Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance. Project price only 1 $
You can buy this project and download/modify it how often you want.
/*
* Copyright 2014 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.auto.common;
import static com.google.auto.common.MoreTypes.asTypeElement;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Iterables;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.AnnotationValue;
import javax.lang.model.element.AnnotationValueVisitor;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.VariableElement;
import javax.lang.model.type.TypeMirror;
import javax.lang.model.util.SimpleAnnotationValueVisitor8;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* Handling of default values for annotation members.
*
* @author [email protected] (Éamonn McManus)
*/
final class AnnotationOutput {
private AnnotationOutput() {} // There are no instances of this class.
/**
* Visitor that produces a string representation of an annotation value, suitable for inclusion in
* a Java source file as an annotation member or as the initializer of a variable of the
* appropriate type. The syntax for the two is the same except for annotation members that are
* themselves annotations. Within an annotation, an annotation member can be written as
* {@code @NestedAnnotation(...)}, while in an initializer it must be written as an object, for
* example the construction of an {@code @AutoAnnotation} class. That's why we have this abstract
* class and two concrete subclasses.
*/
private static class SourceFormVisitor
extends SimpleAnnotationValueVisitor8<@Nullable Void, StringBuilder> {
private String formatType(TypeMirror typeMirror) {
return asTypeElement(typeMirror).getQualifiedName().toString();
}
@Override
protected @Nullable Void defaultAction(Object value, StringBuilder sb) {
sb.append(value);
return null;
}
@Override
public @Nullable Void visitArray(List values, StringBuilder sb) {
sb.append('{');
String sep = "";
for (AnnotationValue value : values) {
sb.append(sep);
visit(value, sb);
sep = ", ";
}
sb.append('}');
return null;
}
@Override
public @Nullable Void visitByte(byte b, StringBuilder sb) {
sb.append("(byte) ").append(b);
return null;
}
@Override
public @Nullable Void visitShort(short s, StringBuilder sb) {
sb.append("(short) ").append(s);
return null;
}
@Override
public @Nullable Void visitChar(char c, StringBuilder sb) {
appendQuoted(sb, c);
return null;
}
@Override
public @Nullable Void visitLong(long i, StringBuilder sb) {
sb.append(i).append('L');
return null;
}
@Override
public @Nullable Void visitDouble(double d, StringBuilder sb) {
if (Double.isNaN(d)) {
sb.append("Double.NaN");
} else if (d == Double.POSITIVE_INFINITY) {
sb.append("Double.POSITIVE_INFINITY");
} else if (d == Double.NEGATIVE_INFINITY) {
sb.append("Double.NEGATIVE_INFINITY");
} else {
sb.append(d);
}
return null;
}
@Override
public @Nullable Void visitFloat(float f, StringBuilder sb) {
if (Float.isNaN(f)) {
sb.append("Float.NaN");
} else if (f == Float.POSITIVE_INFINITY) {
sb.append("Float.POSITIVE_INFINITY");
} else if (f == Float.NEGATIVE_INFINITY) {
sb.append("Float.NEGATIVE_INFINITY");
} else {
sb.append(f).append('F');
}
return null;
}
@Override
public @Nullable Void visitEnumConstant(VariableElement c, StringBuilder sb) {
sb.append(formatType(c.asType())).append('.').append(c.getSimpleName());
return null;
}
@Override
public @Nullable Void visitString(String s, StringBuilder sb) {
appendQuoted(sb, s);
return null;
}
@Override
public @Nullable Void visitType(TypeMirror classConstant, StringBuilder sb) {
sb.append(formatType(classConstant)).append(".class");
return null;
}
@Override
public @Nullable Void visitAnnotation(AnnotationMirror a, StringBuilder sb) {
sb.append('@').append(formatType(a.getAnnotationType()));
ImmutableMap map =
ImmutableMap.copyOf(a.getElementValues());
if (!map.isEmpty()) {
sb.append('(');
Optional shortForm = shortForm(map);
if (shortForm.isPresent()) {
this.visit(maybeShorten(shortForm.get()), sb);
} else {
String sep = "";
for (Map.Entry entry : map.entrySet()) {
sb.append(sep).append(entry.getKey().getSimpleName()).append(" = ");
sep = ", ";
this.visit(maybeShorten(entry.getValue()), sb);
}
}
sb.append(')');
}
return null;
}
}
private static AnnotationValue maybeShorten(AnnotationValue value) {
return ARRAY_VISITOR.visit(value, value);
}
private static final AnnotationValueVisitor ARRAY_VISITOR =
new SimpleAnnotationValueVisitor8() {
@Override
public AnnotationValue visitArray(
List values, AnnotationValue input) {
if (values.size() == 1) {
// We can shorten @Foo(a = {23}) to @Foo(a = 23). For the specific case where `a` is
// actually `value`, we'll already have shortened that in visitAnnotation, so
// effectively we go from @Foo(value = {23}) to @Foo({23}) to @Foo(23).
return Iterables.getOnlyElement(values);
}
return input;
}
@Override
protected AnnotationValue defaultAction(Object o, AnnotationValue input) {
return input;
}
};
// We can shorten @Annot(value = 23) to @Annot(23).
private static Optional shortForm(
Map values) {
if (values.size() == 1
&& Iterables.getOnlyElement(values.keySet()).getSimpleName().contentEquals("value")) {
return Optional.of(Iterables.getOnlyElement(values.values()));
}
return Optional.empty();
}
/**
* Returns a string representation of the given annotation value, suitable for inclusion in a Java
* source file as the initializer of a variable of the appropriate type.
*/
static String toString(AnnotationValue annotationValue) {
StringBuilder sb = new StringBuilder();
new SourceFormVisitor().visit(annotationValue, sb);
return sb.toString();
}
/**
* Returns a string representation of the given annotation mirror, suitable for inclusion in a
* Java source file to reproduce the annotation in source form.
*/
static String toString(AnnotationMirror annotationMirror) {
StringBuilder sb = new StringBuilder();
new SourceFormVisitor().visitAnnotation(annotationMirror, sb);
return sb.toString();
}
private static StringBuilder appendQuoted(StringBuilder sb, String s) {
sb.append('"');
for (int i = 0; i < s.length(); i++) {
appendEscaped(sb, s.charAt(i));
}
return sb.append('"');
}
private static StringBuilder appendQuoted(StringBuilder sb, char c) {
sb.append('\'');
appendEscaped(sb, c);
return sb.append('\'');
}
private static void appendEscaped(StringBuilder sb, char c) {
switch (c) {
case '\\':
case '"':
case '\'':
sb.append('\\').append(c);
break;
case '\n':
sb.append("\\n");
break;
case '\r':
sb.append("\\r");
break;
case '\t':
sb.append("\\t");
break;
default:
if (c < 0x20) {
sb.append(String.format("\\%03o", (int) c));
} else if (c < 0x7f || Character.isLetter(c)) {
sb.append(c);
} else {
sb.append(String.format("\\u%04x", (int) c));
}
break;
}
}
}
