Java Synthetic类代码示例

import org.apache.bcel.classfile.Synthetic; //导入依赖的package包/类
@Override
public void visit(JavaClass obj) {
    String superclassName = obj.getSuperclassName();
    isSynthetic = superclassName.equals("java.rmi.server.RemoteStub");
    Attribute[] attributes = obj.getAttributes();
    if (attributes != null) {
        for (Attribute a : attributes) {
            if (a instanceof Synthetic) {
                isSynthetic = true;
            }
        }
    }

}
 

import org.apache.bcel.classfile.Synthetic; //导入依赖的package包/类
boolean isSynthetic(FieldOrMethod obj) {
    Attribute[] a = obj.getAttributes();
    for (Attribute aA : a)
        if (aA instanceof Synthetic)
            return true;
    return false;
}
 

import org.apache.bcel.classfile.Synthetic; //导入依赖的package包/类
/**
 * Methods marked with the "Synthetic" attribute do not appear in the source
 * code
 */
private boolean isSynthetic(Method m) {
    if ((m.getAccessFlags() & Constants.ACC_SYNTHETIC) != 0)
        return true;
    Attribute[] attrs = m.getAttributes();
    for (Attribute attr : attrs) {
        if (attr instanceof Synthetic)
            return true;
    }
    return false;
}
 

import org.apache.bcel.classfile.Synthetic; //导入依赖的package包/类
@Override
public void visitCode(Code obj) {
    try {
        String methodName = getMethodName();

        if (!methodName.equals("<init>") && !methodName.equals("clone")
                && ((getMethod().getAccessFlags() & (Constants.ACC_STATIC | Constants.ACC_SYNTHETIC)) == 0)) {

            /*
             * for some reason, access flags doesn't return Synthetic, so do
             * this hocus pocus
             */
            Attribute[] atts = getMethod().getAttributes();
            for (Attribute att : atts) {
                if (att.getClass().equals(Synthetic.class))
                    return;
            }

            byte[] codeBytes = obj.getCode();
            if ((codeBytes.length == 0) || (codeBytes[0] != ALOAD_0))
                return;

            state = State.SEEN_NOTHING;
            invokePC = 0;
            super.visitCode(obj);
            if ((state == State.SEEN_RETURN) && (invokePC != 0)) {
                // Do this check late, as it is potentially expensive
                Method superMethod = findSuperclassMethod(superclassName, getMethod());
                if ((superMethod == null) || accessModifiersAreDifferent(getMethod(), superMethod))
                    return;

                bugReporter.reportBug(new BugInstance(this, "USM_USELESS_SUBCLASS_METHOD", LOW_PRIORITY).addClassAndMethod(
                        this).addSourceLine(this, invokePC));
            }
        }
    } catch (ClassNotFoundException cnfe) {
        bugReporter.reportMissingClass(cnfe);
    }
}
 

import org.apache.bcel.classfile.Synthetic; //导入依赖的package包/类
private boolean isSynthetic(Method m) {
    if (m.isSynthetic())
        return true;
    Attribute[] attrs = m.getAttributes();
    for (Attribute attr : attrs) {
        if (attr instanceof Synthetic)
            return true;
    }
    return false;
}
 

import org.apache.bcel.classfile.Synthetic; //导入依赖的package包/类
public static boolean isSynthetic(FieldOrMethod m) {
    if (m.isSynthetic())
        return true;

    for(Attribute a : m.getAttributes())
        if (a instanceof Synthetic)
            return true;
    return false;
}
 

import org.apache.bcel.classfile.Synthetic; //导入依赖的package包/类
public void visitSynthetic(Synthetic obj){//vmspec2 4.7.6
	checkIndex(obj, obj.getNameIndex(), CONST_Utf8);
	String name = ((ConstantUtf8) cp.getConstant(obj.getNameIndex())).getBytes();
	if (! name.equals("Synthetic")){
		throw new ClassConstraintException("The Synthetic attribute '"+tostring(obj)+"' is not correctly named 'Synthetic' but '"+name+"'.");
	}
}
 

import org.apache.bcel.classfile.Synthetic; //导入依赖的package包/类
@Override
public void visitSynthetic(Synthetic attribute) {
    // printEndMethod(attribute);
}
 

import org.apache.bcel.classfile.Synthetic; //导入依赖的package包/类
public void visit(Synthetic obj) {
    visit((Attribute) obj);
}
 

import org.apache.bcel.classfile.Synthetic; //导入依赖的package包/类
public void visitSynthetic(Synthetic obj) {
    visit(obj);
}
 

import org.apache.bcel.classfile.Synthetic; //导入依赖的package包/类
@Override
public void visitCode(Code obj) {
    try {
        String methodName = getMethodName();

        if (!methodName.equals("<init>") && !methodName.equals("clone")
                && ((getMethod().getAccessFlags() & (Constants.ACC_STATIC | Constants.ACC_SYNTHETIC)) == 0)) {

            /*
             * for some reason, access flags doesn't return Synthetic, so do
             * this hocus pocus
             */
            Attribute[] atts = getMethod().getAttributes();
            for (Attribute att : atts) {
                if (att.getClass().equals(Synthetic.class))
                    return;
            }

            byte[] codeBytes = obj.getCode();
            if ((codeBytes.length == 0) || (codeBytes[0] != ALOAD_0))
                return;

            state = State.SEEN_NOTHING;
            invokePC = 0;
            super.visitCode(obj);
            if ((state == State.SEEN_RETURN) && (invokePC != 0)) {
                // Do this check late, as it is potentially expensive
                Method superMethod = findSuperclassMethod(superclassName, getMethod());
                if ((superMethod == null) || differentAttributes(getMethod(), superMethod)
                        || getMethod().isProtected()
                        && !samePackage(getDottedClassName(), superclassName))
                    return;

                bugReporter.reportBug(new BugInstance(this, "USM_USELESS_SUBCLASS_METHOD", LOW_PRIORITY).addClassAndMethod(
                        this).addSourceLine(this, invokePC));
            }
        }
    } catch (ClassNotFoundException cnfe) {
        bugReporter.reportMissingClass(cnfe);
    }
}
 

import org.apache.bcel.classfile.Synthetic; //导入依赖的package包/类
public void visitJavaClass(JavaClass obj){
	Attribute[] atts = obj.getAttributes();
	boolean foundSourceFile = false;
	boolean foundInnerClasses = false;

	// Is there an InnerClass referenced?
	// This is a costly check; existing verifiers don't do it!
	boolean hasInnerClass = new InnerClassDetector(jc).innerClassReferenced();

	for (int i=0; i<atts.length; i++){
		if ((! (atts[i] instanceof SourceFile)) &&
		    (! (atts[i] instanceof Deprecated))     &&
		    (! (atts[i] instanceof InnerClasses)) &&
		    (! (atts[i] instanceof Synthetic))){
			addMessage("Attribute '"+tostring(atts[i])+"' as an attribute of the ClassFile structure '"+tostring(obj)+"' is unknown and will therefore be ignored.");
		}

		if (atts[i] instanceof SourceFile){
			if (foundSourceFile == false) {
                      foundSourceFile = true;
                  } else {
                      throw new ClassConstraintException("A ClassFile structure (like '"+tostring(obj)+"') may have no more than one SourceFile attribute."); //vmspec2 4.7.7
                  }
		}

		if (atts[i] instanceof InnerClasses){
			if (foundInnerClasses == false) {
                      foundInnerClasses = true;
                  } else{
				if (hasInnerClass){
					throw new ClassConstraintException("A Classfile structure (like '"+tostring(obj)+"') must have exactly one InnerClasses attribute if at least one Inner Class is referenced (which is the case). More than one InnerClasses attribute was found.");
				}
			}
			if (!hasInnerClass){
				addMessage("No referenced Inner Class found, but InnerClasses attribute '"+tostring(atts[i])+"' found. Strongly suggest removal of that attribute.");
			}
		}

	}
	if (hasInnerClass && !foundInnerClasses){
		//throw new ClassConstraintException("A Classfile structure (like '"+tostring(obj)+"') must have exactly one InnerClasses attribute if at least one Inner Class is referenced (which is the case). No InnerClasses attribute was found.");
		//vmspec2, page 125 says it would be a constraint: but existing verifiers
		//don't check it and javac doesn't satisfy it when it comes to anonymous
		//inner classes
		addMessage("A Classfile structure (like '"+tostring(obj)+"') must have exactly one InnerClasses attribute if at least one Inner Class is referenced (which is the case). No InnerClasses attribute was found.");
	}
}
 

import org.apache.bcel.classfile.Synthetic; //导入依赖的package包/类
public void visitField(Field obj){

			if (jc.isClass()){
				int maxone=0;
				if (obj.isPrivate()) {
                    maxone++;
                }
				if (obj.isProtected()) {
                    maxone++;
                }
				if (obj.isPublic()) {
                    maxone++;
                }
				if (maxone > 1){
					throw new ClassConstraintException("Field '"+tostring(obj)+"' must only have at most one of its ACC_PRIVATE, ACC_PROTECTED, ACC_PUBLIC modifiers set.");
				}

				if (obj.isFinal() && obj.isVolatile()){
					throw new ClassConstraintException("Field '"+tostring(obj)+"' must only have at most one of its ACC_FINAL, ACC_VOLATILE modifiers set.");
				}
			}
			else{ // isInterface!
				if (!obj.isPublic()){
					throw new ClassConstraintException("Interface field '"+tostring(obj)+"' must have the ACC_PUBLIC modifier set but hasn't!");
				}
				if (!obj.isStatic()){
					throw new ClassConstraintException("Interface field '"+tostring(obj)+"' must have the ACC_STATIC modifier set but hasn't!");
				}
				if (!obj.isFinal()){
					throw new ClassConstraintException("Interface field '"+tostring(obj)+"' must have the ACC_FINAL modifier set but hasn't!");
				}
			}

			if ((obj.getAccessFlags() & ~(ACC_PUBLIC|ACC_PRIVATE|ACC_PROTECTED|ACC_STATIC|ACC_FINAL|ACC_VOLATILE|ACC_TRANSIENT)) > 0){
				addMessage("Field '"+tostring(obj)+"' has access flag(s) other than ACC_PUBLIC, ACC_PRIVATE, ACC_PROTECTED, ACC_STATIC, ACC_FINAL, ACC_VOLATILE, ACC_TRANSIENT set (ignored).");
			}

			checkIndex(obj, obj.getNameIndex(), CONST_Utf8);

			String name = obj.getName();
			if (! validFieldName(name)){
				throw new ClassConstraintException("Field '"+tostring(obj)+"' has illegal name '"+obj.getName()+"'.");
			}

			// A descriptor is often named signature in BCEL
			checkIndex(obj, obj.getSignatureIndex(), CONST_Utf8);

			String sig  = ((ConstantUtf8) (cp.getConstant(obj.getSignatureIndex()))).getBytes(); // Field or Method signature(=descriptor)

			try{
				Type.getType(sig);  /* Don't need the return value */
			}
			catch (ClassFormatException cfe){
                throw new ClassConstraintException("Illegal descriptor (==signature) '"+sig+"' used by '"+tostring(obj)+"'.");
			}

			String nameanddesc = (name+sig);
			if (field_names_and_desc.contains(nameanddesc)){
				throw new ClassConstraintException("No two fields (like '"+tostring(obj)+"') are allowed have same names and descriptors!");
			}
			if (field_names.contains(name)){
				addMessage("More than one field of name '"+name+"' detected (but with different type descriptors). This is very unusual.");
			}
			field_names_and_desc.add(nameanddesc);
			field_names.add(name);

			Attribute[] atts = obj.getAttributes();
			for (int i=0; i<atts.length; i++){
				if ((! (atts[i] instanceof ConstantValue)) &&
				    (! (atts[i] instanceof Synthetic))     &&
				    (! (atts[i] instanceof Deprecated))){
					addMessage("Attribute '"+tostring(atts[i])+"' as an attribute of Field '"+tostring(obj)+"' is unknown and will therefore be ignored.");
				}
				if  (! (atts[i] instanceof ConstantValue)){
					addMessage("Attribute '"+tostring(atts[i])+"' as an attribute of Field '"+tostring(obj)+"' is not a ConstantValue and is therefore only of use for debuggers and such.");
				}
			}
		}
 

import org.apache.bcel.classfile.Synthetic; //导入依赖的package包/类
public void visitSynthetic(Synthetic obj) {
    tostring = toString(obj);
}
 

import org.apache.bcel.classfile.Synthetic; //导入依赖的package包/类
public void visitSynthetic(Synthetic attribute) {
}