| /* |
| * 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.update.processor; |
| |
| import org.apache.solr.common.SolrInputField; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.lang.invoke.MethodHandles; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.List; |
| import java.util.Locale; |
| |
| /** |
| * Abstract subclass of FieldMutatingUpdateProcessor for implementing |
| * UpdateProcessors that will mutate all individual values of a selected |
| * field independently. If not all individual values are acceptable |
| * - i.e., mutateValue(srcVal) returns {@link #SKIP_FIELD_VALUE_LIST_SINGLETON} |
| * for at least one value - then none of the values are mutated: |
| * mutate(srcField) will return srcField. |
| * |
| * @see FieldMutatingUpdateProcessorFactory |
| * @see FieldValueMutatingUpdateProcessor |
| */ |
| public abstract class AllValuesOrNoneFieldMutatingUpdateProcessor extends FieldMutatingUpdateProcessor { |
| |
| private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass()); |
| |
| public static final Object DELETE_VALUE_SINGLETON = new Object() { |
| @Override |
| public String toString() { |
| return "!!Singleton Object Triggering Value Deletion!!"; |
| } |
| }; |
| |
| public static final Object SKIP_FIELD_VALUE_LIST_SINGLETON= new Object() { |
| @Override |
| public String toString() { |
| return "!!Singleton Object Triggering Skipping Field Mutation!!"; |
| } |
| }; |
| |
| |
| public AllValuesOrNoneFieldMutatingUpdateProcessor(FieldNameSelector selector, UpdateRequestProcessor next) { |
| super(selector, next); |
| } |
| |
| /** |
| * Mutates individual values of a field as needed, or returns the original |
| * value. |
| * |
| * @param srcVal a value from a matched field which should be mutated |
| * @return the value to use as a replacement for src, or |
| * <code>DELETE_VALUE_SINGLETON</code> to indicate that the value |
| * should be removed completely, or |
| * <code>SKIP_FIELD_VALUE_LIST_SINGLETON</code> to indicate that |
| * a field value is not consistent with |
| * @see #DELETE_VALUE_SINGLETON |
| * @see #SKIP_FIELD_VALUE_LIST_SINGLETON |
| */ |
| protected abstract Object mutateValue(final Object srcVal); |
| |
| protected final SolrInputField mutate(final SolrInputField srcField) { |
| Collection<Object> vals = srcField.getValues(); |
| if(vals== null || vals.isEmpty()) return srcField; |
| List<String> messages = null; |
| SolrInputField result = new SolrInputField(srcField.getName()); |
| for (final Object srcVal : vals) { |
| final Object destVal = mutateValue(srcVal); |
| if (SKIP_FIELD_VALUE_LIST_SINGLETON == destVal) { |
| if (log.isDebugEnabled()) { |
| log.debug("field '{}' {} value '{}' is not mutable, so no values will be mutated", |
| new Object[]{srcField.getName(), srcVal.getClass().getSimpleName(), srcVal}); |
| } |
| return srcField; |
| } |
| if (DELETE_VALUE_SINGLETON == destVal) { |
| if (log.isDebugEnabled()) { |
| if (null == messages) { |
| messages = new ArrayList<>(); |
| } |
| messages.add(String.format(Locale.ROOT, "removing value from field '%s': %s '%s'", |
| srcField.getName(), srcVal.getClass().getSimpleName(), srcVal)); |
| } |
| } else { |
| if (log.isDebugEnabled()) { |
| if (null == messages) { |
| messages = new ArrayList<>(); |
| } |
| messages.add(String.format(Locale.ROOT, "replace value from field '%s': %s '%s' with %s '%s'", |
| srcField.getName(), srcVal.getClass().getSimpleName(), srcVal, |
| destVal.getClass().getSimpleName(), destVal)); |
| } |
| result.addValue(destVal); |
| } |
| } |
| |
| if (null != messages && log.isDebugEnabled()) { |
| for (String message : messages) { |
| log.debug(message); |
| } |
| } |
| return 0 == result.getValueCount() ? null : result; |
| } |
| } |