| /** |
| * 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.datatorrent.lib.appdata.schemas; |
| |
| import java.io.Serializable; |
| import java.util.Collection; |
| import java.util.List; |
| import java.util.Set; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.google.common.base.Preconditions; |
| import com.google.common.collect.Lists; |
| import com.google.common.collect.Sets; |
| |
| /** |
| * This is a somewhat vacuous class for managing field names for AppData schemas and queries. |
| * Its function is to maintain a set of field names with no null values. It also maintains a list |
| * of field names to increase iteration speed. |
| * @since 3.0.0 |
| */ |
| public class Fields implements Serializable |
| { |
| private static final long serialVersionUID = 201506251241L; |
| |
| /** |
| * Set of field names. |
| */ |
| private Set<String> fields; |
| /** |
| * List of field names. |
| */ |
| private List<String> fieldsList; |
| |
| /** |
| * Creats an empty set of fields. |
| */ |
| public Fields() |
| { |
| } |
| |
| /** |
| * Creates a set of fields from the given collection of fields. |
| * @param fields The collection object to create this {@link Fields} object from. |
| */ |
| public Fields(Collection<String> fields) |
| { |
| this.fields = Sets.newLinkedHashSet(); |
| |
| for (String field : fields) { |
| Preconditions.checkNotNull(field); |
| if (!this.fields.add(field)) { |
| throw new IllegalArgumentException("Duplicate field: " + field); |
| } |
| } |
| |
| fieldsList = Lists.newArrayList(); |
| fieldsList.addAll(fields); |
| } |
| |
| /** |
| * This gets the set of fields managed by this {@link Fields} object. |
| * @return The set of fields managed by this {@link Fields} object. |
| */ |
| public Set<String> getFields() |
| { |
| return fields; |
| } |
| |
| /** |
| * Gets the list of fields managed by this {@link Fields} object. |
| * @return The list of fields managed by this {@link Fields} object. |
| */ |
| public List<String> getFieldsList() |
| { |
| return fieldsList; |
| } |
| |
| @Override |
| public String toString() |
| { |
| return "Fields{" + "fields=" + fields + '}'; |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| int hash = 7; |
| hash = 43 * hash + (this.fields != null ? this.fields.hashCode() : 0); |
| return hash; |
| } |
| |
| @Override |
| public boolean equals(Object obj) |
| { |
| if (obj == null) { |
| return false; |
| } |
| if (getClass() != obj.getClass()) { |
| return false; |
| } |
| final Fields other = (Fields)obj; |
| if (this.fields != other.fields && (this.fields == null || !this.fields.equals(other.fields))) { |
| return false; |
| } |
| return true; |
| } |
| |
| private static final Logger LOG = LoggerFactory.getLogger(Fields.class); |
| } |