Package com.amazonaws.services.dynamodbv2.model

Examples of com.amazonaws.services.dynamodbv2.model.ExpectedAttributeValue

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        private void onVersionAttribute(Method method, Object getterResult,
                String attributeName) {
            if ( getLocalSaveBehavior() != SaveBehavior.CLOBBER ) {
                // First establish the expected (current) value for the
                // 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);
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        Map<String, ExpectedAttributeValue> expectedValues = new HashMap<String, ExpectedAttributeValue>();

        String hashKeyAttributeName = reflector.getAttributeName(hashKeyGetter);
        Object hashGetterResult = safeInvoke(hashKeyGetter, object);
        attributes.put(hashKeyAttributeName, getSimpleAttributeValue(hashKeyGetter, hashGetterResult));
        expectedValues.put(hashKeyAttributeName, new ExpectedAttributeValue().withExists(false));

        if (rangeKeyGetter != null) {
            String rangeKeyAttributeName = reflector.getAttributeName(rangeKeyGetter);
            Object rangeGetterResult = safeInvoke(rangeKeyGetter, object);
            attributes.put(rangeKeyAttributeName, getSimpleAttributeValue(rangeKeyGetter, rangeGetterResult));
            expectedValues.put(rangeKeyAttributeName, new ExpectedAttributeValue().withExists(false));
        }
        attributes = transformAttributes(clazz, attributes);
        db.putItem(applyUserAgent(new PutItemRequest().withTableName(tableName).withItem(attributes)
                .withExpected(expectedValues)));
    }
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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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import com.fasterxml.jackson.core.JsonToken;

public class ExpectedAttributeValueJsonUnmarshaller implements Unmarshaller<ExpectedAttributeValue, JsonUnmarshallerContext> {

    public ExpectedAttributeValue unmarshall(JsonUnmarshallerContext context) throws Exception {
        ExpectedAttributeValue request = new ExpectedAttributeValue();

        int originalDepth = context.getCurrentDepth();
        int targetDepth = originalDepth + 1;

        JsonToken token = context.currentToken;
        if (token == null) token = context.nextToken();

       while (true) {
            if (token == null) break;
            if (token == JsonToken.FIELD_NAME || token == JsonToken.START_OBJECT) {
                if (context.testExpression("Value", targetDepth)) {
                    request.setValue(AttributeValueJsonUnmarshaller.getInstance().unmarshall(context));
                }
                if (context.testExpression("Exists", targetDepth)) {
                    context.nextToken();
                    request.setExists(SimpleTypeJsonUnmarshallers.BooleanJsonUnmarshaller.getInstance().unmarshall(context));
                }
            } else if (token == JsonToken.END_ARRAY || token == JsonToken.END_OBJECT) {
                if (context.getCurrentDepth() <= originalDepth) break;
            }
            token = context.nextToken();
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  public void putItemWithExpected() {
        createGenericTable(tableName);

    AttributeValue value = new AttributeValue("test1");
    Map<String, ExpectedAttributeValue> expectedMap = new HashMap<String, ExpectedAttributeValue>();
    expectedMap.put("id", new ExpectedAttributeValue(false));

    Map<String, AttributeValue> item = createGenericItem(value, null);

    AmazonDynamoDB client = getClient();
    client.putItem(new PutItemRequest(tableName, item).withExpected(expectedMap));
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        //conditional update
        HashMap<String, AttributeValueUpdate> newValues = new HashMap<String, AttributeValueUpdate> ();
        newValues.put("count", new AttributeValueUpdate(new AttributeValue().withN("102"), AttributeAction.PUT));

        HashMap<String, ExpectedAttributeValue> expectedValues = new HashMap<String, ExpectedAttributeValue> ();
        expectedValues.put("count", new ExpectedAttributeValue().withValue(new AttributeValue().withN("100")));

        update = new UpdateItemRequest().withTableName(tableName).withKey(createItemKey("id", hashKey)).withAttributeUpdates(newValues).withExpected(expectedValues);
        getClient().updateItem(update);

        inProcessClient.save(PERSISTENCE_PATH);
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        HashMap<String, AttributeValueUpdate> newValues = new HashMap<String, AttributeValueUpdate> ();
        newValues.put("count", new AttributeValueUpdate(new AttributeValue().withN("102"), AttributeAction.PUT));
        newValues.put("ids", new AttributeValueUpdate(new AttributeValue().withS("[er, er]"), AttributeAction.ADD));

        HashMap<String, ExpectedAttributeValue> expectedValues = new HashMap<String, ExpectedAttributeValue> ();
        expectedValues.put("count", new ExpectedAttributeValue().withValue(new AttributeValue().withN("100")));

        update = new UpdateItemRequest().withTableName(tableName).withKey(createItemKey("id", hashKey)).withAttributeUpdates(newValues).withExpected(expectedValues);
        getClient().updateItem(update);

        inProcessClient.save(PERSISTENCE_PATH);
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        HashMap<String, AttributeValueUpdate> newValues = new HashMap<String, AttributeValueUpdate> ();
        newValues.put("count", new AttributeValueUpdate(new AttributeValue().withN("102"), AttributeAction.PUT));
        newValues.put("ids", new AttributeValueUpdate(new AttributeValue().withS("[er, er]"), AttributeAction.PUT));

        HashMap<String, ExpectedAttributeValue> expectedValues = new HashMap<String, ExpectedAttributeValue> ();
        expectedValues.put("count", new ExpectedAttributeValue().withValue(new AttributeValue().withN("100")));

        update = new UpdateItemRequest().withTableName(tableName).withKey(createItemKey("id", hashKey)).withAttributeUpdates(newValues).withExpected(expectedValues);
        getClient().updateItem(update);

        inProcessClient.save(PERSISTENCE_PATH);
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        //conditional update
        HashMap<String, AttributeValueUpdate> newValues = new HashMap<String, AttributeValueUpdate> ();
        newValues.put("count", new AttributeValueUpdate(new AttributeValue().withN("102"), AttributeAction.PUT));

        HashMap<String, ExpectedAttributeValue> expectedValues = new HashMap<String, ExpectedAttributeValue> ();
        expectedValues.put("count", new ExpectedAttributeValue().withValue(new AttributeValue().withN("10")));

        update = new UpdateItemRequest().withTableName(tableName).withKey(createItemKey("id", hashKey)).withAttributeUpdates(newValues).withExpected(expectedValues);

        try{
          getClient().updateItem(update);
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        HashMap<String, AttributeValueUpdate> newValues = new HashMap<String, AttributeValueUpdate> ();
        newValues.put("count", new AttributeValueUpdate(new AttributeValue().withN("102"), AttributeAction.PUT));
        newValues.put("ids", new AttributeValueUpdate(new AttributeValue().withS("[er, er]"), AttributeAction.DELETE));

        HashMap<String, ExpectedAttributeValue> expectedValues = new HashMap<String, ExpectedAttributeValue> ();
        expectedValues.put("count", new ExpectedAttributeValue().withValue(new AttributeValue().withN("100")));

        update = new UpdateItemRequest().withTableName(tableName).withKey(createItemKey("id", hashKey)).withAttributeUpdates(newValues).withExpected(expectedValues);
        getClient().updateItem(update);

        inProcessClient.save(PERSISTENCE_PATH);
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Related Classes of com.amazonaws.services.dynamodbv2.model.ExpectedAttributeValue

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  • com.amazonaws.internal.StaticCredentialsProvider
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  • com.amazonaws.services.dynamodbv2.datamodeling.ArgumentMarshaller.StringAttributeMarshaller
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  • com.amazonaws.services.dynamodbv2.datamodeling.ConversionSchemas$StandardItemConverter
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