public StackTraceElement deserialize()

in log4j-core-java9/src/main/java/org/apache/logging/log4j/core/jackson/Log4jStackTraceElementDeserializer.java [46:115]
66 lines of code
13 McCabe index (conditional complexity)

    public StackTraceElement deserialize(final JsonParser jp, final DeserializationContext ctxt) throws IOException {
        JsonToken t = jp.getCurrentToken();
        // Must get an Object
        if (t == JsonToken.START_OBJECT) {
            String classLoaderName = null,
                    moduleName = null,
                    moduleVersion = null,
                    className = null,
                    methodName = null,
                    fileName = null;
            int lineNumber = -1;

            while ((t = jp.nextValue()) != JsonToken.END_OBJECT) {
                final String propName = jp.getCurrentName();
                switch (propName) {
                    case StackTraceElementConstants.ATTR_CLASS: {
                        className = jp.getText();
                        break;
                    }
                    case StackTraceElementConstants.ATTR_FILE: {
                        fileName = jp.getText();
                        break;
                    }
                    case StackTraceElementConstants.ATTR_LINE: {
                        if (t.isNumeric()) {
                            lineNumber = jp.getIntValue();
                        } else {
                            // An XML number always comes in a string since there is no syntax help as with JSON.
                            try {
                                lineNumber = Integers.parseInt(jp.getText());
                            } catch (final NumberFormatException e) {
                                throw JsonMappingException.from(
                                        jp, "Non-numeric token (" + t + ") for property 'line'", e);
                            }
                        }
                        break;
                    }
                    case StackTraceElementConstants.ATTR_METHOD: {
                        methodName = jp.getText();
                        break;
                    }
                    case "nativeMethod": {
                        // no setter, not passed via constructor: ignore
                        break;
                    }
                    case StackTraceElementConstants.ATTR_CLASS_LOADER_NAME: {
                        classLoaderName = jp.getText();
                        break;
                    }
                    case StackTraceElementConstants.ATTR_MODULE: {
                        moduleName = jp.getText();
                        break;
                    }
                    case StackTraceElementConstants.ATTR_MODULE_VERSION: {
                        moduleVersion = jp.getText();
                        break;
                    }
                    default: {
                        this.handleUnknownProperty(jp, ctxt, this._valueClass, propName);
                    }
                }
            }
            return new StackTraceElement(
                    classLoaderName, moduleName, moduleVersion, className, methodName, fileName, lineNumber);
        }
        throw JsonMappingException.from(
                jp,
                String.format(
                        "Cannot deserialize instance of %s out of %s token", ClassUtil.nameOf(this._valueClass), t));
    }