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Dynamic scripting for the JVM

There is a newer version: 1.4.6

package org.snapscript.compile;

import static org.snapscript.core.Reserved.DEFAULT_PACKAGE;
import static org.snapscript.tree.Instruction.SCRIPT;

import org.snapscript.common.Cache;
import org.snapscript.common.LeastRecentlyUsedCache;
import org.snapscript.compile.assemble.Program;
import org.snapscript.core.Context;
import org.snapscript.core.FilePathConverter;
import org.snapscript.core.Path;
import org.snapscript.core.PathConverter;
import org.snapscript.core.link.Package;
import org.snapscript.core.link.PackageLinker;

public class StringCompiler implements Compiler {
   
   private final Cache cache;
   private final PathConverter converter;
   private final Context context;   
   private final String module;
   
   public StringCompiler(Context context) {
      this(context, DEFAULT_PACKAGE);
   }
   
   public StringCompiler(Context context, String module) {
      this.cache = new LeastRecentlyUsedCache();
      this.converter = new FilePathConverter();
      this.context = context;
      this.module = module;
   } 
   
   @Override
   public Executable compile(String source) throws Exception {
      if(source == null) {
         throw new NullPointerException("No source provided");
      }
      Executable executable = cache.fetch(source);
      
      if(executable == null) {
         Path path = converter.createPath(module);
         PackageLinker linker = context.getLinker();
         Package library = linker.link(path, source, SCRIPT.name);
         
         return new Program(context, library, path, module);
      }
      return executable;
   } 
}