/*
 * 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.brooklyn.core.entity.drivers.downloads;

import static com.google.common.base.Preconditions.checkNotNull;

import java.util.Map;

import org.apache.brooklyn.api.entity.drivers.EntityDriver;
import org.apache.brooklyn.api.entity.drivers.downloads.DownloadResolverManager.DownloadRequirement;
import org.apache.brooklyn.util.collections.MutableMap;

import com.google.common.base.Objects;
import com.google.common.collect.ImmutableMap;

public class BasicDownloadRequirement implements DownloadRequirement {

    private final EntityDriver entityDriver;
    private final String addonName;
    private final Map<String, ?> properties;

    /**
     * Copies the given DownloadRequirement, but overriding the original properties with the given additional properties.
     */
    public static BasicDownloadRequirement copy(DownloadRequirement req, Map<String,?> additionalProperties) {
        Map<String,?> props = MutableMap.<String,Object>builder().putAll(req.getProperties()).putAll(additionalProperties).build();
        if (req.getAddonName() == null) {
            return new BasicDownloadRequirement(req.getEntityDriver(), props);
        } else {
            return new BasicDownloadRequirement(req.getEntityDriver(), req.getAddonName(), props);
        }
    }

    public BasicDownloadRequirement(EntityDriver driver) {
        this(driver, ImmutableMap.<String,Object>of());
    }
    
    public BasicDownloadRequirement(EntityDriver driver, Map<String, ?> properties) {
        this.entityDriver = checkNotNull(driver, "entityDriver");
        this.addonName = null;
        this.properties = checkNotNull(properties, "properties");
    }
    
    public BasicDownloadRequirement(EntityDriver entityDriver, String addonName, Map<String, ?> properties) {
        this.entityDriver = checkNotNull(entityDriver, "entityDriver");
        this.addonName = checkNotNull(addonName, "addonName");
        this.properties = checkNotNull(properties, "properties");
    }

    @Override
    public EntityDriver getEntityDriver() {
        return entityDriver;
    }

    @Override
    public String getAddonName() {
        return addonName;
    }

    @Override
    public Map<String, ?> getProperties() {
        return properties;
    }
    
    @Override
    public String toString() {
        return Objects.toStringHelper(this).add("driver", entityDriver).add("addon", addonName).omitNullValues().toString();
    }
}