/*

  * 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 static java.util.Arrays.asList;

 import java.io.OutputStream;

 import java.io.Writer;

 import java.nio.charset.Charset;

 import java.util.Collection;

 import java.util.Collections;

 import java.util.Map;

 import java.util.concurrent.ConcurrentMap;

 import javax.json.stream.JsonGenerator;

 import javax.json.stream.JsonGeneratorFactory;

 public class JsonGeneratorFactoryImpl extends AbstractJsonFactory implements JsonGeneratorFactory {    

     public static final String GENERATOR_BUFFER_LENGTH = "org.apache.johnzon.default-char-buffer-generator";

     public static final int DEFAULT_GENERATOR_BUFFER_LENGTH =  Integer.getInteger(GENERATOR_BUFFER_LENGTH, 64 * 1024); //64k

     static final Collection<String> SUPPORTED_CONFIG_KEYS = asList(

         JsonGenerator.PRETTY_PRINTING, GENERATOR_BUFFER_LENGTH, BUFFER_STRATEGY

     );

     //key caching currently disabled

     private final ConcurrentMap<String, String> cache = null;//new ConcurrentHashMap<String, String>();

     private final boolean pretty;

     private final BufferStrategy.BufferProvider<char[]> bufferProvider;

     public JsonGeneratorFactoryImpl(final Map<String, ?> config) {

           super(config, SUPPORTED_CONFIG_KEYS, null); 

           this.pretty = getBool(JsonGenerator.PRETTY_PRINTING, false);

           final int bufferSize = getInt(GENERATOR_BUFFER_LENGTH, DEFAULT_GENERATOR_BUFFER_LENGTH);

           if (bufferSize <= 0) {

               throw new IllegalArgumentException("buffer length must be greater than zero");

           }

           this.bufferProvider = getBufferProvider().newCharProvider(bufferSize);

     }

     @Override

     public JsonGenerator createGenerator(final Writer writer) {

         if (pretty) {

             return new JsonPrettyGeneratorImpl(writer, bufferProvider, cache);

         }

         return new JsonGeneratorImpl(writer, bufferProvider, cache);

     }

     @Override

     public JsonGenerator createGenerator(final OutputStream out) {

         if (pretty) {

             return new JsonPrettyGeneratorImpl(out, bufferProvider, cache);

         }

         return new JsonGeneratorImpl(out, bufferProvider, cache);

     }

     @Override

     public JsonGenerator createGenerator(final OutputStream out, final Charset charset) {

         if (pretty) {

             return new JsonPrettyGeneratorImpl(out,charset, bufferProvider, cache);

         }

         return new JsonGeneratorImpl(out,charset, bufferProvider, cache);

     }

     @Override

     public Map<String, ?> getConfigInUse() {

         return Collections.unmodifiableMap(internalConfig);

     }

 }