QueryExpression.java

/*
 * Copyright (c) 2015 Spotify AB.
 *
 * 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 com.spotify.heroic.grammar;

import com.fasterxml.jackson.annotation.JsonTypeName;
import com.spotify.heroic.filter.Filter;
import com.spotify.heroic.metric.MetricType;
import lombok.Data;

import java.util.Map;
import java.util.Optional;

@Data
@JsonTypeName("query")
public class QueryExpression implements Expression {
    private final Context context;
    private final Optional<Expression> select;
    private final Optional<MetricType> source;
    private final Optional<RangeExpression> range;
    private final Optional<Filter> filter;
    private final Map<String, Expression> with;
    private final Map<String, Expression> as;

    @Override
    public Expression eval(final Scope scope) {
        final Map<String, Expression> with = Expression.evalMap(this.with, scope);
        final Map<String, Expression> as = Expression.evalMap(this.as, scope);

        return new QueryExpression(context, select.map(s -> s.eval(scope)), source,
            range.map(r -> r.eval(scope)), filter, with, as);
    }

    @Override
    public <R> R visit(final Visitor<R> visitor) {
        return visitor.visitQuery(this);
    }

    @Override
    public String toRepr() {
        return String.format("{select: %s source: %s, range: %s, filter: %s, with: %s, as: %s}",
            select, source, range, filter, with, as);
    }
}