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 *
 * Copyright (c) 2006-2012 Oracle and/or its affiliates. All rights reserved.
 *
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 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
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 * file and include the License file at packager/legal/LICENSE.txt.
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 */
package org.glassfish.contextpropagation.internal;

import java.util.EnumSet;

import org.glassfish.contextpropagation.PropagationMode;
import org.glassfish.contextpropagation.View;

/**
 * Entries hold work contexts in the ContextMap as well as related metadata:
 * propagation mode, whether this thread originated the work context, and 
 * whether all are allowed to read its work context.
 */
public class Entry {
  Object value;
  EnumSet propagationModes;
  transient Boolean isOriginator;
  transient Boolean allowAllToRead;
  ContextType contextType;

  /**
   * Dedicated constructor, set the work context, it propagation  mode and type.
   * @param context
   * @param propModes
   * @param contextType
   */
  public Entry(Object context, EnumSet propModes, ContextType contextType) {
    this.value = context;
    propagationModes = propModes;
    this.contextType = contextType;
  }

  public View getView() {
    throw new UnsupportedOperationException("This Entry does not have a View associated to it");
  }

  public static Entry createViewEntryInstance(Object context, 
      EnumSet propModes, final ViewImpl view) {
    return new Entry(context, propModes, ContextType.VIEW_CAPABLE) {
      @Override public View getView() { return view; }
    }; 
  }


  public String getClassName() {
    throw new UnsupportedOperationException("This Entry does not have a class name associated to it.");
  }
  
  public static Entry createOpaqueEntryInstance(Object context, 
      EnumSet propModes, final String className) {
    return new Entry(context, propModes, ContextType.OPAQUE) {
      @Override public String getClassName() { return className; }
    }; 
  }

  /**
   * Utility method to set additional metadata.
   * @param isOriginator
   * @param allowAllToRead
   * @return
   */
  public Entry init(Boolean isOriginator, Boolean allowAllToRead) {
    this.isOriginator = isOriginator;
    this.allowAllToRead = allowAllToRead;
    return this;
  } 

  private static final String LINE_SEP = System.getProperty("line.separator");
  @Override
  public String toString() {
    StringBuilder sb = new StringBuilder(super.toString());
    sb.append(" {").append(LINE_SEP);
    sb.append("   Value: " + value).append(LINE_SEP);
    sb.append("   Propagation Modes: " + propagationModes).append(LINE_SEP);
    sb.append("   ContextType: " + contextType.name()).append(LINE_SEP);
    sb.append(isOriginator ? "   originator" : "   remote origin").append(LINE_SEP);
    sb.append(allowAllToRead ? "   readable by all" : "   restricted read access").append(LINE_SEP);
    sb.append("}");
    return sb.toString();
  }

  public ContextType getContextType() {
    return contextType;
  }

  @SuppressWarnings("unchecked")
  public  U getValue() { 
    return (U) value;
  }

  public EnumSet getPropagationModes() { 
    return propagationModes;
  }

  void validate() {
    if (value == null) throw new IllegalStateException("Entry must contain a non-null value.");
    if (contextType == null) throw new IllegalStateException("Entry must have a ContextType.");
    if (propagationModes == null) throw new IllegalStateException("Entry must have a EnumSet ContextType fromNumberClass(Class clz) {
      String simpleName = clz.getSimpleName();
      switch (simpleName.length()) {
      case NumberConstants.BYTE_LONG_SHORT:
        switch (simpleName.charAt(0)) {
        case NumberConstants.BYTE: return BYTE;
        case NumberConstants.LONG: return LONG;
        }
      case NumberConstants.SHORT_FLOAT: 
        switch (simpleName.charAt(0)) {
        case NumberConstants.SHORT: return SHORT;
        case NumberConstants.FLOAT: return FLOAT;
        }
      case NumberConstants.DOUBLE: return DOUBLE;
      case NumberConstants.INTEGER: return INT;
      case NumberConstants.ATOMICLONG_BIGDECIMAL_BIGINTEGER:
        switch (simpleName.charAt(3)) {
        case NumberConstants.ATOMICLONG: return ATOMICLONG;
        case NumberConstants.BIGDECIMAL: return BIGDECIMAL;
        case NumberConstants.BIGINTEGER: return BIGINTEGER;
        }
      case NumberConstants.ATOMICINTEGER: return ATOMICINTEGER;
      }
      throw new AssertionError("Unexepected Number Type: " + clz.getName());
    }
  }

}