Move FactoryExpression expansion and compression to an adapter

[Timo Westkämper]

Currently the FactoryExpression and expansion and compression contract is bound to the FactoryExpression implementations themselves. To simplify FactoryExpression creation the expansion and compression could be moved to an decorator implementation.

[Timo Westkämper (timo-westkamper)]

Here is a simple example of the wrapping :

// original arguments
    StringPath str1 = new StringPath("str1");
    StringPath str2 = new StringPath("str2");
    StringPath str3 = new StringPath("str3");
    StringPath str4 = new StringPath("str3");

// orginal factory expression
    Concatenation concat2 = new Concatenation(new Concatenation(str1, new Concatenation(str2, str3)), str4);

// wrapped
    FactoryExpression<String> wrapped = FactoryExpressionUtils.wrap(concat2);
    assertEquals(Arrays.asList(str1, str2, str3, str4), wrapped.getArgs());
    assertEquals("1234", wrapped.newInstance("1","2","3","4"));

The FactoryExpressionUtils.wrap(...) call should only be used in Query implementation to normalize a FactoryExpression

[Timo Westkämper (timo-westkamper)]

Released in 2.1.2