package org.webslinger.template;

 import java.io.IOException;

 import java.io.Writer;

 import java.util.ArrayList;

 import java.util.Arrays;

 import java.util.List;

 import java.util.Map;

 import org.apache.bsf.BSFException;

 public interface TemplateMacro {

     String getName();

     boolean isBlock();

     boolean render(TemplateManager manager, Object parent, Writer writer, Args args, Map<String, Object> context, Body body) throws IOException, BSFException;

     TemplateMacro newInstance(TemplateManager manager, Object parent, Args args) throws IOException, BSFException;

     final class Args {

         public final Object[] pList;

         public final Map<String, Object> pMap;

         public Args(Object[] pList, Map<String, Object> pMap) {

             this.pList = pList;

             this.pMap = pMap;

             if (pList == null && pMap == null) throw new InternalError("pList and pMap both null");

         }

         public Object get(String name, int index) {

             return pList != null ? (index < pList.length ? pList[index] : null) : pMap.get(name);

         }

         public Object[] getIndexed(String name, int index) {

             ArrayList found = new ArrayList();

             if (pList != null) {

                 while (index < pList.length) found.add(pList[index++]);

             } else {

                 int count = 0;

                 String key = name;

                 while (pMap.containsKey(key)) {

                     found.add(pMap.get(key));

                     key = name + count;

                     count++;

                 }

             }

             return found.toArray();

         }

         public String toString() {

             return "Args(" + (pList != null ? Arrays.asList(pList).toString() : pMap.toString()) + ")";

         }

     }

     interface Body {

         boolean render(Writer writer, Map<String, Object> context) throws IOException;

         Object getSource();

     }

 }