Support interfaces in Records

- Fixes #265

api/src/main/java/org/jboss/forge/roaster/model/JavaRecord.java

@@ -11,7 +11,8 @@
 public interface JavaRecord<O extends JavaRecord<O>> extends
          JavaType<O>,
          MethodHolder<O>,
-         TypeHolder<O>
+         TypeHolder<O>,
+         InterfaceCapable
 {
    /**
     * @return the list of {@link JavaRecordComponent} for this record

api/src/main/java/org/jboss/forge/roaster/model/source/JavaRecordSource.java

@@ -9,7 +9,8 @@ public interface JavaRecordSource extends
          JavaSource<JavaRecordSource>,
          JavaRecord<JavaRecordSource>,
          MethodHolderSource<JavaRecordSource>,
-         TypeHolderSource<JavaRecordSource>
+         TypeHolderSource<JavaRecordSource>,
+         InterfaceCapableSource<JavaRecordSource>
 {
    JavaRecordComponentSource addRecordComponent(String type, String name);
    JavaRecordComponentSource addRecordComponent(Class<?> type, String name);

impl/src/main/java/org/jboss/forge/roaster/model/impl/AbstractInterfaceCapableJavaSource.java

@@ -0,0 +1,255 @@
+package org.jboss.forge.roaster.model.impl;
+
+import org.apache.commons.lang3.StringUtils;
+import org.eclipse.jdt.core.dom.AST;
+import org.eclipse.jdt.core.dom.AbstractTypeDeclaration;
+import org.eclipse.jdt.core.dom.BodyDeclaration;
+import org.eclipse.jdt.core.dom.CompilationUnit;
+import org.eclipse.jdt.core.dom.MethodDeclaration;
+import org.eclipse.jdt.core.dom.SimpleType;
+import org.eclipse.jdt.core.dom.Type;
+import org.eclipse.jface.text.Document;
+import org.jboss.forge.roaster.model.JavaInterface;
+import org.jboss.forge.roaster.model.Method;
+import org.jboss.forge.roaster.model.ast.MethodFinderVisitor;
+import org.jboss.forge.roaster.model.source.Import;
+import org.jboss.forge.roaster.model.source.InterfaceCapableSource;
+import org.jboss.forge.roaster.model.source.JavaInterfaceSource;
+import org.jboss.forge.roaster.model.source.JavaSource;
+import org.jboss.forge.roaster.model.source.MemberSource;
+import org.jboss.forge.roaster.model.source.MethodHolderSource;
+import org.jboss.forge.roaster.model.source.MethodSource;
+import org.jboss.forge.roaster.model.source.ParameterSource;
+import org.jboss.forge.roaster.model.util.Methods;
+import org.jboss.forge.roaster.model.util.Types;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+public abstract class AbstractInterfaceCapableJavaSource<O extends JavaSource<O>> extends AbstractJavaSource<O>
+         implements InterfaceCapableSource<O>, MethodHolderSource<O>
+{
+   protected AbstractInterfaceCapableJavaSource(JavaSource<?> enclosingType,
+            Document document, CompilationUnit unit,
+            BodyDeclaration body)
+   {
+      super(enclosingType, document, unit, body);
+   }
+
+   @Override
+   public List<String> getInterfaces()
+   {
+      List<String> result = new ArrayList<>();
+      List<Type> superTypes = JDTHelper.getInterfaces(getDeclaration());
+      for (Type type : superTypes)
+      {
+         String name = JDTHelper.getTypeName(type);
+         String rawName = Types.stripGenerics(name);
+         if (Types.isSimpleName(rawName))
+         {
+            String pkg;
+            Import imprt = getImport(rawName);
+            if (imprt == null)
+            {
+               imprt = getImport(resolveType(rawName));
+            }
+            if (imprt != null)
+            {
+               pkg = imprt.getPackage();
+            }
+            else
+            {
+               pkg = this.getPackage();
+            }
+            if (!StringUtils.isEmpty(pkg))
+            {
+               name = pkg + "." + name;
+            }
+         }
+         result.add(name);
+      }
+      return result;
+   }
+
+   @SuppressWarnings("unchecked")
+   @Override
+   public O addInterface(final String type)
+   {
+      if (!hasInterface(type))
+      {
+         String typeName;
+         if (addImport(type) != null)
+         {
+            typeName = Types.toSimpleName(type);
+         }
+         else
+         {
+            typeName = type;
+         }
+         AbstractTypeDeclaration declaration = getDeclaration();
+         AST ast = getDeclaration().getAST();
+         SimpleType simpleType = ast.newSimpleType(ast.newName(typeName));
+         JDTHelper.getInterfaces(declaration).add(simpleType);
+      }
+      return (O) this;
+   }
+
+   @Override
+   public O implementInterface(Class<?> type)
+   {
+      O obj = addInterface(type);
+      for (MethodSource<?> methodSource : Methods.implementAbstractMethods(type, this))
+      {
+         methodSource.setPublic().addAnnotation(Override.class);
+      }
+      return obj;
+   }
+
+   @Override
+   public O implementInterface(JavaInterface<?> type)
+   {
+      O obj = addInterface(type);
+
+      if (type instanceof JavaInterfaceSource)
+      {
+         Set<Import> usedImports = new HashSet<>();
+
+         JavaInterfaceSource interfaceSource = (JavaInterfaceSource) type;
+         for (MethodSource<JavaInterfaceSource> method : interfaceSource.getMethods())
+         {
+            if (method.isDefault())
+            {
+               // Do not add default implementations
+               continue;
+            }
+
+            if (!method.isReturnTypeVoid())
+            {
+               usedImports.add(interfaceSource.getImport(method.getReturnType().getQualifiedName()));
+            }
+
+            for (ParameterSource<JavaInterfaceSource> parameter : method.getParameters())
+            {
+               usedImports.add(interfaceSource.getImport(parameter.getType().getQualifiedName()));
+            }
+         }
+
+         for (Import imprt : interfaceSource.getImports())
+         {
+            if (usedImports.contains(imprt))
+            {
+               addImport(imprt);
+            }
+         }
+      }
+
+      for (MethodSource<?> methodSource : Methods.implementAbstractMethods(type, this))
+      {
+         methodSource.setPublic().addAnnotation(Override.class);
+      }
+      return obj;
+   }
+
+   @Override
+   public boolean hasInterface(final String type)
+   {
+      for (String name : getInterfaces())
+      {
+         if (Types.areEquivalent(name, type))
+         {
+            return true;
+         }
+      }
+      return false;
+   }
+
+   @SuppressWarnings("unchecked")
+   @Override
+   public O removeInterface(final String type)
+   {
+      List<Type> interfaces = JDTHelper.getInterfaces(getDeclaration());
+      for (Type i : interfaces)
+      {
+         if (Types.areEquivalent(i.toString(), type))
+         {
+            interfaces.remove(i);
+            break;
+         }
+      }
+      return (O) this;
+   }
+
+   @Override
+   @SuppressWarnings("unchecked")
+   public O removeMethod(final Method<O, ?> method)
+   {
+      getDeclaration().bodyDeclarations().remove(method.getInternal());
+      return (O) this;
+   }
+
+   @Override
+   @SuppressWarnings("unchecked")
+   public MethodSource<O> addMethod()
+   {
+      MethodSource<O> m = new MethodImpl<>((O) this);
+      getDeclaration().bodyDeclarations().add(m.getInternal());
+      return m;
+   }
+
+   @Override
+   @SuppressWarnings("unchecked")
+   public MethodSource<O> addMethod(final String method)
+   {
+      MethodSource<O> m = new MethodImpl<>((O) this, method);
+      getDeclaration().bodyDeclarations().add(m.getInternal());
+      return m;
+   }
+
+   @Override
+   @SuppressWarnings("unchecked")
+   public MethodSource<O> addMethod(java.lang.reflect.Method method)
+   {
+      MethodSource<O> m = new MethodImpl<>((O) this, method);
+      getDeclaration().bodyDeclarations().add(m.getInternal());
+      return m;
+   }
+
+   @Override
+   @SuppressWarnings("unchecked")
+   public MethodSource<O> addMethod(Method<?, ?> method)
+   {
+      MethodSource<O> m = new MethodImpl<>((O) this, method.toString());
+      getDeclaration().bodyDeclarations().add(m.getInternal());
+      return m;
+   }
+
+   @Override
+   @SuppressWarnings("unchecked")
+   public List<MethodSource<O>> getMethods()
+   {
+      List<MethodSource<O>> result = new ArrayList<>();
+
+      MethodFinderVisitor methodFinderVisitor = new MethodFinderVisitor();
+      body.accept(methodFinderVisitor);
+
+      List<MethodDeclaration> methods = methodFinderVisitor.getMethods();
+      for (MethodDeclaration methodDeclaration : methods)
+      {
+         result.add(new MethodImpl<>((O) this, methodDeclaration));
+      }
+      return Collections.unmodifiableList(result);
+   }
+
+   @Override
+   public List<MemberSource<O, ?>> getMembers()
+   {
+      List<MemberSource<O, ?>> result = new ArrayList<>();
+
+      result.addAll(getMethods());
+
+      return result;
+   }
+}