects, we will have groupings of dates.

There are two prototypes I cover. The First Last Prototype public static T Last<T>( this IEnumerable<T> source); Using this prototype, the Last operator enumerates the input sequence named source and returns the last element of the sequence. The second prototype of Last allows a predicate to be passed and looks like this: The Second Last Prototype public static T Last<T>( this IEnumerable<T> source, Func<T, bool> predicate); This version of the Last operator returns the last element it finds for which the predicate returns true.

EmployeeOptionEntry[] empOptions = EmployeeOptionEntry.GetEmployeeOptionEntries(); IEnumerable<IGrouping<int, DateTime>> opts = empOptions .GroupBy(o => o.id, e => e.dateAwarded); // First enumerate through the sequence of IGroupings. foreach (IGrouping<int, DateTime> keyGroup in opts) { Console.WriteLine("Option records for employee: " + keyGroup.Key); // Now enumerate through the grouping's sequence of DateTime elements. foreach (DateTime date in keyGroup) Console.WriteLine(date.ToShortDateString()); }

ArgumentNullException is thrown if any arguments are null. InvalidOperationException is thrown if the source sequence is empty or if the predicate never returns true.

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