| /* |
| * 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 org.apache.johnzon.core.io.BoundedOutputStreamWriter; |
| |
| import jakarta.json.stream.JsonGenerator; |
| import jakarta.json.stream.JsonGeneratorFactory; |
| import java.io.Flushable; |
| import java.io.OutputStream; |
| import java.io.OutputStreamWriter; |
| import java.io.Writer; |
| import java.nio.charset.Charset; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.Map; |
| |
| import static java.nio.charset.StandardCharsets.UTF_8; |
| import static java.util.Arrays.asList; |
| import static java.util.Optional.ofNullable; |
| |
| public class JsonGeneratorFactoryImpl extends AbstractJsonFactory implements JsonGeneratorFactory { |
| public static final String GENERATOR_BUFFER_LENGTH = "org.apache.johnzon.default-char-buffer-generator"; |
| public static final String BOUNDED_OUTPUT_STREAM_WRITER_LEN = "org.apache.johnzon.boundedoutputstreamwriter"; |
| 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, ENCODING, BOUNDED_OUTPUT_STREAM_WRITER_LEN |
| ); |
| |
| private final Charset defaultEncoding; |
| |
| //key caching currently disabled |
| private final boolean pretty; |
| private final int boundedOutputStreamWriter; |
| private final Buffer buffer; |
| private volatile Buffer customBuffer; |
| |
| public JsonGeneratorFactoryImpl(final Map<String, ?> config) { |
| super(config, SUPPORTED_CONFIG_KEYS, null); |
| this.pretty = getBool(JsonGenerator.PRETTY_PRINTING, false); |
| this.boundedOutputStreamWriter = getInt(BOUNDED_OUTPUT_STREAM_WRITER_LEN, -1); |
| this.defaultEncoding = ofNullable(config) |
| .map(c -> c.get(ENCODING)) |
| .map(it -> Charset.class.isInstance(it) ? Charset.class.cast(it) : Charset.forName(it.toString())) |
| .orElse(UTF_8); |
| |
| 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.buffer = new Buffer(getBufferProvider().newCharProvider(bufferSize), bufferSize); |
| } |
| |
| @Override |
| public JsonGenerator createGenerator(final Writer writer) { |
| return new JsonGeneratorImpl(writer, getBufferProvider(writer), pretty); |
| } |
| |
| @Override |
| public JsonGenerator createGenerator(final OutputStream out) { |
| return new JsonGeneratorImpl( |
| boundedOutputStreamWriter <= 0 ? |
| new OutputStreamWriter(out, defaultEncoding) : |
| new BoundedOutputStreamWriter(out, defaultEncoding, boundedOutputStreamWriter), |
| getBufferProvider(out), pretty); |
| } |
| |
| @Override |
| public JsonGenerator createGenerator(final OutputStream out, final Charset charset) { |
| final Charset cs = charset == null ? defaultEncoding : charset; |
| return new JsonGeneratorImpl( |
| boundedOutputStreamWriter <= 0 ? |
| new OutputStreamWriter(out, cs) : |
| new BoundedOutputStreamWriter(out, cs, boundedOutputStreamWriter), |
| getBufferProvider(out), pretty); |
| } |
| |
| @Override |
| public Map<String, ?> getConfigInUse() { |
| return Collections.unmodifiableMap(internalConfig); |
| } |
| |
| public Charset getDefaultEncoding() { |
| return defaultEncoding; |
| } |
| |
| private BufferStrategy.BufferProvider<char[]> getBufferProvider(final Flushable flushable) { |
| if (!(flushable instanceof Buffered)) { |
| return buffer.provider; |
| } |
| |
| final int bufferSize = Buffered.class.cast(flushable).bufferSize(); |
| |
| if (customBuffer != null && customBuffer.size == bufferSize) { |
| return customBuffer.provider; |
| } |
| |
| synchronized (this) { |
| customBuffer = new Buffer(getBufferProvider().newCharProvider(bufferSize), bufferSize); |
| return customBuffer.provider; |
| } |
| } |
| |
| private static final class Buffer { |
| private final BufferStrategy.BufferProvider<char[]> provider; |
| private final int size; |
| |
| private Buffer(final BufferStrategy.BufferProvider<char[]> |
| bufferProvider, final int bufferSize) { |
| this.provider = bufferProvider; |
| this.size = bufferSize; |
| } |
| } |
| } |