Package com.amazonaws.services.dynamodbv2

Examples of com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient


    private <T> Map<String, AttributeValue> getKey(T keyObject, Class<T> clazz) {
        Map<String, AttributeValue> key = new HashMap<String, AttributeValue>();
        for (Method keyGetter : reflector.getKeyGetters(clazz)) {
            Object getterResult = safeInvoke(keyGetter, keyObject);
            AttributeValue keyAttributeValue = getSimpleAttributeValue(keyGetter, getterResult);
            if (keyAttributeValue == null) {
                throw new DynamoDBMappingException("Null key found for " + keyGetter);
            }
            key.put(reflector.getAttributeName(keyGetter), keyAttributeValue);
        }
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                if ( reflector.isVersionAttributeGetter(method) ) {
                    Object getterResult = safeInvoke(method, object);
                    String attributeName = reflector.getAttributeName(method);

                    ExpectedAttributeValue expected = new ExpectedAttributeValue();
                    AttributeValue currentValue = getSimpleAttributeValue(method, getterResult);
                    expected.setExists(currentValue != null);
                    if ( currentValue != null )
                        expected.setValue(currentValue);
                    expectedValues.put(attributeName, expected);
                    break;
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            // Look at every getter and construct a value object for it
            for ( Method method : reflector.getRelevantGetters(clazz) ) {
                Object getterResult = safeInvoke(method, toWrite);
                String attributeName = reflector.getAttributeName(method);

                AttributeValue currentValue = null;
                if ( getterResult == null && reflector.isAssignableKey(method) ) {
                    currentValue = getAutoGeneratedKeyAttributeValue(method, getterResult);
                    inMemoryUpdates.add(new ValueUpdate(method, currentValue, toWrite));
                } else {
                    currentValue = getSimpleAttributeValue(method, getterResult);
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                if ( getterResult == null && reflector.isAssignableKey(method) ) {
                    onAutoGenerateAssignableKey(method, attributeName);
                }
               
                else {
                    AttributeValue newAttributeValue = getSimpleAttributeValue(method, getterResult);
                    if ( newAttributeValue == null ) {
                        throw new DynamoDBMappingException("Null or empty value for key: " + method);
                    }

                    onKeyAttributeValue(attributeName, newAttributeValue);
                }
            }

            /*
             * Next construct an update for every non-key property
             */
            for ( Method method : reflector.getRelevantGetters(clazz) ) {

                // Skip any key methods, since they are handled separately
                if ( keyGetters.contains(method) )
                    continue;

                Object getterResult = safeInvoke(method, object);
                String attributeName = reflector.getAttributeName(method);

                /*
                 * If this is a versioned field, update it
                 */
                if ( reflector.isVersionAttributeGetter(method) ) {
                    onVersionAttribute(method, getterResult, attributeName);
                    nonKeyAttributePresent = true;
                }

                /*
                 * Otherwise apply the update value for this attribute.
                 */
                else  {
                    AttributeValue currentValue = getSimpleAttributeValue(method, getterResult);
                    if ( currentValue != null ) {
                        updateValues.put(attributeName, new AttributeValueUpdate().withValue(currentValue)
                                .withAction("PUT"));
                        nonKeyAttributePresent = true;
                    } else {
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        protected List<ValueUpdate> getInMemoryUpdates() {
            return inMemoryUpdates;
        }
       
        private void onAutoGenerateAssignableKey(Method method, String attributeName) {
            AttributeValue newVersionValue = getAutoGeneratedKeyAttributeValue(method, null);
           
            updateValues.put(attributeName,
                    new AttributeValueUpdate().withAction("PUT").withValue(newVersionValue));
            inMemoryUpdates.add(new ValueUpdate(method, newVersionValue, object));
           
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                // update call
                ExpectedAttributeValue expected = new ExpectedAttributeValue();

                // For new objects, insist that the value doesn't exist.
                // For existing ones, insist it has the old value.
                AttributeValue currentValue = getSimpleAttributeValue(method, getterResult);
                expected.setExists(currentValue != null);
                if ( currentValue != null ) {
                    expected.setValue(currentValue);
                }
                expectedValues.put(attributeName, expected);
            }

            AttributeValue newVersionValue = getVersionAttributeValue(method, getterResult);
            updateValues
                    .put(attributeName, new AttributeValueUpdate().withAction("PUT").withValue(newVersionValue));
            inMemoryUpdates.add(new ValueUpdate(method, newVersionValue, object));
        }
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         *            The name of the non-key attribute.
         * @param currentValue
         *            The updated value of the given attribute.
         */
        protected void onNonKeyAttribute(String attributeName, AttributeValue currentValue) {
            updateValues.put(attributeName, new AttributeValueUpdate()
                    .withValue(currentValue).withAction("PUT"));
        }
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        private void onAutoGenerateAssignableKey(Method method, String attributeName) {
            AttributeValue newVersionValue = getAutoGeneratedKeyAttributeValue(method, null);
           
            updateValues.put(attributeName,
                    new AttributeValueUpdate().withAction("PUT").withValue(newVersionValue));
            inMemoryUpdates.add(new ValueUpdate(method, newVersionValue, object));
           
            if ( getLocalSaveBehavior() != SaveBehavior.CLOBBER ) {
                // Add an expect clause to make sure that the item
                // doesn't already exist, since it's supposed to be new
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                expectedValues.put(attributeName, expected);
            }

            AttributeValue newVersionValue = getVersionAttributeValue(method, getterResult);
            updateValues
                    .put(attributeName, new AttributeValueUpdate().withAction("PUT").withValue(newVersionValue));
            inMemoryUpdates.add(new ValueUpdate(method, newVersionValue, object));
        }
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                @Override
                protected void onKeyAttributeValue(String attributeName,
                        AttributeValue keyAttributeValue) {
                    /* Treat key values as common attribute value updates. */
                    getAttributeValueUpdates().put(attributeName,
                            new AttributeValueUpdate().withValue(keyAttributeValue)
                                    .withAction("PUT"));
                }

                /* Use default implementation of onNonKeyAttribute(...) */
               
                @Override
                protected void onNullNonKeyAttribute(String attributeName) {
                    /* When doing a force put, we can safely ignore the null-valued attributes. */
                    return;
                }

                @Override
                protected void executeLowLevelRequest(boolean onlyKeyAttributeSpecified) {
                    /* Send a putItem request */
                    db.putItem(applyUserAgent(new PutItemRequest().withTableName(getTableName())
                            .withItem(transformAttributes(this.clazz, convertToItem(getAttributeValueUpdates())))
                            .withExpected(getExpectedAttributeValues())));
                }
            };
        } else {
            saveObjectHandler = this.new SaveObjectHandler(clazz, object,
                    tableName, config.getSaveBehavior()) {

                @Override
                protected void onKeyAttributeValue(String attributeName,
                        AttributeValue keyAttributeValue) {
                    /* Put it in the key collection which is later used in the updateItem request. */
                    getKeyAttributeValues().put(attributeName, keyAttributeValue);
                }
               

                @Override
                protected void onNonKeyAttribute(String attributeName,
                        AttributeValue currentValue) {
                    /* If it's a set attribute and the mapper is configured with APPEND_SET,
                     * we do an "ADD" update instead of the default "PUT".
                     */
                    if (getLocalSaveBehavior() == SaveBehavior.APPEND_SET) {
                        if (currentValue.getBS() != null
                                || currentValue.getNS() != null
                                || currentValue.getSS() != null) {
                            getAttributeValueUpdates().put(
                                    attributeName,
                                    new AttributeValueUpdate().withValue(
                                            currentValue).withAction("ADD"));
                            return;
                        }
                    }
                    /* Otherwise, we do the default "PUT" update. */
                    super.onNonKeyAttribute(attributeName, currentValue);
                }

                @Override
                protected void onNullNonKeyAttribute(String attributeName) {
                    /*
                     * If UPDATE_SKIP_NULL_ATTRIBUTES or APPEND_SET is
                     * configured, we don't delete null value attributes.
                     */
                    if (getLocalSaveBehavior() == SaveBehavior.UPDATE_SKIP_NULL_ATTRIBUTES
                            || getLocalSaveBehavior() == SaveBehavior.APPEND_SET) {
                        return;
                    }
                   
                    else {
                        /* Delete attributes that are set as null in the object. */
                        getAttributeValueUpdates()
                                .put(attributeName,
                                        new AttributeValueUpdate()
                                                .withAction("DELETE"));
                    }
                }

                @Override
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