Enable generation of default (0-arguments) constructor when extending classes

If the developer extends a base class with no default constructor, they have no way of explicitly specifying that they want a default constructor code to be generated in Java. This is a certain limitation if the class needs to be declared in the AndroidManifest and is instantiated by the system (attempting to use IntentService is one such case - Android will attempt to create an instance of the implementation of IntentService, but will crash, as it tries to invoke a default constructor, which the developer cannot declare).

Given the following Java class:

package a.b;

public class Base {
    public Base(String a) { ... }       
}

and the following implementation in JavaScript:

a.b.Base.extend("a.b.ExtendedBase", {
    init: function() {
     _this("arbitrary string");      
     // -> will introduce additional logic in the sole ctor block
     // in Java, but will not create an additional constructor
    }  
});

will output

package a.b;

@com.tns.JavaScriptImplementation(javaScriptFile = "./ExtendedBase.js")
public class ExtendedBase extends a.b.Base implements com.tns.NativeScriptHashCodeProvider {
        /* No default constructor */

    public ExtendedBase (java.lang.String param_0){
        super(param_0);
                /* 
                    Additional logic to handle more arguments -> a result of the init function
                */                 
        com.tns.Runtime.initInstance(this);
    }

    public boolean equals__super(java.lang.Object other) {
        return super.equals(other);
    }

    public int hashCode__super() {
        return super.hashCode();
    }
}

Developers have no way to declare a default constructor for a.b.ExtendedBase.

Instead what I need is

package a.b;

@com.tns.JavaScriptImplementation(javaScriptFile = "./ExtendedBase.js")
public class ExtendedBase extends a.b.Base implements com.tns.NativeScriptHashCodeProvider {
        /* default constructor */
        public ExtendedBase () {
        this("Arbitrary String");
    }

    public ExtendedBase (java.lang.String param_0){
        super(param_0);
                /* 
                    Additional logic to handle more arguments -> a result of the init function
                */                 
        com.tns.Runtime.initInstance(this);
    }
}

Generating custom constructors based on the javascript code will require additional analysis, and may not be worth looking into at the moment.

L’issue fornisce esempi in JavaScript e Java, ma non indica alcun file sorgente, test o punto di ingresso. Inizia individuando il percorso di generazione dei costruttori per le estensioni delle classi; il lavoro è completato quando un’estensione di una classe base priva di un costruttore senza argomenti può esporre un costruttore senza argomenti generato che delega come specificato, con la copertura del caso mostrato.