JarFile.java

package com.telerik.metadata.bcl;

import com.telerik.metadata.ClassMapProvider;
import com.telerik.metadata.desc.ClassDescriptor;

import java.io.FileInputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.jar.JarInputStream;
import java.util.zip.ZipEntry;

import org.apache.bcel.classfile.ClassFormatException;
import org.apache.bcel.classfile.ClassParser;

public class JarFile implements ClassMapProvider {
    private final String path;
    private final Map<String, ClassDescriptor> classMap;
    private static final String CLASS_EXT = ".class";

    private JarFile(String path) {
        this.path = path;
        this.classMap = new HashMap<String, ClassDescriptor>();
    }

    public String getPath() {
        return path;
    }

    public Map<String, ClassDescriptor> getClassMap() {
        return classMap;
    }

    public static JarFile readJar(String path) throws ClassFormatException,
        IOException {
        JarFile jar;
        JarInputStream jis = null;
        try {
            jis = new JarInputStream(new FileInputStream(path));

            jar = new JarFile(path);

            for (ZipEntry ze = jis.getNextEntry(); ze != null; ze = jis
                    .getNextEntry()) {
                String name = ze.getName();
                if (name.endsWith(CLASS_EXT)) {
                    name = name
                           .substring(0, name.length() - CLASS_EXT.length())
                           .replace('/', '.');
                    ClassParser cp = new ClassParser(jis, name);
                    ClassDescriptor clazz = new ClassInfo(cp.parse());
                    jar.classMap.put(name, clazz);
                }
            }
        } finally {
            if (jis != null) {
                jis.close();
            }
        }
        return jar;
    }
}