package com.sprint.jvm.loader;
import com.sprint.jvm.clz.ClassFile;
import java.io.IOException;
import java.io.File;
import java.io.FileInputStream;
import java.util.List;
import java.util.ArrayList;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.StringUtils;
public class ClassFileLoader {
private List<String> clzPaths = new ArrayList<String>();
public byte[] readBinaryCode(String className) {
className = className.replace('.', File.separatorChar) + ".class";
for (String path : this.clzPaths) {
String clzFileName = path + File.separatorChar + className;
byte[] codes = loadClassFile(clzFileName);
if (codes != null) {
return codes;
}
}
return null;
}
private byte[] loadClassFile(String clzFileName) {
File f = new File(clzFileName);
try {
return IOUtils.toByteArray(new FileInputStream(f));
} catch(IOException e) {
e.printStackTrace();
return null;
}
}
public void addClassPath(String path) {
if (this.clzPaths.contains(path)) {
return;
}
this.clzPaths.add(path);
}
public String getClassPath() {
return StringUtils.join(this.clzPaths, ";");
}
public ClassFile loadClass(String className) {
byte[] codes = this.readBinaryCode(className);
ClassFileParser parser = new ClassFileParser();
return parser.parse(codes);
}
}