| /* |
| * 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 org.apache.solr.ltr; |
| |
| public class FeatureLoggerTestUtils { |
| |
| public static String toFeatureVector(String ... keysAndValues) { |
| return toFeatureVector( |
| CSVFeatureLogger.DEFAULT_KEY_VALUE_SEPARATOR, |
| CSVFeatureLogger.DEFAULT_FEATURE_SEPARATOR, |
| keysAndValues); |
| } |
| |
| public static String toFeatureVector(char keyValueSeparator, char featureSeparator, |
| String ... keysAndValues) { |
| StringBuilder sb = new StringBuilder(keysAndValues.length/2 * 3); |
| for (int ii = 0; ii+1 < keysAndValues.length; ii += 2) { |
| sb.append(keysAndValues[ii]) |
| .append(keyValueSeparator) |
| .append(keysAndValues[ii+1]) |
| .append(featureSeparator); |
| } |
| |
| final String features = (sb.length() > 0 ? |
| sb.substring(0, sb.length() - 1) : ""); |
| |
| return features; |
| } |
| |
| } |
