org.beangle.serializer.json.PrettyJsonWriter.scala Maven / Gradle / Ivy

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/*
 * Beangle, Agile Development Scaffold and Toolkits.
 *
 * Copyright © 2005, The Beangle Software.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see .
 */
package org.beangle.serializer.json

import java.io.Writer

import org.beangle.serializer.text.marshal.MarshallerRegistry
import org.beangle.serializer.text.marshal.Type.{Collection, Object}

class PrettyJsonWriter(writer: Writer, registry: MarshallerRegistry, lineIndenter: Array[Char], newLine: Array[Char])
  extends AbstractJsonWriter(writer, registry) {

  def this(writer: Writer, registry: MarshallerRegistry) = {
    this(writer, registry, Array(' ', ' '), Array('\n'))
  }

  override def startNode(name: String, clazz: Class[_]): Unit = {
    val depth = pathStack.size
    val inArray = depth > 0 && registry.lookup(this.pathStack.peek().clazz).targetType == Collection
    pathStack.push(name, clazz)
    if (!pathStack.isFirstInLevel) {
      writer.write(',')
      writer.write(newLine)
    }
    indent(depth)
    if (!inArray && depth > 0) {
      writer.write("\"")
      writer.write(name)
      writer.write("\":")
    }
    registry.lookup(clazz).targetType match {
      case Collection =>
        writer.write('['); writer.write(newLine)
      case Object =>
        writer.write('{'); writer.write(newLine)
      case _ =>
    }
  }

  override def addAttribute(key: String, value: String): Unit = {
    indent(pathStack.size)
    writer.write(" \"@")
    writer.write(key)
    writer.write("\":")
    writeText(value.toCharArray, quoted = true)
  }

  override def endNode(): Unit = {
    val clazz = pathStack.pop().clazz
    val depth = pathStack.size

    registry.lookup(clazz).targetType match {
      case Collection =>
        indentNewLine(depth); writer.write(']')
      case Object =>
        indentNewLine(depth); writer.write('}')
      case _ =>
    }
    if (pathStack.size == 0) writer.flush()
  }

  private def indentNewLine(depth: Int): Unit = {
    writer.write(newLine)
    (0 until depth) foreach (_ => writer.write(lineIndenter))
  }

  private def indent(depth: Int): Unit = {
    (0 until depth) foreach (_ => writer.write(lineIndenter))
  }
}