Android Open Source - JsonPullParser Jpp Generator

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License

The source code is released under:

Apache License

Java Source Code

package net.vvakame.util.jsonpullparser.googleapiclient;
// ww  w  .  ja  va2  s.co m
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.nio.charset.Charset;
import java.util.ArrayDeque;
import java.util.Deque;

import net.vvakame.util.jsonpullparser.JsonPullParser.State;
import net.vvakame.util.jsonpullparser.util.JsonUtil;

import com.google.api.client.json.JsonFactory;
import com.google.api.client.json.JsonGenerator;

/**
 * Implementation for {@link JsonGenerator} by JsonPullParser.
 * @author vvakame
 */
public class JppGenerator extends JsonGenerator {

  final JppFactory factory;

  final Writer writer;


  /**
   * the constructor.
   * @param factory
   * @param out
   * @param enc
   * @category constructor
   */
  public JppGenerator(JppFactory factory, OutputStream out, Charset enc) {
    this.factory = factory;
    this.writer = new OutputStreamWriter(out, enc);
  }

  /**
   * the constructor.
   * @param factory
   * @param writer
   * @category constructor
   */
  public JppGenerator(JppFactory factory, Writer writer) {
    this.factory = factory;
    this.writer = writer;
  }

  @Override
  public JsonFactory getFactory() {
    return factory;
  }


  // START_ARRAY or START_HASH
  Deque<State> stateList = new ArrayDeque<State>();

  Deque<Boolean> firstList = new ArrayDeque<Boolean>();


  /**
   * inc depth
   * @param state
   * @author vvakame
   */
  void push(State state) {
    stateList.addLast(state);
    firstList.addLast(true);
  }

  /**
   * dec depth
   * @author vvakame
   */
  void pop() {
    stateList.removeLast();
    firstList.removeLast();
  }

  void eat(boolean key) throws IOException {
    if (firstList.isEmpty()) {
      return;
    }
    boolean value = firstList.getLast();
    if (value) {
      firstList.removeLast();
      firstList.addLast(false);
    } else if (isInArray()) {
      JsonUtil.addSeparator(writer);
    } else if (isInObject() && key) {
      JsonUtil.addSeparator(writer);
    }
  }

  boolean isInArray() {
    return stateList.getLast() == State.START_ARRAY;
  }

  boolean isInObject() {
    return stateList.getLast() == State.START_HASH;
  }

  @Override
  public void writeStartArray() throws IOException {
    eat(false);
    JsonUtil.startArray(writer);
    push(State.START_ARRAY);
  }

  @Override
  public void writeEndArray() throws IOException {
    JsonUtil.endArray(writer);
    pop();
  }

  @Override
  public void writeStartObject() throws IOException {
    eat(false);
    JsonUtil.startHash(writer);
    push(State.START_HASH);
  }

  @Override
  public void writeEndObject() throws IOException {
    JsonUtil.endHash(writer);
    pop();
  }

  @Override
  public void writeFieldName(String name) throws IOException {
    eat(true);
    JsonUtil.putKey(writer, name);
  }

  @Override
  public void writeNull() throws IOException {
    eat(false);
    JsonUtil.put(writer, (Object) null);
  }

  @Override
  public void writeString(String value) throws IOException {
    eat(false);
    JsonUtil.put(writer, value);
  }

  @Override
  public void writeBoolean(boolean state) throws IOException {
    eat(false);
    JsonUtil.put(writer, state);
  }

  @Override
  public void writeNumber(int v) throws IOException {
    eat(false);
    JsonUtil.put(writer, v);
  }

  @Override
  public void writeNumber(long v) throws IOException {
    JsonUtil.put(writer, v);
  }

  @Override
  public void writeNumber(BigInteger v) throws IOException {
    eat(false);
    writer.write(v.toString());
  }

  @Override
  public void writeNumber(float v) throws IOException {
    eat(false);
    JsonUtil.put(writer, v);
  }

  @Override
  public void writeNumber(double v) throws IOException {
    eat(false);
    JsonUtil.put(writer, v);
  }

  @Override
  public void writeNumber(BigDecimal v) throws IOException {
    eat(false);
    writer.write(v.toString());
  }

  @Override
  public void writeNumber(String encodedValue) throws IOException {
    eat(false);
    writer.write(encodedValue);
  }

  @Override
  public void flush() throws IOException {
    writer.flush();
  }

  @Override
  public void close() throws IOException {
    writer.close();
  }
}

Java Source Code List

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