Example usage for com.amazonaws.services.dynamodbv2.xspec ExpressionSpecBuilder withCondition

Introduction

In this page you can find the example usage for com.amazonaws.services.dynamodbv2.xspec ExpressionSpecBuilder withCondition.

Prototype

public ExpressionSpecBuilder withCondition(Condition condition) 

Source Link

Document

Fluent API to set the condition expression for a request.

Usage

From source file:com.github.fge.jsonpatch.RemoveOperation.java

License:LGPL

@Override
public void applyToBuilder(ExpressionSpecBuilder builder) {
    String attributePath = pathGenerator.apply(path);
    builder.addUpdate(ExpressionSpecBuilder.remove(attributePath));
    //because it is an error to remove a path that does not exist
    //add an attribute_exists() condition
    builder.withCondition(ExpressionSpecBuilder.attribute_exists(pathGenerator.apply(path)));
}

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From source file:com.github.fge.jsonpatch.ReplaceOperation.java

License:LGPL

@Override
public void applyToBuilder(ExpressionSpecBuilder builder) {
    //add the set operation
    super.applyToBuilder(builder);
    //because it is an error to replace a path that does not exist
    //add an attribute_exists() condition
    builder.withCondition(ExpressionSpecBuilder.attribute_exists(pathGenerator.apply(path)));
}

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From source file:jp.classmethod.aws.dynamodb.DynamoDbRepository.java

License:Open Source License

@Override
public E update(K key, JsonPatch patch, boolean increment, long version) {
    final PrimaryKey pk = createKeys(key);
    Preconditions.checkNotNull(patch, "patch must not be null");
    Preconditions.checkArgument(version >= -1);

    ExpressionSpecBuilder builder = patch.get();

    //add a condition on item existence
    builder.withCondition(ExpressionSpecBuilder.attribute_exists(hashKeyName));
    //add update expression for incrementing the version
    if (increment && versionProperty != null) {
        builder.addUpdate(ExpressionSpecBuilder.N(versionProperty)
                .set(ExpressionSpecBuilder.N(versionProperty).plus(1L)));
    }/*  w  w w.j a  v a 2  s .  c om*/
    //add version condition
    if (version >= 0) {
        Preconditions.checkState(versionProperty != null);
        builder.withCondition(ExpressionSpecBuilder.N(versionProperty).eq(version));
    }

    UpdateItemExpressionSpec spec = builder.buildForUpdate();
    Preconditions.checkArgument(false == Strings.isNullOrEmpty(spec.getUpdateExpression()),
            "patch may not be empty"); // TODO add mechanism to JSON patch to allow iterating over list of ops
    try {
        UpdateItemOutcome updateItemOutcome = table.updateItem(new UpdateItemSpec().withExpressionSpec(spec)
                .withPrimaryKey(pk).withReturnValues(ReturnValue.ALL_NEW));
        return convertItemToDomain(updateItemOutcome.getItem());
    } catch (AmazonClientException e) {
        throw processUpdateItemException(key, e);
    }
}

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From source file:jp.classmethod.aws.dynamodb.DynamoDbRepository.java

License:Open Source License

@Override
public <S extends E> S update(S domain, VersionCondition condition) {
    Preconditions.checkNotNull(domain, "domain must not be null");
    final Item domainItem = convertDomainToItem(domain);
    Preconditions.checkArgument(domainItem.hasAttribute(hashKeyName),
            "hash key must be set in domain object when updating: " + hashKeyName);

    ExpressionSpecBuilder builder = new ExpressionSpecBuilder();
    builder.withCondition(ExpressionSpecBuilder.S(hashKeyName).exists());
    if (condition != null) {
        Preconditions.checkState(versionProperty != null);
        builder.withCondition(ExpressionSpecBuilder.N(versionProperty).eq(condition.getVersion()));
    }/*from  ww w .  jav a2  s . com*/
    PutItemExpressionSpec xSpec = builder.buildForPut();
    PutItemSpec spec = new PutItemSpec().withItem(domainItem).withExpressionSpec(xSpec);
    try {
        table.putItem(spec);
    } catch (AmazonClientException e) {
        throw processUpdateItemException(getId(domain), e);
    }
    // PutItem does not accept ReturnValue.ALL_NEW
    return domain;
}

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