/*******************************************************************************
 * Copyright (c) 2002 - 2006 IBM Corporation.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package com.ibm.wala.classLoader;

import java.io.InputStream;
import java.util.Collection;
import java.util.NoSuchElementException;

import com.ibm.wala.ipa.cha.IClassHierarchyDweller;
import com.ibm.wala.types.Selector;
import com.ibm.wala.types.TypeName;
import com.ibm.wala.types.TypeReference;
import com.ibm.wala.types.annotations.Annotation;
import com.ibm.wala.util.strings.Atom;

/**
 * Basic interface for an object that represents a single Java class for analysis purposes, including array classes.
 */
public interface IClass extends IClassHierarchyDweller {

  /**
   * Return the object that represents the defining class loader for this class.
   * 
   * @return the object that represents the defining class loader for this class.
   */
  IClassLoader getClassLoader();

  /**
   * Is this class a Java interface?
   */
  boolean isInterface();

  /**
   * @return true iff this class is abstract
   */
  boolean isAbstract();

  /**
   * @return true iff this class is public
   */
  boolean isPublic();
  
  /**
   * @return true iff this class is private
   */
  boolean isPrivate();

  /**
   * Return the integer that encodes the class's modifiers, as defined by the JVM specification
   * 
   * @return the integer that encodes the class's modifiers, as defined by the JVM specification
   */
  int getModifiers() throws UnsupportedOperationException;

  /**
   * @return the superclass, or null if java.lang.Object
   * @throws IllegalStateException if there's some problem determining the superclass
   */
  IClass getSuperclass();

  /**
   * @return Collection of (IClass) interfaces this class directly implements. If this class is an interface, returns the interfaces
   *         it immediately extends.
   */
  Collection<? extends IClass> getDirectInterfaces();

  /**
   * @return Collection of (IClass) interfaces this class implements, including all ancestors of interfaces immediately implemented.
   *         If this class is an interface, it returns all super-interfaces.
   */
  Collection<IClass> getAllImplementedInterfaces();

  /**
   * Finds method matching signature. Delegates to superclass if not found.
   * 
   * @param selector a method signature
   * @return IMethod from this class matching the signature; null if not found in this class or any superclass.
   */
  IMethod getMethod(Selector selector);

  /**
   * Finds a field.
   * 
   * @throws IllegalStateException if the class contains multiple fields with name <code>name</code>.
   */
  IField getField(Atom name);

  /**
   * Finds a field, given a name and a type.  Returns <code>null</code> if not found.
   */
  IField getField(Atom name, TypeName type);
  
  /**
   * @return canonical TypeReference corresponding to this class
   */
  TypeReference getReference();

  /**
   * @return String holding the name of the source file that defined this class, or null if none found
   * @throws NoSuchElementException if this class was generated from more than one source file
   * The assumption that a class is generated from a single source file is java
   * specific, and will change in the future.  In place of this API, use the APIs in IClassLoader.  
   * SJF .. we should think about this deprecation.  postponing deprecation for now.  
   */
  String getSourceFileName() throws NoSuchElementException;

  /**
   * @return String representing the source file holding this class, or null if not found
   * @throws NoSuchElementException if this class was generated from more than one source file
   * The assumption that a class is generated from a single source file is java
   * specific, and will change in the future.   In place of this API, use the APIs in IClassLoader.  
   * SJF .. we should think about this deprecation.  postponing deprecation for now.    
   */
  InputStream getSource() throws NoSuchElementException;

  /**
   * @return the method that is this class's initializer, or null if none
   */
  IMethod getClassInitializer();

  /**
   * @return true iff the class is an array class.
   */
  boolean isArrayClass();

  /**
   * @return an Iterator of the IMethods declared by this class.
   */
  Collection<IMethod> getDeclaredMethods();

  /**
   * Compute the instance fields declared by this class or any of its superclasses.
   */
  Collection<IField> getAllInstanceFields();

  /**
   * Compute the static fields declared by this class or any of its superclasses.
   */
  Collection<IField> getAllStaticFields();

  /**
   * Compute the instance and static fields declared by this class or any of its superclasses.
   */
  Collection<IField> getAllFields();

  /**
   * Compute the methods declared by this class or any of its superclasses.
   */
  Collection<IMethod> getAllMethods();

  /**
   * Compute the instance fields declared by this class.
   * 
   * @return Collection of IFields
   */
  Collection<IField> getDeclaredInstanceFields();

  /**
   * @return Collection of IField
   */
  Collection<IField> getDeclaredStaticFields();

  /**
   * @return the TypeName for this class
   */
  TypeName getName();

  /**
   * Does 'this' refer to a reference type? If not, then it refers to a primitive type.
   */
  boolean isReferenceType();

  /**
   * get annotations, if any
   */
  Collection<Annotation> getAnnotations();
  
}
