Method modifyFieldIfSet

core/java/android/os/Debug.java:1399–1441

Looks up the property that corresponds to the field, and sets the field's value if the types match.

(final Field field, final TypedProperties properties,
                                         final String propertyName)

     * if the types match.
     */
    private static void modifyFieldIfSet(final Field field, final TypedProperties properties,
                                         final String propertyName) {
        if (field.getType() == java.lang.String.class) {
            int stringInfo = properties.getStringInfo(propertyName);
            switch (stringInfo) {
                case TypedProperties.STRING_SET:
                    // Handle as usual below.
                    break;
                case TypedProperties.STRING_NULL:
                    try {
                        field.set(null, null);  // null object for static fields; null string
                    } catch (IllegalAccessException ex) {
                        throw new IllegalArgumentException(
                            "Cannot set field for " + propertyName, ex);
                    }
                    return;
                case TypedProperties.STRING_NOT_SET:
                    return;
                case TypedProperties.STRING_TYPE_MISMATCH:
                    throw new IllegalArgumentException(
                        "Type of " + propertyName + " " +
                        " does not match field type (" + field.getType() + ")");
                default:
                    throw new IllegalStateException(
                        "Unexpected getStringInfo(" + propertyName + ") return value " +
                        stringInfo);
            }
        }
        Object value = properties.get(propertyName);
        if (value != null) {
            if (!fieldTypeMatches(field, value.getClass())) {
                throw new IllegalArgumentException(
                    "Type of " + propertyName + " (" + value.getClass() + ") " +
                    " does not match field type (" + field.getType() + ")");
            }
            try {
                field.set(null, value);  // null object for static fields
            } catch (IllegalAccessException ex) {
                throw new IllegalArgumentException(
                    "Cannot set field for " + propertyName, ex);
            }
        }
    }


    /**