| /* |
| * 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.sysds.api.mlcontext; |
| |
| import java.util.Arrays; |
| import java.util.List; |
| import java.util.stream.Collectors; |
| |
| import org.apache.commons.lang3.StringUtils; |
| import org.apache.sysds.common.Types.ValueType; |
| |
| /** |
| * The frame schema, stored as a list of {@code ValueType} values. |
| * |
| */ |
| public class FrameSchema { |
| |
| private List<ValueType> schema = null; |
| |
| public FrameSchema() { |
| } |
| |
| /** |
| * Constructor that specifies the schema as a list of {@code ValueType} |
| * values. |
| * |
| * @param schema |
| * the frame schema |
| */ |
| public FrameSchema(List<ValueType> schema) { |
| this.schema = schema; |
| } |
| |
| /** |
| * Constructor that specifies the schema as a comma-separated string. |
| * |
| * @param schema |
| * the frame schema as a string |
| */ |
| public FrameSchema(String schema) { |
| this.schema = schemaStringToListOfValueTypes(schema); |
| } |
| |
| /** |
| * Obtain the frame schema |
| * |
| * @return the frame schema as a list of {@code ValueType} values |
| */ |
| public List<ValueType> getSchema() { |
| return schema; |
| } |
| |
| /** |
| * Set the frame schema |
| * |
| * @param schema |
| * the frame schema |
| */ |
| public void setSchema(List<ValueType> schema) { |
| this.schema = schema; |
| } |
| |
| /** |
| * Set the frame schema, specifying the frame schema as a comma-separated |
| * string |
| * |
| * @param schema |
| * the frame schema as a string |
| */ |
| public void setSchemaAsString(String schema) { |
| this.schema = schemaStringToListOfValueTypes(schema); |
| } |
| |
| /** |
| * Convert a schema string to a list of {@code ValueType} values |
| * |
| * @param schemaString |
| * the frame schema as a string |
| * @return the frame schema as a list of {@code ValueType} values |
| */ |
| private static List<ValueType> schemaStringToListOfValueTypes(String schemaString) { |
| if (StringUtils.isBlank(schemaString)) |
| return null; |
| return Arrays.stream(schemaString.split(",")) |
| .map(s -> ValueType.valueOf(s.toUpperCase())) |
| .collect(Collectors.toList()); |
| } |
| |
| /** |
| * Obtain the schema as a comma-separated string |
| * |
| * @return the frame schema as a string |
| */ |
| public String getSchemaAsString() { |
| if ((schema == null) || (schema.size() == 0)) { |
| return null; |
| } |
| StringBuilder sb = new StringBuilder(); |
| for (int i = 0; i < schema.size(); i++) { |
| ValueType vt = schema.get(i); |
| sb.append(vt); |
| if (i + 1 < schema.size()) { |
| sb.append(","); |
| } |
| } |
| return sb.toString(); |
| } |
| } |