Examples with Expression org.immutables.criteria.expression.Expression used on opensource projects

Example 1 with Expression

use of org.immutables.criteria.expression.Expression in project immutables by immutables.

the class SyncReader method select.

public SyncMapperTuple.DistinctLimitOffset select(Iterable<Projection<?>> projections) {
    Objects.requireNonNull(projections, "projections");
    Preconditions.checkArgument(!Iterables.isEmpty(projections), "empty projections");
    List<Expression> expressions = StreamSupport.stream(projections.spliterator(), false).map(Matchers::toExpression).collect(Collectors.toList());
    Query newQuery = this.query.addProjections(expressions);
    return new SyncMappers.MapperTuple(newQuery, session);
}

Example 2 with Expression

use of org.immutables.criteria.expression.Expression in project immutables by immutables.

the class ReactiveReader method select.

public ReactiveMapperTuple select(Iterable<Projection<?>> projections) {
    Objects.requireNonNull(projections, "projections");
    Preconditions.checkArgument(!Iterables.isEmpty(projections), "empty projections");
    List<Expression> expressions = StreamSupport.stream(projections.spliterator(), false).map(Matchers::toExpression).collect(Collectors.toList());
    Query newQuery = this.query.addProjections(expressions);
    return new ReactiveMapperTuple(newQuery, session);
}

Example 3 with Expression

use of org.immutables.criteria.expression.Expression in project immutables by immutables.

the class FindVisitor method visit.

@Override
public Bson visit(Call call) {
    final Operator op = call.operator();
    final List<Expression> args = call.arguments();
    if (op == OptionalOperators.IS_ABSENT || op == OptionalOperators.IS_PRESENT) {
        Preconditions.checkArgument(args.size() == 1, "Size should be 1 for %s but was %s", op, args.size());
        final String field = naming.name(Visitors.toPath(args.get(0)));
        Bson filter;
        if (op == OptionalOperators.IS_PRESENT) {
            filter = Filters.and(Filters.exists(field), Filters.ne(field, null));
        } else {
            // absent fields means null or missing
            filter = Filters.or(Filters.exists(field, false), Filters.eq(field, null));
        }
        return filter;
    }
    if (op == Operators.AND || op == Operators.OR) {
        final List<Bson> list = call.arguments().stream().map(a -> a.accept(this)).collect(Collectors.toList());
        return op == Operators.AND ? Filters.and(list) : Filters.or(list);
    }
    if (op == Operators.NOT) {
        return negate(args.get(0));
    }
    if (op == IterableOperators.IS_EMPTY || op == IterableOperators.NOT_EMPTY) {
        Preconditions.checkArgument(args.size() == 1, "Size should be 1 for %s but was %s", op, args.size());
        final String field = naming.name(Visitors.toPath(args.get(0)));
        return op == IterableOperators.IS_EMPTY ? Filters.eq(field, Collections.emptyList()) : Filters.and(Filters.exists(field), Filters.ne(field, null), Filters.ne(field, Collections.emptyList()));
    }
    if (op.arity() == Operator.Arity.BINARY) {
        return binaryCall(call);
    }
    throw new UnsupportedOperationException(String.format("Not yet supported (%s): %s", call.operator(), call));
}

Example 4 with Expression

use of org.immutables.criteria.expression.Expression in project immutables by immutables.

the class FindVisitor method binaryCall.

private Bson binaryCall(Call call) {
    Preconditions.checkArgument(call.operator().arity() == Operator.Arity.BINARY, "%s is not binary", call.operator());
    final Operator op = call.operator();
    Expression left = call.arguments().get(0);
    Expression right = call.arguments().get(1);
    if (!(left instanceof Path && right instanceof Constant)) {
        // special case when $expr has to be used
        return call.accept(new MongoExpr(naming, codecRegistry)).asDocument();
    }
    final String field = naming.name(Visitors.toPath(left));
    final Object value = Visitors.toConstant(right).value();
    if (op == Operators.EQUAL || op == Operators.NOT_EQUAL) {
        if ("".equals(value) && op == Operators.NOT_EQUAL) {
            // special case for empty string. string != "" should not return missing strings
            return Filters.and(Filters.nin(field, value, null), Filters.exists(field));
        }
        return op == Operators.EQUAL ? Filters.eq(field, value) : Filters.ne(field, value);
    }
    if (ComparableOperators.isComparable(op)) {
        if (op == ComparableOperators.GREATER_THAN) {
            return Filters.gt(field, value);
        } else if (op == ComparableOperators.GREATER_THAN_OR_EQUAL) {
            return Filters.gte(field, value);
        } else if (op == ComparableOperators.LESS_THAN) {
            return Filters.lt(field, value);
        } else if (op == ComparableOperators.LESS_THAN_OR_EQUAL) {
            return Filters.lte(field, value);
        }
        throw new UnsupportedOperationException("Unknown comparison " + call);
    }
    if (op == Operators.IN || op == Operators.NOT_IN) {
        final Collection<Object> values = ImmutableSet.copyOf(Visitors.toConstant(right).values());
        Preconditions.checkNotNull(values, "not expected to be null for %s", op);
        if (values.size() == 1) {
            // optimization: convert IN, NIN (where argument is a list with single element) into EQ / NE
            Operators newOperator = op == Operators.IN ? Operators.EQUAL : Operators.NOT_EQUAL;
            Call newCall = Expressions.binaryCall(newOperator, left, Expressions.constant(values.iterator().next()));
            return binaryCall(newCall);
        }
        return op == Operators.IN ? Filters.in(field, values) : Filters.nin(field, values);
    }
    if (op == StringOperators.MATCHES || op == StringOperators.CONTAINS) {
        Object newValue = value;
        if (op == StringOperators.CONTAINS) {
            // handle special case for string contains with regexp
            newValue = Pattern.compile(".*" + Pattern.quote(value.toString()) + ".*");
        }
        Preconditions.checkArgument(newValue instanceof Pattern, "%s is not regex pattern", value);
        return Filters.regex(field, (Pattern) newValue);
    }
    if (op == IterableOperators.HAS_SIZE) {
        Preconditions.checkArgument(value instanceof Number, "%s is not a number", value);
        int size = ((Number) value).intValue();
        return Filters.size(field, size);
    }
    if (op == IterableOperators.CONTAINS) {
        return Filters.eq(field, value);
    }
    if (op == StringOperators.HAS_LENGTH) {
        Preconditions.checkArgument(value instanceof Number, "%s is not a number", value);
        final int length = ((Number) value).intValue();
        // use strLenCP function
        // https://docs.mongodb.com/manual/reference/operator/aggregation/strLenCP/#exp._S_strLenCP
        final Bson lengthExpr = Document.parse(String.format("{$expr:{$eq:[{$strLenCP: \"$%s\"}, %d]}}}", field, length));
        // field should exists and not be null
        return Filters.and(Filters.exists(field), Filters.ne(field, null), lengthExpr);
    }
    if (op == StringOperators.STARTS_WITH || op == StringOperators.ENDS_WITH) {
        // regular expression
        final String pattern = String.format("%s%s%s", op == StringOperators.STARTS_WITH ? "^" : "", Pattern.quote(value.toString()), op == StringOperators.ENDS_WITH ? "$" : "");
        return Filters.regex(field, Pattern.compile(pattern));
    }
    throw new UnsupportedOperationException(String.format("Unsupported binary call %s", call));
}

Example 5 with Expression

use of org.immutables.criteria.expression.Expression in project immutables by immutables.

the class FindVisitor method negate.

/**
 * see https://docs.mongodb.com/manual/reference/operator/query/not/
 * NOT operator is mongo is a little specific and can't be applied on all levels
 * $not: { $or ... } will not work and should be transformed to $nor
 */
private Bson negate(Expression expression) {
    if (!(expression instanceof Call)) {
        return Filters.not(expression.accept(this));
    }
    Call notCall = (Call) expression;
    Operator notOperator = notCall.operator();
    if (notOperator == Operators.NOT) {
        // NOT NOT a == a
        return notCall.arguments().get(0).accept(this);
    } else if (notOperator == Operators.EQUAL) {
        return newCall(notCall, Operators.NOT_EQUAL);
    } else if (notOperator == Operators.NOT_EQUAL) {
        return newCall(notCall, Operators.EQUAL);
    } else if (notOperator == Operators.IN) {
        return newCall(notCall, Operators.NOT_IN);
    } else if (notOperator == Operators.NOT_IN) {
        return newCall(notCall, Operators.IN);
    } else if (notOperator == Operators.OR) {
        return Filters.nor(notCall.arguments().stream().map(a -> a.accept(this)).collect(Collectors.toList()));
    } else if (notOperator == Operators.AND) {
        // NOT A and B == (NOT A) or (NOT B)
        return Filters.or(notCall.arguments().stream().map(this::negate).collect(Collectors.toList()));
    } else if (notOperator == OptionalOperators.IS_ABSENT || notOperator == OptionalOperators.IS_PRESENT) {
        Operator newOp = notOperator == OptionalOperators.IS_ABSENT ? OptionalOperators.IS_PRESENT : OptionalOperators.IS_ABSENT;
        return newCall(notCall, newOp);
    } else if (notOperator == IterableOperators.IS_EMPTY || notOperator == IterableOperators.NOT_EMPTY) {
        Operator newOp = notOperator == IterableOperators.IS_EMPTY ? IterableOperators.NOT_EMPTY : IterableOperators.IS_EMPTY;
        return newCall(notCall, newOp);
    }
    // don't really know how to negate here
    return Filters.not(notCall.accept(this));
}