/*

 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

import java.net.URI;

import java.net.URISyntaxException;

import java.util.Arrays;

import javax.tools.DiagnosticCollector;

import javax.tools.JavaCompiler;

import javax.tools.JavaFileObject;

import javax.tools.SimpleJavaFileObject;

import javax.tools.ToolProvider;

import javax.tools.JavaCompiler.CompilationTask;

public class Helper {

    enum ContentVars {

        IMPORTCONTAINERSTMTS("\nimport java.lang.annotation.ContainedBy;\n" +

                            "\nimport java.lang.annotation.ContainerFor;\n"),

        IMPORTDEPRECATED("import java.lang.Deprecated;\n"),

        IMPORTDOCUMENTED("import java.lang.annotation.Documented;\n"),

        IMPORTINHERITED("import java.lang.annotation.Inherited;\n"),

        IMPORTRETENTION("import java.lang.annotation.Retention;\n" +

                        "\nimport java.lang.annotation.RetentionPolicy;\n"),

        CONTAINEDBY("\n@ContainedBy(FooContainer.class)\n"),

        CONTAINERFOR("@ContainerFor(Foo.class)\n"),

        CONTAINER("@interface FooContainer {\n" +"  Foo[] value();\n}\n"),

        BASE("@interface Foo {}\n"),

        REPEATABLEANNO("\n@Foo() @Foo()"),

        DEPRECATED("\n@Deprecated"),

        DOCUMENTED("\n@Documented"),

        INHERITED("\n@Inherited"),

        RETENTION("@Retention(RetentionPolicy.#VAL)\n");

        private String val;

        private ContentVars(String val) {

            this.val = val;

        }

        public String getVal() {

            return val;

        }

    }

    /* String template where /*<TYPE>*/ /*gets replaced by repeating anno

     * Used to generate test src for combo tests

     *   - BasicSyntaxCombo.java

     *   - TargetAnnoCombo.java

     */

    public static final String template =

            "/*PACKAGE*/\n" +

            "//pkg test;\n\n" +

            "/*TYPE*/ //class\n" +

            "class #ClassName {\n" +

            "  /*FIELD*/ //instance var\n" +

            "  public int x = 0;\n\n" +

            "  /*FIELD*/ //Enum constants\n" +

            "  TestEnum testEnum;\n\n" +

            "  /*FIELD*/ // Static field\n" +

            "  public static int num;\n\n" +

            "  /*STATIC_INI*/\n" +

            "  static { \n" + "num = 10; \n  }\n\n" +

            "  /*CONSTRUCTOR*/\n" +

            "  #ClassName() {}\n\n" +

            "  /*INSTANCE_INI*/\n" +

            "  { \n x = 10; \n }" +

            "  /*INNER_CLASS*/\n" +

            "  class innerClass {}\n" +

            "  /*METHOD*/\n" +

            "  void bar(/*PARAMETER*/ int baz) {\n" +

            "    /*LOCAL_VARIABLE*/\n" +

            "    int y = 0;\n" +

            "  }\n" +

            "}\n\n" +

            "/*TYPE*/ //Enum\n" +

            "enum TestEnum {}\n\n" +

            "/*TYPE*/ //Interface\n" +

            "interface TestInterface {}\n\n" +

            "/*TYPE*/\n" +

            "/*ANNOTATION_TYPE*/\n" +

            "@interface TestAnnotationType{}\n";

    // Create and compile FileObject using values for className and contents

    public static boolean compileCode(String className, String contents,

            DiagnosticCollector<JavaFileObject> diagnostics) {

        boolean ok = false;

        JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();

        if (compiler == null) {

            throw new RuntimeException("can't get javax.tools.JavaCompiler!");

        }

        JavaFileObject file = getFile(className, contents);

        Iterable<? extends JavaFileObject> compilationUnit = Arrays.asList(file);

        CompilationTask task = compiler.getTask(null, null, diagnostics, null, null, compilationUnit);

        ok = task.call();

        return ok;

    }

    // Compile a list of FileObjects

    public static boolean compileCode(DiagnosticCollector<JavaFileObject> diagnostics, Iterable<? extends JavaFileObject> files) {

        JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();

        if (compiler == null) {

            throw new RuntimeException("can't get javax.tools.JavaCompiler!");

        }

        CompilationTask task = compiler.getTask(null, null, diagnostics, null, null, files);

        boolean ok = task.call();

        return ok;

    }

    static JavaFileObject getFile(String name, String code) {

        JavaFileObject o = null;

        try {

            o = new JavaStringFileObject(name, code);

        } catch (URISyntaxException e) {

            throw new RuntimeException(e);

        }

        return o;

    }

    static class JavaStringFileObject extends SimpleJavaFileObject {

        final String theCode;

        public JavaStringFileObject(String fileName, String theCode) throws URISyntaxException {

            super(new URI("string:///" + fileName.replace('.','/') + ".java"), Kind.SOURCE);

            this.theCode = theCode;

        }

        @Override

        public CharSequence getCharContent(boolean ignoreEncodingErrors) {

            return theCode;

        }

    }

}