Nullcheck abstraction ideas.

NullcheckAbstractionsExamples.java

public class NullcheckAbstractionsExamples {
  public void Example1( ) {
    NullablePair pair;
     
    pair = Nullables.pair(myObject1.getProperty(), myObject2.getProperty());
    if (pair.anyNull())
       return pair.compare();
       
    pair = Nullables.pair(myObject1.getProperty().getSubProperty(), myObject2.getProperty().getSubProperty());
    if (pair.anyNull())
       return pair.compare();
       
    return ComparisonChain.start().compare(myObject1.getProperty().getSubProperty().value(),
        myObject2.getProperty().getSubProperty().value());
  }
  
  public void Example2a() {
    ComparisonChain chain = ComparisonChain.start();
    
    try {
      chain = chain.compareNull(myObject1.getProperty(), myObject2.getProperty());
      chain = chain.compareNull(myObject1.getProperty().getSubProperty(), myObject2.getProperty().getSubProperty());
    } except (ComparisonChain.NullComparisonFallbackException e) {
      return e.compare();
    }
    
    return chain.compare(myObject1.getProperty().getSubProperty().value(),
      myObject2.getProperty().getSubProperty().value()).result();
  }
  
  public void Example2b() {
    ComparisonChain chain = ComparisonChain.start();
    
    try {
      chain = chain.compareNull(myObject1.getProperty(), myObject2.getProperty());
      chain = chain.compare(myObject1.getProperty().name(), myObject2.getProperty().name());
      chain = chain.compareNull(myObject1.getProperty().getSubProperty(), myObject2.getProperty().getSubProperty());
      chain = chain.compare(myObject1.getProperty().getSubProperty().value(),
        myObject2.getProperty().getSubProperty().value())
    } except (ComparisonChain.NullComparisonFallbackException e) {
      return e.compare();
    }
    
    return chain.result()
    
  }
}