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Questions tagged [class-hierarchy]

Class hierarchy refers to a set of classes and their inter-relationships.

A classification of object types, denoting objects as the instantiations of classes (class is like a blueprint, the object is what is built from that blueprint) inter-relating the various classes by relationships such as "inherits", "extends", "is an abstraction of", "an interface definition".

http://en.wikipedia.org/wiki/Class_hierarchy

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Overloading with a class hierarchy - most derived not used

The problem I am trying to avoid code that looks like the following: If(object Is Man) Return Image("Man") ElseIf(object Is Woman) Return Image("Woman") Else Return Image("Unknown Object") I thought I could do this through method overloading,…
Lee
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Spring(Java): Aspect is not triggered in non linear class hierarchy

When class hierarchy is not linear, aspect is not triggered when defined on base interface. The most interesting: when adding delegating implementation (see last code block) to the parent class of the implementation, the test becomes Green (Aspect…
Sergej Werfel
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C# property not available in derived class

I'm not sure what's going on. I have the following base class: public class MyRow : IStringIndexable, System.Collections.IEnumerable, ICollection>, IEnumerable>, …
Sarah Vessels
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Create inheritance graphs/trees for Django templates

Is there any tool out there that would take a directory with a Django application, scan it for templates and draw/print/list a hierarchy of inheritance between templates? Seeing which blocks are being overridden at every level would be an especially…
Tommalla
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Spring JDBC RowMapper with Class Hierarchies

I wanted to know what the community considers the "best practices" in respect to mapping class hierarchies with Spring JDBC. We do not have the ability to use a full fledged ORM tool, however we are using the Spring JDBC to alleviate some of the…
jnt30
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Is there any reason for an empty concrete method in an abstract class?

I was recently looking through some open source code PicketLink code. If you take a look at this class, you'll see a number of concrete methods in an abstract class that do nothing. Is there any purpose whatsoever for this? I thought about two…
josh-cain
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Pharo/Squeak - How do I quickly browse the implementation of a given method in a given class?

Let's say I want to see how "copy" is implemented in the Dictionary class. Currently I use the system browser and manually traverse the inheritance hierarchy (bottom up) until I find the class that implements the given message. Is there a one-liner…
Janus Troelsen
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Giant switch statement for constructors

I have a container which holds a bunch of pointers to a base class, and a function which takes some input and returns a class which is a subclass of the base class. Which subclass it returns depends on the input. Right now, I have a giant switch…
Seth Carnegie
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Compile time tree structure

I want to retrieve values from a tree stored in another system. For example: GetValue("Vehicle.Car.Ford.Focus.Engine.Oil.Color") To avoid typing errors and invalid keys, I want to check the name at compile time by creating an object or class with…
Sjoerd
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reinterpret_cast vector of pointers to vector of pointers to base class

Consider the following piece of code #include #include #include #include struct Base { int x; Base(int x) : x(x) {} }; struct Derived : public Base { int y, z; Derived(int x) : Base(x),…
Rafal
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PHP Class finds Class file but not Class in the file

I've defined an abstract superclass in one file and a subclass in another. I have required the super-classes file and the stack trace reports to find an include it. However, it then returns an error when it hits the 'extends' line: Fatal error:…
Daniel Bingham
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c# implement interface method with parameter of subclass type

I have this desired class hierarchy: interface IClass { string print(IClass item); } class MyClass : IClass { // invalid interface implementation // parameter type should be IClass not MyClass string print(MyClass item) { return…
Angie
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Is there any relation between the class that implements interface and that interface?

Consider this class hierarchy: Book extends Goods Book implements Taxable As we know, there is a relationship between a subclass and its superclass (is-a). Q: Is there any relationship like "is-a" between Book and Taxable? GOOD Answers, but you…
Johanna
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Calling child method, when cast to parent type in java

I am having problems with some course work i'm trying to finish off and any help would be appreciated! I have 3 types of accounts which extend an abstract type "Account".. [CurrentAccount, StaffAccount and MortgageAccount]. I am trying to read in…
krex
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Define a hierarchy of model classes in CakePHP

By default CakePHP has a AppModel class and every model of an application inherits from it. A common design pattern to share logic between models is to create a behavior and configure a model to $actAs that behavior. But what if I wanted to…
elitalon
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