Examples of com.persistit.Value$Version

com.persistit.Value
Holds a collection of Object values associated with their position within the serialized Value. Used only during get and put operations so that reference graphs with cycles can be encoded and decoded properly. A Persistit instance has a collection of ValueCache objects that get() and put() operations allocate and relinquish when done.

            try {
                Exchange ex = setupExchange();
                if (ex.getKey().getEncodedSize() == 0)
                    return "";
                ex.fetch();
                Value value = ex.getValue();
                if (value.getEncodedSize() > 50000) {
                    return "Too long to display: " + value.getEncodedSize();
                } else {
                    return value.toString();
                }
            } catch (PersistitException de) {
                return de.toString();
            }
        }

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            try {
                final Exchange ex = setupExchange();
                if (ex.getKey().getEncodedSize() == 0)
                    return "";
                ex.fetch();
                final Value value = ex.getValue();
                if (!value.isDefined())
                    return "undefined";
                return value.getType().getName();
            } catch (final PersistitException de) {
                return de.toString();
            }
        }

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            try {
                final Exchange ex = setupExchange();
                if (ex.getKey().getEncodedSize() == 0)
                    return "";
                ex.fetch();
                final Value value = ex.getValue();
                if (value.getEncodedSize() > 50000) {
                    return "Too long to display: " + value.getEncodedSize();
                } else {
                    return value.toString();
                }
            } catch (final PersistitException de) {
                return de.toString();
            }
        }

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    class ValueStateRenderer extends AlignedCellRenderer {
        private final Value _value;


        public ValueStateRenderer() {
            super(SwingConstants.LEFT);
            _value = new Value((Persistit) null);
        }

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        public List<KeyState> sortKeys;
        public Value rowValue;
     
        public SortKey () {
            this.sortKeys = new ArrayList<>();
            this.rowValue = new Value((Persistit)null);
            rowValue.clear();
        }

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        }
        
        private Value readValue() throws IOException {
            int size = readLength();
            if (size < 1) { return null; }
            Value value = new Value ((Persistit)null);
            value.setMaximumSize(size);
            value.ensureFit(size);
            int bytesRead = is.read(value.getEncodedBytes(), 0, size);
            assert bytesRead == size : "Invalid byte count on value read";
            value.setEncodedSize(size);
            return value;
        }

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                }
            }
            size = ((size  + SIZE_GRANULARITY - 1) / SIZE_GRANULARITY) * SIZE_GRANULARITY;
            
            // Create a new conversion value 
            Value convertValue =  new Value ((Persistit)null, 
                        Math.max(size, Value.INITIAL_SIZE), 
                        Math.max(size, Value.DEFAULT_MAXIMUM_SIZE));
            valueTarget.attach(convertValue);            
            // Covert the row to the Value for storage in the SortKey
            while(true) {
                try {
                    convertValue.clear();
                    convertValue.setStreamMode(true);
                    for (int i = 0; i < rowFields; i++) {
                        ValueSource field = row.value(i);
                        if (field.isNull()) {
                            valueTarget.putNull();
                        } else {
                            tFieldTypes[i].writeCanonical(field, valueTarget);
                        }
                    }
                    break;
                } catch (ConversionException e) {
                    enlargeValue(convertValue);
                }
            }
            // reset some more un-needed internal state. But this requires 
            // making a copy of the internal data, again. 
            return new Value(convertValue);
        }

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    public FDBIterationHelper(FDBAdapter adapter, IndexRowType rowType) {
        this.adapter = adapter;
        this.rowType = rowType.physicalRowType();
        this.storeData = adapter.getUnderlyingStore().createStoreData(adapter.getSession(), rowType.index());
        this.storeData.persistitValue = new Value((Persistit)null);
    }

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    }


    @Override
    void resetForWrite(FDBStoreData storeData, Index index, WriteIndexRow indexRowBuffer) {
        if(storeData.persistitValue == null) {
            storeData.persistitValue = new Value((Persistit) null);
        }
        indexRowBuffer.resetForWrite(index, storeData.persistitKey, storeData.persistitValue);
    }

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    }


    @Override
    public <V extends IndexVisitor<Key, Value>> V traverse(Session session, Index index, V visitor, long scanTimeLimit, long sleepTime) {
        FDBStoreData storeData = createStoreData(session, index);
        storeData.persistitValue = new Value((Persistit)null);
        TransactionState txn = txnService.getTransaction(session);
        long nextCommitTime = 0;
        if (scanTimeLimit >= 0) {
            nextCommitTime = txn.getStartTime() + scanTimeLimit;
        }

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