Android Open Source - JsonPullParser Json Util

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The source code is released under:
Apache License
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Java Source Code

/*
 * Copyright 2011 vvakame <vvakame@gmail.com>
 *// w  w w  .  ja v  a2  s . co  m
 * Licensed 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 net.vvakame.util.jsonpullparser.util;

import java.io.IOException;
import java.io.Writer;
import java.util.Date;
import java.util.List;

/**
 * {@link TokenConverter} supporting facility.<br>
 * Generated codes make use of it too.
 * @author vvakame
 */
public class JsonUtil {

  /**
   * Writes "{".
   * @param writer {@link Writer} to be used for writing value
   * @throws IOException
   * @author vvakame
   */
  public static void startHash(Writer writer) throws IOException {
    writer.write("{");
  }

  /**
   * Writes "}".
   * @param writer {@link Writer} to be used for writing value
   * @throws IOException
   * @author vvakame
   */
  public static void endHash(Writer writer) throws IOException {
    writer.write("}");
  }

  /**
   * Writes "[".
   * @param writer {@link Writer} to be used for writing value
   * @throws IOException
   * @author vvakame
   */
  public static void startArray(Writer writer) throws IOException {
    writer.write("[");
  }

  /**
   * Writes "]".
   * @param writer {@link Writer} to be used for writing value
   * @throws IOException
   * @author vvakame
   */
  public static void endArray(Writer writer) throws IOException {
    writer.write("]");
  }

  /**
   * Writes ",".
   * @param writer {@link Writer} to be used for writing value
   * @throws IOException
   * @author vvakame
   */
  public static void addSeparator(Writer writer) throws IOException {
    writer.write(",");
  }

  /**
   * Writes the given key as a JSON hash key, sanitizing with {@link #sanitize(String)} as a valid JSON-formatted data.
   * @param writer {@link Writer} to be used for writing value
   * @param key Key??????????
   * @throws IOException
   * @author vvakame
   */
  public static void putKey(Writer writer, String key) throws IOException {
    writer.write("\"");
    writer.write(sanitize(key));
    writer.write("\":");
  }

  /**
   * Writes the given object.<br>
   * Supported types are: {@link String} {@link Boolean} {@link Long} {@link Double} {@link JsonHash} {@link JsonArray}.<br>
   * An {@link IllegalStateException} will be thrown if the given object has an unsupported type.
   * @param writer
   * @param value
   * @throws IOException
   * @author vvakame
   */
  public static void put(Writer writer, Object value) throws IOException {
    if (value == null) {
      writer.write("null");
    } else if (value instanceof String) {
      put(writer, (String) value);
    } else if (value instanceof Boolean) {
      put(writer, (boolean) (Boolean) value);
    } else if (value instanceof Byte) {
      put(writer, (long) (Byte) value);
    } else if (value instanceof Short) {
      put(writer, (long) (Short) value);
    } else if (value instanceof Integer) {
      put(writer, (long) (Integer) value);
    } else if (value instanceof Long) {
      put(writer, (long) (Long) value);
    } else if (value instanceof Float) {
      put(writer, (double) (Float) value);
    } else if (value instanceof Double) {
      put(writer, (double) (Double) value);
    } else if (value instanceof Date) {
      put(writer, (Date) value);
    } else if (value instanceof JsonHash) {
      JsonHash jsonHash = (JsonHash) value;
      jsonHash.toJson(writer);
    } else if (value instanceof JsonArray) {
      JsonArray jsonArray = (JsonArray) value;
      jsonArray.toJson(writer);
    } else {
      throw new IllegalStateException("unknown class. class="
          + value.getClass().getCanonicalName());
    }
  }

  /**
   * Writes the given value with the given writer, sanitizing with {@link #sanitize(String)} as a valid JSON-formatted data.
   * @param writer
   * @param value
   * @throws IOException
   * @author vvakame
   */
  public static void put(Writer writer, String value) throws IOException {
    if (value == null) {
      writer.write("null");
    } else {
      writer.write("\"");
      writer.write(sanitize(value));
      writer.write("\"");
    }
  }

  /**
   * Writes the given value with the given writer, sanitizing with {@link #sanitize(String)} as a valid JSON-formatted data.
   * @param writer
   * @param values
   * @throws IOException
   * @author vvakame
   */
  public static void putStringList(Writer writer, List<String> values) throws IOException {
    if (values == null) {
      writer.write("null");
    } else {
      startArray(writer);
      for (int i = 0; i < values.size(); i++) {
        put(writer, values.get(i));
        if (i != values.size() - 1) {
          addSeparator(writer);
        }
      }
      endArray(writer);
    }
  }

  /**
   * Writes the given value with the given writer, sanitizing with {@link #sanitize(String)} as a valid JSON-formatted data.
   * @param writer
   * @param value
   * @throws IOException
   * @author vvakame
   */
  public static void put(Writer writer, char value) throws IOException {
    writer.write("\"");
    writer.write(sanitize(value));
    writer.write("\"");
  }

  /**
   * Writes the given value with the given writer, sanitizing with {@link #sanitize(String)} as a valid JSON-formatted data.
   * @param writer
   * @param value
   * @throws IOException
   * @author vvakame
   */
  public static void put(Writer writer, Character value) throws IOException {
    if (value == null) {
      writer.write("null");
    } else {
      writer.write("\"");
      writer.write(sanitize(value));
      writer.write("\"");
    }
  }

  /**
   * Writes the given value with the given writer, sanitizing with {@link #sanitize(String)} as a valid JSON-formatted data.
   * @param writer
   * @param values
   * @throws IOException
   * @author vvakame
   */
  public static void putCharacterList(Writer writer, List<Character> values) throws IOException {
    if (values == null) {
      writer.write("null");
    } else {
      startArray(writer);
      for (int i = 0; i < values.size(); i++) {
        put(writer, values.get(i));
        if (i != values.size() - 1) {
          addSeparator(writer);
        }
      }
      endArray(writer);
    }
  }

  /**
   * Writes the given value with the given writer.
   * @param writer
   * @param value
   * @throws IOException
   * @author vvakame
   */
  public static void put(Writer writer, byte value) throws IOException {
    writer.write(String.valueOf(value));
  }

  /**
   * Writes the given value with the given writer.
   * @param writer
   * @param value
   * @throws IOException
   * @author vvakame
   */
  public static void put(Writer writer, Byte value) throws IOException {
    if (value == null) {
      writer.write("null");
    } else {
      writer.write(value.toString());
    }
  }

  /**
   * Writes the given value with the given writer.
   * @param writer
   * @param values
   * @throws IOException
   * @author vvakame
   */
  public static void putByteList(Writer writer, List<Byte> values) throws IOException {
    if (values == null) {
      writer.write("null");
    } else {
      startArray(writer);
      for (int i = 0; i < values.size(); i++) {
        put(writer, values.get(i));
        if (i != values.size() - 1) {
          addSeparator(writer);
        }
      }
      endArray(writer);
    }
  }

  /**
   * Writes the given value with the given writer.
   * @param writer
   * @param value
   * @throws IOException
   * @author vvakame
   */
  public static void put(Writer writer, short value) throws IOException {
    writer.write(String.valueOf(value));
  }

  /**
   * Writes the given value with the given writer.
   * @param writer
   * @param value
   * @throws IOException
   * @author vvakame
   */
  public static void put(Writer writer, Short value) throws IOException {
    if (value == null) {
      writer.write("null");
    } else {
      writer.write(value.toString());
    }
  }

  /**
   * Writes the given value with the given writer.
   * @param writer
   * @param values
   * @throws IOException
   * @author vvakame
   */
  public static void putShortList(Writer writer, List<Short> values) throws IOException {
    if (values == null) {
      writer.write("null");
    } else {
      startArray(writer);
      for (int i = 0; i < values.size(); i++) {
        put(writer, values.get(i));
        if (i != values.size() - 1) {
          addSeparator(writer);
        }
      }
      endArray(writer);
    }
  }

  /**
   * Writes the given value with the given writer.
   * @param writer
   * @param value
   * @throws IOException
   * @author vvakame
   */
  public static void put(Writer writer, int value) throws IOException {
    writer.write(String.valueOf(value));
  }

  /**
   * Writes the given value with the given writer.
   * @param writer
   * @param value
   * @throws IOException
   * @author vvakame
   */
  public static void put(Writer writer, Integer value) throws IOException {
    if (value == null) {
      writer.write("null");
    } else {
      writer.write(value.toString());
    }
  }

  /**
   * Writes the given value with the given writer.
   * @param writer
   * @param values
   * @throws IOException
   * @author vvakame
   */
  public static void putIntegerList(Writer writer, List<Integer> values) throws IOException {
    if (values == null) {
      writer.write("null");
    } else {
      startArray(writer);
      for (int i = 0; i < values.size(); i++) {
        put(writer, values.get(i));
        if (i != values.size() - 1) {
          addSeparator(writer);
        }
      }
      endArray(writer);
    }
  }

  /**
   * Writes the given value with the given writer.
   * @param writer
   * @param value
   * @throws IOException
   * @author vvakame
   */
  public static void put(Writer writer, long value) throws IOException {
    writer.write(String.valueOf(value));
  }

  /**
   * Writes the given value with the given writer.
   * @param writer
   * @param value
   * @throws IOException
   * @author vvakame
   */
  public static void put(Writer writer, Long value) throws IOException {
    if (value == null) {
      writer.write("null");
    } else {
      writer.write(value.toString());
    }
  }

  /**
   * Writes the given value with the given writer.
   * @param writer
   * @param values
   * @throws IOException
   * @author vvakame
   */
  public static void putLongList(Writer writer, List<Long> values) throws IOException {
    if (values == null) {
      writer.write("null");
    } else {
      startArray(writer);
      for (int i = 0; i < values.size(); i++) {
        put(writer, values.get(i));
        if (i != values.size() - 1) {
          addSeparator(writer);
        }
      }
      endArray(writer);
    }
  }

  /**
   * Writes the given value with the given writer.
   * @param writer
   * @param value
   * @throws IOException
   * @author vvakame
   */
  public static void put(Writer writer, float value) throws IOException {
    writer.write(String.valueOf(value));
  }

  /**
   * Writes the given value with the given writer.
   * @param writer
   * @param value
   * @throws IOException
   * @author vvakame
   */
  public static void put(Writer writer, Float value) throws IOException {
    if (value == null) {
      writer.write("null");
    } else {
      writer.write(value.toString());
    }
  }

  /**
   * Writes the given value with the given writer.
   * @param writer
   * @param values
   * @throws IOException
   * @author vvakame
   */
  public static void putFloatList(Writer writer, List<Float> values) throws IOException {
    if (values == null) {
      writer.write("null");
    } else {
      startArray(writer);
      for (int i = 0; i < values.size(); i++) {
        put(writer, values.get(i));
        if (i != values.size() - 1) {
          addSeparator(writer);
        }
      }
      endArray(writer);
    }
  }

  /**
   * Writes the given value with the given writer.
   * @param writer
   * @param value
   * @throws IOException
   * @author vvakame
   */
  public static void put(Writer writer, double value) throws IOException {
    writer.write(String.valueOf(value));
  }

  /**
   * Writes the given value with the given writer.
   * @param writer
   * @param value
   * @throws IOException
   * @author vvakame
   */
  public static void put(Writer writer, Double value) throws IOException {
    if (value == null) {
      writer.write("null");
    } else {
      writer.write(value.toString());
    }
  }

  /**
   * Writes the given value with the given writer.
   * @param writer
   * @param values
   * @throws IOException
   * @author vvakame
   */
  public static void putDoubleList(Writer writer, List<Double> values) throws IOException {
    if (values == null) {
      writer.write("null");
    } else {
      startArray(writer);
      for (int i = 0; i < values.size(); i++) {
        put(writer, values.get(i));
        if (i != values.size() - 1) {
          addSeparator(writer);
        }
      }
      endArray(writer);
    }
  }

  /**
   * Writes the given value with the given writer.
   * @param writer
   * @param value
   * @throws IOException
   * @author vvakame
   */
  public static void put(Writer writer, boolean value) throws IOException {
    writer.write(String.valueOf(value));
  }

  /**
   * Writes the given value with the given writer.
   * @param writer
   * @param value
   * @throws IOException
   * @author vvakame
   */
  public static void put(Writer writer, Boolean value) throws IOException {
    if (value == null) {
      writer.write("null");
    } else {
      writer.write(value.toString());
    }
  }

  /**
   * Writes the given value with the given writer.
   * @param writer
   * @param values
   * @throws IOException
   * @author vvakame
   */
  public static void putBooleanList(Writer writer, List<Boolean> values) throws IOException {
    if (values == null) {
      writer.write("null");
    } else {
      startArray(writer);
      for (int i = 0; i < values.size(); i++) {
        put(writer, values.get(i));
        if (i != values.size() - 1) {
          addSeparator(writer);
        }
      }
      endArray(writer);
    }
  }

  /**
   * Writes the given value with the given writer.
   * @param writer
   * @param value
   * @throws IOException
   * @author vvakame
   */
  public static void put(Writer writer, Date value) throws IOException {
    if (value == null) {
      writer.write("null");
    } else {
      writer.write(String.valueOf(value.getTime()));
    }
  }

  /**
   * Writes the given value with the given writer.
   * @param writer
   * @param value
   * @throws IOException
   * @author vvakame
   */
  public static void put(Writer writer, Enum<?> value) throws IOException {
    if (value == null) {
      writer.write("null");
    } else {
      writer.write("\"");
      writer.write(sanitize(value.name()));
      writer.write("\"");
    }
  }

  /**
   * Writes the given value with the given writer.
   * @param writer
   * @param values
   * @throws IOException
   * @author vvakame
   */
  public static void putEnumList(Writer writer, List<? extends Enum<?>> values)
      throws IOException {

    if (values == null) {
      writer.write("null");
    } else {
      startArray(writer);
      for (int i = 0; i < values.size(); i++) {
        put(writer, values.get(i));
        if (i != values.size() - 1) {
          addSeparator(writer);
        }
      }
      endArray(writer);
    }
  }

  /**
   * Writes the given value with the given writer.
   * @param writer
   * @param values
   * @throws IOException
   * @author vvakame
   */
  public static void putDateList(Writer writer, List<Date> values) throws IOException {
    if (values == null) {
      writer.write("null");
    } else {
      startArray(writer);
      for (int i = 0; i < values.size(); i++) {
        put(writer, values.get(i));
        if (i != values.size() - 1) {
          addSeparator(writer);
        }
      }
      endArray(writer);
    }
  }

  static String sanitize(char orig) {
    return sanitize(String.valueOf(orig));
  }

  static String sanitize(String orig) {
    if (orig == null) {
      return null;
    }
    // TODO Increase Process Speed
    return orig.replace("\\", "\\\\").replace("\"", "\\\"").replace("/", "\\/")
      .replace("\b", "\\b").replace("\f", "\\f").replace("\n", "\\n").replace("\r", "\\r")
      .replace("\t", "\\t");
  }
}
Java Source Code List
