jdk8-mips64-public/langtools: test/tools/javac/lambdaShapes/org/openjdk/tests/separate/ClassToInterfaceConverter.java@2eb010b6cb22

     1 /*

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

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

     4  *

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

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

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

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

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

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

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

    15  * accompanied this code).

    16  *

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

    18  * 2 along with this work; if not, write to the Free Software Foundation,

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

    20  *

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

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

    23  * questions.

    24  */

    26 package org.openjdk.tests.separate;

    28 import java.io.*;

    29 import java.util.*;

    31 public class ClassToInterfaceConverter implements ClassFilePreprocessor {

    33     private String whichClass;

    35     public ClassToInterfaceConverter(String className) {

    36         this.whichClass = className;

    37     }

    39     private boolean utf8Matches(ClassFile.CpEntry entry, String v) {

    40         if (!(entry instanceof ClassFile.CpUtf8)) {

    41             return false;

    42         }

    43         ClassFile.CpUtf8 utf8 = (ClassFile.CpUtf8)entry;

    44         if (v.length() != utf8.bytes.length) {

    45             return false;

    46         }

    47         for (int i = 0; i < v.length(); ++i) {

    48             if (v.charAt(i) != utf8.bytes[i]) {

    49                 return false;

    50             }

    51         }

    52         return true;

    53     }

    55     private void convertToInterface(ClassFile cf) {

    56         cf.access_flags = 0x0601; // ACC_INTERFACE | ACC_ABSTRACT | ACC_PUBLIC

    57         ArrayList<ClassFile.Method> new_methods = new ArrayList<>();

    58         // Find <init> method and delete it

    59         for (int i = 0; i < cf.methods.size(); ++i) {

    60             ClassFile.Method method = cf.methods.get(i);

    61             ClassFile.CpEntry name = cf.constant_pool.get(method.name_index);

    62             if (!utf8Matches(name, "<init>")) {

    63                 new_methods.add(method);

    64             }

    65         }

    66         cf.methods = new_methods;

    67     }

    69     public byte[] preprocess(String classname, byte[] bytes) {

    70         ClassFile cf = new ClassFile(bytes);

    72         ClassFile.CpEntry entry = cf.constant_pool.get(cf.this_class);

    73         ClassFile.CpEntry name = cf.constant_pool.get(

    74             ((ClassFile.CpClass)entry).name_index);

    75         if (utf8Matches(name, whichClass)) {

    76             convertToInterface(cf);

    77             return cf.toByteArray();

    78         } else {

    79             return bytes; // unmodified

    80         }

    81     }

    83 /*

    84     public static void main(String argv[]) throws Exception {

    85         File input = new File(argv[0]);

    86         byte[] buffer = new byte[(int)input.length()];

    87         new FileInputStream(input).read(buffer);

    89         ClassFilePreprocessor cfp = new ClassToInterfaceConverter("Hello");

    90         byte[] cf = cfp.preprocess(argv[0], buffer);

    91         new FileOutputStream(argv[0] + ".mod").write(cf);

    92     }

    93 */

    94 }

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