java.lang.StackWalker.StackFrame#getClassName ( )源码实例Demo

static boolean isFilteredFrame(StackFrame st) {
    // skip logging/logger infrastructure
    if (System.Logger.class.isAssignableFrom(st.getDeclaringClass())) {
        return true;
    }

    // fast escape path: all the prefixes below start with 's' or 'j' and
    // have more than 12 characters.
    final String cname = st.getClassName();
    char c = cname.length() < 12 ? 0 : cname.charAt(0);
    if (c == 's') {
        // skip internal machinery classes
        if (cname.startsWith("sun.util.logging."))   return true;
        if (cname.startsWith("sun.rmi.runtime.Log")) return true;
    } else if (c == 'j') {
        // Message delayed at Bootstrap: no need to go further up.
        if (cname.startsWith("jdk.internal.logger.BootstrapLogger$LogEvent")) return false;
        // skip public machinery classes
        if (cname.startsWith("jdk.internal.logger."))          return true;
        if (cname.startsWith("java.util.logging."))            return true;
        if (cname.startsWith("java.lang.invoke.MethodHandle")) return true;
        if (cname.startsWith("java.security.AccessController")) return true;
    }

    // check additional prefixes if any are specified.
    if (skips.length > 0) {
        for (int i=0; i<skips.length; i++) {
            if (!skips[i].isEmpty() && cname.startsWith(skips[i])) {
                return true;
            }
        }
    }

    return false;
}
 

static boolean isFilteredFrame(StackFrame st) {
    // skip logging/logger infrastructure
    if (System.Logger.class.isAssignableFrom(st.getDeclaringClass())) {
        return true;
    }

    // fast escape path: all the prefixes below start with 's' or 'j' and
    // have more than 12 characters.
    final String cname = st.getClassName();
    char c = cname.length() < 12 ? 0 : cname.charAt(0);
    if (c == 's') {
        // skip internal machinery classes
        if (cname.startsWith("sun.util.logging."))   return true;
        if (cname.startsWith("sun.rmi.runtime.Log")) return true;
    } else if (c == 'j') {
        // Message delayed at Bootstrap: no need to go further up.
        if (cname.startsWith("jdk.internal.logger.BootstrapLogger$LogEvent")) return false;
        // skip public machinery classes
        if (cname.startsWith("jdk.internal.logger."))          return true;
        if (cname.startsWith("java.util.logging."))            return true;
        if (cname.startsWith("java.lang.invoke.MethodHandle")) return true;
        if (cname.startsWith("java.security.AccessController")) return true;
    }

    // check additional prefixes if any are specified.
    if (skips.length > 0) {
        for (int i=0; i<skips.length; i++) {
            if (!skips[i].isEmpty() && cname.startsWith(skips[i])) {
                return true;
            }
        }
    }

    return false;
}
 

void checkFrame(StackFrame frame) {
    String cn = frame.getClassName();
    if (cn.startsWith("java.lang.reflect.") || cn.startsWith("jdk.internal.reflect.")) {
        reflects.add(frame);
    }
    if (cn.contains("$$Lambda$")) {
        lambdas.add(frame);
    }
}
 

public String frame(StackFrame f) {
    return f.getClassName() + "::" + f.getMethodName();
}
 

/**
 * Compare the given StackFrame returned from the StackWalker to the
 * recorded frame at the given index.
 *
 * Tests for equality, as well as functional correctness with respect to
 * the StackWalker's options (e.g. throws or doesn't throw exceptions)
 */
public void compareFrame(int index, StackFrame sf) {
    TestFrame tf = testFrames.get(index);
    if (compareClasses) {
        if (!tf.declaringClass.equals(sf.getDeclaringClass())) {
            throw new RuntimeException("Expected class: " +
              tf.declaringClass.toString() + ", but got: " +
              sf.getDeclaringClass().toString());
        }
    } else {
        boolean caught = false;
        try {
            sf.getDeclaringClass();
        } catch (UnsupportedOperationException e) {
            caught = true;
        }
        if (!caught) {
            throw new RuntimeException("StackWalker did not have " +
              "RETAIN_CLASS_REFERENCE Option, but did not throw " +
              "UnsupportedOperationException");
        }
    }

    if (compareClassNames && !tf.className().equals(sf.getClassName())) {
        throw new RuntimeException("Expected class name: " + tf.className() +
                ", but got: " + sf.getClassName());
    }
    if (compareMethodNames && !tf.methodName.equals(sf.getMethodName())) {
        throw new RuntimeException("Expected method name: " + tf.methodName +
                ", but got: " + sf.getMethodName());
    }
    if (compareSTEs) {
        StackTraceElement ste = sf.toStackTraceElement();
        if (!(ste.getClassName().equals(tf.className()) &&
              ste.getMethodName().equals(tf.methodName)) &&
              ste.getFileName().equals(tf.fileName)) {
            throw new RuntimeException("Expected StackTraceElement info: " +
                    tf + ", but got: " + ste);
        }
        if (!Objects.equals(ste.getClassName(), sf.getClassName())
            || !Objects.equals(ste.getMethodName(), sf.getMethodName())
            || !Objects.equals(ste.getFileName(), sf.getFileName())
            || !Objects.equals(ste.getLineNumber(), sf.getLineNumber())
            || !Objects.equals(ste.isNativeMethod(), sf.isNativeMethod())) {
            throw new RuntimeException("StackFrame and StackTraceElement differ: " +
                    "sf=" + sf + ", ste=" + ste);
        }
    }
}
 

public String frame(StackFrame f) {
    return f.getClassName() + "::" + f.getMethodName();
}
 

private static boolean isExitStackFrame(StackFrame f) {
  final String methodName = f.getMethodName(), className = f.getClassName();
  return ("exit".equals(methodName) || "halt".equals(methodName)) &&
      (SYSTEM_CLASS_NAME.equals(className) || RUNTIME_CLASS_NAME.equals(className));
}