com.atlassian.jira.rest.client.domain.EntityHelper.java Source code

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Here is the source code for com.atlassian.jira.rest.client.domain.EntityHelper.java

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/*
 * Copyright (C) 2012 Atlassian
 *
 * 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.atlassian.jira.rest.client.domain;

import com.atlassian.jira.rest.client.IdentifiableEntity;
import com.atlassian.jira.rest.client.NamedEntity;
import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;

/**
 * Helper class for entities.
 *
 * @since v1.0
 */
public class EntityHelper {

    public static Function<IdentifiableEntity<String>, String> GET_ENTITY_STRING_ID_FUNCTION = new Function<IdentifiableEntity<String>, String>() {
        @Override
        public String apply(IdentifiableEntity<String> entity) {
            return entity.getId();
        }
    };

    public static Iterable<String> toNamesList(Iterable<? extends NamedEntity> items) {
        return Iterables.transform(items, new Function<NamedEntity, String>() {
            @Override
            public String apply(NamedEntity from) {
                return from.getName();
            }
        });
    }

    @SuppressWarnings("unused")
    public static <T> Iterable<String> toStringIdList(Iterable<IdentifiableEntity<T>> items) {
        return Iterables.transform(items, new Function<IdentifiableEntity<T>, String>() {
            @Override
            public String apply(IdentifiableEntity<T> from) {
                return from.getId() == null ? null : from.getId().toString();
            }
        });
    }

    public static <T extends NamedEntity> T findEntityByName(Iterable<T> entities, final String name) {
        return Iterables.find(entities, HasNamePredicate.forName(name));
    }

    @SuppressWarnings("unused")
    public static <T extends IdentifiableEntity<K>, K> T findEntityById(Iterable<T> entities, final K id) {
        return Iterables.find(entities, HasIdPredicate.forId(id));
    }

    public static class HasNamePredicate<T extends NamedEntity> implements Predicate<T> {

        private final String name;

        public static <K extends NamedEntity> HasNamePredicate<K> forName(String name) {
            return new HasNamePredicate<K>(name);
        }

        private HasNamePredicate(String name) {
            this.name = name;
        }

        @Override
        public boolean apply(T input) {
            return name.equals(input.getName());
        }
    }

    public static class HasIdPredicate<T extends IdentifiableEntity<K>, K> implements Predicate<T> {

        private final K id;

        public static <X extends IdentifiableEntity<Y>, Y> HasIdPredicate<X, Y> forId(Y id) {
            return new HasIdPredicate<X, Y>(id);
        }

        private HasIdPredicate(K id) {
            this.id = id;
        }

        @Override
        public boolean apply(T input) {
            return id.equals(input.getId());
        }
    }
}