/
ColumnCondition.java
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/
ColumnCondition.java
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/*
*
* Copyright (c) 2022 Contributors to the Eclipse Foundation
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and Apache License v2.0 which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Apache License v2.0 is available at http://www.opensource.org/licenses/apache2.0.php.
*
* You may elect to redistribute this code under either of these licenses.
*
* Contributors:
*
* Otavio Santana
*
*/
package org.eclipse.jnosql.communication.semistructured;
import org.eclipse.jnosql.communication.Condition;
import org.eclipse.jnosql.communication.TypeReference;
import org.eclipse.jnosql.communication.Value;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.stream.StreamSupport;
import static java.util.Arrays.asList;
import static java.util.Objects.requireNonNull;
/**
* It is the state of column queries, with a condition and a value, as a {@link Column},
* where both combined define a predicate.
*
* @see ColumnManager#select(ColumnQuery)
* @see Condition
*/
public final class ColumnCondition {
private final Column column;
private final Condition condition;
private final boolean readOnly;
private ColumnCondition(Column column, Condition condition) {
this.column = column;
this.condition = condition;
this.readOnly = false;
}
private ColumnCondition(Column column, Condition condition, boolean readOnly) {
this.column = column;
this.condition = condition;
this.readOnly = readOnly;
}
/**
* Gets the column to be used in the select
*
* @return a column instance
*/
public Column column() {
return column;
}
/**
* Gets the conditions to be used in the select
*
* @return a Condition instance
* @see Condition
*/
public Condition condition() {
return condition;
}
/**
* Creates a new {@link ColumnCondition} using the {@link Condition#AND}
*
* @param condition the condition to be aggregated
* @return the conditions joined as AND
* @throws NullPointerException when the condition is null
*/
public ColumnCondition and(ColumnCondition condition) {
validateReadOnly();
requireNonNull(condition, "Conditions is required");
if (Condition.AND.equals(this.condition)) {
Column newColumn = getConditions(condition, Condition.AND);
return new ColumnCondition(newColumn, Condition.AND);
}
return ColumnCondition.and(this, condition);
}
/**
* Creates a new {@link ColumnCondition} negating the current one
*
* @return the negated condition
* @see Condition#NOT
*/
public ColumnCondition negate() {
validateReadOnly();
if (Condition.NOT.equals(this.condition)) {
return this.column.get(ColumnCondition.class);
} else {
Column newColumn = Column.of(Condition.NOT.getNameField(), this);
return new ColumnCondition(newColumn, Condition.NOT);
}
}
/**
* Creates a new {@link ColumnCondition} using the {@link Condition#OR}
*
* @param condition the condition to be aggregated
* @return the conditions joined as AND
* @throws NullPointerException when the condition is null
*/
public ColumnCondition or(ColumnCondition condition) {
validateReadOnly();
requireNonNull(condition, "Condition is required");
if (Condition.OR.equals(this.condition)) {
Column newColumn = getConditions(condition, Condition.OR);
return new ColumnCondition(newColumn, Condition.OR);
}
return ColumnCondition.or(this, condition);
}
private Column getConditions(ColumnCondition columnCondition, Condition condition) {
List<ColumnCondition> conditions = new ArrayList<>(column.get(new TypeReference<List<ColumnCondition>>() {
}));
conditions.add(columnCondition);
return Column.of(condition.getNameField(), conditions);
}
private void validateReadOnly() {
if (readOnly) {
throw new IllegalStateException("You cannot change the status after building the query");
}
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
ColumnCondition that = (ColumnCondition) o;
return Objects.equals(column, that.column)
&& condition == that.condition;
}
@Override
public int hashCode() {
return Objects.hash(column, condition);
}
@Override
public String toString() {
return "ColumnCondition{" + "column=" + column +
", condition=" + condition +
'}';
}
public static ColumnCondition readOnly(ColumnCondition condition) {
requireNonNull(condition, "condition is required");
return new ColumnCondition(condition.column(), condition.condition(), true);
}
static ColumnCondition of(Column column, Condition condition) {
return new ColumnCondition(requireNonNull(column, "Column is required"), condition);
}
/**
* Creates a {@link ColumnCondition} that has a {@link Condition#EQUALS}, it means a select will scanning to a
* column family that has the same name and equals value informed in this column.
*
* @param column a column instance
* @return a {@link ColumnCondition} with {@link Condition#EQUALS}
* @throws NullPointerException when column is null
*/
public static ColumnCondition eq(Column column) {
return new ColumnCondition(column, Condition.EQUALS);
}
/**
* an alias method to {@link ColumnCondition#eq(Column)} where it will create a {@link Column}
* instance first and then apply te condition.
*
* @param name the name of the column
* @param value the column information
* @return a {@link ColumnCondition} with {@link Condition#EQUALS}
* @throws NullPointerException when either name or value is null
*/
public static ColumnCondition eq(String name, Object value) {
Objects.requireNonNull(name, "name is required");
Objects.requireNonNull(value, "value is required");
return eq(Column.of(name, value));
}
/**
* Creates a {@link ColumnCondition} that has a {@link Condition#GREATER_THAN}, it means a select will scanning to a
* column family that has the same name and the value greater than informed in this column.
*
* @param column a column instance
* @return a {@link ColumnCondition} with {@link Condition#GREATER_THAN}
* @throws NullPointerException when column is null
*/
public static ColumnCondition gt(Column column) {
return new ColumnCondition(column, Condition.GREATER_THAN);
}
/**
* an alias method to {@link ColumnCondition#gt(Column)} where it will create a {@link Column}
* instance first and then apply te condition.
*
* @param name the name of the column
* @param value the column information
* @return a {@link ColumnCondition} with {@link Condition#GREATER_THAN}
* @throws NullPointerException when either name or value is null
*/
public static ColumnCondition gt(String name, Object value) {
Objects.requireNonNull(name, "name is required");
Objects.requireNonNull(value, "value is required");
return gt(Column.of(name, value));
}
/**
* Creates a {@link ColumnCondition} that has a {@link Condition#GREATER_EQUALS_THAN},
* it means a select will scanning to a column family that has the same name and the value
* greater or equals than informed in this column.
*
* @param column a column instance
* @return a {@link ColumnCondition} with {@link Condition#GREATER_EQUALS_THAN}
* @throws NullPointerException when column is null
*/
public static ColumnCondition gte(Column column) {
return new ColumnCondition(column, Condition.GREATER_EQUALS_THAN);
}
/**
* an alias method to {@link ColumnCondition#gte(Column)} where it will create a {@link Column}
* instance first and then apply te condition.
*
* @param name the name of the column
* @param value the column information
* @return a {@link ColumnCondition} with {@link Condition#GREATER_EQUALS_THAN}
* @throws NullPointerException when either name or value is null
*/
public static ColumnCondition gte(String name, Object value) {
Objects.requireNonNull(name, "name is required");
Objects.requireNonNull(value, "value is required");
return gte(Column.of(name, value));
}
/**
* Creates a {@link ColumnCondition} that has a {@link Condition#LESSER_THAN}, it means a select will scanning to a
* column family that has the same name and the value lesser than informed in this column.
*
* @param column a column instance
* @return a {@link ColumnCondition} with {@link Condition#LESSER_THAN}
* @throws NullPointerException when column is null
*/
public static ColumnCondition lt(Column column) {
return new ColumnCondition(column, Condition.LESSER_THAN);
}
/**
* an alias method to {@link ColumnCondition#lt(Column)} where it will create a {@link Column}
* instance first and then apply te condition.
*
* @param name the name of the column
* @param value the column information
* @return a {@link ColumnCondition} with {@link Condition#LESSER_THAN}
* @throws NullPointerException when either name or value is null
*/
public static ColumnCondition lt(String name, Object value) {
Objects.requireNonNull(name, "name is required");
Objects.requireNonNull(value, "value is required");
return lt(Column.of(name, value));
}
/**
* Creates a {@link ColumnCondition} that has a {@link Condition#LESSER_EQUALS_THAN},
* it means a select will scanning to a column family that has the same name and the value
* lesser or equals than informed in this column.
*
* @param column a column instance
* @return a {@link ColumnCondition} with {@link Condition#LESSER_EQUALS_THAN}
* @throws NullPointerException when column is null
*/
public static ColumnCondition lte(Column column) {
return new ColumnCondition(column, Condition.LESSER_EQUALS_THAN);
}
/**
* an alias method to {@link ColumnCondition#lte(Column)} where it will create a {@link Column}
* instance first and then apply te condition.
*
* @param name the name of the column
* @param value the column information
* @return a {@link ColumnCondition} with {@link Condition#LESSER_EQUALS_THAN}
* @throws NullPointerException when either name or value is null
*/
public static ColumnCondition lte(String name, Object value) {
Objects.requireNonNull(name, "name is required");
Objects.requireNonNull(value, "value is required");
return lte(Column.of(name, value));
}
/**
* Creates a {@link ColumnCondition} that has a {@link Condition#IN}, it means a select will scanning to a
* column family that has the same name and the value is within informed in this column.
*
* @param column a column instance
* @return a {@link ColumnCondition} with {@link Condition#IN}
* @throws NullPointerException when column is null
* @throws IllegalArgumentException when the {@link Column#get()} in not an iterable implementation
*/
public static ColumnCondition in(Column column) {
Objects.requireNonNull(column, "column is required");
checkInClause(column.value());
return new ColumnCondition(column, Condition.IN);
}
/**
* an alias method to {@link ColumnCondition#in(Column)} where it will create a {@link Column}
* instance first and then apply te condition.
*
* @param name the name of the column
* @param value the column information
* @return a {@link ColumnCondition} with {@link Condition#IN}
* @throws NullPointerException when either name or value is null
*/
public static ColumnCondition in(String name, Object value) {
Objects.requireNonNull(name, "name is required");
Objects.requireNonNull(value, "value is required");
return in(Column.of(name, value));
}
/**
* Creates a {@link ColumnCondition} that has a {@link Condition#LIKE}, it means a select will scanning to a
* column family that has the same name and the value is like than informed in this column.
*
* @param column a column instance
* @return a {@link ColumnCondition} with {@link Condition#LIKE}
* @throws NullPointerException when column is null
*/
public static ColumnCondition like(Column column) {
return new ColumnCondition(column, Condition.LIKE);
}
/**
* an alias method to {@link ColumnCondition#like(Column)} where it will create a {@link Column}
* instance first and then apply te condition.
*
* @param name the name of the column
* @param value the column information
* @return a {@link ColumnCondition} with {@link Condition#LIKE}
* @throws NullPointerException when either name or value is null
*/
public static ColumnCondition like(String name, Object value) {
Objects.requireNonNull(name, "name is required");
Objects.requireNonNull(value, "value is required");
return like(Column.of(name, value));
}
/**
* Creates a {@link ColumnCondition} that has a {@link Condition#BETWEEN},
* it means a select will scanning to a column family that is between two values informed
* on a column name.
* The column must have a {@link Column#get()} an {@link Iterable} implementation
* with just two elements.
*
* @param column a column instance
* @return The between condition
* @throws NullPointerException when column is null
* @throws IllegalArgumentException When the column neither has an Iterable instance or two elements on
* an Iterable.
*/
public static ColumnCondition between(Column column) {
Objects.requireNonNull(column, "column is required");
checkBetweenClause(column.get());
return new ColumnCondition(column, Condition.BETWEEN);
}
/**
* an alias method to {@link ColumnCondition#between(Column)} (Column) where it will create a {@link Column}
* instance first and then apply te condition.
*
* @param name the name of the column
* @param value the column information
* @return a {@link ColumnCondition} with {@link Condition#BETWEEN}
* @throws NullPointerException when either name or value is null
*/
public static ColumnCondition between(String name, Object value) {
Objects.requireNonNull(name, "name is required");
Objects.requireNonNull(value, "value is required");
return between(Column.of(name, value));
}
/**
* Returns a predicate that is the negation of the supplied predicate.
* This is accomplished by returning result of the calling target.negate().
*
* @param condition the condition
* @return a condition that negates the results of the supplied predicate
* @throws NullPointerException when condition is null
*/
public static ColumnCondition not(ColumnCondition condition) {
Objects.requireNonNull(condition, "condition is required");
return condition.negate();
}
/**
* Returns a new {@link ColumnCondition} aggregating ,as "AND", all the conditions as just one condition.
* The {@link Column} will storage the {@link Condition#getNameField()} as key and the value will be
* the {@link java.util.List} of all conditions, in other words.
* <p>Given:</p>
* {@code
* Column age = Column.of("age", 26);
* Column name = Column.of("name", "otavio");
* ColumnCondition condition = ColumnCondition.eq(name).and(ColumnCondition.gte(age));
* }
* The {@link ColumnCondition#column()} will have "_AND" as key and the list of condition as value.
*
* @param conditions the conditions to be aggregated
* @return the new {@link ColumnCondition} instance
* @throws NullPointerException when the conditions are null
*/
public static ColumnCondition and(ColumnCondition... conditions) {
requireNonNull(conditions, "condition is required");
Column column = Column.of(Condition.AND.getNameField(), asList(conditions));
return ColumnCondition.of(column, Condition.AND);
}
/**
* Returns a new {@link ColumnCondition} aggregating ,as "OR", all the conditions as just one condition.
* The {@link Column} will storage the {@link Condition#getNameField()} as key and the value gonna be
* the {@link java.util.List} of all conditions, in other words.
* <p>Given:</p>
* {@code
* Column age = Column.of("age", 26);
* Column name = Column.of("name", "otavio");
* ColumnCondition condition = ColumnCondition.eq(name).or(ColumnCondition.gte(age));
* }
* The {@link ColumnCondition#column()} will have "_OR" as key and the list of condition as value.
*
* @param conditions the conditions to be aggregated
* @return the new {@link ColumnCondition} instance
* @throws NullPointerException when the condition is null
*/
public static ColumnCondition or(ColumnCondition... conditions) {
requireNonNull(conditions, "condition is required");
Column column = Column.of(Condition.OR.getNameField(), asList(conditions));
return ColumnCondition.of(column, Condition.OR);
}
private static void checkInClause(Value value) {
if (!value.isInstanceOf(Iterable.class)) {
throw new IllegalArgumentException("On ColumnCondition#in you must use an iterable" +
" instead of class: " + value.getClass().getName());
}
}
private static void checkBetweenClause(Object value) {
if (Iterable.class.isInstance(value)) {
long count = (int) StreamSupport.stream(Iterable.class.cast(value).spliterator(), false).count();
if (count != 2) {
throw new IllegalArgumentException("On ColumnCondition#between you must use an iterable" +
" with two elements");
}
} else {
throw new IllegalArgumentException("On ColumnCondition#between you must use an iterable" +
" with two elements instead of class: " + value.getClass().getName());
}
}
}