How to assign all matching properties from Groovy object to Java object?

Question

I want to use Groovy with JDBC to load some data from a table. I then want to copy the properties across where the property names match. How can I do this in Groovy?

Som

Answer 1

Some groovy magic helps:

def filtered = ['property1', 'property2', ....]

sql.eachRow("select * from temp_table") {

        def e = new MyJavaClass(it.properties.findAll{filtered.contains(it.key)})

}

Given that

• list filtered contains all property names that you intend to copy;
• your table column names correspond to MyJavaClass declared property names (the same as in the list filtered);
• MyJavaClass has both default (empty) constructor and constructor that takes all properties as parameters;
• MyJavaClass declares public setters for properties;

E.g:

   public MyJavaClass() {}

   public MyJavaClass(String property1, String property2, ....) {
       this.property1 = property1;
       this.property2 = property2;
       .... }

   public void setProperty1(String property1) {this.property1 = property1;}
   public void setProperty2(String property2) {this.property2 = property2;}
   ....

You may use filtered as a list of undesired properties like this:

def filtered = ['class', 'metaClass', ....]

then:

def e = new MyJavaClass(it.properties.findAll{!filtered.contains(it.key)})