1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "com_android_tools_aapt2_Aapt2Jni.h"
18
19#include <algorithm>
20#include <memory>
21#include <utility>
22#include <vector>
23
24#include "android-base/logging.h"
25#include "ScopedUtfChars.h"
26
27#include "Diagnostics.h"
28#include "util/Util.h"
29
30using android::StringPiece;
31
32namespace aapt {
33extern int Compile(const std::vector<StringPiece>& args, IDiagnostics* iDiagnostics);
34extern int Link(const std::vector<StringPiece>& args, IDiagnostics* iDiagnostics);
35}
36
37/*
38 * Converts a java List<String> into C++ vector<ScopedUtfChars>.
39 */
40static std::vector<ScopedUtfChars> list_to_utfchars(JNIEnv *env, jobject obj) {
41  std::vector<ScopedUtfChars> converted;
42
43  // Call size() method on the list to know how many elements there are.
44  jclass list_cls = env->GetObjectClass(obj);
45  jmethodID size_method_id = env->GetMethodID(list_cls, "size", "()I");
46  CHECK(size_method_id != 0);
47  jint size = env->CallIntMethod(obj, size_method_id);
48  CHECK(size >= 0);
49
50  // Now, iterate all strings in the list
51  // (note: generic erasure means get() return an Object)
52  jmethodID get_method_id = env->GetMethodID(list_cls, "get", "(I)Ljava/lang/Object;");
53  CHECK(get_method_id != 0);
54  for (jint i = 0; i < size; i++) {
55    // Call get(i) to get the string in the ith position.
56    jobject string_obj_uncast = env->CallObjectMethod(obj, get_method_id, i);
57    CHECK(string_obj_uncast != nullptr);
58    jstring string_obj = static_cast<jstring>(string_obj_uncast);
59    converted.push_back(ScopedUtfChars(env, string_obj));
60  }
61
62  return converted;
63}
64
65/*
66 * Extracts all StringPiece from the ScopedUtfChars instances.
67 *
68 * The returned pieces can only be used while the original ones have not been
69 * destroyed.
70 */
71static std::vector<StringPiece> extract_pieces(const std::vector<ScopedUtfChars> &strings) {
72  std::vector<StringPiece> pieces;
73
74  std::for_each(
75      strings.begin(), strings.end(),
76      [&pieces](const ScopedUtfChars &p) { pieces.push_back(p.c_str()); });
77
78  return pieces;
79}
80
81class JniDiagnostics : public aapt::IDiagnostics {
82 public:
83  JniDiagnostics(JNIEnv* env, jobject diagnostics_obj)
84      : env_(env), diagnostics_obj_(diagnostics_obj) {
85    mid_ = NULL;
86  }
87
88  void Log(Level level, aapt::DiagMessageActual& actual_msg) override {
89    jint level_value;
90    switch (level) {
91      case Level::Error:
92        level_value = 3;
93        break;
94
95      case Level::Warn:
96        level_value = 2;
97        break;
98
99      case Level::Note:
100        level_value = 1;
101        break;
102    }
103    jstring message = env_->NewStringUTF(actual_msg.message.c_str());
104    jstring path = env_->NewStringUTF(actual_msg.source.path.c_str());
105    jlong line = -1;
106    if (actual_msg.source.line) {
107      line = actual_msg.source.line.value();
108    }
109    if (!mid_) {
110      jclass diagnostics_cls = env_->GetObjectClass(diagnostics_obj_);
111      mid_ = env_->GetMethodID(diagnostics_cls, "log", "(ILjava/lang/String;JLjava/lang/String;)V");
112    }
113    env_->CallVoidMethod(diagnostics_obj_, mid_, level_value, path, line, message);
114  }
115
116 private:
117  JNIEnv* env_;
118  jobject diagnostics_obj_;
119  jmethodID mid_;
120  DISALLOW_COPY_AND_ASSIGN(JniDiagnostics);
121};
122
123JNIEXPORT jint JNICALL Java_com_android_tools_aapt2_Aapt2Jni_nativeCompile(
124    JNIEnv* env, jclass aapt_obj, jobject arguments_obj, jobject diagnostics_obj) {
125  std::vector<ScopedUtfChars> compile_args_jni =
126      list_to_utfchars(env, arguments_obj);
127  std::vector<StringPiece> compile_args = extract_pieces(compile_args_jni);
128  JniDiagnostics diagnostics(env, diagnostics_obj);
129  return aapt::Compile(compile_args, &diagnostics);
130}
131
132JNIEXPORT jint JNICALL Java_com_android_tools_aapt2_Aapt2Jni_nativeLink(JNIEnv* env,
133                                                                        jclass aapt_obj,
134                                                                        jobject arguments_obj,
135                                                                        jobject diagnostics_obj) {
136  std::vector<ScopedUtfChars> link_args_jni =
137      list_to_utfchars(env, arguments_obj);
138  std::vector<StringPiece> link_args = extract_pieces(link_args_jni);
139  JniDiagnostics diagnostics(env, diagnostics_obj);
140  return aapt::Link(link_args, &diagnostics);
141}
142
143JNIEXPORT void JNICALL Java_com_android_tools_aapt2_Aapt2Jni_ping(
144        JNIEnv *env, jclass aapt_obj) {
145  // This is just a dummy method to see if the library has been loaded.
146}
147