package org.elasticsearch.script.expression;
/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.
*/
import org.apache.lucene.queries.function.ValueSource;
import org.elasticsearch.index.fielddata.IndexFieldData;
import org.elasticsearch.search.MultiValueMode;
/**
* Expressions API for numeric fields.
*/
final class NumericField {
// no instance
private NumericField() {}
// supported variables
static final String VALUE_VARIABLE = "value";
static final String EMPTY_VARIABLE = "empty";
static final String LENGTH_VARIABLE = "length";
// supported methods
static final String GETVALUE_METHOD = "getValue";
static final String ISEMPTY_METHOD = "isEmpty";
static final String SIZE_METHOD = "size";
static final String MINIMUM_METHOD = "min";
static final String MAXIMUM_METHOD = "max";
static final String AVERAGE_METHOD = "avg";
static final String MEDIAN_METHOD = "median";
static final String SUM_METHOD = "sum";
static final String COUNT_METHOD = "count";
static ValueSource getVariable(IndexFieldData<?> fieldData, String fieldName, String variable) {
switch (variable) {
case VALUE_VARIABLE:
return new FieldDataValueSource(fieldData, MultiValueMode.MIN);
case EMPTY_VARIABLE:
return new EmptyMemberValueSource(fieldData);
case LENGTH_VARIABLE:
return new CountMethodValueSource(fieldData);
default:
throw new IllegalArgumentException("Member variable [" + variable + "] does not exist for " +
"numeric field [" + fieldName + "].");
}
}
static ValueSource getMethod(IndexFieldData<?> fieldData, String fieldName, String method) {
switch (method) {
case GETVALUE_METHOD:
return new FieldDataValueSource(fieldData, MultiValueMode.MIN);
case ISEMPTY_METHOD:
return new EmptyMemberValueSource(fieldData);
case SIZE_METHOD:
return new CountMethodValueSource(fieldData);
case MINIMUM_METHOD:
return new FieldDataValueSource(fieldData, MultiValueMode.MIN);
case MAXIMUM_METHOD:
return new FieldDataValueSource(fieldData, MultiValueMode.MAX);
case AVERAGE_METHOD:
return new FieldDataValueSource(fieldData, MultiValueMode.AVG);
case MEDIAN_METHOD:
return new FieldDataValueSource(fieldData, MultiValueMode.MEDIAN);
case SUM_METHOD:
return new FieldDataValueSource(fieldData, MultiValueMode.SUM);
case COUNT_METHOD:
return new CountMethodValueSource(fieldData);
default:
throw new IllegalArgumentException("Member method [" + method + "] does not exist for numeric field [" + fieldName + "].");
}
}
}