protected void readProperties()

in poi-scratchpad/src/main/java/org/apache/poi/hsmf/datatypes/PropertiesChunk.java [203:317]
82 lines of code
26 McCabe index (conditional complexity)

    protected void readProperties(InputStream value) throws IOException {
        boolean going = true;
        while (going) {
            try {
                // Read in the header
                int typeID = LittleEndian.readUShort(value);
                int id = LittleEndian.readUShort(value);
                long flags = LittleEndian.readUInt(value);

                boolean multivalued = false;
                if ((typeID & Types.MULTIVALUED_FLAG) != 0) {
                    typeID -= Types.MULTIVALUED_FLAG;
                    multivalued = true;
                }

                // Turn the Type and ID into helper objects
                MAPIType type = Types.getById(typeID);
                MAPIProperty prop = MAPIProperty.get(id);

                // Wrap properties we don't know about as custom ones
                if (prop == MAPIProperty.UNKNOWN) {
                    prop = MAPIProperty.createCustom(id, type, "Unknown " + id);
                }
                if (type == null) {
                    LOG.atWarn().log("Invalid type found, expected {} but got {} for property {}",
                            prop.usualType, box(typeID), prop);
                    going = false;
                    break;
                }

                // Sanity check the property's type against the value's type
                if (prop.usualType != type) {
                    // Is it an allowed substitution?
                    if (type == Types.ASCII_STRING
                        && prop.usualType == Types.UNICODE_STRING
                        || type == Types.UNICODE_STRING
                        && prop.usualType == Types.ASCII_STRING) {
                        // It's fine to go with the specified instead of the
                        // normal
                    } else if (prop.usualType == Types.UNKNOWN) {
                        // We don't know what this property normally is, but it
                        // has come
                        // through with a valid type, so use that
                        LOG.atInfo().log("Property definition for {} is missing a type definition, found a value with type {}", prop, type);
                    } else {
                        // Oh dear, something has gone wrong...
                        LOG.atWarn().log("Type mismatch, expected {} but got {} for property {}", prop.usualType, type, prop);
                        going = false;
                        break;
                    }
                }

                // TODO Detect if it is multi-valued, since if it is
                // then even fixed-length strings store their multiple
                // values in another chunk (much as variable length ones)

                // Work out how long the "data" is
                // This might be the actual data, or just a pointer
                // to another chunk which holds the data itself
                boolean isPointer = false;
                int length = type.getLength();
                if (type.isPointer() || multivalued) {
                    isPointer = true;
                    length = 8;
                }

                // Grab the data block
                byte[] data = IOUtils.safelyAllocate(length, MAX_RECORD_LENGTH);
                IOUtils.readFully(value, data);

                // Skip over any padding
                if (length < 8) {
                    byte[] padding = new byte[8 - length];
                    IOUtils.readFully(value, padding);
                }

                // Wrap and store
                PropertyValue propVal;
                if (isPointer) {
                    // We'll match up the chunk later
                    propVal = new ChunkBasedPropertyValue(prop, flags, data, type);
                } else if (type == Types.NULL) {
                    propVal = new NullPropertyValue(prop, flags, data);
                } else if (type == Types.BOOLEAN) {
                    propVal = new BooleanPropertyValue(prop, flags, data);
                } else if (type == Types.SHORT) {
                    propVal = new ShortPropertyValue(prop, flags, data);
                } else if (type == Types.LONG) {
                    propVal = new LongPropertyValue(prop, flags, data);
                } else if (type == Types.LONG_LONG) {
                    propVal = new LongLongPropertyValue(prop, flags, data);
                } else if (type == Types.FLOAT) {
                    propVal = new FloatPropertyValue(prop, flags, data);
                } else if (type == Types.DOUBLE) {
                    propVal = new DoublePropertyValue(prop, flags, data);
                } else if (type == Types.CURRENCY) {
                    propVal = new CurrencyPropertyValue(prop, flags, data);
                } else if (type == Types.TIME) {
                    propVal = new TimePropertyValue(prop, flags, data);
                }
                // TODO Add in the rest of the types
                else {
                    propVal = new PropertyValue(prop, flags, data, type);
                }

                if (properties.get(prop) != null) {
                    LOG.atWarn().log("Duplicate values found for {}", prop);
                }
                properties.put(prop, propVal);
            } catch (BufferUnderrunException e) {
                // Invalid property, ended short
                going = false;
            }
        }
    }