TypedStatementListTemplateParameter


1   package spoon.template;
2   
3   import spoon.reflect.code.CtBlock;
4   import spoon.reflect.code.CtStatementList;
5   import spoon.reflect.declaration.CtClass;
6   import spoon.reflect.declaration.CtSimpleType;
7   
8   /**
9    * This class represents a template parameter that defines a statement list
10   * directly expressed in Java (the statement list ends with a return statement
11   * returning a expression of type <code>R</code>).
12   * 
13   * <p>
14   * To define a new statement list template parameter, you must subclass this
15   * class and implement the {@link #statements()} method, which actually defines
16   * the Java statements. It corresponds to a
17   * {@link spoon.reflect.code.CtStatementList}.
18   */
19  public abstract class TypedStatementListTemplateParameter<R> implements
20          TemplateParameterList<R> {
21  
22      /**
23       * Creates a new statement list template parameter.
24       */
25      public TypedStatementListTemplateParameter() {
26      }
27  
28      public CtStatementList<R> getSubstitution(CtSimpleType targetType) {
29          CtClass<?> c;
30          CtBlock<?> b;
31          c= targetType.getFactory().Template().get(this.getClass());
32          if(c==null) {
33              c=targetType.getFactory().Class().get(this.getClass());
34          }
35          CtStatementList<R> l = targetType.getFactory().Core()
36                  .createStatementList();
37          if (this instanceof Template) {
38              b = Substitution.substitute(targetType, (Template) this, c
39                      .getMethod("statements").getBody());
40          } else {
41              b = targetType.getFactory().Core().clone(c.getMethod("statements")
42                      .getBody());
43          }
44          l.setStatements(b.getStatements());
45          return l;
46      }
47  
48      public R S() {
49          return null;
50      }
51  
52      /**
53       * This method must be implemented to define the template statement list.
54       */
55      public abstract R statements() throws Throwable  ;
56  }
57
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