aboutsummaryrefslogtreecommitdiff
path: root/src/core/lombok/javac/handlers/JavacSingularsRecipes.java
blob: 5055f872297a54d31307b96d015c4167510e44e3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
/*
 * Copyright (C) 2015 The Project Lombok Authors.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package lombok.javac.handlers;

import static lombok.javac.Javac.*;
import static lombok.javac.handlers.JavacHandlerUtil.*;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import lombok.core.LombokImmutableList;
import lombok.core.SpiLoadUtil;
import lombok.core.TypeLibrary;
import lombok.javac.JavacNode;
import lombok.javac.JavacTreeMaker;

import com.sun.source.tree.Tree.Kind;
import com.sun.tools.javac.code.BoundKind;
import com.sun.tools.javac.tree.JCTree;
import com.sun.tools.javac.tree.JCTree.JCExpression;
import com.sun.tools.javac.tree.JCTree.JCStatement;
import com.sun.tools.javac.tree.JCTree.JCWildcard;
import com.sun.tools.javac.util.Context;
import com.sun.tools.javac.util.List;
import com.sun.tools.javac.util.ListBuffer;
import com.sun.tools.javac.util.Name;

public class JavacSingularsRecipes {
	private static final JavacSingularsRecipes INSTANCE = new JavacSingularsRecipes();
	private final Map<String, JavacSingularizer> singularizers = new HashMap<String, JavacSingularizer>();
	private final TypeLibrary singularizableTypes = new TypeLibrary();
	
	private JavacSingularsRecipes() {
		try {
			loadAll(singularizableTypes, singularizers);
			singularizableTypes.lock();
		} catch (IOException e) {
			System.err.println("Lombok's @Singularizable feature is broken due to misconfigured SPI files: " + e);
		}
	}
	
	private static void loadAll(TypeLibrary library, Map<String, JavacSingularizer> map) throws IOException {
		for (JavacSingularizer handler : SpiLoadUtil.findServices(JavacSingularizer.class, JavacSingularizer.class.getClassLoader())) {
			for (String type : handler.getSupportedTypes()) {
				JavacSingularizer existingSingularizer = map.get(type);
				if (existingSingularizer != null) {
					JavacSingularizer toKeep = existingSingularizer.getClass().getName().compareTo(handler.getClass().getName()) > 0 ? handler : existingSingularizer;
					System.err.println("Multiple singularizers found for type " + type + "; the alphabetically first class is used: " + toKeep.getClass().getName());
					map.put(type, toKeep);
				} else {
					map.put(type, handler);
					library.addType(type);
				}
			}
		}
	}
	
	public static JavacSingularsRecipes get() {
		return INSTANCE;
	}
	
	public String toQualified(String typeReference) {
		return singularizableTypes.toQualified(typeReference);
	}
	
	public JavacSingularizer getSingularizer(String fqn) {
		return singularizers.get(fqn);
	}
	
	public static final class SingularData {
		private final JavacNode annotation;
		private final Name singularName;
		private final Name pluralName;
		private final List<JCExpression> typeArgs;
		private final String targetFqn;
		private final JavacSingularizer singularizer;
		
		public SingularData(JavacNode annotation, Name singularName, Name pluralName, List<JCExpression> typeArgs, String targetFqn, JavacSingularizer singularizer) {
			this.annotation = annotation;
			this.singularName = singularName;
			this.pluralName = pluralName;
			this.typeArgs = typeArgs;
			this.targetFqn = targetFqn;
			this.singularizer = singularizer;
		}
		
		public JavacNode getAnnotation() {
			return annotation;
		}
		
		public Name getSingularName() {
			return singularName;
		}
		
		public Name getPluralName() {
			return pluralName;
		}
		
		public List<JCExpression> getTypeArgs() {
			return typeArgs;
		}
		
		public String getTargetFqn() {
			return targetFqn;
		}
		
		public JavacSingularizer getSingularizer() {
			return singularizer;
		}
		
		public String getTargetSimpleType() {
			int idx = targetFqn.lastIndexOf(".");
			return idx == -1 ? targetFqn : targetFqn.substring(idx + 1);
		}
	}
	
	public static abstract class JavacSingularizer {
		public abstract LombokImmutableList<String> getSupportedTypes();
		
		public abstract java.util.List<JavacNode> generateFields(SingularData data, JavacNode builderType, JCTree source);
		public abstract void generateMethods(SingularData data, JavacNode builderType, JCTree source, boolean fluent, boolean chain);
		public abstract void appendBuildCode(SingularData data, JavacNode builderType, JCTree source, ListBuffer<JCStatement> statements, Name targetVariableName);
		
		public boolean requiresCleaning() {
			try {
				return !getClass().getMethod("appendCleaningCode", ListBuffer.class).getDeclaringClass().equals(JavacSingularizer.class);
			} catch (NoSuchMethodException e) {
				return false;
			}
		}
		
		public void appendCleaningCode(SingularData data, JavacNode builderType, JCTree source, ListBuffer<JCStatement> statements) {
		}
		
		// -- Utility methods --
		
		/**
		 * Adds the requested number of type arguments to the provided type, copying each argument in {@code typeArgs}. If typeArgs is too long, the extra elements are ignored.
		 * If {@code typeArgs} is null or too short, {@code java.lang.Object} will be substituted for each missing type argument.
		 * 
		 * @param count The number of type arguments requested.
		 * @param addExtends If {@code true}, all bounds are either '? extends X' or just '?'. If false, the reverse is applied, and '? extends Foo' is converted to Foo, '?' to Object, etc.
		 * @param node Some node in the same AST. Just used to obtain makers and contexts and such.
		 * @param type The type to add generics to.
		 * @param typeArgs the list of type args to clone.
		 * @param source The source annotation that is the root cause of this code generation.
		 */
		protected JCExpression addTypeArgs(int count, boolean addExtends, JavacNode node, JCExpression type, List<JCExpression> typeArgs, JCTree source) {
			JavacTreeMaker maker = node.getTreeMaker();
			Context context = node.getContext();
			
			if (count < 0) throw new IllegalArgumentException("count is negative");
			if (count == 0) return type;
			ListBuffer<JCExpression> arguments = new ListBuffer<JCExpression>();
			
			if (typeArgs != null) for (JCExpression orig : typeArgs) {
				if (!addExtends) {
					if (orig.getKind() == Kind.UNBOUNDED_WILDCARD || orig.getKind() == Kind.SUPER_WILDCARD) {
						arguments.append(chainDots(node, "java", "lang", "Object"));
					} else if (orig.getKind() == Kind.EXTENDS_WILDCARD) {
						JCExpression inner;
						try {
							inner = (JCExpression) ((JCWildcard) orig).inner;
						} catch (Exception e) {
							inner = chainDots(node, "java", "lang", "Object");
						}
						arguments.append(cloneType(maker, inner, source, context));
					} else {
						arguments.append(cloneType(maker, orig, source, context));
					}
				} else {
					if (orig.getKind() == Kind.UNBOUNDED_WILDCARD || orig.getKind() == Kind.SUPER_WILDCARD) {
						arguments.append(maker.Wildcard(maker.TypeBoundKind(BoundKind.UNBOUND), null));
					} else if (orig.getKind() == Kind.EXTENDS_WILDCARD) {
						arguments.append(cloneType(maker, orig, source, context));
					} else {
						arguments.append(maker.Wildcard(maker.TypeBoundKind(BoundKind.EXTENDS), cloneType(maker, orig, source, context)));
					}
				}
				if (--count == 0) break;
			}
			
			while (count-- > 0) {
				if (addExtends) {
					arguments.append(maker.Wildcard(maker.TypeBoundKind(BoundKind.UNBOUND), null));
				} else {
					arguments.append(chainDots(node, "java", "lang", "Object"));
				}
			}
			return maker.TypeApply(type, arguments.toList());
		}
		
		/** Generates 'this.<em>name</em>.size()' as an expression; if nullGuard is true, it's this.name == null ? 0 : this.name.size(). */
		protected JCExpression getSize(JavacTreeMaker maker, JavacNode builderType, Name name, boolean nullGuard) {
			Name thisName = builderType.toName("this");
			JCExpression fn = maker.Select(maker.Select(maker.Ident(thisName), name), builderType.toName("size"));
			JCExpression sizeInvoke = maker.Apply(List.<JCExpression>nil(), fn, List.<JCExpression>nil());
			if (nullGuard) {
				JCExpression isNull = maker.Binary(CTC_EQUAL, maker.Select(maker.Ident(thisName), name), maker.Literal(CTC_BOT, 0));
				return maker.Conditional(isNull, maker.Literal(CTC_INT, 0), sizeInvoke);
			}
			return sizeInvoke;
		}
		
		protected JCExpression cloneParamType(int index, JavacTreeMaker maker, List<JCExpression> typeArgs, JavacNode builderType, JCTree source) {
			if (typeArgs == null || typeArgs.size() <= index) {
				return chainDots(builderType, "java", "lang", "Object");
			} else {
				JCExpression originalType = typeArgs.get(index);
				if (originalType.getKind() == Kind.UNBOUNDED_WILDCARD || originalType.getKind() == Kind.SUPER_WILDCARD) {
					return chainDots(builderType, "java", "lang", "Object");
				} else if (originalType.getKind() == Kind.EXTENDS_WILDCARD) {
					try {
						return cloneType(maker, (JCExpression) ((JCWildcard) originalType).inner, source, builderType.getContext());
					} catch (Exception e) {
						return chainDots(builderType, "java", "lang", "Object");
					}
				} else {
					return cloneType(maker, originalType, source, builderType.getContext());
				}
			}
		}
	}
}