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POComparator to compare Map Values
 

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  1. POComparator to compare Map Values
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    <p>I have an object with a method who's job it is to compare itself with another method. I've defined a custom comparator inside this method to do the job.</p> <p>The object has a property 'output' which is a <code>Map&lt;String, Map&lt;String, Object&gt;&gt;</code>, basically, I need to find a way to compare the values inside the second map with the other object's map values.</p> <p>The problem I'm having it finding a way to suitably determine whether one object is greater than, less than or equal to another based on the map values. I know it's possible using a bunch of conditions, but that's just not the road I want to go down.</p> <p>An example of the <code>Map&lt;String, Map&lt;String, Object&gt;&gt;</code> property value is:</p> <p><img src="https://i.stack.imgur.com/7LwhU.png" alt="enter image description here"></p> <p>P.S The values of the map will always be numeric.</p> <p>EDIT:</p> <p>Thanks for the responses.</p> <p>In the end I decided to go down the Classes route. Instead of having a <code>Map&lt;String, Map&lt;String, Object&gt;&gt;</code> property I had a <code>List&lt;SystemInformation&gt;</code>, which included a <code>Map&lt;String, Object&gt;</code> property which stored the key/value pairs. </p> <p>I created separate classes for memory, process and file descriptor information respectively and had them subclass the SystemInformation class. I implemented the Comparable interface on the SystemInformation class to compare the properties of two SystemInformation objects.</p> <p>Then I used a very simple weighing algorithm to decide a sort order for separate Reports, by use of a custom Comparator.</p> <p>Cheers.</p>
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    1. PTQuestion
    1. USNick
    1. USNick
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    1. CODo you want to compare pairs of leaves? Or is there some notion that one such tree is 'greater' than another instance?
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    2. COI don't see how you can do this without conditions. This would be organised in a structured way if you used proper custom classes instead of Maps. What have you found which works, and what didn't you like about it and why?
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      1. POComparator to compare Map Values
      1. USPeter Lawrey
    3. COOnly thing I can think of that might help would be predicated upon the keys of the inner maps being limited. From the data above, it would appear to be the case. If so, you could define an Enum for Keys that would know how to do the compares....
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      1. POComparator to compare Map Values
      1. USJoeG
 

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