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The Checker Framework enhances Java’s type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs. The Checker Framework includes compiler plug-ins ("checkers") that find bugs or verify their absence. It also permits you to write your own compiler plug-ins.

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package org.checkerframework.framework.stub;

import java.io.IOException;
import java.io.InputStream;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

/**
 * {@link JarEntry}-based implementation of {@link StubResource}.
 */
public class JarEntryStubResource implements StubResource {
    private final JarFile file;
    private final JarEntry entry;

    /**
     * Constructs a {@code StubResource} for the specified entry in the
     * specified JAR file.
     *
     * @param file the JAR file
     * @param entry the JAR entry
     */
    public JarEntryStubResource(JarFile file, JarEntry entry) {
        this.file = file;
        this.entry = entry;
    }

    @Override
    public String getDescription() {
        return file.getName() + "!" + entry.getName();
    }

    @Override
    public InputStream getInputStream() throws IOException {
        return file.getInputStream(entry);
    }
}