org.commonjava.maven.galley.filearc.internal.ZipDownload.java Source code

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Here is the source code for org.commonjava.maven.galley.filearc.internal.ZipDownload.java

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/**
 * Copyright (C) 2013 Red Hat, Inc. (jdcasey@commonjava.org)
 *
 * Licensed 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.commonjava.maven.galley.filearc.internal;

import static org.apache.commons.io.IOUtils.closeQuietly;
import static org.apache.commons.io.IOUtils.copy;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.jar.JarFile;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

import org.commonjava.maven.galley.TransferException;
import org.commonjava.maven.galley.event.EventMetadata;
import org.commonjava.maven.galley.model.Transfer;
import org.commonjava.maven.galley.model.TransferOperation;
import org.commonjava.maven.galley.spi.transport.DownloadJob;

public class ZipDownload extends AbstractZipOperation implements DownloadJob {

    private TransferException error;

    private final EventMetadata eventMetadata;

    public ZipDownload(final Transfer txfr, final EventMetadata eventMetadata) {
        super(txfr);
        this.eventMetadata = eventMetadata;
    }

    @Override
    public long getTransferSize() {
        return -1;
    }

    @Override
    public TransferException getError() {
        return error;
    }

    @Override
    public DownloadJob call() {
        final File src = getZipFile();

        if (src.isDirectory()) {
            return this;
        }

        ZipFile zf = null;
        InputStream in = null;
        OutputStream out = null;
        try {
            zf = isJarOperation() ? new JarFile(src) : new ZipFile(src);

            final ZipEntry entry = zf.getEntry(getFullPath());
            if (entry != null) {
                if (entry.isDirectory()) {
                    error = new TransferException("Cannot read stream. Source is a directory: %s!%s",
                            getLocation().getUri(), getFullPath());
                } else {
                    in = zf.getInputStream(entry);
                    out = getTransfer().openOutputStream(TransferOperation.DOWNLOAD, true, eventMetadata);

                    copy(in, out);

                    return this;
                }
            } else {
                error = new TransferException("Cannot find entry: %s in: %s", getFullPath(),
                        getLocation().getUri());
            }
        } catch (final IOException e) {
            error = new TransferException("Failed to copy from: %s to: %s. Reason: %s", e, src, getTransfer(),
                    e.getMessage());
        } finally {
            closeQuietly(in);
            if (zf != null) {
                //noinspection EmptyCatchBlock
                try {
                    zf.close();
                } catch (final IOException e) {
                }
            }

            closeQuietly(out);
        }

        if (error != null) {
            logger.error("Failed to download: {}. Reason: {}", this, error);
        }

        return null;
    }

    @Override
    public Transfer getTransfer() {
        return super.getTransfer();
    }
}