services-custom/dynamodb-enhanced/src/main/java/software/amazon/awssdk/enhanced/dynamodb/model/ConditionCheck.java [167:240]:
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    @NotThreadSafe
    public static final class Builder  {
        private Key key;
        private Expression conditionExpression;
        private String returnValuesOnConditionCheckFailure;

        private Builder() {
        }

        /**
         * Sets the primary {@link Key} that will be used together with the condition expression.
         *
         * @param key the primary key to use in the operation.
         * @return a builder of this type
         */
        public Builder key(Key key) {
            this.key = key;
            return this;
        }

        /**
         * Sets the primary {@link Key} that will be used together with the condition expression
         * on the builder by accepting a consumer of {@link Key.Builder}.
         *
         * @param keyConsumer a {@link Consumer} of {@link Key}
         * @return a builder of this type
         */
        public Builder key(Consumer<Key.Builder> keyConsumer) {
            Key.Builder builder = Key.builder();
            keyConsumer.accept(builder);
            return key(builder.build());
        }

        /**
         * Defines a logical expression on the attributes of table items that match the supplied primary key value(s).
         * If the expression evaluates to true, the transaction operation succeeds. If the expression evaluates to false,
         * the transaction will not succeed.
         * <p>
         * See {@link Expression} for condition syntax and examples.
         *
         * @param conditionExpression a condition written as an {@link Expression}
         * @return a builder of this type
         */
        public Builder conditionExpression(Expression conditionExpression) {
            this.conditionExpression = conditionExpression;
            return this;
        }

        /**
         * Use <code>ReturnValuesOnConditionCheckFailure</code> to get the item attributes if the <code>ConditionCheck</code>
         * condition fails. For <code>ReturnValuesOnConditionCheckFailure</code>, the valid values are: NONE and
         * ALL_OLD.
         *
         * @param returnValuesOnConditionCheckFailure What values to return on condition check failure.
         * @return a builder of this type
         */
        public Builder returnValuesOnConditionCheckFailure(
            ReturnValuesOnConditionCheckFailure returnValuesOnConditionCheckFailure) {
            this.returnValuesOnConditionCheckFailure = returnValuesOnConditionCheckFailure == null ? null :
                                                       returnValuesOnConditionCheckFailure.toString();
            return this;
        }

        /**
         * Use <code>ReturnValuesOnConditionCheckFailure</code> to get the item attributes if the <code>ConditionCheck</code>
         * condition fails. For <code>ReturnValuesOnConditionCheckFailure</code>, the valid values are: NONE and
         * ALL_OLD.
         *
         * @param returnValuesOnConditionCheckFailure What values to return on condition check failure.
         * @return a builder of this type
         */
        public Builder returnValuesOnConditionCheckFailure(String returnValuesOnConditionCheckFailure) {
            this.returnValuesOnConditionCheckFailure = returnValuesOnConditionCheckFailure;
            return this;
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services-custom/dynamodb-enhanced/src/main/java/software/amazon/awssdk/enhanced/dynamodb/model/TransactDeleteItemEnhancedRequest.java [143:215]:
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    @NotThreadSafe
    public static final class Builder {
        private Key key;
        private Expression conditionExpression;
        private String returnValuesOnConditionCheckFailure;

        private Builder() {
        }

        /**
         * Sets the primary {@link Key} that will be used to match the item to delete.
         *
         * @param key the primary key to use in the request.
         * @return a builder of this type
         */
        public Builder key(Key key) {
            this.key = key;
            return this;
        }

        /**
         * Sets the primary {@link Key} that will be used to match the item to delete
         * on the builder by accepting a consumer of {@link Key.Builder}.
         *
         * @param keyConsumer a {@link Consumer} of {@link Key}
         * @return a builder of this type
         */
        public Builder key(Consumer<Key.Builder> keyConsumer) {
            Key.Builder builder = Key.builder();
            keyConsumer.accept(builder);
            return key(builder.build());
        }

        /**
         * Defines a logical expression on an item's attribute values which, if evaluating to true,
         * will allow the delete operation to succeed. If evaluating to false, the operation will not succeed.
         * <p>
         * See {@link Expression} for condition syntax and examples.
         *
         * @param conditionExpression a condition written as an {@link Expression}
         * @return a builder of this type
         */
        public Builder conditionExpression(Expression conditionExpression) {
            this.conditionExpression = conditionExpression;
            return this;
        }

        /**
         * Use <code>ReturnValuesOnConditionCheckFailure</code> to get the item attributes if the <code>Delete</code>
         * condition fails. For <code>ReturnValuesOnConditionCheckFailure</code>, the valid values are: NONE and
         * ALL_OLD.
         *
         * @param returnValuesOnConditionCheckFailure What values to return on condition check failure.
         * @return a builder of this type
         */
        public Builder returnValuesOnConditionCheckFailure(
            ReturnValuesOnConditionCheckFailure returnValuesOnConditionCheckFailure) {
            this.returnValuesOnConditionCheckFailure = returnValuesOnConditionCheckFailure == null ? null :
                                                       returnValuesOnConditionCheckFailure.toString();
            return this;
        }

        /**
         * Use <code>ReturnValuesOnConditionCheckFailure</code> to get the item attributes if the <code>Delete</code>
         * condition fails. For <code>ReturnValuesOnConditionCheckFailure</code>, the valid values are: NONE and
         * ALL_OLD.
         *
         * @param returnValuesOnConditionCheckFailure What values to return on condition check failure.
         * @return a builder of this type
         */
        public Builder returnValuesOnConditionCheckFailure(String returnValuesOnConditionCheckFailure) {
            this.returnValuesOnConditionCheckFailure = returnValuesOnConditionCheckFailure;
            return this;
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