Base class of the light weight implementation of Ion values.
| 32 | * Ion values. |
| 33 | */ |
| 34 | abstract class IonValueLite |
| 35 | implements _Private_IonValue |
| 36 | { |
| 37 | private static final int TYPE_ANNOTATION_HASH_SIGNATURE = |
| 38 | "TYPE ANNOTATION".hashCode(); |
| 39 | |
| 40 | /** |
| 41 | * this hold all the various boolean flags we have |
| 42 | * in a single int. Use set_flag(), clear_flag(), is_true() |
| 43 | * and the associated int flag to check the various flags. |
| 44 | * This is to avoid the overhead java seems to impose |
| 45 | * for a boolean value - it should be a bit, but it seems |
| 46 | * to be an int (4 bytes for 1 bit seems excessive). |
| 47 | */ |
| 48 | protected static final int IS_LOCKED = 0x01; |
| 49 | protected static final int IS_SYSTEM_VALUE = 0x02; |
| 50 | protected static final int IS_NULL_VALUE = 0x04; |
| 51 | protected static final int IS_BOOL_TRUE = 0x08; |
| 52 | protected static final int IS_IVM = 0x10; |
| 53 | protected static final int IS_AUTO_CREATED = 0x20; |
| 54 | protected static final int IS_SYMBOL_PRESENT = 0x40; |
| 55 | /** |
| 56 | * Symbol ID present refers to there being the <i>possibility</i> that the IonValueLite, or it's contained sub graph |
| 57 | * <i>(e.g. if it is a {@link IonContainerLite} based sub type)</i> contains one or more defined |
| 58 | * Symbol ID's (SID)'s. This flag is used to track lifecycle, such that operations that require SID's are purged |
| 59 | * from the IonValueLite and it's contained sub-DOM can conduct a fast evaluation rather than having to do a full |
| 60 | * contained graph traversal on each and every invocation. |
| 61 | */ |
| 62 | protected static final int IS_SYMBOL_ID_PRESENT = 0x80; |
| 63 | |
| 64 | private static final int ELEMENT_MASK = 0xff; |
| 65 | protected static final int ELEMENT_SHIFT = 8; // low 8 bits is flag, upper 24 (or 48 is element id) |
| 66 | |
| 67 | // This value was chosen somewhat arbitrarily; it can/should be changed if it is found to be insufficient. |
| 68 | static final int CONTAINER_STACK_INITIAL_CAPACITY = 16; |
| 69 | |
| 70 | // 'withCharsetAscii' is only specified for consistency with the behavior of the previous implementation of |
| 71 | // toString. Technically users are not allowed to rely on a canonical encoding, but in practice they often do. |
| 72 | private static final IonTextWriterBuilder DEFAULT_TO_STRING_WRITER_BUILDER = |
| 73 | ((_Private_IonTextWriterBuilder) IonTextWriterBuilder.standard()) |
| 74 | .withInvalidSidsAllowed(true) |
| 75 | .withCharsetAscii() |
| 76 | .immutable(); |
| 77 | |
| 78 | |
| 79 | /** |
| 80 | * Used by subclasses to retrieve metadata set by |
| 81 | * {@link #_setMetadata(int, int, int)}. |
| 82 | * @param mask the location of the metadata to retrieve. |
| 83 | * @param shift the number of bits to right-shift the metadata so that |
| 84 | * it starts at bit index 0. |
| 85 | * @return the metadata from _flags at the given mask. |
| 86 | */ |
| 87 | protected final int _getMetadata(int mask, int shift) { |
| 88 | return (_flags & mask) >>> shift; |
| 89 | } |
| 90 | |
| 91 | /** |
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