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annotate graal/com.oracle.truffle.dsl.processor/src/com/oracle/truffle/dsl/processor/model/TemplateMethodParser.java @ 16759:23415229349b

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Truffle-DSL: new package structure.
author Christian Humer <christian.humer@gmail.com>
date Mon, 11 Aug 2014 15:57:14 +0200
parents graal/com.oracle.truffle.dsl.processor/src/com/oracle/truffle/dsl/processor/template/TemplateMethodParser.java@bd28da642eea
children
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1 /*
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2 * Copyright (c) 2012, 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.truffle.dsl.processor.model;
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24
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25 import static com.oracle.truffle.dsl.processor.java.ElementUtils.*;
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27 import java.lang.annotation.*;
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28 import java.util.*;
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30 import javax.lang.model.element.*;
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31 import javax.lang.model.type.*;
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32 import javax.lang.model.util.*;
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34 import com.oracle.truffle.dsl.processor.*;
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35 import com.oracle.truffle.dsl.processor.java.*;
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37 public abstract class TemplateMethodParser<T extends Template, E extends TemplateMethod> {
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39 private final ProcessorContext context;
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41 protected final T template;
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43 private boolean emitErrors = true;
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44 private boolean parseNullOnError = false;
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45 private boolean useVarArgs = false;
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47 public TemplateMethodParser(ProcessorContext context, T template) {
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48 this.template = template;
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49 this.context = context;
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50 }
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51
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52 protected void setUseVarArgs(boolean useVarArgs) {
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53 this.useVarArgs = useVarArgs;
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54 }
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56 public boolean isUseVarArgs() {
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57 return useVarArgs;
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58 }
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59
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60 public boolean isEmitErrors() {
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61 return emitErrors;
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62 }
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64 public void setParseNullOnError(boolean nullOnError) {
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65 this.parseNullOnError = nullOnError;
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66 }
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68 public boolean isParseNullOnError() {
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69 return parseNullOnError;
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70 }
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72 public void setEmitErrors(boolean emitErrors) {
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73 this.emitErrors = emitErrors;
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74 }
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76 public ProcessorContext getContext() {
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77 return context;
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78 }
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80 public TypeSystemData getTypeSystem() {
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81 return template.getTypeSystem();
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82 }
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84 public abstract MethodSpec createSpecification(ExecutableElement method, AnnotationMirror mirror);
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85
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86 public abstract E create(TemplateMethod method, boolean invalid);
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88 public abstract boolean isParsable(ExecutableElement method);
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90 public Class<? extends Annotation> getAnnotationType() {
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91 return null;
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92 }
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94 public final List<E> parse(List<? extends Element> elements) {
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95 List<ExecutableElement> methods = new ArrayList<>();
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96 methods.addAll(ElementFilter.methodsIn(elements));
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98 List<E> parsedMethods = new ArrayList<>();
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99 boolean valid = true;
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100 int naturalOrder = 0;
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101 for (ExecutableElement method : methods) {
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102 if (!isParsable(method)) {
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103 continue;
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104 }
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106 Class<? extends Annotation> annotationType = getAnnotationType();
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107 AnnotationMirror mirror = null;
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108 if (annotationType != null) {
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109 mirror = ElementUtils.findAnnotationMirror(getContext().getEnvironment(), method, annotationType);
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110 }
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111
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112 E parsedMethod = parse(naturalOrder, method, mirror);
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113
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114 if (method.getModifiers().contains(Modifier.PRIVATE) && emitErrors) {
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115 parsedMethod.addError("Method annotated with @%s must not be private.", getAnnotationType().getSimpleName());
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116 parsedMethods.add(parsedMethod);
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117 valid = false;
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118 continue;
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119 }
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120
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121 if (parsedMethod != null) {
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122 parsedMethods.add(parsedMethod);
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123 } else {
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124 valid = false;
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125 }
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126 naturalOrder++;
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127 }
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128 Collections.sort(parsedMethods);
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129
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130 if (!valid && parseNullOnError) {
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131 return null;
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132 }
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133 return parsedMethods;
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134 }
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135
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136 private E parse(int naturalOrder, ExecutableElement method, AnnotationMirror annotation) {
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137 MethodSpec methodSpecification = createSpecification(method, annotation);
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138 if (methodSpecification == null) {
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139 return null;
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140 }
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141
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142 methodSpecification.applyTypeDefinitions("types");
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143
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144 String id = method.getSimpleName().toString();
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145 TypeMirror returnType = method.getReturnType();
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146 List<TypeMirror> parameterTypes = new ArrayList<>();
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147 for (VariableElement var : method.getParameters()) {
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148 parameterTypes.add(var.asType());
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149 }
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150
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151 return parseImpl(methodSpecification, naturalOrder, id, method, annotation, returnType, parameterTypes);
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152 }
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153
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154 private E parseImpl(MethodSpec methodSpecification, int naturalOrder, String id, ExecutableElement method, AnnotationMirror annotation, TypeMirror returnType, List<TypeMirror> parameterTypes) {
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155 ParameterSpec returnTypeSpec = methodSpecification.getReturnType();
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156 Parameter returnTypeMirror = matchParameter(returnTypeSpec, returnType, -1, -1);
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157 if (returnTypeMirror == null) {
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158 if (emitErrors) {
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159 E invalidMethod = create(new TemplateMethod(id, naturalOrder, template, methodSpecification, method, annotation, returnTypeMirror, Collections.<Parameter> emptyList()), true);
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160 String expectedReturnType = returnTypeSpec.toSignatureString(true);
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161 String actualReturnType = ElementUtils.getSimpleName(returnType);
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162
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163 String message = String.format("The provided return type \"%s\" does not match expected return type \"%s\".\nExpected signature: \n %s", actualReturnType, expectedReturnType,
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164 methodSpecification.toSignatureString(method.getSimpleName().toString()));
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165 invalidMethod.addError(message);
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166 return invalidMethod;
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167 } else {
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168 return null;
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169 }
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170 }
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171
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172 List<Parameter> parameters = parseParameters(methodSpecification, parameterTypes, isUseVarArgs() && method != null ? method.isVarArgs() : false);
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173 if (parameters == null) {
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174 if (isEmitErrors() && method != null) {
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175 E invalidMethod = create(new TemplateMethod(id, naturalOrder, template, methodSpecification, method, annotation, returnTypeMirror, Collections.<Parameter> emptyList()), true);
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176 String message = String.format("Method signature %s does not match to the expected signature: \n%s", createActualSignature(method),
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177 methodSpecification.toSignatureString(method.getSimpleName().toString()));
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178 invalidMethod.addError(message);
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179 return invalidMethod;
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180 } else {
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181 return null;
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182 }
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183 }
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184
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185 return create(new TemplateMethod(id, naturalOrder, template, methodSpecification, method, annotation, returnTypeMirror, parameters), false);
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186 }
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187
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188 private static String createActualSignature(ExecutableElement method) {
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189 StringBuilder b = new StringBuilder("(");
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190 String sep = "";
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191 if (method != null) {
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192 for (VariableElement var : method.getParameters()) {
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193 b.append(sep);
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194 b.append(ElementUtils.getSimpleName(var.asType()));
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195 sep = ", ";
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196 }
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197 }
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198 b.append(")");
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199 return b.toString();
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200 }
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201
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202 /*
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203 * Parameter parsing tries to parse required arguments starting from offset 0 with increasing
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204 * offset until it finds a signature end that matches the required specification. If there is no
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205 * end matching the required arguments, parsing fails. Parameters prior to the parsed required
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206 * ones are cut and used to parse the optional parameters.
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207 */
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208 private List<Parameter> parseParameters(MethodSpec spec, List<TypeMirror> parameterTypes, boolean varArgs) {
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209 List<Parameter> parsedRequired = null;
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210 int offset = 0;
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211 for (; offset <= parameterTypes.size(); offset++) {
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212 List<TypeMirror> parameters = new ArrayList<>();
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213 parameters.addAll(parameterTypes.subList(offset, parameterTypes.size()));
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214 parsedRequired = parseParametersRequired(spec, parameters, varArgs);
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215 if (parsedRequired != null) {
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216 break;
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217 }
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218 }
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219
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220 if (parsedRequired == null) {
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221 return null;
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222 }
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223
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224 if (parsedRequired.isEmpty() && offset == 0) {
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225 offset = parameterTypes.size();
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226 }
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227 List<TypeMirror> potentialOptionals = parameterTypes.subList(0, offset);
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228 List<Parameter> parsedOptionals = parseParametersOptional(spec, potentialOptionals);
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229 if (parsedOptionals == null) {
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230 return null;
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231 }
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232
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233 List<Parameter> finalParameters = new ArrayList<>();
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234 finalParameters.addAll(parsedOptionals);
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235 finalParameters.addAll(parsedRequired);
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236 return finalParameters;
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237 }
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238
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239 private List<Parameter> parseParametersOptional(MethodSpec spec, List<TypeMirror> types) {
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240 List<Parameter> parsedParams = new ArrayList<>();
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241
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242 int typeStartIndex = 0;
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243 List<ParameterSpec> specifications = spec.getOptional();
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244 outer: for (int specIndex = 0; specIndex < specifications.size(); specIndex++) {
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245 ParameterSpec specification = specifications.get(specIndex);
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246 for (int typeIndex = typeStartIndex; typeIndex < types.size(); typeIndex++) {
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247 TypeMirror actualType = types.get(typeIndex);
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248 Parameter optionalParam = matchParameter(specification, actualType, -1, -1);
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249 if (optionalParam != null) {
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250 parsedParams.add(optionalParam);
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251 typeStartIndex = typeIndex + 1;
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252 continue outer;
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253 }
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254 }
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255 }
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256
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257 if (typeStartIndex < types.size()) {
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258 // not enough types found
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259 return null;
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260 }
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261 return parsedParams;
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262 }
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263
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264 private List<Parameter> parseParametersRequired(MethodSpec spec, List<TypeMirror> types, boolean typeVarArgs) {
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265 List<Parameter> parsedParams = new ArrayList<>();
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266 List<ParameterSpec> specifications = spec.getRequired();
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267 boolean specVarArgs = spec.isVariableRequiredParameters();
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268 int typeIndex = 0;
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269 int specificationIndex = 0;
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270
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271 ParameterSpec specification;
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272 while ((specification = nextSpecification(specifications, specificationIndex, specVarArgs)) != null) {
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273 TypeMirror actualType = nextActualType(types, typeIndex, typeVarArgs);
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274 if (actualType == null) {
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275 if (spec.isIgnoreAdditionalSpecifications()) {
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276 break;
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277 }
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278 return null;
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279 }
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280
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281 int typeVarArgsIndex = typeVarArgs ? typeIndex - types.size() + 1 : -1;
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282 int specVarArgsIndex = specVarArgs ? specificationIndex - specifications.size() + 1 : -1;
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283
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284 if (typeVarArgsIndex >= 0 && specVarArgsIndex >= 0) {
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285 // both specifications and types have a variable number of arguments
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286 // we would get into an endless loop if we would continue
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287 break;
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288 }
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289
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290 Parameter resolvedParameter = matchParameter(specification, actualType, specVarArgsIndex, typeVarArgsIndex);
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291 if (resolvedParameter == null) {
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292 return null;
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293 }
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294 parsedParams.add(resolvedParameter);
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295 typeIndex++;
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296 specificationIndex++;
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297 }
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298
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299 if (typeIndex < types.size()) {
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300 // additional types available
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diff changeset
301 if (spec.isIgnoreAdditionalParameters()) {
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302 return parsedParams;
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303 } else {
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304 return null;
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305 }
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diff changeset
306 }
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diff changeset
307
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diff changeset
308 return parsedParams;
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diff changeset
309 }
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310
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311 private static ParameterSpec nextSpecification(List<ParameterSpec> specifications, int specIndex, boolean varArgs) {
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312 if (varArgs && specIndex >= specifications.size() - 1 && !specifications.isEmpty()) {
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313 return specifications.get(specifications.size() - 1);
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314 } else if (specIndex < specifications.size()) {
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315 return specifications.get(specIndex);
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316 } else {
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317 return null;
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diff changeset
318 }
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319 }
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320
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diff changeset
321 private static TypeMirror nextActualType(List<TypeMirror> types, int typeIndex, boolean varArgs) {
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322 if (varArgs && typeIndex >= types.size() - 1 && !types.isEmpty()) {
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diff changeset
323 // unpack varargs array argument
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324 TypeMirror actualType = types.get(types.size() - 1);
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diff changeset
325 if (actualType.getKind() == TypeKind.ARRAY) {
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diff changeset
326 actualType = ((ArrayType) actualType).getComponentType();
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327 }
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328 return actualType;
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329 } else if (typeIndex < types.size()) {
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diff changeset
330 return types.get(typeIndex);
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diff changeset
331 } else {
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diff changeset
332 return null;
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333 }
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334 }
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335
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336 private Parameter matchParameter(ParameterSpec specification, TypeMirror mirror, int specificationIndex, int varArgsIndex) {
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337 TypeMirror resolvedType = mirror;
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338 if (hasError(resolvedType)) {
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339 return null;
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340 }
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341
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342 if (!specification.matches(resolvedType)) {
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343 return null;
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344 }
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345
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346 TypeData resolvedTypeData = getTypeSystem().findTypeData(resolvedType);
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347 if (resolvedTypeData != null) {
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348 return new Parameter(specification, resolvedTypeData, specificationIndex, varArgsIndex);
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349 } else {
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350 return new Parameter(specification, resolvedType, specificationIndex, varArgsIndex);
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351 }
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352 }
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353
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354 public final E create(String id, int naturalOrder, ExecutableElement methodMetadata, AnnotationMirror mirror, TypeMirror returnType, List<TypeMirror> parameterTypes) {
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355 return parseImpl(createSpecification(methodMetadata, mirror), naturalOrder, id, methodMetadata, mirror, returnType, parameterTypes);
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356 }
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357 }