edu.jhu.hlt.acute.iterators.zip.ZipArchiveEntryByteIterator.java Source code

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Here is the source code for edu.jhu.hlt.acute.iterators.zip.ZipArchiveEntryByteIterator.java

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/*
 * Copyright 2012-2015 Johns Hopkins University HLTCOE. All rights reserved.
 * See LICENSE in the project root directory.
 */
package edu.jhu.hlt.acute.iterators.zip;

import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Path;
import java.util.Enumeration;

import org.apache.commons.compress.archivers.zip.ZipArchiveEntry;
import org.apache.commons.compress.archivers.zip.ZipFile;
import org.apache.commons.compress.utils.IOUtils;

import edu.jhu.hlt.utilt.AutoCloseableIterator;

/**
 * A class that provides the ability to iterate over all files in a
 * <code>.zip</code> archive. It skips folders, but will iterate
 * over files inside of them.
 */
public class ZipArchiveEntryByteIterator implements AutoCloseableIterator<byte[]> {

    private final ZipFile zf;
    private final Enumeration<ZipArchiveEntry> iter;

    /**
     * Wrap a {@link Path} object. 
     * 
     * @throws IOException if there are issues with the underlying archive
     */
    public ZipArchiveEntryByteIterator(Path p) throws IOException {
        this.zf = new ZipFile(p.toFile());
        this.iter = this.zf.getEntries();
    }

    @Override
    public boolean hasNext() {
        return this.iter.hasMoreElements();
    }

    @Override
    public byte[] next() {
        try {
            ZipArchiveEntry entry = this.iter.nextElement();
            try (InputStream in = this.zf.getInputStream(entry);) {
                byte[] bytes = IOUtils.toByteArray(in);
                return bytes;
            }
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public void remove() {
        throw new UnsupportedOperationException("Cannot remove with this iterator.");
    }

    /* (non-Javadoc)
     * @see java.lang.AutoCloseable#close()
     */
    @Override
    public void close() throws IOException {
        this.zf.close();
    }
}