Examples of com.amazonaws.services.dynamodbv2.datamodeling.ArgumentMarshaller.StringAttributeMarshaller

Package com.amazonaws.services.dynamodbv2.datamodeling.ArgumentMarshaller

Examples of com.amazonaws.services.dynamodbv2.datamodeling.ArgumentMarshaller.StringAttributeMarshaller

com.amazonaws.services.dynamodbv2.model.AttributeValue
Object mapper for domain-object interaction with DynamoDB.
To use, annotate domain classes with the annotations found in the com.amazonaws.services.dynamodbv2.datamodeling package. A minimal example:
```
 @DynamoDBTable(tableName = "TestTable") public class TestClass { private Long key; private double rangeKey; private Long version; private Set<Integer> integerSetAttribute; @DynamoDBHashKey public Long getKey() { return key; } public void setKey(Long key) { this.key = key; } @DynamoDBRangeKey public double getRangeKey() { return rangeKey; } public void setRangeKey(double rangeKey) { this.rangeKey = rangeKey; } @DynamoDBAttribute(attributeName = "integerSetAttribute") public Set<Integer> getIntegerAttribute() { return integerSetAttribute; } public void setIntegerAttribute(Set<Integer> integerAttribute) { this.integerSetAttribute = integerAttribute; } @DynamoDBVersionAttribute public Long getVersion() { return version; } public void setVersion(Long version) { this.version = version; } } 
```
Save instances of annotated classes to DynamoDB, retrieve them, and delete them using the {@link DynamoDBMapper} class, as in the following example.
```
 DynamoDBMapper mapper = new DynamoDBMapper(dynamoDBClient); Long hashKey = 105L; double rangeKey = 1.0d; TestClass obj = mapper.load(TestClass.class, hashKey, rangeKey); obj.getIntegerAttribute().add(42); mapper.save(obj); mapper.delete(obj); 
```
When using the save, load, and delete methods, {@link DynamoDBMapper} willthrow {@link DynamoDBMappingException}s to indicate that domain classes are incorrectly annotated or otherwise incompatible with this class. Service exceptions will always be propagated as {@link AmazonClientException}, and DynamoDB-specific subclasses such as {@link ConditionalCheckFailedException}will be used when possible.
This class is thread-safe and can be shared between threads. It's also very lightweight, so it doesn't need to be. @see DynamoDBTable @see DynamoDBHashKey @see DynamoDBRangeKey @see DynamoDBAutoGeneratedKey @see DynamoDBAttribute @see DynamoDBVersionAttribute @see DynamoDBIgnore @see DynamoDBMarshalling @see DynamoDBMapperConfig

            if ( marshaller != null ) {
                return marshaller;
            }
            if ( isCustomMarshaller(getter) ) {
                // Custom marshaller always returns String attribute value.
                marshaller = new StringAttributeMarshaller() {
                    @Override public AttributeValue marshall(Object obj) {
                        return getCustomerMarshallerAttributeValue(getter, obj);
                    }
                };
            } else {

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        } else if ( Collection.class.isAssignableFrom(returnType) ) {
            throw new DynamoDBMappingException("Non-set collections aren't supported: "
                    + (getter.getDeclaringClass() + "." + getter.getName()));
        } else { // Non-set return type
            if ( Date.class.isAssignableFrom(returnType) ) {
                marshaller = new StringAttributeMarshaller() {


                    @Override
                    public AttributeValue marshall(Object obj) {
                        return new AttributeValue().withS(new DateUtils().formatIso8601Date((Date) obj));
                    }
                };
            } else if ( Calendar.class.isAssignableFrom(returnType) ) {
                marshaller = new StringAttributeMarshaller() {


                    @Override
                    public AttributeValue marshall(Object obj) {
                        return new AttributeValue().withS(new DateUtils()
                                .formatIso8601Date(((Calendar) obj).getTime()));
                    }
                };
            } else if ( boolean.class.isAssignableFrom(returnType)
                    || Boolean.class.isAssignableFrom(returnType) ) {
                marshaller = new NumberAttributeMarshaller() {


                    @Override
                    public AttributeValue marshall(Object obj) {
                        if ( obj == null || !(Boolean) obj ) {
                            return new AttributeValue().withN("0");
                        } else {
                            return new AttributeValue().withN("1");
                        }
                    }
                };
            } else if ( returnType.isPrimitive() || Number.class.isAssignableFrom(returnType) ) {
                marshaller = new NumberAttributeMarshaller() {


                    @Override
                    public AttributeValue marshall(Object obj) {
                        return new AttributeValue().withN(String.valueOf(obj));
                    }
                };
            } else if ( returnType == String.class ) {
                marshaller = new StringAttributeMarshaller() {


                    @Override
                    public AttributeValue marshall(Object obj) {
                        if ( ((String) obj).length() == 0 )
                            return null;

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     * @param returnType the return type
     * @return the default argument marshaller
     */
    private ArgumentMarshaller defaultArgumentMarshaller(final Class<?> returnType, final Method getter) {
        if ( returnType == S3Link.class ) {
            return new StringAttributeMarshaller() {
                @Override
                public AttributeValue marshall(Object obj) {
                    S3Link s3link = (S3Link) obj;
                    if ( s3link.getBucketName() == null || s3link.getKey() == null ) {
                        // insufficient S3 resource specification

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            if ( marshaller != null ) {
                return marshaller;
            }
            if ( isCustomMarshaller(getter) ) {
                // Custom marshaller always returns String attribute value.
                marshaller = new StringAttributeMarshaller() {
                    @Override public AttributeValue marshall(Object obj) {
                        return getCustomerMarshallerAttributeValue(getter, obj);
                    }
                };
            } else {

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        } else if ( Collection.class.isAssignableFrom(returnType) ) {
            throw new DynamoDBMappingException("Non-set collections aren't supported: "
                    + (getter.getDeclaringClass() + "." + getter.getName()));
        } else { // Non-set return type
            if ( Date.class.isAssignableFrom(returnType) ) {
                marshaller = new StringAttributeMarshaller() {


                    @Override
                    public AttributeValue marshall(Object obj) {
                        return new AttributeValue().withS(DateUtils.formatISO8601Date((Date) obj));
                    }
                };
            } else if ( Calendar.class.isAssignableFrom(returnType) ) {
                marshaller = new StringAttributeMarshaller() {


                    @Override
                    public AttributeValue marshall(Object obj) {
                        return new AttributeValue().withS(DateUtils
                                .formatISO8601Date(((Calendar) obj).getTime()));
                    }
                };
            } else if ( boolean.class.isAssignableFrom(returnType)
                    || Boolean.class.isAssignableFrom(returnType) ) {
                marshaller = new NumberAttributeMarshaller() {


                    @Override
                    public AttributeValue marshall(Object obj) {
                        if ( obj == null || !(Boolean) obj ) {
                            return new AttributeValue().withN("0");
                        } else {
                            return new AttributeValue().withN("1");
                        }
                    }
                };
            } else if ( returnType.isPrimitive() || Number.class.isAssignableFrom(returnType) ) {
                marshaller = new NumberAttributeMarshaller() {


                    @Override
                    public AttributeValue marshall(Object obj) {
                        return new AttributeValue().withN(String.valueOf(obj));
                    }
                };
            } else if ( returnType == String.class ) {
                marshaller = new StringAttributeMarshaller() {


                    @Override
                    public AttributeValue marshall(Object obj) {
                        if ( ((String) obj).length() == 0 )
                            return null;

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     * @param returnType the return type
     * @return the default argument marshaller
     */
    private ArgumentMarshaller defaultArgumentMarshaller(final Class<?> returnType, final Method getter) {
        if ( returnType == S3Link.class ) {
            return new StringAttributeMarshaller() {
                @Override
                public AttributeValue marshall(Object obj) {
                    S3Link s3link = (S3Link) obj;
                    if ( s3link.getBucketName() == null || s3link.getKey() == null ) {
                        // insufficient S3 resource specification

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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 ) {
                        onNonKeyAttribute(attributeName, currentValue);
                        nonKeyAttributePresent = true;
                    } else {
                        onNullNonKeyAttribute(attributeName);

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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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    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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