001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.juneau.commons.template;
018
019import java.util.*;
020
021/**
022 * The fields of one list's rows.
023 */
024public final class FieldCatalog {
025
026   private final Set<String> names;
027
028   private FieldCatalog(Set<String> names) {
029      this.names = names;
030   }
031
032   /**
033    * Creates a catalog from field names.
034    *
035    * @param names The names.  Must not be <jk>null</jk>.
036    * @return A new catalog.
037    */
038   public static FieldCatalog of(String...names) {
039      var s = new LinkedHashSet<String>();
040      for (var n : names)
041         s.add(new FieldDef(n).name());
042      return new FieldCatalog(Collections.unmodifiableSet(s));
043   }
044
045   /**
046    * Creates a catalog from field definitions.
047    *
048    * @param fields The fields.  Must not be <jk>null</jk>.
049    * @return A new catalog.
050    */
051   public static FieldCatalog of(FieldDef...fields) {
052      return of(Arrays.stream(fields).map(FieldDef::name).toArray(String[]::new));
053   }
054
055   /**
056    * Returns whether the catalog has this field.
057    *
058    * @param name The field name.
059    * @return <jk>true</jk> if declared.
060    */
061   public boolean has(String name) {
062      return names.contains(name);
063   }
064}