Mercurial > hg > truffle
annotate graal/com.oracle.jvmci.options/src/com/oracle/jvmci/options/OptionValue.java @ 21687:afea1d08c393
Merge with df4579cb9503128c646bd04e66646ccfa7faf25f
author | Michael Van De Vanter <michael.van.de.vanter@oracle.com> |
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date | Tue, 02 Jun 2015 18:32:11 -0700 |
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1 /* |
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2 * Copyright (c) 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. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 package com.oracle.jvmci.options; |
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24 |
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25 import java.io.*; |
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26 import java.util.*; |
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27 import java.util.Map.Entry; |
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28 |
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29 /** |
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30 * An option value. |
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31 */ |
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32 public class OptionValue<T> { |
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33 /** |
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34 * Temporarily changes the value for an option. The {@linkplain OptionValue#getValue() value} of |
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35 * {@code option} is set to {@code value} until {@link OverrideScope#close()} is called on the |
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36 * object returned by this method. |
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37 * <p> |
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38 * Since the returned object is {@link AutoCloseable} the try-with-resource construct can be |
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39 * used: |
14763 | 40 * |
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41 * <pre> |
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42 * try (OverrideScope s = OptionValue.override(myOption, myValue) { |
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43 * // code that depends on myOption == myValue |
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44 * } |
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45 * </pre> |
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46 */ |
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47 public static OverrideScope override(OptionValue<?> option, Object value) { |
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48 OverrideScope current = getOverrideScope(); |
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49 if (current == null) { |
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50 if (!value.equals(option.getValue())) { |
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51 return new SingleOverrideScope(option, value); |
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52 } |
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53 Map<OptionValue<?>, Object> overrides = Collections.emptyMap(); |
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54 return new MultipleOverridesScope(current, overrides); |
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55 } |
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56 return new MultipleOverridesScope(current, option, value); |
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57 } |
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58 |
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59 /** |
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60 * Temporarily changes the values for a set of options. The {@linkplain OptionValue#getValue() |
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61 * value} of each {@code option} in {@code overrides} is set to the corresponding {@code value} |
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62 * in {@code overrides} until {@link OverrideScope#close()} is called on the object returned by |
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63 * this method. |
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64 * <p> |
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65 * Since the returned object is {@link AutoCloseable} the try-with-resource construct can be |
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66 * used: |
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68 * <pre> |
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70 * overrides.put(myOption1, myValue1); |
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71 * overrides.put(myOption2, myValue2); |
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72 * try (OverrideScope s = OptionValue.override(overrides) { |
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73 * // code that depends on myOption == myValue |
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74 * } |
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75 * </pre> |
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76 */ |
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77 public static OverrideScope override(Map<OptionValue<?>, Object> overrides) { |
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78 OverrideScope current = getOverrideScope(); |
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79 if (current == null && overrides.size() == 1) { |
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80 Entry<OptionValue<?>, Object> single = overrides.entrySet().iterator().next(); |
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81 OptionValue<?> option = single.getKey(); |
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82 Object overrideValue = single.getValue(); |
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83 if (!overrideValue.equals(option.getValue())) { |
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84 return new SingleOverrideScope(option, overrideValue); |
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85 } |
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86 } |
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87 return new MultipleOverridesScope(current, overrides); |
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88 } |
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89 |
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90 /** |
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91 * Temporarily changes the values for a set of options. The {@linkplain OptionValue#getValue() |
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92 * value} of each {@code option} in {@code overrides} is set to the corresponding {@code value} |
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93 * in {@code overrides} until {@link OverrideScope#close()} is called on the object returned by |
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94 * this method. |
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95 * <p> |
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96 * Since the returned object is {@link AutoCloseable} the try-with-resource construct can be |
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97 * used: |
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99 * <pre> |
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100 * try (OverrideScope s = OptionValue.override(myOption1, myValue1, myOption2, myValue2) { |
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101 * // code that depends on myOption == myValue |
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102 * } |
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103 * </pre> |
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105 * @param overrides overrides in the form {@code [option1, override1, option2, override2, ...]} |
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106 */ |
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107 public static OverrideScope override(Object... overrides) { |
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108 OverrideScope current = getOverrideScope(); |
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109 if (current == null && overrides.length == 2) { |
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110 OptionValue<?> option = (OptionValue<?>) overrides[0]; |
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111 Object overrideValue = overrides[1]; |
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112 if (!overrideValue.equals(option.getValue())) { |
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113 return new SingleOverrideScope(option, overrideValue); |
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114 } |
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115 } |
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116 Map<OptionValue<?>, Object> map = Collections.emptyMap(); |
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117 for (int i = 0; i < overrides.length; i += 2) { |
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118 OptionValue<?> option = (OptionValue<?>) overrides[i]; |
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119 Object overrideValue = overrides[i + 1]; |
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120 if (!overrideValue.equals(option.getValue())) { |
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121 if (map.isEmpty()) { |
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122 map = new HashMap<>(); |
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123 } |
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124 map.put(option, overrideValue); |
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125 } |
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126 } |
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127 return new MultipleOverridesScope(current, map); |
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128 } |
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129 |
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130 private static final ThreadLocal<OverrideScope> overrideScopeTL = new ThreadLocal<>(); |
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131 |
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132 protected static OverrideScope getOverrideScope() { |
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133 return overrideScopeTL.get(); |
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134 } |
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135 |
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136 protected static void setOverrideScope(OverrideScope overrideScope) { |
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137 overrideScopeTL.set(overrideScope); |
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138 } |
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139 |
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140 private T defaultValue; |
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141 |
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142 /** |
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143 * The raw option value. |
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144 */ |
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145 protected T value; |
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146 |
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147 private OptionDescriptor descriptor; |
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148 |
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149 private long reads; |
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150 private OptionValue<?> next; |
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151 private static OptionValue<?> head; |
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152 |
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153 private static final boolean ShowReadsHistogram = Boolean.getBoolean("jvmci.showOptionValueReadsHistogram"); |
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154 |
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155 private static void addToHistogram(OptionValue<?> option) { |
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156 if (ShowReadsHistogram) { |
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157 synchronized (OptionValue.class) { |
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158 option.next = head; |
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159 head = option; |
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160 } |
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161 } |
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162 } |
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163 |
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164 @SuppressWarnings("unchecked") |
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165 public OptionValue(T value) { |
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166 this.defaultValue = value; |
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167 this.value = (T) DEFAULT; |
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168 addToHistogram(this); |
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169 } |
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170 |
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171 private static final Object DEFAULT = "DEFAULT"; |
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172 private static final Object UNINITIALIZED = "UNINITIALIZED"; |
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173 |
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174 /** |
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175 * Creates an uninitialized option value for a subclass that initializes itself |
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176 * {@link #defaultValue() lazily}. |
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177 */ |
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178 @SuppressWarnings("unchecked") |
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179 protected OptionValue() { |
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180 this.defaultValue = (T) UNINITIALIZED; |
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181 this.value = (T) DEFAULT; |
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182 addToHistogram(this); |
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183 } |
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184 |
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185 /** |
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186 * Lazy initialization of default value. |
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187 */ |
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188 protected T defaultValue() { |
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189 throw new InternalError("Option without a default value value must override defaultValue()"); |
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190 } |
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191 |
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192 /** |
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193 * Sets the descriptor for this option. |
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194 */ |
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195 public void setDescriptor(OptionDescriptor descriptor) { |
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196 this.descriptor = descriptor; |
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197 } |
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198 |
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199 /** |
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200 * Returns the descriptor for this option, if it has been set by |
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201 * {@link #setDescriptor(OptionDescriptor)}. |
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202 */ |
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203 public OptionDescriptor getDescriptor() { |
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204 return descriptor; |
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205 } |
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206 |
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207 /** |
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208 * Gets the name of this option. The name for an option value with a null |
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209 * {@linkplain #setDescriptor(OptionDescriptor) descriptor} is the value of |
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210 * {@link Object#toString()}. |
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211 */ |
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212 public String getName() { |
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213 return descriptor == null ? super.toString() : (descriptor.getDeclaringClass().getName() + "." + descriptor.getName()); |
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214 } |
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215 |
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216 @Override |
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217 public String toString() { |
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218 return getName() + "=" + getValue(); |
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219 } |
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220 |
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221 /** |
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222 * The initial value specified in source code. The returned value is not affected by calls to |
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223 * {@link #setValue(Object)} or registering {@link OverrideScope}s. Therefore, it is also not |
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224 * affected by options set on the command line. |
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225 */ |
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226 public T getDefaultValue() { |
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227 if (defaultValue == UNINITIALIZED) { |
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228 defaultValue = defaultValue(); |
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229 } |
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230 return defaultValue; |
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231 } |
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232 |
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233 /** |
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234 * Returns true if the option has the same value that was set in the source code. |
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235 */ |
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236 public boolean hasDefaultValue() { |
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237 getValue(); // ensure initialized |
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238 return value == DEFAULT || Objects.equals(value, getDefaultValue()); |
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239 } |
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240 |
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241 /** |
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242 * Gets the value of this option. |
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243 */ |
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244 public T getValue() { |
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245 if (ShowReadsHistogram) { |
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246 reads++; |
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247 } |
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248 if (!(this instanceof StableOptionValue)) { |
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249 OverrideScope overrideScope = getOverrideScope(); |
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250 if (overrideScope != null) { |
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251 T override = overrideScope.getOverride(this); |
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252 if (override != null) { |
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253 return override; |
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254 } |
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255 } |
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256 } |
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257 if (value != DEFAULT) { |
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258 return value; |
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259 } else { |
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260 return getDefaultValue(); |
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261 } |
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262 } |
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263 |
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264 /** |
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265 * Gets the values of this option including overridden values. |
14763 | 266 * |
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267 * @param c the collection to which the values are added. If null, one is allocated. |
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268 * @return the collection to which the values were added in order from most overridden to |
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269 * current value |
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270 */ |
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271 @SuppressWarnings("unchecked") |
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272 public Collection<T> getValues(Collection<T> c) { |
14763 | 273 Collection<T> values = c == null ? new ArrayList<>() : c; |
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274 if (!(this instanceof StableOptionValue)) { |
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275 OverrideScope overrideScope = getOverrideScope(); |
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276 if (overrideScope != null) { |
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277 overrideScope.getOverrides(this, (Collection<Object>) values); |
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278 } |
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279 } |
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280 if (value != DEFAULT) { |
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281 values.add(value); |
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282 } else { |
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283 values.add(getDefaultValue()); |
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284 } |
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285 return values; |
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286 } |
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287 |
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288 /** |
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289 * Sets the value of this option. |
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290 */ |
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291 @SuppressWarnings("unchecked") |
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292 public void setValue(Object v) { |
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293 this.value = (T) v; |
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294 } |
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295 |
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296 /** |
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297 * An object whose {@link #close()} method reverts the option value overriding initiated by |
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298 * {@link OptionValue#override(OptionValue, Object)} or {@link OptionValue#override(Map)}. |
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299 */ |
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300 public abstract static class OverrideScope implements AutoCloseable { |
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301 |
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302 private Map<DerivedOptionValue<?>, Object> derivedCache = null; |
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303 |
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304 public <T> T getDerived(DerivedOptionValue<T> key) { |
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305 if (derivedCache == null) { |
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306 derivedCache = new HashMap<>(); |
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307 } |
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308 @SuppressWarnings("unchecked") |
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309 T ret = (T) derivedCache.get(key); |
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310 if (ret == null) { |
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311 ret = key.createValue(); |
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312 derivedCache.put(key, ret); |
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313 } |
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314 return ret; |
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315 } |
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316 |
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317 abstract void addToInherited(Map<OptionValue<?>, Object> inherited); |
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318 |
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319 abstract <T> T getOverride(OptionValue<T> option); |
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320 |
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321 abstract void getOverrides(OptionValue<?> option, Collection<Object> c); |
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322 |
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323 public abstract void close(); |
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324 } |
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325 |
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326 static class SingleOverrideScope extends OverrideScope { |
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327 |
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328 private final OptionValue<?> option; |
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329 private final Object value; |
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330 |
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331 public SingleOverrideScope(OptionValue<?> option, Object value) { |
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332 if (option instanceof StableOptionValue) { |
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333 throw new IllegalArgumentException("Cannot override stable option " + option); |
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334 } |
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335 this.option = option; |
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336 this.value = value; |
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337 setOverrideScope(this); |
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338 } |
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339 |
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340 @Override |
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341 void addToInherited(Map<OptionValue<?>, Object> inherited) { |
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342 inherited.put(option, value); |
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343 } |
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344 |
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345 @SuppressWarnings("unchecked") |
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346 @Override |
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347 <T> T getOverride(OptionValue<T> key) { |
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348 if (key == this.option) { |
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349 return (T) value; |
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350 } |
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351 return null; |
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352 } |
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353 |
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354 @Override |
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355 void getOverrides(OptionValue<?> key, Collection<Object> c) { |
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356 if (key == this.option) { |
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357 c.add(value); |
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358 } |
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359 } |
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360 |
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361 @Override |
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362 public void close() { |
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363 setOverrideScope(null); |
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364 } |
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365 } |
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366 |
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367 static class MultipleOverridesScope extends OverrideScope { |
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368 final OverrideScope parent; |
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369 final Map<OptionValue<?>, Object> overrides; |
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370 |
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371 public MultipleOverridesScope(OverrideScope parent, OptionValue<?> option, Object value) { |
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372 this.parent = parent; |
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373 this.overrides = new HashMap<>(); |
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374 if (parent != null) { |
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375 parent.addToInherited(overrides); |
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376 } |
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377 if (option instanceof StableOptionValue) { |
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378 throw new IllegalArgumentException("Cannot override stable option " + option); |
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379 } |
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380 if (!value.equals(option.getValue())) { |
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381 this.overrides.put(option, value); |
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382 } |
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383 if (!overrides.isEmpty()) { |
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384 setOverrideScope(this); |
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385 } |
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386 } |
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387 |
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388 MultipleOverridesScope(OverrideScope parent, Map<OptionValue<?>, Object> overrides) { |
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389 this.parent = parent; |
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390 if (overrides.isEmpty() && parent == null) { |
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391 this.overrides = Collections.emptyMap(); |
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392 return; |
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393 } |
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394 this.overrides = new HashMap<>(); |
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395 if (parent != null) { |
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396 parent.addToInherited(this.overrides); |
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397 } |
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398 for (Map.Entry<OptionValue<?>, Object> e : overrides.entrySet()) { |
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399 OptionValue<?> option = e.getKey(); |
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400 if (option instanceof StableOptionValue) { |
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401 throw new IllegalArgumentException("Cannot override stable option " + option); |
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402 } |
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403 if (!e.getValue().equals(option.getValue())) { |
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404 this.overrides.put(option, e.getValue()); |
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405 } |
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406 } |
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407 if (!this.overrides.isEmpty()) { |
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408 setOverrideScope(this); |
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409 } |
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410 } |
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411 |
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412 @Override |
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413 void addToInherited(Map<OptionValue<?>, Object> inherited) { |
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414 if (parent != null) { |
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415 parent.addToInherited(inherited); |
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416 } |
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417 inherited.putAll(overrides); |
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418 } |
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419 |
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420 @SuppressWarnings("unchecked") |
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421 @Override |
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422 <T> T getOverride(OptionValue<T> option) { |
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423 return (T) overrides.get(option); |
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424 } |
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425 |
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426 @Override |
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427 void getOverrides(OptionValue<?> option, Collection<Object> c) { |
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428 Object v = overrides.get(option); |
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429 if (v != null) { |
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430 c.add(v); |
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431 } |
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432 if (parent != null) { |
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433 parent.getOverrides(option, c); |
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434 } |
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435 } |
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436 |
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437 @Override |
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438 public void close() { |
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439 if (!overrides.isEmpty()) { |
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440 setOverrideScope(parent); |
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441 } |
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442 } |
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443 } |
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444 |
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445 static { |
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446 if (ShowReadsHistogram) { |
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447 Runtime.getRuntime().addShutdownHook(new Thread() { |
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448 @Override |
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449 public void run() { |
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450 ArrayList<OptionValue<?>> options = new ArrayList<>(); |
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451 for (OptionValue<?> option = head; option != null; option = option.next) { |
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452 options.add(option); |
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453 } |
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454 Collections.sort(options, new Comparator<OptionValue<?>>() { |
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455 |
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456 public int compare(OptionValue<?> o1, OptionValue<?> o2) { |
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457 if (o1.reads < o2.reads) { |
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458 return -1; |
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459 } else if (o1.reads > o2.reads) { |
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460 return 1; |
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461 } else { |
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462 return o1.getName().compareTo(o2.getName()); |
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463 } |
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464 } |
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465 }); |
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466 PrintStream out = System.out; |
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467 out.println("=== OptionValue reads histogram ==="); |
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468 for (OptionValue<?> option : options) { |
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469 out.println(option.reads + "\t" + option); |
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470 } |
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471 } |
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472 }); |
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473 } |
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474 } |
9849
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475 } |