/*

  * 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.InputStream;

 import java.io.Reader;

 import java.nio.charset.Charset;

 import java.util.Collection;

 import java.util.Collections;

 import java.util.Map;

 import javax.json.JsonArray;

 import javax.json.JsonObject;

 import javax.json.stream.JsonParser;

 import javax.json.stream.JsonParserFactory;

 class JsonParserFactoryImpl extends AbstractJsonFactory implements JsonParserFactory {

     public static final String MAX_STRING_LENGTH = "org.apache.johnzon.max-string-length";

     public static final int DEFAULT_MAX_STRING_LENGTH = Integer.getInteger(MAX_STRING_LENGTH, 10 * 1024 * 1024); //10m

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

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

     public static final String SUPPORTS_COMMENTS = "org.apache.johnzon.supports-comments";

     public static final boolean DEFAULT_SUPPORTS_COMMENT = Boolean.getBoolean(SUPPORTS_COMMENTS); //default is false;

     static final Collection<String> SUPPORTED_CONFIG_KEYS = asList(

         BUFFER_STRATEGY, MAX_STRING_LENGTH, BUFFER_LENGTH, SUPPORTS_COMMENTS

     );

     private final int maxSize;

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

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

     private final boolean supportsComments;

     JsonParserFactoryImpl(final Map<String, ?> config) {

         super(config, SUPPORTED_CONFIG_KEYS, null);

         final int bufferSize = getInt(BUFFER_LENGTH, DEFAULT_BUFFER_LENGTH);

         if (bufferSize <= 0) {

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

         }

         this.maxSize = getInt(MAX_STRING_LENGTH, DEFAULT_MAX_STRING_LENGTH);

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

         this.valueBufferProvider = getBufferProvider().newCharProvider(maxSize);

         this.supportsComments = getBool(SUPPORTS_COMMENTS, DEFAULT_SUPPORTS_COMMENT);

     }

     private JsonParser getDefaultJsonParserImpl(final InputStream in) {

         if (supportsComments) {

             return new CommentsJsonStreamParserImpl(in, maxSize, bufferProvider, valueBufferProvider);

         }

         //UTF Auto detection RFC 4627

         return new JsonStreamParserImpl(in, maxSize, bufferProvider, valueBufferProvider);

     }

     private JsonParser getDefaultJsonParserImpl(final InputStream in, final Charset charset) {

         if (supportsComments) {

             return new CommentsJsonStreamParserImpl(in, charset, maxSize, bufferProvider, valueBufferProvider);

         }

         //use provided charset

         return new JsonStreamParserImpl(in, charset, maxSize, bufferProvider, valueBufferProvider);

     }

     private JsonParser getDefaultJsonParserImpl(final Reader in) {

         if (supportsComments) {

             return new CommentsJsonStreamParserImpl(in, maxSize, bufferProvider, valueBufferProvider);

         }

         //no charset necessary

         return new JsonStreamParserImpl(in, maxSize, bufferProvider, valueBufferProvider);

     }

     @Override

     public JsonParser createParser(final Reader reader) {

         return getDefaultJsonParserImpl(reader);

     }

     @Override

     public JsonParser createParser(final InputStream in) {

         return getDefaultJsonParserImpl(in);

     }

     @Override

     public JsonParser createParser(final InputStream in, final Charset charset) {

         return getDefaultJsonParserImpl(in, charset);

     }

     @Override

     public JsonParser createParser(final JsonObject obj) {

         // no need of a comment version since JsonObject has no comment event

         return new JsonInMemoryParser(obj);

     }

     @Override

     public JsonParser createParser(final JsonArray array) {

         // no need of a comment version since JsonObject has no comment event

         return new JsonInMemoryParser(array);

     }

     @Override

     public Map<String, ?> getConfigInUse() {

         return Collections.unmodifiableMap(internalConfig);

     }

     public JsonParser createInternalParser(final InputStream in) {

         return getDefaultJsonParserImpl(in);

     }

     public JsonParser createInternalParser(final InputStream in, final Charset charset) {

         return getDefaultJsonParserImpl(in, charset);

     }

     public JsonParser createInternalParser(final Reader reader) {

         return getDefaultJsonParserImpl(reader);

     }

 }