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This release adds support for Range Inventory Retrieval with Amazon Glacier and introduces a new AmazonS3URI class for working with Amazon S3 URIs.
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src/main/java/com/amazonaws/services/dynamodbv2/datamodeling/AttributeTransformerChain.java
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| /* | ||
| * Copyright 2013-2014 Amazon Technologies, Inc. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at: | ||
| * | ||
| * http://aws.amazon.com/apache2.0 | ||
| * | ||
| * This file is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES | ||
| * OR CONDITIONS OF ANY KIND, either express or implied. See the | ||
| * License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package com.amazonaws.services.dynamodbv2.datamodeling; | ||
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| import java.util.ArrayList; | ||
| import java.util.Arrays; | ||
| import java.util.Collections; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
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| import com.amazonaws.services.dynamodbv2.model.AttributeValue; | ||
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| /** | ||
| * A virtual {@code AttributeTransformer} that transforms and untransforms | ||
| * attributes by running them through a cascading series of child | ||
| * {@code AttributeTransformer} instances. | ||
| */ | ||
| public class AttributeTransformerChain implements AttributeTransformer { | ||
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| private final List<AttributeTransformer> transformers; | ||
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|
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| /** | ||
| * Creates a new transformer chain from the given array of transformers. | ||
| * When transforming attributes, these transformers are invoked from first | ||
| * to last; when untransforming they are invoked in the opposite order. | ||
| * | ||
| * @param transformers the chain of transformers. | ||
| */ | ||
| public AttributeTransformerChain( | ||
| final AttributeTransformer... transformers) { | ||
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| this(Arrays.asList(transformers)); | ||
| } | ||
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| /** | ||
| * Creates a new transformer chain from the given list of transformers. | ||
| * When transforming attributes, these transformers are invoked from first | ||
| * to last; when untransforming they are invoked in the opposite order. | ||
| * | ||
| * @param transformers the chain of transformers. | ||
| */ | ||
| public AttributeTransformerChain( | ||
| final List<AttributeTransformer> transformers) { | ||
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| this.transformers = Collections.unmodifiableList( | ||
| new ArrayList<AttributeTransformer>(transformers)); | ||
| } | ||
|
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| /** | ||
| * @return the transformers in this chain | ||
| */ | ||
| public List<AttributeTransformer> getTransformers() { | ||
| return transformers; | ||
| } | ||
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| @Override | ||
| public Map<String, AttributeValue> transform( | ||
| final Parameters<?> parameters) { | ||
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| ProxyParameters<?> proxy = new ProxyParameters(parameters); | ||
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| for (int i = 0; i < transformers.size(); ++i) { | ||
| proxy.setAttributeValues(transformers.get(i).transform(proxy)); | ||
| } | ||
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| return proxy.getAttributeValues(); | ||
| } | ||
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| @Override | ||
| public Map<String, AttributeValue> untransform( | ||
| final Parameters<?> parameters) { | ||
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| ProxyParameters<?> proxy = new ProxyParameters(parameters); | ||
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| for (int i = transformers.size() - 1; i >= 0; --i) { | ||
| proxy.setAttributeValues(transformers.get(i).untransform(proxy)); | ||
| } | ||
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| return proxy.getAttributeValues(); | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| return transformers.toString(); | ||
| } | ||
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| /** | ||
| * A {@code Parameters} proxy that intercepts calls to | ||
| * {@code getAttributeValues} and overrides the return value. | ||
| */ | ||
| private static class ProxyParameters<T> implements Parameters<T> { | ||
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| private final Parameters<T> delegate; | ||
| private Map<String, AttributeValue> values; | ||
|
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| /** | ||
| * Create a new proxy wrapping the given {@code Parameters} object. | ||
| * | ||
| * @param delegate the parameters object to wrap | ||
| */ | ||
| public ProxyParameters(final Parameters<T> delegate) { | ||
| this.delegate = delegate; | ||
| this.values = delegate.getAttributeValues(); | ||
| } | ||
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| @Override | ||
| public Map<String, AttributeValue> getAttributeValues() { | ||
| return values; | ||
| } | ||
|
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| /** | ||
| * Changes the attribute values for this instance. | ||
| * | ||
| * @param values the new values | ||
| */ | ||
| public void setAttributeValues( | ||
| final Map<String, AttributeValue> values) { | ||
| this.values = Collections.unmodifiableMap(values); | ||
| } | ||
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| @Override | ||
| public boolean isPartialUpdate() { | ||
| return delegate.isPartialUpdate(); | ||
| } | ||
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| @Override | ||
| public Class<T> getModelClass() { | ||
| return delegate.getModelClass(); | ||
| } | ||
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| @Override | ||
| public DynamoDBMapperConfig getMapperConfig() { | ||
| return delegate.getMapperConfig(); | ||
| } | ||
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| @Override | ||
| public String getTableName() { | ||
| return delegate.getTableName(); | ||
| } | ||
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| @Override | ||
| public String getHashKeyName() { | ||
| return delegate.getHashKeyName(); | ||
| } | ||
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| @Override | ||
| public String getRangeKeyName() { | ||
| return delegate.getRangeKeyName(); | ||
| } | ||
| } | ||
| } |
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