scouter.javassist.CtMember Maven / Gradle / Ivy
/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. Alternatively, the contents of this file may be used under
* the terms of the GNU Lesser General Public License Version 2.1 or later,
* or the Apache License Version 2.0.
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*/
package scouter.javassist;
import scouter.javassist.CtClass;
import scouter.javassist.CtConstructor;
import scouter.javassist.CtMethod;
import scouter.javassist.Modifier;
/**
* An instance of CtMember represents a field, a constructor,
* or a method.
*/
public abstract class CtMember {
CtMember next; // for internal use
protected CtClass declaringClass;
/* Make a circular link of CtMembers declared in the
* same class so that they are garbage-collected together
* at the same time.
*/
static class Cache extends CtMember {
protected void extendToString(StringBuffer buffer) {}
public boolean hasAnnotation(String clz) { return false; }
public Object getAnnotation(Class clz)
throws ClassNotFoundException { return null; }
public Object[] getAnnotations()
throws ClassNotFoundException { return null; }
public byte[] getAttribute(String name) { return null; }
public Object[] getAvailableAnnotations() { return null; }
public int getModifiers() { return 0; }
public String getName() { return null; }
public String getSignature() { return null; }
public void setAttribute(String name, byte[] data) {}
public void setModifiers(int mod) {}
public String getGenericSignature() { return null; }
public void setGenericSignature(String sig) {}
private CtMember methodTail;
private CtMember consTail; // constructor tail
private CtMember fieldTail;
Cache(CtClassType decl) {
super(decl);
methodTail = this;
consTail = this;
fieldTail = this;
fieldTail.next = this;
}
CtMember methodHead() { return this; }
CtMember lastMethod() { return methodTail; }
CtMember consHead() { return methodTail; } // may include a static initializer
CtMember lastCons() { return consTail; }
CtMember fieldHead() { return consTail; }
CtMember lastField() { return fieldTail; }
void addMethod(CtMember method) {
method.next = methodTail.next;
methodTail.next = method;
if (methodTail == consTail) {
consTail = method;
if (methodTail == fieldTail)
fieldTail = method;
}
methodTail = method;
}
/* Both constructors and a class initializer.
*/
void addConstructor(CtMember cons) {
cons.next = consTail.next;
consTail.next = cons;
if (consTail == fieldTail)
fieldTail = cons;
consTail = cons;
}
void addField(CtMember field) {
field.next = this; // or fieldTail.next
fieldTail.next = field;
fieldTail = field;
}
static int count(CtMember head, CtMember tail) {
int n = 0;
while (head != tail) {
n++;
head = head.next;
}
return n;
}
void remove(CtMember mem) {
CtMember m = this;
CtMember node;
while ((node = m.next) != this) {
if (node == mem) {
m.next = node.next;
if (node == methodTail)
methodTail = m;
if (node == consTail)
consTail = m;
if (node == fieldTail)
fieldTail = m;
break;
}
else
m = m.next;
}
}
}
protected CtMember(CtClass clazz) {
declaringClass = clazz;
next = null;
}
final CtMember next() { return next; }
/**
* This method is invoked when setName() or replaceClassName()
* in CtClass is called.
*
* @see CtMethod#nameReplaced()
*/
void nameReplaced() {}
public String toString() {
StringBuffer buffer = new StringBuffer(getClass().getName());
buffer.append("@");
buffer.append(Integer.toHexString(hashCode()));
buffer.append("[");
buffer.append(Modifier.toString(getModifiers()));
extendToString(buffer);
buffer.append("]");
return buffer.toString();
}
/**
* Invoked by {@link #toString()} to add to the buffer and provide the
* complete value. Subclasses should invoke this method, adding a
* space before each token. The modifiers for the member are
* provided first; subclasses should provide additional data such
* as return type, field or method name, etc.
*/
protected abstract void extendToString(StringBuffer buffer);
/**
* Returns the class that declares this member.
*/
public CtClass getDeclaringClass() { return declaringClass; }
/**
* Returns true if this member is accessible from the given class.
*/
public boolean visibleFrom(CtClass clazz) {
int mod = getModifiers();
if (Modifier.isPublic(mod))
return true;
else if (Modifier.isPrivate(mod))
return clazz == declaringClass;
else { // package or protected
String declName = declaringClass.getPackageName();
String fromName = clazz.getPackageName();
boolean visible;
if (declName == null)
visible = fromName == null;
else
visible = declName.equals(fromName);
if (!visible && Modifier.isProtected(mod))
return clazz.subclassOf(declaringClass);
return visible;
}
}
/**
* Obtains the modifiers of the member.
*
* @return modifiers encoded with
* javassist.Modifier.
* @see Modifier
*/
public abstract int getModifiers();
/**
* Sets the encoded modifiers of the member.
*
* @see Modifier
*/
public abstract void setModifiers(int mod);
/**
* Returns true if the class has the specified annotation type.
*
* @param clz the annotation type.
* @return true if the annotation is found, otherwise false.
* @since 3.11
*/
public boolean hasAnnotation(Class clz) {
return hasAnnotation(clz.getName());
}
/**
* Returns true if the class has the specified annotation type.
*
* @param annotationTypeName the name of annotation type.
* @return true if the annotation is found, otherwise false.
* @since 3.21
*/
public abstract boolean hasAnnotation(String annotationTypeName);
/**
* Returns the annotation if the class has the specified annotation type.
* For example, if an annotation @Author is associated
* with this member, an Author object is returned.
* The member values can be obtained by calling methods on
* the Author object.
*
* @param annotationType the annotation type.
* @return the annotation if found, otherwise null.
* @since 3.11
*/
public abstract Object getAnnotation(Class annotationType) throws ClassNotFoundException;
/**
* Returns the annotations associated with this member.
* For example, if an annotation @Author is associated
* with this member, the returned array contains an Author
* object. The member values can be obtained by calling methods on
* the Author object.
*
* @return an array of annotation-type objects.
* @see CtClass#getAnnotations()
*/
public abstract Object[] getAnnotations() throws ClassNotFoundException;
/**
* Returns the annotations associated with this member.
* This method is equivalent to getAnnotations()
* except that, if any annotations are not on the classpath,
* they are not included in the returned array.
*
* @return an array of annotation-type objects.
* @see #getAnnotations()
* @see CtClass#getAvailableAnnotations()
* @since 3.3
*/
public abstract Object[] getAvailableAnnotations();
/**
* Obtains the name of the member.
*
* As for constructor names, see getName()
* in CtConstructor.
*
* @see CtConstructor#getName()
*/
public abstract String getName();
/**
* Returns the character string representing the signature of the member.
* If two members have the same signature (parameter types etc.),
* getSignature() returns the same string.
*/
public abstract String getSignature();
/**
* Returns the generic signature of the member.
*
* @see scouter.javassist.bytecode.SignatureAttribute#toFieldSignature(String)
* @see scouter.javassist.bytecode.SignatureAttribute#toMethodSignature(String)
* @see CtClass#getGenericSignature()
* @since 3.17
*/
public abstract String getGenericSignature();
/**
* Sets the generic signature of the member.
*
* @param sig a new generic signature.
* @see scouter.javassist.bytecode.SignatureAttribute.ObjectType#encode()
* @see scouter.javassist.bytecode.SignatureAttribute.MethodSignature#encode()
* @see CtClass#setGenericSignature(String)
* @since 3.17
*/
public abstract void setGenericSignature(String sig);
/**
* Obtains a user-defined attribute with the given name.
* If that attribute is not found in the class file, this
* method returns null.
*
*
Note that an attribute is a data block specified by
* the class file format.
* See {@link scouter.javassist.bytecode.AttributeInfo}.
*
* @param name attribute name
*/
public abstract byte[] getAttribute(String name);
/**
* Adds a user-defined attribute. The attribute is saved in the class file.
*
*
Note that an attribute is a data block specified by
* the class file format.
* See {@link scouter.javassist.bytecode.AttributeInfo}.
*
* @param name attribute name
* @param data attribute value
*/
public abstract void setAttribute(String name, byte[] data);
}