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Modern Java & JVM language decompiler aiming to be as accurate as possible, with an emphasis on output quality.

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package org.jetbrains.java.decompiler.util;

import java.io.File;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.zip.ZipFile;

public final class ZipFileCache implements AutoCloseable {
  private final Map files = new ConcurrentHashMap<>();

  public ZipFile get(final String path) throws IOException {
    try {
      return this.files.computeIfAbsent(path, pth -> {
        try {
          return new ZipFile(new File(pth));
        } catch (IOException ex) {
          throw new UncheckedIOException(ex);
        }
      });
    } catch (UncheckedIOException ex) {
      throw ex.getCause();
    }
  }

  @Override
  public void close() throws IOException {
    IOException failure = null;

    for (Map.Entry entry : this.files.entrySet()) {
      try {
        entry.getValue().close();
      } catch (IOException ex) {
        if (failure == null) {
          failure = ex;
        } else {
          failure.addSuppressed(ex);
        }
      }
    }

    this.files.clear();
  }
}