aoqi@0: /*
aoqi@0:  * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.  Oracle designates this
aoqi@0:  * particular file as subject to the "Classpath" exception as provided
aoqi@0:  * by Oracle in the LICENSE file that accompanied this code.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  */
aoqi@0: 
aoqi@0: package com.sun.tools.javac.processing;
aoqi@0: 
aoqi@0: import javax.annotation.processing.*;
aoqi@0: import javax.lang.model.*;
aoqi@0: import javax.lang.model.element.*;
aoqi@0: import static javax.lang.model.element.ElementKind.*;
aoqi@0: import static javax.lang.model.element.NestingKind.*;
aoqi@0: import javax.lang.model.type.*;
aoqi@0: import javax.lang.model.util.*;
aoqi@0: 
aoqi@0: import java.io.PrintWriter;
aoqi@0: import java.io.Writer;
aoqi@0: import java.util.*;
aoqi@0: import com.sun.tools.javac.util.StringUtils;
aoqi@0: 
aoqi@0: /**
aoqi@0:  * A processor which prints out elements.  Used to implement the
aoqi@0:  * -Xprint option; the included visitor class is used to implement
aoqi@0:  * Elements.printElements.
aoqi@0:  *
aoqi@0:  * <p><b>This is NOT part of any supported API.
aoqi@0:  * If you write code that depends on this, you do so at your own risk.
aoqi@0:  * This code and its internal interfaces are subject to change or
aoqi@0:  * deletion without notice.</b>
aoqi@0:  */
aoqi@0: @SupportedAnnotationTypes("*")
aoqi@0: @SupportedSourceVersion(SourceVersion.RELEASE_8)
aoqi@0: public class PrintingProcessor extends AbstractProcessor {
aoqi@0:     PrintWriter writer;
aoqi@0: 
aoqi@0:     public PrintingProcessor() {
aoqi@0:         super();
aoqi@0:         writer = new PrintWriter(System.out);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void setWriter(Writer w) {
aoqi@0:         writer = new PrintWriter(w);
aoqi@0:     }
aoqi@0: 
aoqi@0:     @Override
aoqi@0:     public boolean process(Set<? extends TypeElement> tes,
aoqi@0:                            RoundEnvironment renv) {
aoqi@0: 
aoqi@0:         for(Element element : renv.getRootElements()) {
aoqi@0:             print(element);
aoqi@0:         }
aoqi@0: 
aoqi@0:         // Just print the elements, nothing more to do.
aoqi@0:         return true;
aoqi@0:     }
aoqi@0: 
aoqi@0:     void print(Element element) {
aoqi@0:         new PrintingElementVisitor(writer, processingEnv.getElementUtils()).
aoqi@0:             visit(element).flush();
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Used for the -Xprint option and called by Elements.printElements
aoqi@0:      */
aoqi@0:     public static class PrintingElementVisitor
aoqi@0:         extends SimpleElementVisitor8<PrintingElementVisitor, Boolean> {
aoqi@0:         int indentation; // Indentation level;
aoqi@0:         final PrintWriter writer;
aoqi@0:         final Elements elementUtils;
aoqi@0: 
aoqi@0:         public PrintingElementVisitor(Writer w, Elements elementUtils) {
aoqi@0:             super();
aoqi@0:             this.writer = new PrintWriter(w);
aoqi@0:             this.elementUtils = elementUtils;
aoqi@0:             indentation = 0;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         protected PrintingElementVisitor defaultAction(Element e, Boolean newLine) {
aoqi@0:             if (newLine != null && newLine)
aoqi@0:                 writer.println();
aoqi@0:             printDocComment(e);
aoqi@0:             printModifiers(e);
aoqi@0:             return this;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public PrintingElementVisitor visitExecutable(ExecutableElement e, Boolean p) {
aoqi@0:             ElementKind kind = e.getKind();
aoqi@0: 
aoqi@0:             if (kind != STATIC_INIT &&
aoqi@0:                 kind != INSTANCE_INIT) {
aoqi@0:                 Element enclosing = e.getEnclosingElement();
aoqi@0: 
aoqi@0:                 // Don't print out the constructor of an anonymous class
aoqi@0:                 if (kind == CONSTRUCTOR &&
aoqi@0:                     enclosing != null &&
aoqi@0:                     NestingKind.ANONYMOUS ==
aoqi@0:                     // Use an anonymous class to determine anonymity!
aoqi@0:                     (new SimpleElementVisitor7<NestingKind, Void>() {
aoqi@0:                         @Override
aoqi@0:                         public NestingKind visitType(TypeElement e, Void p) {
aoqi@0:                             return e.getNestingKind();
aoqi@0:                         }
aoqi@0:                     }).visit(enclosing))
aoqi@0:                     return this;
aoqi@0: 
aoqi@0:                 defaultAction(e, true);
aoqi@0:                 printFormalTypeParameters(e, true);
aoqi@0: 
aoqi@0:                 switch(kind) {
aoqi@0:                     case CONSTRUCTOR:
aoqi@0:                     // Print out simple name of the class
aoqi@0:                     writer.print(e.getEnclosingElement().getSimpleName());
aoqi@0:                     break;
aoqi@0: 
aoqi@0:                     case METHOD:
aoqi@0:                     writer.print(e.getReturnType().toString());
aoqi@0:                     writer.print(" ");
aoqi@0:                     writer.print(e.getSimpleName().toString());
aoqi@0:                     break;
aoqi@0:                 }
aoqi@0: 
aoqi@0:                 writer.print("(");
aoqi@0:                 printParameters(e);
aoqi@0:                 writer.print(")");
aoqi@0:                 AnnotationValue defaultValue = e.getDefaultValue();
aoqi@0:                 if (defaultValue != null)
aoqi@0:                     writer.print(" default " + defaultValue);
aoqi@0: 
aoqi@0:                 printThrows(e);
aoqi@0:                 writer.println(";");
aoqi@0:             }
aoqi@0:             return this;
aoqi@0:         }
aoqi@0: 
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public PrintingElementVisitor visitType(TypeElement e, Boolean p) {
aoqi@0:             ElementKind kind = e.getKind();
aoqi@0:             NestingKind nestingKind = e.getNestingKind();
aoqi@0: 
aoqi@0:             if (NestingKind.ANONYMOUS == nestingKind) {
aoqi@0:                 // Print out an anonymous class in the style of a
aoqi@0:                 // class instance creation expression rather than a
aoqi@0:                 // class declaration.
aoqi@0:                 writer.print("new ");
aoqi@0: 
aoqi@0:                 // If the anonymous class implements an interface
aoqi@0:                 // print that name, otherwise print the superclass.
aoqi@0:                 List<? extends TypeMirror> interfaces = e.getInterfaces();
aoqi@0:                 if (!interfaces.isEmpty())
aoqi@0:                     writer.print(interfaces.get(0));
aoqi@0:                 else
aoqi@0:                     writer.print(e.getSuperclass());
aoqi@0: 
aoqi@0:                 writer.print("(");
aoqi@0:                 // Anonymous classes that implement an interface can't
aoqi@0:                 // have any constructor arguments.
aoqi@0:                 if (interfaces.isEmpty()) {
aoqi@0:                     // Print out the parameter list from the sole
aoqi@0:                     // constructor.  For now, don't try to elide any
aoqi@0:                     // synthetic parameters by determining if the
aoqi@0:                     // anonymous class is in a static context, etc.
aoqi@0:                     List<? extends ExecutableElement> constructors =
aoqi@0:                         ElementFilter.constructorsIn(e.getEnclosedElements());
aoqi@0: 
aoqi@0:                     if (!constructors.isEmpty())
aoqi@0:                         printParameters(constructors.get(0));
aoqi@0:                 }
aoqi@0:                 writer.print(")");
aoqi@0:             } else {
aoqi@0:                 if (nestingKind == TOP_LEVEL) {
aoqi@0:                     PackageElement pkg = elementUtils.getPackageOf(e);
aoqi@0:                     if (!pkg.isUnnamed())
aoqi@0:                         writer.print("package " + pkg.getQualifiedName() + ";\n");
aoqi@0:                 }
aoqi@0: 
aoqi@0:                 defaultAction(e, true);
aoqi@0: 
aoqi@0:                 switch(kind) {
aoqi@0:                 case ANNOTATION_TYPE:
aoqi@0:                     writer.print("@interface");
aoqi@0:                     break;
aoqi@0:                 default:
aoqi@0:                     writer.print(StringUtils.toLowerCase(kind.toString()));
aoqi@0:                 }
aoqi@0:                 writer.print(" ");
aoqi@0:                 writer.print(e.getSimpleName());
aoqi@0: 
aoqi@0:                 printFormalTypeParameters(e, false);
aoqi@0: 
aoqi@0:                 // Print superclass information if informative
aoqi@0:                 if (kind == CLASS) {
aoqi@0:                     TypeMirror supertype = e.getSuperclass();
aoqi@0:                     if (supertype.getKind() != TypeKind.NONE) {
aoqi@0:                         TypeElement e2 = (TypeElement)
aoqi@0:                             ((DeclaredType) supertype).asElement();
aoqi@0:                         if (e2.getSuperclass().getKind() != TypeKind.NONE)
aoqi@0:                             writer.print(" extends " + supertype);
aoqi@0:                     }
aoqi@0:                 }
aoqi@0: 
aoqi@0:                 printInterfaces(e);
aoqi@0:             }
aoqi@0:             writer.println(" {");
aoqi@0:             indentation++;
aoqi@0: 
aoqi@0:             if (kind == ENUM) {
aoqi@0:                 List<Element> enclosedElements =
aoqi@0:                     new ArrayList<Element>(e.getEnclosedElements());
aoqi@0:                 // Handle any enum constants specially before other entities.
aoqi@0:                 List<Element> enumConstants = new ArrayList<Element>();
aoqi@0:                 for(Element element : enclosedElements) {
aoqi@0:                     if (element.getKind() == ENUM_CONSTANT)
aoqi@0:                         enumConstants.add(element);
aoqi@0:                 }
aoqi@0:                 if (!enumConstants.isEmpty()) {
aoqi@0:                     int i;
aoqi@0:                     for(i = 0; i < enumConstants.size()-1; i++) {
aoqi@0:                         this.visit(enumConstants.get(i), true);
aoqi@0:                         writer.print(",");
aoqi@0:                     }
aoqi@0:                     this.visit(enumConstants.get(i), true);
aoqi@0:                     writer.println(";\n");
aoqi@0: 
aoqi@0:                     enclosedElements.removeAll(enumConstants);
aoqi@0:                 }
aoqi@0: 
aoqi@0:                 for(Element element : enclosedElements)
aoqi@0:                     this.visit(element);
aoqi@0:             } else {
aoqi@0:                 for(Element element : e.getEnclosedElements())
aoqi@0:                     this.visit(element);
aoqi@0:             }
aoqi@0: 
aoqi@0:             indentation--;
aoqi@0:             indent();
aoqi@0:             writer.println("}");
aoqi@0:             return this;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public PrintingElementVisitor visitVariable(VariableElement e, Boolean newLine) {
aoqi@0:             ElementKind kind = e.getKind();
aoqi@0:             defaultAction(e, newLine);
aoqi@0: 
aoqi@0:             if (kind == ENUM_CONSTANT)
aoqi@0:                 writer.print(e.getSimpleName());
aoqi@0:             else {
aoqi@0:                 writer.print(e.asType().toString() + " " + e.getSimpleName() );
aoqi@0:                 Object constantValue  = e.getConstantValue();
aoqi@0:                 if (constantValue != null) {
aoqi@0:                     writer.print(" = ");
aoqi@0:                     writer.print(elementUtils.getConstantExpression(constantValue));
aoqi@0:                 }
aoqi@0:                 writer.println(";");
aoqi@0:             }
aoqi@0:             return this;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public PrintingElementVisitor visitTypeParameter(TypeParameterElement e, Boolean p) {
aoqi@0:             writer.print(e.getSimpleName());
aoqi@0:             return this;
aoqi@0:         }
aoqi@0: 
aoqi@0:         // Should we do more here?
aoqi@0:         @Override
aoqi@0:         public PrintingElementVisitor visitPackage(PackageElement e, Boolean p) {
aoqi@0:             defaultAction(e, false);
aoqi@0:             if (!e.isUnnamed())
aoqi@0:                 writer.println("package " + e.getQualifiedName() + ";");
aoqi@0:             else
aoqi@0:                 writer.println("// Unnamed package");
aoqi@0:             return this;
aoqi@0:         }
aoqi@0: 
aoqi@0:         public void flush() {
aoqi@0:             writer.flush();
aoqi@0:         }
aoqi@0: 
aoqi@0:         private void printDocComment(Element e) {
aoqi@0:             String docComment = elementUtils.getDocComment(e);
aoqi@0: 
aoqi@0:             if (docComment != null) {
aoqi@0:                 // Break comment into lines
aoqi@0:                 java.util.StringTokenizer st = new StringTokenizer(docComment,
aoqi@0:                                                                   "\n\r");
aoqi@0:                 indent();
aoqi@0:                 writer.println("/**");
aoqi@0: 
aoqi@0:                 while(st.hasMoreTokens()) {
aoqi@0:                     indent();
aoqi@0:                     writer.print(" *");
aoqi@0:                     writer.println(st.nextToken());
aoqi@0:                 }
aoqi@0: 
aoqi@0:                 indent();
aoqi@0:                 writer.println(" */");
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         private void printModifiers(Element e) {
aoqi@0:             ElementKind kind = e.getKind();
aoqi@0:             if (kind == PARAMETER) {
aoqi@0:                 printAnnotationsInline(e);
aoqi@0:             } else {
aoqi@0:                 printAnnotations(e);
aoqi@0:                 indent();
aoqi@0:             }
aoqi@0: 
aoqi@0:             if (kind == ENUM_CONSTANT)
aoqi@0:                 return;
aoqi@0: 
aoqi@0:             Set<Modifier> modifiers = new LinkedHashSet<Modifier>();
aoqi@0:             modifiers.addAll(e.getModifiers());
aoqi@0: 
aoqi@0:             switch (kind) {
aoqi@0:             case ANNOTATION_TYPE:
aoqi@0:             case INTERFACE:
aoqi@0:                 modifiers.remove(Modifier.ABSTRACT);
aoqi@0:                 break;
aoqi@0: 
aoqi@0:             case ENUM:
aoqi@0:                 modifiers.remove(Modifier.FINAL);
aoqi@0:                 modifiers.remove(Modifier.ABSTRACT);
aoqi@0:                 break;
aoqi@0: 
aoqi@0:             case METHOD:
aoqi@0:             case FIELD:
aoqi@0:                 Element enclosingElement = e.getEnclosingElement();
aoqi@0:                 if (enclosingElement != null &&
aoqi@0:                     enclosingElement.getKind().isInterface()) {
aoqi@0:                     modifiers.remove(Modifier.PUBLIC);
aoqi@0:                     modifiers.remove(Modifier.ABSTRACT); // only for methods
aoqi@0:                     modifiers.remove(Modifier.STATIC);   // only for fields
aoqi@0:                     modifiers.remove(Modifier.FINAL);    // only for fields
aoqi@0:                 }
aoqi@0:                 break;
aoqi@0: 
aoqi@0:             }
aoqi@0: 
aoqi@0:             for(Modifier m: modifiers) {
aoqi@0:                 writer.print(m.toString() + " ");
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         private void printFormalTypeParameters(Parameterizable e,
aoqi@0:                                                boolean pad) {
aoqi@0:             List<? extends TypeParameterElement> typeParams = e.getTypeParameters();
aoqi@0:             if (typeParams.size() > 0) {
aoqi@0:                 writer.print("<");
aoqi@0: 
aoqi@0:                 boolean first = true;
aoqi@0:                 for(TypeParameterElement tpe: typeParams) {
aoqi@0:                     if (!first)
aoqi@0:                         writer.print(", ");
aoqi@0:                     printAnnotationsInline(tpe);
aoqi@0:                     writer.print(tpe.toString());
aoqi@0:                     first = false;
aoqi@0:                 }
aoqi@0: 
aoqi@0:                 writer.print(">");
aoqi@0:                 if (pad)
aoqi@0:                     writer.print(" ");
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         private void printAnnotationsInline(Element e) {
aoqi@0:             List<? extends AnnotationMirror> annots = e.getAnnotationMirrors();
aoqi@0:             for(AnnotationMirror annotationMirror : annots) {
aoqi@0:                 writer.print(annotationMirror);
aoqi@0:                 writer.print(" ");
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         private void printAnnotations(Element e) {
aoqi@0:             List<? extends AnnotationMirror> annots = e.getAnnotationMirrors();
aoqi@0:             for(AnnotationMirror annotationMirror : annots) {
aoqi@0:                 indent();
aoqi@0:                 writer.println(annotationMirror);
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         // TODO: Refactor
aoqi@0:         private void printParameters(ExecutableElement e) {
aoqi@0:             List<? extends VariableElement> parameters = e.getParameters();
aoqi@0:             int size = parameters.size();
aoqi@0: 
aoqi@0:             switch (size) {
aoqi@0:             case 0:
aoqi@0:                 break;
aoqi@0: 
aoqi@0:             case 1:
aoqi@0:                 for(VariableElement parameter: parameters) {
aoqi@0:                     printModifiers(parameter);
aoqi@0: 
aoqi@0:                     if (e.isVarArgs() ) {
aoqi@0:                         TypeMirror tm = parameter.asType();
aoqi@0:                         if (tm.getKind() != TypeKind.ARRAY)
aoqi@0:                             throw new AssertionError("Var-args parameter is not an array type: " + tm);
aoqi@0:                         writer.print((ArrayType.class.cast(tm)).getComponentType() );
aoqi@0:                         writer.print("...");
aoqi@0:                     } else
aoqi@0:                         writer.print(parameter.asType());
aoqi@0:                     writer.print(" " + parameter.getSimpleName());
aoqi@0:                 }
aoqi@0:                 break;
aoqi@0: 
aoqi@0:             default:
aoqi@0:                 {
aoqi@0:                     int i = 1;
aoqi@0:                     for(VariableElement parameter: parameters) {
aoqi@0:                         if (i == 2)
aoqi@0:                             indentation++;
aoqi@0: 
aoqi@0:                         if (i > 1)
aoqi@0:                             indent();
aoqi@0: 
aoqi@0:                         printModifiers(parameter);
aoqi@0: 
aoqi@0:                         if (i == size && e.isVarArgs() ) {
aoqi@0:                             TypeMirror tm = parameter.asType();
aoqi@0:                             if (tm.getKind() != TypeKind.ARRAY)
aoqi@0:                                 throw new AssertionError("Var-args parameter is not an array type: " + tm);
aoqi@0:                                     writer.print((ArrayType.class.cast(tm)).getComponentType() );
aoqi@0: 
aoqi@0:                             writer.print("...");
aoqi@0:                         } else
aoqi@0:                             writer.print(parameter.asType());
aoqi@0:                         writer.print(" " + parameter.getSimpleName());
aoqi@0: 
aoqi@0:                         if (i < size)
aoqi@0:                             writer.println(",");
aoqi@0: 
aoqi@0:                         i++;
aoqi@0:                     }
aoqi@0: 
aoqi@0:                     if (parameters.size() >= 2)
aoqi@0:                         indentation--;
aoqi@0:                 }
aoqi@0:                 break;
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         private void printInterfaces(TypeElement e) {
aoqi@0:             ElementKind kind = e.getKind();
aoqi@0: 
aoqi@0:             if(kind != ANNOTATION_TYPE) {
aoqi@0:                 List<? extends TypeMirror> interfaces = e.getInterfaces();
aoqi@0:                 if (interfaces.size() > 0) {
aoqi@0:                     writer.print((kind.isClass() ? " implements" : " extends"));
aoqi@0: 
aoqi@0:                     boolean first = true;
aoqi@0:                     for(TypeMirror interf: interfaces) {
aoqi@0:                         if (!first)
aoqi@0:                             writer.print(",");
aoqi@0:                         writer.print(" ");
aoqi@0:                         writer.print(interf.toString());
aoqi@0:                         first = false;
aoqi@0:                     }
aoqi@0:                 }
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         private void printThrows(ExecutableElement e) {
aoqi@0:             List<? extends TypeMirror> thrownTypes = e.getThrownTypes();
aoqi@0:             final int size = thrownTypes.size();
aoqi@0:             if (size != 0) {
aoqi@0:                 writer.print(" throws");
aoqi@0: 
aoqi@0:                 int i = 1;
aoqi@0:                 for(TypeMirror thrownType: thrownTypes) {
aoqi@0:                     if (i == 1)
aoqi@0:                         writer.print(" ");
aoqi@0: 
aoqi@0:                     if (i == 2)
aoqi@0:                         indentation++;
aoqi@0: 
aoqi@0:                     if (i >= 2)
aoqi@0:                         indent();
aoqi@0: 
aoqi@0:                     writer.print(thrownType);
aoqi@0: 
aoqi@0:                     if (i != size)
aoqi@0:                         writer.println(", ");
aoqi@0: 
aoqi@0:                     i++;
aoqi@0:                 }
aoqi@0: 
aoqi@0:                 if (size >= 2)
aoqi@0:                     indentation--;
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         private static final String [] spaces = {
aoqi@0:             "",
aoqi@0:             "  ",
aoqi@0:             "    ",
aoqi@0:             "      ",
aoqi@0:             "        ",
aoqi@0:             "          ",
aoqi@0:             "            ",
aoqi@0:             "              ",
aoqi@0:             "                ",
aoqi@0:             "                  ",
aoqi@0:             "                    "
aoqi@0:         };
aoqi@0: 
aoqi@0:         private void indent() {
aoqi@0:             int indentation = this.indentation;
aoqi@0:             if (indentation < 0)
aoqi@0:                 return;
aoqi@0:             final int maxIndex = spaces.length - 1;
aoqi@0: 
aoqi@0:             while (indentation > maxIndex) {
aoqi@0:                 writer.print(spaces[maxIndex]);
aoqi@0:                 indentation -= maxIndex;
aoqi@0:             }
aoqi@0:             writer.print(spaces[indentation]);
aoqi@0:         }
aoqi@0: 
aoqi@0:     }
aoqi@0: }