AggregateFactory.java

/*
 * Copyright 2014, Tuplejump Inc.
 *
 * Licensed 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.tuplejump.stargate.lucene.query.function;

import com.tuplejump.stargate.lucene.Type;
import org.codehaus.jackson.annotate.JsonAnyGetter;
import org.codehaus.jackson.annotate.JsonAnySetter;
import org.codehaus.jackson.annotate.JsonProperty;

import java.util.HashMap;
import java.util.Map;

/**
 * User: satya
 */
public class AggregateFactory {
    protected String type;
    private String alias;
    private String field;
    protected boolean distinct;
    protected Map<String, String> dynamicProperties = new HashMap<>();

    public AggregateFactory(@JsonProperty("type") String type, @JsonProperty("alias") String alias, @JsonProperty("field") String field, @JsonProperty("distinct") boolean distinct) {
        this.type = type;
        this.alias = alias;
        this.field = field;
        this.distinct = distinct;
    }

    @JsonAnyGetter
    public Map<String, String> dynamicProperties() {
        return dynamicProperties;
    }

    @JsonAnySetter
    public void set(String name, String value) {
        dynamicProperties.put(name, value);
    }

    public Aggregate getAggregate(Type valueType) {
        if (field == null && distinct)
            throw new UnsupportedOperationException("Distinct cannot be specified when field is null");
        if ("count".equalsIgnoreCase(type)) return new Count(this, distinct);
        else if ("sum".equalsIgnoreCase(type)) return new Sum(this, valueType, distinct);
        else if ("min".equalsIgnoreCase(type)) return new MinMax(this, valueType.isNumeric());
        else if ("max".equalsIgnoreCase(type)) return new MinMax(this, valueType.isNumeric(), true);
        else if ("values".equalsIgnoreCase(type)) return new Values(this, distinct);
        else if ("quantile".equalsIgnoreCase(type)) return new Quantile(this, valueType);
        else throw new UnsupportedOperationException("Unknown function [" + type + "]");
    }

    public String getField() {
        return field != null ? field.toLowerCase() : null;
    }

    public String getAlias() {
        return alias != null ? alias : type;
    }

    public String getType() {
        return type;
    }
}