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Graylog
There is a newer version: 6.0.0
/**
 * This file is part of Graylog.
 *
 * Graylog is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Graylog is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Graylog.  If not, see .
 */
package org.graylog.events.conditions;

import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonSubTypes;
import com.fasterxml.jackson.annotation.JsonTypeInfo;

@JsonTypeInfo(
        use = JsonTypeInfo.Id.NAME,
        include = JsonTypeInfo.As.EXISTING_PROPERTY,
        property = Expression.FIELD_EXPR,
        visible = true
)
@JsonSubTypes({
        @JsonSubTypes.Type(value = Expr.True.class, name = Expr.True.EXPR),
        @JsonSubTypes.Type(value = Expr.And.class, name = Expr.And.EXPR),
        @JsonSubTypes.Type(value = Expr.Or.class, name = Expr.Or.EXPR),
        @JsonSubTypes.Type(value = Expr.Not.class, name = Expr.Not.EXPR),
        @JsonSubTypes.Type(value = Expr.Equal.class, name = Expr.Equal.EXPR),
        @JsonSubTypes.Type(value = Expr.Greater.class, name = Expr.Greater.EXPR),
        @JsonSubTypes.Type(value = Expr.GreaterEqual.class, name = Expr.GreaterEqual.EXPR),
        @JsonSubTypes.Type(value = Expr.Lesser.class, name = Expr.Lesser.EXPR),
        @JsonSubTypes.Type(value = Expr.LesserEqual.class, name = Expr.LesserEqual.EXPR),
        @JsonSubTypes.Type(value = Expr.NumberValue.class, name = Expr.NumberValue.EXPR),
        @JsonSubTypes.Type(value = Expr.NumberReference.class, name = Expr.NumberReference.EXPR),
        @JsonSubTypes.Type(value = Expr.Group.class, name = Expr.Group.EXPR),
})
public interface Expression {
    String FIELD_EXPR = "expr";

    @JsonProperty(FIELD_EXPR)
    String expr();

    @JsonIgnore
    T accept(ExpressionVisitor visitor);
}