/*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements. See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership. The ASF licenses this file

  * to you under the Apache License, Version 2.0 (the

  * "License"); you may not use this file except in compliance

  * with the License. You may obtain a copy of the License at

  *

  * http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing,

  * software distributed under the License is distributed on an

  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

  * KIND, either express or implied. See the License for the

  * specific language governing permissions and limitations

  * under the License.

  */

 package org.apache.johnzon.core;

 import java.io.Serializable;

 import java.util.AbstractMap;

 import java.util.Iterator;

 import java.util.Map;

 import java.util.Set;

 import javax.json.JsonArray;

 import javax.json.JsonNumber;

 import javax.json.JsonObject;

 import javax.json.JsonString;

 import javax.json.JsonValue;

 final class JsonObjectImpl extends AbstractMap<String, JsonValue> implements JsonObject, Serializable {

     private Integer hashCode = null;

     private final Map<String, JsonValue> unmodifieableBackingMap;

     private <T> T value(final String name, final Class<T> clazz) {

         final Object v = unmodifieableBackingMap.get(name);

         if (v != null) {

             return clazz.cast(v);

         }

         throw new NullPointerException("no mapping for " + name);

     }

     JsonObjectImpl(final Map<String, JsonValue> backingMap) {

         super();

         this.unmodifieableBackingMap = backingMap;

     }

     @Override

     public JsonArray getJsonArray(final String name) {

         return value(name, JsonArray.class);

     }

     @Override

     public JsonObject getJsonObject(final String name) {

         return value(name, JsonObject.class);

     }

     @Override

     public JsonNumber getJsonNumber(final String name) {

         return value(name, JsonNumber.class);

     }

     @Override

     public JsonString getJsonString(final String name) {

         return value(name, JsonString.class);

     }

     @Override

     public String getString(final String name) {

         return getJsonString(name).getString();

     }

     @Override

     public String getString(final String name, final String defaultValue) {

         final Object v = unmodifieableBackingMap.get(name);

         if (v != null) {

             if (v instanceof JsonString) {

                 return JsonString.class.cast(v).getString();

             } else {

                 return defaultValue;

             }

         } else {

             return defaultValue;

         }

     }

     @Override

     public int getInt(final String name) {

         return getJsonNumber(name).intValue();

     }

     @Override

     public int getInt(final String name, final int defaultValue) {

         final Object v = unmodifieableBackingMap.get(name);

         if (v != null) {

             if (v instanceof JsonNumber) {

                 return JsonNumber.class.cast(v).intValue();

             } else {

                 return defaultValue;

             }

         } else {

             return defaultValue;

         }

     }

     @Override

     public boolean getBoolean(final String name) {

         return value(name, JsonValue.class) == JsonValue.TRUE;

     }

     @Override

     public boolean getBoolean(final String name, final boolean defaultValue) {

         final Object v = unmodifieableBackingMap.get(name);

         if (v != null) {

             if (v == JsonValue.TRUE) {

                 return true;

             } else if (v == JsonValue.FALSE) {

                 return false;

             } else {

                 return defaultValue;

             }

         } else {

             return defaultValue;

         }

     }

     @Override

     public boolean isNull(final String name) {

         return value(name, JsonValue.class) == JsonValue.NULL;

     }

     @Override

     public ValueType getValueType() {

         return ValueType.OBJECT;

     }

     @Override

     public String toString() {

         final StringBuilder builder = new StringBuilder("{");

         final Iterator<Map.Entry<String, JsonValue>> it = unmodifieableBackingMap.entrySet().iterator();

         boolean hasNext = it.hasNext();

         while (hasNext) {

             final Map.Entry<String, JsonValue> entry = it.next();

             builder.append('"').append(entry.getKey()).append("\":");

             final JsonValue value = entry.getValue();

             if (JsonString.class.isInstance(value)) {

                 builder.append(value.toString());

             } else {

                 builder.append(value != JsonValue.NULL ? value.toString() : JsonChars.NULL);

             }

             hasNext = it.hasNext();

             if (hasNext) {

                 builder.append(",");

             }

         }

         return builder.append('}').toString();

     }

     @Override

     public boolean equals(final Object obj) {

         return JsonObjectImpl.class.isInstance(obj)

                 && unmodifieableBackingMap.equals(JsonObjectImpl.class.cast(obj).unmodifieableBackingMap);

     }

     @Override

     public int hashCode() {

         Integer h = hashCode;

         if (h == null) {

             h = unmodifieableBackingMap.hashCode();

             hashCode = h;

         }

         return h;

     }

     @Override

     public Set<java.util.Map.Entry<String, JsonValue>> entrySet() {

         return unmodifieableBackingMap.entrySet();

     }

 }