com.redhat.ceylon.langtools.tools.javac.code.AnnoConstruct Maven / Gradle / Ivy
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package com.redhat.ceylon.langtools.tools.javac.code;
import java.lang.annotation.Annotation;
import java.lang.annotation.Inherited;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import com.redhat.ceylon.javax.lang.model.AnnotatedConstruct;
import com.redhat.ceylon.langtools.tools.javac.model.AnnotationProxyMaker;
import com.redhat.ceylon.langtools.tools.javac.util.List;
import com.redhat.ceylon.langtools.tools.javac.util.ListBuffer;
/**
* Common super type for annotated constructs such as Types and Symbols.
*
* This class should *not* contain any fields since it would have a significant
* impact on the javac memory footprint.
*
* This is NOT part of any supported API.
* If you write code that depends on this, you do so at your own
* risk. This code and its internal interfaces are subject to change
* or deletion without notice.
*/
public abstract class AnnoConstruct implements AnnotatedConstruct {
// Override to enforce a narrower return type.
@Override
public abstract List getAnnotationMirrors();
// This method is part of the com.redhat.ceylon.javax.lang.model API, do not use this in javac code.
protected Attribute.Compound getAttribute(Class annoType) {
String name = annoType.getName();
for (Attribute.Compound anno : getAnnotationMirrors()) {
if (name.equals(anno.type.tsym.flatName().toString()))
return anno;
}
return null;
}
@SuppressWarnings("unchecked")
protected A[] getInheritedAnnotations(Class annoType) {
return (A[]) java.lang.reflect.Array.newInstance(annoType, 0); // annoType is the Class for A
}
// This method is part of the com.redhat.ceylon.javax.lang.model API, do not use this in javac code.
public A[] getAnnotationsByType(Class annoType) {
if (!annoType.isAnnotation())
throw new IllegalArgumentException("Not an annotation type: "
+ annoType);
// If annoType does not declare a container this is equivalent to wrapping
// getAnnotation(...) in an array.
Class containerType = getContainer(annoType);
if (containerType == null) {
A res = getAnnotation(annoType);
int size = res == null ? 0 : 1;
@SuppressWarnings("unchecked") // annoType is the Class for A
A[] arr = (A[])java.lang.reflect.Array.newInstance(annoType, size);
if (res != null)
arr[0] = res;
return arr;
}
// So we have a containing type
String annoTypeName = annoType.getName();
String containerTypeName = containerType.getName();
int directIndex = -1, containerIndex = -1;
Attribute.Compound direct = null, container = null;
// Find directly (explicit or implicit) present annotations
int index = -1;
for (Attribute.Compound attribute : getAnnotationMirrors()) {
index++;
if (attribute.type.tsym.flatName().contentEquals(annoTypeName)) {
directIndex = index;
direct = attribute;
} else if(containerTypeName != null &&
attribute.type.tsym.flatName().contentEquals(containerTypeName)) {
containerIndex = index;
container = attribute;
}
}
// Deal with inherited annotations
if (direct == null && container == null &&
annoType.isAnnotationPresent(Inherited.class))
return getInheritedAnnotations(annoType);
Attribute.Compound[] contained = unpackContained(container);
// In case of an empty legacy container we might need to look for
// inherited annos as well
if (direct == null && contained.length == 0 &&
annoType.isAnnotationPresent(Inherited.class))
return getInheritedAnnotations(annoType);
int size = (direct == null ? 0 : 1) + contained.length;
@SuppressWarnings("unchecked") // annoType is the Class for A
A[] arr = (A[])java.lang.reflect.Array.newInstance(annoType, size);
// if direct && container, which is first?
int insert = -1;
int length = arr.length;
if (directIndex >= 0 && containerIndex >= 0) {
if (directIndex < containerIndex) {
arr[0] = AnnotationProxyMaker.generateAnnotation(direct, annoType);
insert = 1;
} else {
arr[arr.length - 1] = AnnotationProxyMaker.generateAnnotation(direct, annoType);
insert = 0;
length--;
}
} else if (directIndex >= 0) {
arr[0] = AnnotationProxyMaker.generateAnnotation(direct, annoType);
return arr;
} else {
// Only container
insert = 0;
}
for (int i = 0; i + insert < length; i++)
arr[insert + i] = AnnotationProxyMaker.generateAnnotation(contained[i], annoType);
return arr;
}
private Attribute.Compound[] unpackContained(Attribute.Compound container) {
// Pack them in an array
Attribute[] contained0 = null;
if (container != null)
contained0 = unpackAttributes(container);
ListBuffer compounds = new ListBuffer<>();
if (contained0 != null) {
for (Attribute a : contained0)
if (a instanceof Attribute.Compound)
compounds = compounds.append((Attribute.Compound)a);
}
return compounds.toArray(new Attribute.Compound[compounds.size()]);
}
// This method is part of the com.redhat.ceylon.javax.lang.model API, do not use this in javac code.
public A getAnnotation(Class annoType) {
if (!annoType.isAnnotation())
throw new IllegalArgumentException("Not an annotation type: " + annoType);
Attribute.Compound c = getAttribute(annoType);
return c == null ? null : AnnotationProxyMaker.generateAnnotation(c, annoType);
}
// Needed to unpack the runtime view of containing annotations
private static final Class REPEATABLE_CLASS = initRepeatable();
private static final Method VALUE_ELEMENT_METHOD = initValueElementMethod();
private static Class initRepeatable() {
try {
// Repeatable will not be available when bootstrapping on
// JDK 7 so use a reflective lookup instead of a class
// literal for Repeatable.class.
return Class.forName("java.lang.annotation.Repeatable").asSubclass(Annotation.class);
} catch (ClassNotFoundException | SecurityException e) {
return null;
}
}
private static Method initValueElementMethod() {
if (REPEATABLE_CLASS == null)
return null;
Method m = null;
try {
m = REPEATABLE_CLASS.getMethod("value");
if (m != null)
m.setAccessible(true);
return m;
} catch (NoSuchMethodException e) {
return null;
}
}
// Helper to getAnnotationsByType
private static Class getContainer(Class annoType) {
// Since we can not refer to java.lang.annotation.Repeatable until we are
// bootstrapping with java 8 we need to get the Repeatable annotation using
// reflective invocations instead of just using its type and element method.
if (REPEATABLE_CLASS != null &&
VALUE_ELEMENT_METHOD != null) {
// Get the Repeatable instance on the annotations declaration
Annotation repeatable = (Annotation)annoType.getAnnotation(REPEATABLE_CLASS);
if (repeatable != null) {
try {
// Get the value element, it should be a class
// indicating the containing annotation type
@SuppressWarnings("unchecked")
Class containerType = (Class)VALUE_ELEMENT_METHOD.invoke(repeatable);
if (containerType == null)
return null;
return containerType;
} catch (ClassCastException | IllegalAccessException | InvocationTargetException e) {
return null;
}
}
}
return null;
}
// Helper to getAnnotationsByType
private static Attribute[] unpackAttributes(Attribute.Compound container) {
// We now have an instance of the container,
// unpack it returning an instance of the
// contained type or null
return ((Attribute.Array)container.member(container.type.tsym.name.table.names.value)).values;
}
}
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