Java ClassDefinition.superClassOf方法代码示例

import sun.tools.java.ClassDefinition; //导入方法依赖的package包/类
/**
 * Compute the exceptions which need to be caught and rethrown in a
 * stub method before wrapping Exceptions in UnexpectedExceptions,
 * given the exceptions declared in the throws clause of the method.
 * Returns a Vector containing ClassDefinition objects for each
 * exception to catch.  Each exception is guaranteed to be unique,
 * i.e. not a subclass of any of the other exceptions in the Vector,
 * so the catch blocks for these exceptions may be generated in any
 * order relative to each other.
 *
 * RemoteException and RuntimeException are each automatically placed
 * in the returned Vector (if none of their superclasses are already
 * present), since those exceptions should always be directly rethrown
 * by a stub method.
 *
 * The returned Vector will be empty if java.lang.Exception or one
 * of its superclasses is in the throws clause of the method, indicating
 * that no exceptions need to be caught.
 */
private Vector<ClassDefinition> computeUniqueCatchList(ClassDeclaration[] exceptions) {
    Vector<ClassDefinition> uniqueList = new Vector<>();       // unique exceptions to catch

    uniqueList.addElement(defRuntimeException);
    uniqueList.addElement(defRemoteException);

    /* For each exception declared by the stub method's throws clause: */
nextException:
    for (int i = 0; i < exceptions.length; i++) {
        ClassDeclaration decl = exceptions[i];
        try {
            if (defException.subClassOf(env, decl)) {
                /*
                 * (If java.lang.Exception (or a superclass) was declared
                 * in the throws clause of this stub method, then we don't
                 * have to bother catching anything; clear the list and
                 * return.)
                 */
                uniqueList.clear();
                break;
            } else if (!defException.superClassOf(env, decl)) {
                /*
                 * Ignore other Throwables that do not extend Exception,
                 * since they do not need to be caught anyway.
                 */
                continue;
            }
            /*
             * Compare this exception against the current list of
             * exceptions that need to be caught:
             */
            for (int j = 0; j < uniqueList.size();) {
                ClassDefinition def = uniqueList.elementAt(j);
                if (def.superClassOf(env, decl)) {
                    /*
                     * If a superclass of this exception is already on
                     * the list to catch, then ignore and continue;
                     */
                    continue nextException;
                } else if (def.subClassOf(env, decl)) {
                    /*
                     * If a subclass of this exception is on the list
                     * to catch, then remove it.
                     */
                    uniqueList.removeElementAt(j);
                } else {
                    j++;    // else continue comparing
                }
            }
            /* This exception is unique: add it to the list to catch. */
            uniqueList.addElement(decl.getClassDefinition(env));
        } catch (ClassNotFound e) {
            env.error(0, "class.not.found", e.name, decl.getName());
            /*
             * REMIND: We do not exit from this exceptional condition,
             * generating questionable code and likely letting the
             * compiler report a resulting error later.
             */
        }
    }
    return uniqueList;
}
 

import sun.tools.java.ClassDefinition; //导入方法依赖的package包/类
/**
 * Return an array containing only those exceptions which
 * need to be caught.  Removes java.rmi.RemoteException,
 * java.lang.RuntimeException, java.lang.Error, and their
 * subclasses, then removes any exceptions which are more
 * derived than another in the list. Returns null if no
 * exceptions need to be caught.
 */
public ValueType[] getUniqueCatchList(ValueType[] list) {
    ValueType[] result = list;
    int newSize = list.length;

    try {

        // First, remove RemoteException, RuntimeException, Error, and their subclasses...
        for (int i = 0; i < list.length; i++) {
            ClassDeclaration decl = list[i].getClassDeclaration();
            if (env.defRemoteException.superClassOf(env, decl) ||
                env.defRuntimeException.superClassOf(env, decl) ||
                env.defError.superClassOf(env, decl)) {
                list[i] = null;
                newSize--;
            }
        }

        // Now remove derived types...
        for (int i = 0; i < list.length; i++) {
            if (list[i] != null) {
                ClassDefinition current = list[i].getClassDefinition();
                for (int j = 0; j < list.length; j++) {
                    if (j != i && list[i] != null && list[j] != null &&
                        current.superClassOf(env, list[j].getClassDeclaration())) {
                        list[j] = null;
                        newSize--;
                    }
                }
            }
        }

    } catch (ClassNotFound e) {
        classNotFound(stack,e); // Report error but do not stop.
    }

    // Create new list if we removed anything...

    if (newSize < list.length) {
        ValueType[] temp = new ValueType[newSize];
        int offset = 0;
        for (int i = 0; i < list.length; i++) {
            if (list[i] != null) {
                temp[offset++] = list[i];
            }
        }
        list = temp;
    }

    if (list.length == 0) {
        return null;
    } else {
        return list;
    }
}