de.is24.deadcode4j.analyzer.ByteCodeAnalyzer Maven / Gradle / Ivy

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package de.is24.deadcode4j.analyzer;

import de.is24.deadcode4j.Analyzer;
import de.is24.deadcode4j.CodeContext;
import javassist.ClassPool;
import javassist.CtClass;
import org.apache.commons.io.IOUtils;

import javax.annotation.Nonnull;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

/**
 * Serves as a base class with which to analyze byte code (classes).
 *
 * @since 1.3.0
 */
public abstract class ByteCodeAnalyzer implements Analyzer {

    @Override
    public final void doAnalysis(@Nonnull CodeContext codeContext, @Nonnull File file) {
        if (file.getName().endsWith(".class")) {
            analyzeClass(codeContext, file);
        }
    }

    /**
     * Perform an analysis for the specified class.
     * Results must be reported via the capabilities of the {@link CodeContext}.
     *
     * @since 1.3.0
     */
    protected abstract void analyzeClass(@Nonnull CodeContext codeContext, @Nonnull CtClass clazz);

    private void analyzeClass(@Nonnull CodeContext codeContext, @Nonnull File clazz) {
        final CtClass ctClass;
        FileInputStream in = null;
        try {
            in = new FileInputStream(clazz);
            ctClass = new ClassPool(false).makeClass(in);
        } catch (IOException e) {
            throw new RuntimeException("Could not analyze [" + clazz + "]!", e);
        } finally {
            IOUtils.closeQuietly(in);
        }
        analyzeClass(codeContext, ctClass);
    }

}