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/*
 * 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.eclipse.aether.installation;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;

import org.eclipse.aether.RepositorySystem;
import org.eclipse.aether.RequestTrace;
import org.eclipse.aether.artifact.Artifact;
import org.eclipse.aether.metadata.Metadata;

/**
 * A request to install artifacts and their accompanying metadata into the local repository.
 *
 * @see RepositorySystem#install(RepositorySystemSession, InstallRequest)
 */
public final class InstallRequest {

    private Collection artifacts = Collections.emptyList();

    private Collection metadata = Collections.emptyList();

    private RequestTrace trace;

    /**
     * Creates an uninitialized request.
     */
    public InstallRequest() {}

    /**
     * Gets the artifact to install.
     *
     * @return The artifacts to install, never {@code null}.
     */
    public Collection getArtifacts() {
        return artifacts;
    }

    /**
     * Sets the artifacts to install.
     *
     * @param artifacts The artifacts to install, may be {@code null}.
     * @return This request for chaining, never {@code null}.
     */
    public InstallRequest setArtifacts(Collection artifacts) {
        if (artifacts == null) {
            this.artifacts = Collections.emptyList();
        } else {
            this.artifacts = artifacts;
        }
        return this;
    }

    /**
     * Adds the specified artifacts for installation.
     *
     * @param artifact The artifact to add, may be {@code null}.
     * @return This request for chaining, never {@code null}.
     */
    public InstallRequest addArtifact(Artifact artifact) {
        if (artifact != null) {
            if (artifacts.isEmpty()) {
                artifacts = new ArrayList<>();
            }
            artifacts.add(artifact);
        }
        return this;
    }

    /**
     * Gets the metadata to install.
     *
     * @return The metadata to install, never {@code null}.
     */
    public Collection getMetadata() {
        return metadata;
    }

    /**
     * Sets the metadata to install.
     *
     * @param metadata The metadata to install.
     * @return This request for chaining, never {@code null}.
     */
    public InstallRequest setMetadata(Collection metadata) {
        if (metadata == null) {
            this.metadata = Collections.emptyList();
        } else {
            this.metadata = metadata;
        }
        return this;
    }

    /**
     * Adds the specified metadata for installation.
     *
     * @param metadata The metadata to add, may be {@code null}.
     * @return This request for chaining, never {@code null}.
     */
    public InstallRequest addMetadata(Metadata metadata) {
        if (metadata != null) {
            if (this.metadata.isEmpty()) {
                this.metadata = new ArrayList<>();
            }
            this.metadata.add(metadata);
        }
        return this;
    }

    /**
     * Gets the trace information that describes the higher level request/operation in which this request is issued.
     *
     * @return The trace information about the higher level operation or {@code null} if none.
     */
    public RequestTrace getTrace() {
        return trace;
    }

    /**
     * Sets the trace information that describes the higher level request/operation in which this request is issued.
     *
     * @param trace The trace information about the higher level operation, may be {@code null}.
     * @return This request for chaining, never {@code null}.
     */
    public InstallRequest setTrace(RequestTrace trace) {
        this.trace = trace;
        return this;
    }

    @Override
    public String toString() {
        return getArtifacts() + ", " + getMetadata();
    }
}