/* * Copyright 2016 Sai Pullabhotla. * * Licensed 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.jmethods.catatumbo.indexers; import java.util.List; import com.google.cloud.datastore.ListValue; import com.google.cloud.datastore.NullValue; import com.google.cloud.datastore.Value; import com.google.cloud.datastore.ValueType; import com.jmethods.catatumbo.Indexer; import com.jmethods.catatumbo.IndexerFactory; import com.jmethods.catatumbo.IndexingException; /** * An implementation of {@link Indexer} interface to create index on a list of Strings in upper * case. Each item in the list will be converted to upper case and then stored as an Array property * in the Cloud Datastore. * * @author Sai Pullabhotla * */ public class UpperCaseStringListIndexer implements Indexer { /** * Indexer for the items in the list */ private static final UpperCaseStringIndexer ITEM_INDEXER = IndexerFactory.getInstance() .getIndexer(UpperCaseStringIndexer.class); @Override public Value<?> index(Value<?> input) { if (input.getType() == ValueType.NULL) { return NullValue.of(); } try { ListValue.Builder builder = ListValue.newBuilder(); List<? extends Value<?>> list = ((ListValue) input).get(); for (Value<?> item : list) { builder.addValue(ITEM_INDEXER.index(item)); } return builder.build(); } catch (Exception exp) { throw new IndexingException(exp); } } }