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Calcite APIs for LINQ (Language-Integrated Query) in Java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to you 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://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License 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 org.apache.calcite.linq4j;
import org.apache.calcite.linq4j.function.BigDecimalFunction1;
import org.apache.calcite.linq4j.function.DoubleFunction1;
import org.apache.calcite.linq4j.function.EqualityComparer;
import org.apache.calcite.linq4j.function.FloatFunction1;
import org.apache.calcite.linq4j.function.Function1;
import org.apache.calcite.linq4j.function.Function2;
import org.apache.calcite.linq4j.function.IntegerFunction1;
import org.apache.calcite.linq4j.function.LongFunction1;
import org.apache.calcite.linq4j.function.NullableBigDecimalFunction1;
import org.apache.calcite.linq4j.function.NullableDoubleFunction1;
import org.apache.calcite.linq4j.function.NullableFloatFunction1;
import org.apache.calcite.linq4j.function.NullableIntegerFunction1;
import org.apache.calcite.linq4j.function.NullableLongFunction1;
import org.apache.calcite.linq4j.function.Predicate1;
import org.apache.calcite.linq4j.function.Predicate2;
import org.apache.calcite.linq4j.tree.FunctionExpression;
import java.math.BigDecimal;
import java.util.Comparator;
/**
* Factory for building {@link Queryable} objects.
*
* @param Element type
*/
public interface QueryableFactory {
/**
* Applies an accumulator function over a sequence.
*/
T aggregate(Queryable source,
FunctionExpression> selector);
/**
* Applies an accumulator function over a
* sequence. The specified seed value is used as the initial
* accumulator value.
*/
TAccumulate aggregate(Queryable source, TAccumulate seed,
FunctionExpression> selector);
/**
* Applies an accumulator function over a
* sequence. The specified seed value is used as the initial
* accumulator value, and the specified function is used to select
* the result value.
*/
TResult aggregate(Queryable source,
TAccumulate seed,
FunctionExpression> func,
FunctionExpression> selector);
/**
* Determines whether all the elements of a sequence
* satisfy a condition.
*/
boolean all(Queryable source, FunctionExpression> predicate);
/**
* Determines whether a sequence contains any
* elements.
*/
boolean any(Queryable source);
/**
* Determines whether any element of a sequence
* satisfies a condition.
*/
boolean any(Queryable source, FunctionExpression> predicate);
/**
* Computes the average of a sequence of Decimal
* values that is obtained by invoking a projection function on
* each element of the input sequence.
*/
BigDecimal averageBigDecimal(Queryable source,
FunctionExpression> selector);
/**
* Computes the average of a sequence of nullable
* Decimal values that is obtained by invoking a projection
* function on each element of the input sequence.
*/
BigDecimal averageNullableBigDecimal(Queryable source,
FunctionExpression> selector);
/**
* Computes the average of a sequence of Double
* values that is obtained by invoking a projection function on
* each element of the input sequence.
*/
double averageDouble(Queryable source,
FunctionExpression> selector);
/**
* Computes the average of a sequence of nullable
* Double values that is obtained by invoking a projection
* function on each element of the input sequence.
*/
Double averageNullableDouble(Queryable source,
FunctionExpression> selector);
/**
* Computes the average of a sequence of int values
* that is obtained by invoking a projection function on each
* element of the input sequence.
*/
int averageInteger(Queryable source,
FunctionExpression> selector);
/**
* Computes the average of a sequence of nullable
* int values that is obtained by invoking a projection function
* on each element of the input sequence.
*/
Integer averageNullableInteger(Queryable source,
FunctionExpression> selector);
/**
* Computes the average of a sequence of Float
* values that is obtained by invoking a projection function on
* each element of the input sequence.
*/
float averageFloat(Queryable source,
FunctionExpression> selector);
/**
* Computes the average of a sequence of nullable
* Float values that is obtained by invoking a projection
* function on each element of the input sequence.
*/
Float averageNullableFloat(Queryable source,
FunctionExpression> selector);
/**
* Computes the average of a sequence of long values
* that is obtained by invoking a projection function on each
* element of the input sequence.
*/
long averageLong(Queryable source,
FunctionExpression> selector);
/**
* Computes the average of a sequence of nullable
* long values that is obtained by invoking a projection function
* on each element of the input sequence.
*/
Long averageNullableLong(Queryable source,
FunctionExpression> selector);
/**
* Concatenates two sequences.
*/
Queryable concat(Queryable source, Enumerable source2);
/**
* Determines whether a sequence contains a specified
* element by using the default equality comparer.
*/
boolean contains(Queryable source, T element);
/**
* Determines whether a sequence contains a specified
* element by using a specified {@code EqualityComparer}.
*/
boolean contains(Queryable source, T element,
EqualityComparer comparer);
/**
* Returns the number of elements in a
* sequence.
*/
int count(Queryable source);
/**
* Returns the number of elements in the specified
* sequence that satisfies a condition.
*/
int count(Queryable source, FunctionExpression> predicate);
/**
* Returns the elements of the specified sequence or
* the type parameter's default value in a singleton collection if
* the sequence is empty.
*/
Queryable defaultIfEmpty(Queryable source);
/**
* Returns the elements of the specified sequence or
* the specified value in a singleton collection if the sequence
* is empty.
*/
Queryable defaultIfEmpty(Queryable source, T value);
/**
* Returns distinct elements from a sequence by using
* the default equality comparer to compare values.
*/
Queryable distinct(Queryable source);
/**
* Returns distinct elements from a sequence by using
* a specified {@code EqualityComparer} to compare values.
*/
Queryable distinct(Queryable source, EqualityComparer comparer);
/**
* Returns the element at a specified index in a
* sequence.
*/
T elementAt(Queryable source, int index);
/**
* Returns the element at a specified index in a
* sequence or a default value if the index is out of
* range.
*/
T elementAtOrDefault(Queryable source, int index);
/**
* Produces the set difference of two sequences by
* using the default equality comparer to compare values. (Defined
* by Queryable.)
*/
Queryable except(Queryable source, Enumerable enumerable);
/**
* Produces the set difference of two sequences by
* using the specified {@code EqualityComparer} to compare
* values.
*/
Queryable except(Queryable source, Enumerable enumerable,
EqualityComparer comparer);
/**
* Returns the first element of a sequence. (Defined
* by Queryable.)
*/
T first(Queryable source);
/**
* Returns the first element of a sequence that
* satisfies a specified condition.
*/
T first(Queryable source, FunctionExpression> predicate);
/**
* Returns the first element of a sequence, or a
* default value if the sequence contains no elements.
*/
T firstOrDefault(Queryable source);
/**
* Returns the first element of a sequence that
* satisfies a specified condition or a default value if no such
* element is found.
*/
T firstOrDefault(Queryable source,
FunctionExpression> predicate);
/**
* Groups the elements of a sequence according to a
* specified key selector function.
*/
Queryable> groupBy(Queryable source,
FunctionExpression> keySelector);
/**
* Groups the elements of a sequence according to a
* specified key selector function and compares the keys by using
* a specified comparer.
*/
Queryable> groupBy(Queryable source,
FunctionExpression> keySelector,
EqualityComparer comparer);
/**
* Groups the elements of a sequence according to a
* specified key selector function and projects the elements for
* each group by using a specified function.
*/
Queryable> groupBy(
Queryable source, FunctionExpression> keySelector,
FunctionExpression> elementSelector);
/**
* Groups the elements of a sequence and projects the
* elements for each group by using a specified function. Key
* values are compared by using a specified comparer.
*/
Queryable> groupBy(
Queryable source, FunctionExpression> keySelector,
FunctionExpression> elementSelector,
EqualityComparer comparer);
/**
* Groups the elements of a sequence according to a
* specified key selector function and creates a result value from
* each group and its key.
*/
Queryable groupByK(
Queryable source, FunctionExpression> keySelector,
FunctionExpression, TResult>> resultSelector);
/**
* Groups the elements of a sequence according to a
* specified key selector function and creates a result value from
* each group and its key. Keys are compared by using a specified
* comparer.
*/
Queryable groupByK(Queryable source,
FunctionExpression> keySelector,
FunctionExpression, TResult>> resultSelector,
EqualityComparer comparer);
/**
* Groups the elements of a sequence according to a
* specified key selector function and creates a result value from
* each group and its key. The elements of each group are
* projected by using a specified function.
*/
Queryable groupBy(Queryable source,
FunctionExpression> keySelector,
FunctionExpression> elementSelector,
FunctionExpression, TResult>> resultSelector);
/**
* Groups the elements of a sequence according to a
* specified key selector function and creates a result value from
* each group and its key. Keys are compared by using a specified
* comparer and the elements of each group are projected by using
* a specified function.
*/
Queryable groupBy(Queryable source,
FunctionExpression> keySelector,
FunctionExpression> elementSelector,
FunctionExpression, TResult>> resultSelector,
EqualityComparer comparer);
/**
* Correlates the elements of two sequences based on
* key equality and groups the results. The default equality
* comparer is used to compare keys.
*/
Queryable groupJoin(Queryable source,
Enumerable inner,
FunctionExpression> outerKeySelector,
FunctionExpression> innerKeySelector,
FunctionExpression, TResult>> resultSelector);
/**
* Correlates the elements of two sequences based on
* key equality and groups the results. A specified
* EqualityComparer is used to compare keys.
*/
Queryable groupJoin(Queryable source,
Enumerable inner,
FunctionExpression> outerKeySelector,
FunctionExpression> innerKeySelector,
FunctionExpression, TResult>> resultSelector,
EqualityComparer comparer);
/**
* Produces the set intersection of two sequences by
* using the default equality comparer to compare values. (Defined
* by Queryable.)
*/
Queryable intersect(Queryable source, Enumerable enumerable);
/**
* Produces the set intersection of two sequences by
* using the specified EqualityComparer to compare
* values.
*/
Queryable intersect(Queryable source, Enumerable enumerable,
EqualityComparer comparer);
/**
* Correlates the elements of two sequences based on
* matching keys. The default equality comparer is used to compare
* keys.
*/
Queryable join(Queryable source,
Enumerable inner,
FunctionExpression> outerKeySelector,
FunctionExpression> innerKeySelector,
FunctionExpression> resultSelector);
/**
* Correlates the elements of two sequences based on
* matching keys. A specified EqualityComparer is used to
* compare keys.
*/
Queryable join(Queryable source,
Enumerable inner,
FunctionExpression> outerKeySelector,
FunctionExpression> innerKeySelector,
FunctionExpression> resultSelector,
EqualityComparer comparer);
/**
* Returns the last element in a sequence. (Defined
* by Queryable.)
*/
T last(Queryable source);
/**
* Returns the last element of a sequence that
* satisfies a specified condition.
*/
T last(Queryable source, FunctionExpression> predicate);
/**
* Returns the last element in a sequence, or a
* default value if the sequence contains no elements.
*/
T lastOrDefault(Queryable source);
/**
* Returns the last element of a sequence that
* satisfies a condition or a default value if no such element is
* found.
*/
T lastOrDefault(Queryable source,
FunctionExpression> predicate);
/**
* Returns an long that represents the total number
* of elements in a sequence.
*/
long longCount(Queryable source);
/**
* Returns an long that represents the number of
* elements in a sequence that satisfy a condition.
*/
long longCount(Queryable source,
FunctionExpression> predicate);
/**
* Returns the maximum value in a generic
* {@code IQueryable}.
*/
T max(Queryable source);
/**
* Invokes a projection function on each element of a
* generic {@code IQueryable} and returns the maximum resulting
* value.
*/
> TResult max(Queryable source,
FunctionExpression> selector);
/**
* Returns the minimum value in a generic
* {@code IQueryable}.
*/
T min(Queryable source);
/**
* Invokes a projection function on each element of a
* generic {@code IQueryable} and returns the minimum resulting
* value.
*/
> TResult min(Queryable source,
FunctionExpression> selector);
/**
* Filters the elements of an IQueryable based on a
* specified type.
*/
Queryable ofType(Queryable source,
Class clazz);
Queryable cast(Queryable source, Class clazz);
/**
* Sorts the elements of a sequence in ascending
* order according to a key.
*/
OrderedQueryable orderBy(Queryable source,
FunctionExpression> keySelector);
/**
* Sorts the elements of a sequence in ascending
* order by using a specified comparer.
*/
OrderedQueryable orderBy(Queryable source,
FunctionExpression> keySelector,
Comparator comparator);
/**
* Sorts the elements of a sequence in descending
* order according to a key.
*/
OrderedQueryable orderByDescending(
Queryable source, FunctionExpression> keySelector);
/**
* Sorts the elements of a sequence in descending
* order by using a specified comparer.
*/
OrderedQueryable orderByDescending(Queryable source,
FunctionExpression> keySelector,
Comparator comparator);
/**
* Inverts the order of the elements in a sequence.
*/
Queryable reverse(Queryable source);
/**
* Projects each element of a sequence into a new form.
*/
Queryable select(Queryable source,
FunctionExpression> selector);
/**
* Projects each element of a sequence into a new
* form by incorporating the element's index.
*/
Queryable selectN(Queryable source,
FunctionExpression> selector);
/**
* Projects each element of a sequence to an
* {@code Enumerable} and combines the resulting sequences into one
* sequence.
*/
Queryable selectMany(Queryable source,
FunctionExpression>> selector);
/**
* Projects each element of a sequence to an
* {@code Enumerable} and combines the resulting sequences into one
* sequence. The index of each source element is used in the
* projected form of that element.
*/
Queryable selectManyN(Queryable source,
FunctionExpression>> selector);
/**
* Projects each element of a sequence to an
* {@code Enumerable} that incorporates the index of the source
* element that produced it. A result selector function is invoked
* on each element of each intermediate sequence, and the
* resulting values are combined into a single, one-dimensional
* sequence and returned.
*/
Queryable selectMany(Queryable source,
FunctionExpression>>
collectionSelector,
FunctionExpression> resultSelector);
/**
* Projects each element of a sequence to an
* {@code Enumerable} and invokes a result selector function on each
* element therein. The resulting values from each intermediate
* sequence are combined into a single, one-dimensional sequence
* and returned.
*/
Queryable selectManyN(Queryable source,
FunctionExpression>>
collectionSelector,
FunctionExpression> resultSelector);
/**
* Determines whether two sequences are equal by
* using the default equality comparer to compare
* elements.
*/
boolean sequenceEqual(Queryable source, Enumerable enumerable);
/**
* Determines whether two sequences are equal by
* using a specified EqualityComparer to compare
* elements.
*/
boolean sequenceEqual(Queryable source, Enumerable enumerable,
EqualityComparer comparer);
/**
* Returns the only element of a sequence, and throws
* an exception if there is not exactly one element in the
* sequence.
*/
T single(Queryable source);
/**
* Returns the only element of a sequence that
* satisfies a specified condition, and throws an exception if
* more than one such element exists.
*/
T single(Queryable source, FunctionExpression> predicate);
/**
* Returns the only element of a sequence, or a
* default value if the sequence is empty; this method throws an
* exception if there is more than one element in the
* sequence.
*/
T singleOrDefault(Queryable source);
/**
* Returns the only element of a sequence that
* satisfies a specified condition or a default value if no such
* element exists; this method throws an exception if more than
* one element satisfies the condition.
*/
T singleOrDefault(Queryable source,
FunctionExpression> predicate);
/**
* Bypasses a specified number of elements in a
* sequence and then returns the remaining elements.
*/
Queryable skip(Queryable source, int count);
/**
* Bypasses elements in a sequence as long as a
* specified condition is true and then returns the remaining
* elements.
*/
Queryable skipWhile(Queryable source,
FunctionExpression> predicate);
/**
* Bypasses elements in a sequence as long as a
* specified condition is true and then returns the remaining
* elements. The element's index is used in the logic of the
* predicate function.
*/
Queryable skipWhileN(Queryable source,
FunctionExpression