com.google.devtools.build.android.desugar.io.ZipInputFileProvider.java Source code

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Here is the source code for com.google.devtools.build.android.desugar.io.ZipInputFileProvider.java

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// Copyright 2017 The Bazel Authors. All rights reserved.
//
// 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 com.google.devtools.build.android.desugar.io;

import com.google.common.base.Functions;
import com.google.common.collect.Iterators;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Path;
import java.util.Iterator;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

/** Input provider is a zip file. */
class ZipInputFileProvider implements InputFileProvider {

    private final Path root;

    private final ZipFile zipFile;

    public ZipInputFileProvider(Path root) throws IOException {
        this.root = root;
        this.zipFile = new ZipFile(root.toFile());
    }

    @Override
    public void close() throws IOException {
        zipFile.close();
    }

    @Override
    public String toString() {
        return root.getFileName().toString();
    }

    @Override
    public ZipEntry getZipEntry(String filename) {
        ZipEntry zipEntry = zipFile.getEntry(filename);
        zipEntry.setCompressedSize(-1);
        return zipEntry;
    }

    @Override
    public InputStream getInputStream(String filename) throws IOException {
        return zipFile.getInputStream(zipFile.getEntry(filename));
    }

    @Override
    public Iterator<String> iterator() {
        return Iterators.transform(Iterators.forEnumeration(zipFile.entries()), Functions.toStringFunction());
    }
}