LibreOffice Module bridges (master)  1
JNI_proxy.java
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1 // -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2 /*
3  * This file is part of the LibreOffice project.
4  *
5  * This Source Code Form is subject to the terms of the Mozilla Public
6  * License, v. 2.0. If a copy of the MPL was not distributed with this
7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
8  *
9  * This file incorporates work covered by the following license notice:
10  *
11  * Licensed to the Apache Software Foundation (ASF) under one or more
12  * contributor license agreements. See the NOTICE file distributed
13  * with this work for additional information regarding copyright
14  * ownership. The ASF licenses this file to you under the Apache
15  * License, Version 2.0 (the "License"); you may not use this file
16  * except in compliance with the License. You may obtain a copy of
17  * the License at http://www.apache.org/licenses/LICENSE-2.0 .
18  */
19 
20 package com.sun.star.bridges.jni_uno;
21 
22 import com.sun.star.lib.util.AsynchronousFinalizer;
23 import com.sun.star.lib.util.NativeLibraryLoader;
24 import com.sun.star.uno.Type;
25 import com.sun.star.uno.UnoRuntime;
26 import com.sun.star.uno.IEnvironment;
27 import com.sun.star.uno.IQueryInterface;
28 
29 
30 
31 public final class JNI_proxy implements java.lang.reflect.InvocationHandler
32 {
33  static {
34  if ("The Android Project".equals(System.getProperty("java.vendor"))) {
35  // See corresponding code in
36  // javaunohelper/com/sun/star/comp/helper/Bootstrap.java for more
37  // comments.
38 
39  boolean disable_dynloading = false;
40  try {
41  System.loadLibrary("lo-bootstrap");
42  } catch (UnsatisfiedLinkError e) {
43  disable_dynloading = true;
44  }
45 
46  if (!disable_dynloading)
47  NativeLibraryLoader.loadLibrary(JNI_info_holder.class.getClassLoader(),
48  "java_uno");
49  } else
50  NativeLibraryLoader.loadLibrary(JNI_proxy.class.getClassLoader(),
51  "java_uno");
52  }
53  private static ClassLoader s_classloader =
54  JNI_proxy.class.getClassLoader();
55  private static Class s_InvocationHandler [] =
56  new Class [] { java.lang.reflect.InvocationHandler.class };
57 
58  private long m_bridge_handle;
59  private final IEnvironment m_java_env;
61  private long m_receiver_handle; // on the C++ side, this is a "UNO_Interface *"
62  private long m_td_handle; // on the C++ side, this is a "typelib_TypeDescription *"
63  private final Type m_type;
64  private final String m_oid;
65  private final Class m_class;
66  private final AsynchronousFinalizer m_finalizer;
67 
68  public static String get_stack_trace( Throwable throwable )
69  throws Throwable
70  {
71  boolean current_trace = false;
72  if (null == throwable)
73  {
74  throwable = new Throwable();
75  current_trace = true;
76  }
77  java.io.StringWriter string_writer =
78  new java.io.StringWriter();
79  java.io.PrintWriter print_writer =
80  new java.io.PrintWriter( string_writer, true );
81  throwable.printStackTrace( print_writer );
82  print_writer.flush();
83  print_writer.close();
84  string_writer.flush();
85  String trace = string_writer.toString();
86  if (current_trace)
87  {
88  // cut out first two lines
89  int n = trace.indexOf( '\n' );
90  n = trace.indexOf( '\n', n +1 );
91  trace = trace.substring( n +1 );
92  }
93  return "\njava stack trace:\n" + trace;
94  }
95 
96  private native void finalize( long bridge_handle );
97 
98  @Override
99  protected void finalize()
100  {
101  if (m_finalizer != null) {
102  m_finalizer.add(new AsynchronousFinalizer.Job() {
103  public void run() throws Throwable {
104  JNI_proxy.this.finalize( m_bridge_handle );
105  }
106  });
107  }
108  }
109 
110  private JNI_proxy(
111  long bridge_handle, IEnvironment java_env,
112  long receiver_handle, long td_handle, Type type, String oid,
113  AsynchronousFinalizer finalizer)
114  {
115  m_bridge_handle = bridge_handle;
116  m_java_env = java_env;
117  m_receiver_handle = receiver_handle;
118  m_td_handle = td_handle;
119  m_type = type;
120  m_oid = oid;
121  m_class = m_type.getZClass();
122  m_finalizer = finalizer;
123  }
124 
125  public static Object create(
126  long bridge_handle, IEnvironment java_env,
127  long receiver_handle, long td_handle, Type type, String oid,
128  java.lang.reflect.Constructor proxy_ctor,
129  AsynchronousFinalizer finalizer)
130  throws Throwable
131  {
132  JNI_proxy handler = new JNI_proxy(
133  bridge_handle, java_env, receiver_handle, td_handle, type, oid,
134  finalizer);
135  Object proxy = proxy_ctor.newInstance( new Object [] { handler } );
136  return java_env.registerInterface( proxy, new String [] { oid }, type );
137  }
138 
139  public static java.lang.reflect.Constructor get_proxy_ctor( Class clazz )
140  throws Throwable
141  {
142  Class proxy_class = java.lang.reflect.Proxy.getProxyClass(
143  s_classloader,
144  new Class [] { clazz, IQueryInterface.class,
145  com.sun.star.lib.uno.Proxy.class } );
146  return proxy_class.getConstructor( s_InvocationHandler );
147  }
148 
149  private native Object dispatch_call(
150  long bridge_handle, String method, Object args [] )
151  throws Throwable;
152 
153  // InvocationHandler impl
154 
155  public Object invoke(
156  Object proxy, java.lang.reflect.Method method, Object args [] )
157  throws Throwable
158  {
159  Class<?> decl_class = method.getDeclaringClass();
160  String method_name = method.getName();
161 
162  if (Object.class.equals( decl_class ))
163  {
164  if (method_name.equals( "hashCode" ))
165  {
166  // int hashCode()
167  return Integer.valueOf( m_oid.hashCode() );
168  }
169  else if (method_name.equals( "equals" ))
170  {
171  // boolean equals( Object obj )
172  return isSame(args[0]);
173  }
174  else if (method_name.equals( "toString" ))
175  {
176  // String toString()
177  return this.toString() + " [oid=" + m_oid +
178  ", type=" + m_type.getTypeName() + "]";
179  }
180  }
181  // UNO interface call
182  else if (decl_class.isAssignableFrom( m_class ))
183  {
184  // dispatch interface call
185  return dispatch_call( m_bridge_handle, method_name, args );
186  }
187  // IQueryInterface impl
188  else if (IQueryInterface.class.equals( decl_class ))
189  {
190  if (method_name.equals( "queryInterface" ))
191  {
192  Object registered_proxy =
193  m_java_env.getRegisteredInterface( m_oid, (Type)args[ 0 ] );
194  if (null == registered_proxy)
195  {
196  return dispatch_call( m_bridge_handle, method_name, args );
197  }
198  else
199  {
200  return registered_proxy;
201  }
202  }
203  else if (method_name.equals( "isSame" ))
204  {
205  // boolean isSame( Object object )
206  return isSame(args[0]);
207  }
208  else if (method_name.equals( "getOid" ))
209  {
210  return m_oid;
211  }
212  }
213 
214  throw new com.sun.star.uno.RuntimeException(
215  "[jni_uno bridge error] unexpected call on proxy " +
216  proxy.toString() + ": " + method.toString() );
217  }
218 
219  private Boolean isSame(Object obj) {
220  return Boolean.valueOf(obj != null
221  && m_oid.equals(UnoRuntime.generateOid(obj)));
222  }
223 }
224 
225 // vim:set shiftwidth=4 softtabstop=4 expandtab:
Type
JNI_proxy(long bridge_handle, IEnvironment java_env, long receiver_handle, long td_handle, Type type, String oid, AsynchronousFinalizer finalizer)
Definition: JNI_proxy.java:110
static java.lang.reflect.Constructor get_proxy_ctor(Class clazz)
Definition: JNI_proxy.java:139
sal_Int64 n
native
tuple args
static Object create(long bridge_handle, IEnvironment java_env, long receiver_handle, long td_handle, Type type, String oid, java.lang.reflect.Constructor proxy_ctor, AsynchronousFinalizer finalizer)
Definition: JNI_proxy.java:125
native Object dispatch_call(long bridge_handle, String method, Object args[])
final AsynchronousFinalizer m_finalizer
Definition: JNI_proxy.java:66
def run
exports com.sun.star. java
native void finalize(long bridge_handle)
exports com.sun.star. lang
Object invoke(Object proxy, java.lang.reflect.Method method, Object args[])
Definition: JNI_proxy.java:155
ResultType type
static String get_stack_trace(Throwable throwable)
Definition: JNI_proxy.java:68
long m_receiver_handle
these 2 fields are accessed directly from C++
Definition: JNI_proxy.java:61
OUString toString(OptionInfo const *info)