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1 /* |
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2 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 /* |
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27 * This file is available under and governed by the GNU General Public |
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28 * License version 2 only, as published by the Free Software Foundation. |
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29 * However, the following notice accompanied the original version of this |
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30 * file, and Oracle licenses the original version of this file under the BSD |
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31 * license: |
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32 */ |
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33 /* |
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34 Copyright 2009-2013 Attila Szegedi |
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35 |
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36 Licensed under both the Apache License, Version 2.0 (the "Apache License") |
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37 and the BSD License (the "BSD License"), with licensee being free to |
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38 choose either of the two at their discretion. |
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39 |
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40 You may not use this file except in compliance with either the Apache |
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41 License or the BSD License. |
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42 |
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43 If you choose to use this file in compliance with the Apache License, the |
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44 following notice applies to you: |
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45 |
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46 You may obtain a copy of the Apache License at |
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47 |
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48 http://www.apache.org/licenses/LICENSE-2.0 |
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49 |
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50 Unless required by applicable law or agreed to in writing, software |
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51 distributed under the License is distributed on an "AS IS" BASIS, |
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52 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
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53 implied. See the License for the specific language governing |
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54 permissions and limitations under the License. |
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55 |
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56 If you choose to use this file in compliance with the BSD License, the |
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57 following notice applies to you: |
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58 |
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59 Redistribution and use in source and binary forms, with or without |
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60 modification, are permitted provided that the following conditions are |
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61 met: |
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62 * Redistributions of source code must retain the above copyright |
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63 notice, this list of conditions and the following disclaimer. |
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64 * Redistributions in binary form must reproduce the above copyright |
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65 notice, this list of conditions and the following disclaimer in the |
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66 documentation and/or other materials provided with the distribution. |
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67 * Neither the name of the copyright holder nor the names of |
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68 contributors may be used to endorse or promote products derived from |
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69 this software without specific prior written permission. |
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70 |
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71 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
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72 IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
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73 TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A |
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74 PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER |
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75 BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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76 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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77 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
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78 BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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79 WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
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80 OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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81 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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82 */ |
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83 |
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84 package jdk.internal.dynalink; |
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85 |
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86 import java.lang.invoke.MethodHandles.Lookup; |
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87 import java.lang.invoke.MethodType; |
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88 import jdk.internal.dynalink.support.CallSiteDescriptorFactory; |
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89 |
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90 /** |
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91 * An immutable descriptor of a call site. It is an immutable object that contains all the information about a call |
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92 * site: the class performing the lookups, the name of the method being invoked, and the method signature. The library |
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93 * has a default {@link CallSiteDescriptorFactory} for descriptors that you can use, or you can create your own |
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94 * descriptor classes, especially if you need to add further information (values passed in additional parameters to the |
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95 * bootstrap method) to them. Call site descriptors are used in this library in place of passing a real call site to |
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96 * guarding linkers so they aren't tempted to directly manipulate the call sites. The constructors of built-in |
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97 * {@link RelinkableCallSite} implementations all need a call site descriptor. Even if you create your own call site |
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98 * descriptors consider using {@link CallSiteDescriptorFactory#tokenizeName(String)} in your implementation. |
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99 * |
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100 * @author Attila Szegedi |
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101 */ |
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102 public interface CallSiteDescriptor { |
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103 /** |
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104 * The index of the name token that will carry the operation scheme prefix (usually, "dyn"). |
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105 */ |
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106 public static final int SCHEME = 0; |
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107 /** |
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108 * The index of the name token that will usually carry the operation name. |
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109 */ |
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110 |
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111 public static final int OPERATOR=1; |
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112 /** |
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113 * The index of the name token that will usually carry a name of an operand (of a property, method, etc.) |
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114 */ |
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115 |
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116 public static final int NAME_OPERAND=2; |
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117 |
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118 /** |
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119 * Character used to delimit tokens in an call site name. |
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120 */ |
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121 public static final String TOKEN_DELIMITER = ":"; |
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122 |
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123 /** |
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124 * Character used to delimit operation names in a composite operation specification. |
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125 */ |
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126 public static final String OPERATOR_DELIMITER = "|"; |
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127 |
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128 /** |
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129 * Returns the number of tokens in the name of the method at the call site. Method names are tokenized with the |
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130 * colon ":" character, i.e. "dyn:getProp:color" would be the name used to describe a method that retrieves the |
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131 * property named "color" on the object it is invoked on. |
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132 * @return the number of tokens in the name of the method at the call site. |
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133 */ |
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134 public int getNameTokenCount(); |
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135 |
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136 /** |
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137 * Returns the <i>i<sup>th</sup></i> token in the method name at the call site. Method names are tokenized with the |
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138 * colon ":" character. |
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139 * @param i the index of the token. Must be between 0 (inclusive) and {@link #getNameTokenCount()} (exclusive) |
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140 * @throws IllegalArgumentException if the index is outside the allowed range. |
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141 * @return the <i>i<sup>th</sup></i> token in the method name at the call site. The returned strings are interned. |
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142 */ |
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143 public String getNameToken(int i); |
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144 |
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145 /** |
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146 * Returns the name of the method at the call site. Note that the object internally only stores the tokenized name, |
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147 * and has to reconstruct the full name from tokens on each invocation. |
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148 * @return the name of the method at the call site. |
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149 */ |
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150 public String getName(); |
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151 |
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152 /** |
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153 * The type of the method at the call site. |
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154 * |
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155 * @return type of the method at the call site. |
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156 */ |
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157 public MethodType getMethodType(); |
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158 |
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159 /** |
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160 * Returns the lookup passed to the bootstrap method. |
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161 * @return the lookup passed to the bootstrap method. |
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162 */ |
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163 public Lookup getLookup(); |
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164 |
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165 /** |
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166 * Creates a new call site descriptor from this descriptor, which is identical to this, except it changes the method |
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167 * type. |
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168 * |
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169 * @param newMethodType the new method type |
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170 * @return a new call site descriptor, with the method type changed. |
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171 */ |
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172 public CallSiteDescriptor changeMethodType(MethodType newMethodType); |
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173 |
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174 } |