com.netflix.genie.server.repository.jpa.ApplicationSpecs.java Source code

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Here is the source code for com.netflix.genie.server.repository.jpa.ApplicationSpecs.java

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/*
 * Copyright 2015 Netflix, Inc.
 *
 *      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.netflix.genie.server.repository.jpa;

import com.netflix.genie.common.model.Application;
import com.netflix.genie.common.model.ApplicationStatus;
import com.netflix.genie.common.model.Application_;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Root;

import org.apache.commons.lang3.StringUtils;
import org.springframework.data.jpa.domain.Specification;

/**
 * Specifications for JPA queries.
 *
 * @see <a href="http://tinyurl.com/n6nubvm">Docs</a>
 * @author tgianos
 */
public final class ApplicationSpecs {

    /**
     * Private constructor for utility class.
     */
    protected ApplicationSpecs() {
    }

    /**
     * Get a specification using the specified parameters.
     *
     * @param name     The name of the application
     * @param userName The name of the user who created the application
     * @param statuses The status of the application
     * @param tags     The set of tags to search the command for
     * @return A specification object used for querying
     */
    public static Specification<Application> find(final String name, final String userName,
            final Set<ApplicationStatus> statuses, final Set<String> tags) {
        return new Specification<Application>() {
            @Override
            public Predicate toPredicate(final Root<Application> root, final CriteriaQuery<?> cq,
                    final CriteriaBuilder cb) {
                final List<Predicate> predicates = new ArrayList<>();
                if (StringUtils.isNotBlank(name)) {
                    predicates.add(cb.equal(root.get(Application_.name), name));
                }
                if (StringUtils.isNotBlank(userName)) {
                    predicates.add(cb.equal(root.get(Application_.user), userName));
                }
                if (statuses != null && !statuses.isEmpty()) {
                    //Could optimize this as we know size could use native array
                    final List<Predicate> orPredicates = new ArrayList<>();
                    for (final ApplicationStatus status : statuses) {
                        orPredicates.add(cb.equal(root.get(Application_.status), status));
                    }
                    predicates.add(cb.or(orPredicates.toArray(new Predicate[orPredicates.size()])));
                }
                if (tags != null) {
                    for (final String tag : tags) {
                        if (StringUtils.isNotBlank(tag)) {
                            predicates.add(cb.isMember(tag, root.get(Application_.tags)));
                        }
                    }
                }
                return cb.and(predicates.toArray(new Predicate[predicates.size()]));
            }
        };
    }
}