/*
 *  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.commons.compress.archivers.zip;

import java.io.InputStream;

import org.apache.commons.compress.parallel.InputStreamSupplier;

/**
 * A Thread-safe representation of a ZipArchiveEntry that is used to add entries to parallel archives.
 *
 * @since 1.10
 */
public class ZipArchiveEntryRequest {

    /**
     * Creates a ZipArchiveEntryRequest
     *
     * @param zipArchiveEntry The entry to use
     * @param payloadSupplier The payload that will be added to the ZIP entry.
     * @return The newly created request
     */
    public static ZipArchiveEntryRequest createZipArchiveEntryRequest(final ZipArchiveEntry zipArchiveEntry, final InputStreamSupplier payloadSupplier) {
        return new ZipArchiveEntryRequest(zipArchiveEntry, payloadSupplier);
    }

    /**
     * The ZIPArchiveEntry is not thread safe, and cannot be safely accessed by the getters of this class. It is safely accessible during the construction part
     * of this class and also after the thread pools have been shut down.
     */
    private final ZipArchiveEntry zipArchiveEntry;
    private final InputStreamSupplier payloadSupplier;

    private final int method;

    private ZipArchiveEntryRequest(final ZipArchiveEntry zipArchiveEntry, final InputStreamSupplier payloadSupplier) {
        // this constructor has "safe" access to all member variables on zipArchiveEntry
        this.zipArchiveEntry = zipArchiveEntry;
        this.payloadSupplier = payloadSupplier;
        this.method = zipArchiveEntry.getMethod();
    }

    /**
     * Gets the compression method to use
     *
     * @return The compression method to use
     */
    public int getMethod() {
        return method;
    }

    /**
     * Gets the payload that will be added to this ZIP entry
     *
     * @return The input stream.
     */
    public InputStream getPayloadStream() {
        return payloadSupplier.get();
    }

    /**
     * Gets the underlying entry. Do not use this method from threads that did not create the instance itself !
     *
     * @return the zipArchiveEntry that is basis for this request
     */
    ZipArchiveEntry getZipArchiveEntry() {
        return zipArchiveEntry;
    }
}
