/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2013, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.classic.joran.action;

import javax.naming.Context;
import javax.naming.NamingException;

import org.xml.sax.Attributes;

import ch.qos.logback.classic.util.JNDIUtil;
import ch.qos.logback.core.joran.action.Action;
import ch.qos.logback.core.joran.action.ActionUtil;
import ch.qos.logback.core.joran.action.ActionUtil.Scope;
import ch.qos.logback.core.joran.spi.InterpretationContext;
import ch.qos.logback.core.util.OptionHelper;

/**
 * Insert an env-entry found in JNDI as a new context variable  

 * @author Ceki Gulcu
 *
 */
public class InsertFromJNDIAction extends Action {

  public static final String ENV_ENTRY_NAME_ATTR="env-entry-name";
  public static final String AS_ATTR="as";
  
  public void begin(InterpretationContext ec, String name, Attributes attributes) {

    int errorCount = 0;
    String envEntryName = ec.subst(attributes.getValue(ENV_ENTRY_NAME_ATTR));
    String asKey = ec.subst(attributes.getValue(AS_ATTR));

    String scopeStr = attributes.getValue(SCOPE_ATTRIBUTE);
    Scope scope = ActionUtil.stringToScope(scopeStr);

    String envEntryValue;
    
    if(OptionHelper.isEmpty(envEntryName)) {
      String lineColStr = getLineColStr(ec);
      addError("["+ENV_ENTRY_NAME_ATTR+"] missing, around "+lineColStr);
      errorCount++;
    }
    
    if(OptionHelper.isEmpty(asKey)) {
      String lineColStr = getLineColStr(ec);
      addError("["+AS_ATTR+"] missing, around "+lineColStr);
      errorCount++;
    }
    
    if(errorCount != 0) {
      return;
    }
    
    try {
      Context ctx = JNDIUtil.getInitialContext();
      envEntryValue = JNDIUtil.lookup(ctx, envEntryName);
      if(OptionHelper.isEmpty(envEntryValue)) {
        addError("["+envEntryName+"] has null or empty value");
      } else {
        addInfo("Setting variable ["+asKey+"] to ["+envEntryValue+"] in ["+scope+"] scope");
        ActionUtil.setProperty(ec, asKey, envEntryValue, scope);
      }
    } catch (NamingException e) {
      addError("Failed to lookup JNDI env-entry ["+envEntryName+"]");
    }
    
    
  }

  public void end(InterpretationContext ec, String name) {
  }
}
