org.mycore.datamodel.classifications2.MCRUnmappedCategoryRemover Maven / Gradle / Ivy
/*
* This file is part of *** M y C o R e ***
* See http://www.mycore.de/ for details.
*
* MyCoRe is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* MyCoRe is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with MyCoRe. If not, see .
*/
package org.mycore.datamodel.classifications2;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
/**
* Removes Categories which can not be mapped from a other classification.
*/
public class MCRUnmappedCategoryRemover {
private static final Logger LOGGER = LogManager.getLogger();
private final String classificationID;
// contains mappings like mir_genres:article -> marcgt:article
private HashMap toFromMapping;
private ArrayList filtered;
/**
* @param classificationID of the classification to filter
*/
public MCRUnmappedCategoryRemover(String classificationID) {
this.classificationID = classificationID;
this.initializeMapping();
}
public void filter() {
filtered = new ArrayList<>();
final MCRCategoryDAO dao = MCRCategoryDAOFactory.getInstance();
final MCRCategory category = dao
.getCategory(MCRCategoryID.fromString(classificationID), -1);
collectRemovableCategories(category);
filtered.forEach(categoryToDelete -> {
LOGGER.info("Delete Category {}", categoryToDelete);
dao.deleteCategory(categoryToDelete);
});
}
private boolean collectRemovableCategories(MCRCategory category) {
final MCRCategoryID categoryID = category.getId();
LOGGER.info("Filter Category: {}", categoryID);
boolean hasMapping = false;
if (toFromMapping.containsKey(categoryID)) {
hasMapping = true;
}
final List children = category.getChildren();
for (MCRCategory child : children) {
hasMapping = collectRemovableCategories(child) || hasMapping;
}
if (!hasMapping) {
filtered.add(categoryID);
// remove children from deleted list so we have only one delete operation for this category
children.stream()
.map(MCRCategory::getId)
.forEach(filtered::remove);
}
return hasMapping;
}
private void initializeMapping() {
toFromMapping = new HashMap<>();
final MCRCategoryDAO dao = MCRCategoryDAOFactory
.getInstance();
final List rootCategories = dao
.getRootCategories()
.stream()
.map(category -> dao.getRootCategory(category.getId(), -1))
.collect(Collectors.toList());
for (MCRCategory rootCategory : rootCategories) {
initializeMapping(rootCategory);
}
}
private void initializeMapping(MCRCategory category) {
final Optional mapping = category.getLabel("x-mapping");
LOGGER.info("Find mappings for category: {}", category.getId());
mapping.ifPresent(label -> {
final String[] mappingTargets = label.text.split(" ");
for (String mappingTarget : mappingTargets) {
final String[] kv = mappingTarget.split(":");
String clazz = kv[0];
if (classificationID.equals(clazz)) {
LOGGER.info("Found mapping from {} to {}", category.getId(), mappingTarget);
toFromMapping.put(MCRCategoryID.fromString(mappingTarget), category.getId());
}
}
});
category.getChildren().forEach(this::initializeMapping);
}
}