/*
 *  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.sevenz;

import java.util.LinkedList;

The unit of solid compression.
/**
 * The unit of solid compression.
 */
class Folder {
    /// List of coders used in this folder, eg. one for compression, one for encryption.
    Coder[] coders;
    /// Total number of input streams across all coders.
    /// this field is currently unused but technically part of the 7z API
    long totalInputStreams;
    /// Total number of output streams across all coders.
    long totalOutputStreams;
    /// Mapping between input and output streams.
    BindPair[] bindPairs;
    /// Indeces of input streams, one per input stream not listed in bindPairs.
    long[] packedStreams;
    /// Unpack sizes, per each output stream.
    long[] unpackSizes;
    /// Whether the folder has a CRC.
    boolean hasCrc;
    /// The CRC, if present.
    long crc;
    /// The number of unpack substreams, product of the number of
    /// output streams and the nuber of non-empty files in this
    /// folder.
    int numUnpackSubStreams;

    
Sorts Coders using bind pairs.
The first coder reads from the packed stream (we currently
only support single input stream decoders), the second reads
from the output of the first and so on.
/**
     * Sorts Coders using bind pairs.
     * <p>The first coder reads from the packed stream (we currently
     * only support single input stream decoders), the second reads
     * from the output of the first and so on.</p>
     */
    Iterable<Coder> getOrderedCoders() {
        final LinkedList<Coder> l = new LinkedList<>();
        int current = (int) packedStreams[0]; // more that 2^31 coders?
        while (current != -1) {
            l.addLast(coders[current]);
            final int pair = findBindPairForOutStream(current);
            current = pair != -1 ? (int) bindPairs[pair].inIndex : -1;
        }
        return l;
    }

    int findBindPairForInStream(final int index) {
        for (int i = 0; i < bindPairs.length; i++) {
            if (bindPairs[i].inIndex == index) {
                return i;
            }
        }
        return -1;
    }

    int findBindPairForOutStream(final int index) {
        for (int i = 0; i < bindPairs.length; i++) {
            if (bindPairs[i].outIndex == index) {
                return i;
            }
        }
        return -1;
    }

    long getUnpackSize() {
        if (totalOutputStreams == 0) {
            return 0;
        }
        for (int i = ((int)totalOutputStreams) - 1; i >= 0; i--) {
            if (findBindPairForOutStream(i) < 0) {
                return unpackSizes[i];
            }
        }
        return 0;
    }

    long getUnpackSizeForCoder(final Coder coder) {
        if (coders != null) {
            for (int i = 0; i < coders.length; i++) {
                if (coders[i] == coder) {
                    return unpackSizes[i];
                }
            }
        }
        return 0;
    }

    @Override
    public String toString() {
        return "Folder with " + coders.length + " coders, " + totalInputStreams
            + " input streams, " + totalOutputStreams + " output streams, "
            + bindPairs.length + " bind pairs, " + packedStreams.length
            + " packed streams, " + unpackSizes.length + " unpack sizes, "
            + (hasCrc ? "with CRC " + crc : "without CRC")
            + " and " + numUnpackSubStreams + " unpack streams";
    }
}