All Downloads are FREE. Search and download functionalities are using the official Maven repository.

com.dahuatech.hutool.json.JSONArray Maven / Gradle / Ivy

Go to download

Dahua ICC Open API SDK for Java

There is a newer version: 1.0.13.7
Show newest version
package com.dahuatech.hutool.json;

import com.dahuatech.hutool.core.bean.BeanPath;
import com.dahuatech.hutool.core.collection.ArrayIter;
import com.dahuatech.hutool.core.collection.CollUtil;
import com.dahuatech.hutool.core.util.CharUtil;
import com.dahuatech.hutool.core.util.ObjectUtil;
import com.dahuatech.hutool.core.util.StrUtil;
import com.dahuatech.hutool.core.util.TypeUtil;
import com.dahuatech.hutool.json.serialize.GlobalSerializeMapping;
import com.dahuatech.hutool.json.serialize.JSONSerializer;

import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.util.*;

/**
 * JSON数组

 * JSON数组是表示中括号括住的数据表现形式

 * 对应的JSON字符串格格式例如:
 *
 * 
 * ["a", "b", "c", 12]
 * 

 *
 * @author looly
 */
public class JSONArray extends JSONGetter implements JSON, List, RandomAccess {
  /** 默认初始大小 */
  public static final int DEFAULT_CAPACITY = 10;
  private static final long serialVersionUID = 2664900568717612292L;
  /** 持有原始数据的List */
  private final List rawList;
  /** 配置项 */
  private JSONConfig config;

  // -------------------------------------------------------------------------------------------------------------------- Constructor start
  /**
   * 构造

   * 默认使用{@link ArrayList} 实现
   */
  public JSONArray() {
    this(DEFAULT_CAPACITY);
  }

  /**
   * 构造

   * 默认使用{@link ArrayList} 实现
   *
   * @param initialCapacity 初始大小
   * @since 3.2.2
   */
  public JSONArray(int initialCapacity) {
    this(initialCapacity, JSONConfig.create());
  }

  /**
   * 构造

   * 默认使用{@link ArrayList} 实现
   *
   * @param config JSON配置项
   * @since 4.6.5
   */
  public JSONArray(JSONConfig config) {
    this(DEFAULT_CAPACITY, config);
  }

  /**
   * 构造

   * 默认使用{@link ArrayList} 实现
   *
   * @param initialCapacity 初始大小
   * @param config JSON配置项
   * @since 4.1.19
   */
  public JSONArray(int initialCapacity, JSONConfig config) {
    this.rawList = new ArrayList<>(initialCapacity);
    this.config = config;
  }

  /**
   * 构造

   * 将参数数组中的元素转换为JSON对应的对象加入到JSONArray中
   *
   * @param list 初始化的JSON数组
   */
  public JSONArray(Iterable list) {
    this();
    for (Object o : list) {
      this.add(o);
    }
  }

  /**
   * 构造

   * 将参数数组中的元素转换为JSON对应的对象加入到JSONArray中
   *
   * @param list 初始化的JSON数组
   */
  public JSONArray(Collection list) {
    this(list.size());
    this.addAll(list);
  }

  /**
   * 使用 {@link JSONTokener} 做为参数构造
   *
   * @param x A {@link JSONTokener}
   * @throws JSONException If there is a syntax error.
   */
  public JSONArray(JSONTokener x) throws JSONException {
    this();
    init(x);
  }

  /**
   * 从String构造（JSONArray字符串）
   *
   * @param source JSON数组字符串
   * @throws JSONException If there is a syntax error.
   */
  public JSONArray(CharSequence source) throws JSONException {
    this();
    init(source);
  }

  /**
   * 从对象构造，忽略{@code null}的值

   * 支持以下类型的参数：
   *
   * 
   * 1. 数组
   * 2. {@link Iterable}对象
   * 3. JSON数组字符串
   * 

   *
   * @param object 数组或集合或JSON数组字符串
   * @throws JSONException 非数组或集合
   */
  public JSONArray(Object object) throws JSONException {
    this(object, true);
  }

  /**
   * 从对象构造

   * 支持以下类型的参数：
   *
   * 
   * 1. 数组
   * 2. {@link Iterable}对象
   * 3. JSON数组字符串
   * 

   *
   * @param object 数组或集合或JSON数组字符串
   * @param ignoreNullValue 是否忽略空值
   * @throws JSONException 非数组或集合
   */
  public JSONArray(Object object, boolean ignoreNullValue) throws JSONException {
    this(object, JSONConfig.create().setIgnoreNullValue(ignoreNullValue));
  }

  /**
   * 从对象构造

   * 支持以下类型的参数：
   *
   * 
   * 1. 数组
   * 2. {@link Iterable}对象
   * 3. JSON数组字符串
   * 

   *
   * @param object 数组或集合或JSON数组字符串
   * @param jsonConfig JSON选项
   * @throws JSONException 非数组或集合
   * @since 4.6.5
   */
  public JSONArray(Object object, JSONConfig jsonConfig) throws JSONException {
    this(DEFAULT_CAPACITY, jsonConfig);
    init(object);
  }
  // -------------------------------------------------------------------------------------------------------------------- Constructor start

  /**
   * 设置转为字符串时的日期格式，默认为时间戳（null值）
   *
   * @param format 格式，null表示使用时间戳
   * @return this
   * @since 4.1.19
   */
  public JSONArray setDateFormat(String format) {
    this.config.setDateFormat(format);
    return this;
  }

  /**
   * JSONArray转为以separator为分界符的字符串
   *
   * @param separator 分界符
   * @return a string.
   * @throws JSONException If the array contains an invalid number.
   */
  public String join(String separator) throws JSONException {
    int len = this.rawList.size();
    StringBuilder sb = new StringBuilder();

    for (int i = 0; i < len; i += 1) {
      if (i > 0) {
        sb.append(separator);
      }
      sb.append(InternalJSONUtil.valueToString(this.rawList.get(i)));
    }
    return sb.toString();
  }

  @Override
  public Object get(int index) {
    return this.rawList.get(index);
  }

  @Override
  public Object getObj(Integer index, Object defaultValue) {
    return (index < 0 || index >= this.size()) ? defaultValue : this.rawList.get(index);
  }

  @Override
  public Object getByPath(String expression) {
    return BeanPath.create(expression).get(this);
  }

  @Override
  public  T getByPath(String expression, Class resultType) {
    return JSONConverter.jsonConvert(resultType, getByPath(expression), true);
  }

  @Override
  public void putByPath(String expression, Object value) {
    BeanPath.create(expression).set(this, value);
  }

  /**
   * Append an object value. This increases the array's length by one. 

   * 加入元素，数组长度+1，等同于 {@link JSONArray#add(Object)}
   *
   * @param value 值，可以是： Boolean, Double, Integer, JSONArray, JSONObject, Long, or String, or the
   *     JSONNull.NULL。
   * @return this.
   */
  public JSONArray put(Object value) {
    this.add(value);
    return this;
  }

  /**
   * 加入或者替换JSONArray中指定Index的值，如果index大于JSONArray的长度，将在指定index设置值，之前的位置填充JSONNull.Null
   *
   * @param index 位置
   * @param value 值对象. 可以是以下类型: Boolean, Double, Integer, JSONArray, JSONObject, Long, String, or
   *     the JSONNull.NULL.
   * @return this.
   * @throws JSONException index < 0 或者非有限的数字
   */
  public JSONArray put(int index, Object value) throws JSONException {
    this.add(index, value);
    return this;
  }

  /**
   * 根据给定名列表，与其位置对应的值组成JSONObject
   *
   * @param names 名列表，位置与JSONArray中的值位置对应
   * @return A JSONObject，无名或值返回null
   * @throws JSONException 如果任何一个名为null
   */
  public JSONObject toJSONObject(JSONArray names) throws JSONException {
    if (names == null || names.size() == 0 || this.size() == 0) {
      return null;
    }
    JSONObject jo = new JSONObject();
    for (int i = 0; i < names.size(); i += 1) {
      jo.put(names.getStr(i), this.getObj(i));
    }
    return jo;
  }

  @Override
  public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + ((rawList == null) ? 0 : rawList.hashCode());
    return result;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj) {
      return true;
    }
    if (obj == null) {
      return false;
    }
    if (getClass() != obj.getClass()) {
      return false;
    }
    final JSONArray other = (JSONArray) obj;
    if (rawList == null) {
      return other.rawList == null;
    } else {
      return rawList.equals(other.rawList);
    }
  }

  @Override
  public Iterator iterator() {
    return rawList.iterator();
  }

  /**
   * 当此JSON列表的每个元素都是一个JSONObject时，可以调用此方法返回一个Iterable，便于使用foreach语法遍历
   *
   * @return Iterable
   * @since 4.0.12
   */
  public Iterable jsonIter() {
    return new JSONObjectIter(iterator());
  }

  @Override
  public int size() {
    return rawList.size();
  }

  @Override
  public boolean isEmpty() {
    return rawList.isEmpty();
  }

  @Override
  public boolean contains(Object o) {
    return rawList.contains(o);
  }

  @Override
  public Object[] toArray() {
    return rawList.toArray();
  }

  @Override
  @SuppressWarnings("unchecked")
  public  T[] toArray(T[] a) {
    return (T[]) JSONConverter.toArray(this, a.getClass().getComponentType());
  }

  @Override
  public boolean add(Object e) {
    return this.rawList.add(JSONUtil.wrap(e, this.config));
  }

  @Override
  public Object remove(int index) {
    return index >= 0 && index < this.size() ? this.rawList.remove(index) : null;
  }

  @Override
  public boolean remove(Object o) {
    return rawList.remove(o);
  }

  @Override
  public boolean containsAll(Collection c) {
    return rawList.containsAll(c);
  }

  @Override
  public boolean addAll(Collection c) {
    if (CollUtil.isEmpty(c)) {
      return false;
    }
    for (Object obj : c) {
      this.add(obj);
    }
    return true;
  }

  @Override
  public boolean addAll(int index, Collection c) {
    if (CollUtil.isEmpty(c)) {
      return false;
    }
    final ArrayList list = new ArrayList<>(c.size());
    for (Object object : c) {
      list.add(JSONUtil.wrap(object, this.config));
    }
    return rawList.addAll(index, list);
  }

  @Override
  public boolean removeAll(Collection c) {
    return this.rawList.removeAll(c);
  }

  @Override
  public boolean retainAll(Collection c) {
    return this.rawList.retainAll(c);
  }

  @Override
  public void clear() {
    this.rawList.clear();
  }

  @Override
  public Object set(int index, Object element) {
    return this.rawList.set(index, JSONUtil.wrap(element, this.config));
  }

  @Override
  public void add(int index, Object element) {
    if (index < 0) {
      throw new JSONException("JSONArray[{}] not found.", index);
    }
    if (index < this.size()) {
      InternalJSONUtil.testValidity(element);
      this.rawList.add(index, JSONUtil.wrap(element, this.config));
    } else {
      while (index != this.size()) {
        this.add(JSONNull.NULL);
      }
      this.put(element);
    }
  }

  @Override
  public int indexOf(Object o) {
    return this.rawList.indexOf(o);
  }

  @Override
  public int lastIndexOf(Object o) {
    return this.rawList.lastIndexOf(o);
  }

  @Override
  public ListIterator listIterator() {
    return this.rawList.listIterator();
  }

  @Override
  public ListIterator listIterator(int index) {
    return this.rawList.listIterator(index);
  }

  @Override
  public List subList(int fromIndex, int toIndex) {
    return this.rawList.subList(fromIndex, toIndex);
  }

  /**
   * 转为Bean数组
   *
   * @param arrayClass 数组元素类型
   * @return 实体类对象
   */
  public Object toArray(Class arrayClass) {
    return JSONConverter.toArray(this, arrayClass);
  }

  /**
   * 转为{@link ArrayList}
   *
   * @param  元素类型
   * @param elementType 元素类型
   * @return {@link ArrayList}
   * @since 3.0.8
   */
  public  List toList(Class elementType) {
    return JSONConverter.toList(this, elementType);
  }

  /**
   * 转为JSON字符串，无缩进
   *
   * @return JSONArray字符串
   */
  @Override
  public String toString() {
    try {
      return this.toJSONString(0);
    } catch (Exception e) {
      return null;
    }
  }

  /**
   * 格式化打印JSON，缩进为4个空格
   *
   * @return 格式化后的JSON字符串
   * @throws JSONException 包含非法数抛出此异常
   * @since 3.0.9
   */
  @Override
  public String toStringPretty() throws JSONException {
    return this.toJSONString(4);
  }

  /**
   * 转为JSON字符串，指定缩进值
   *
   * @param indentFactor 缩进值，即缩进空格数
   * @return JSON字符串
   * @throws JSONException JSON写入异常
   */
  @Override
  public String toJSONString(int indentFactor) throws JSONException {
    StringWriter sw = new StringWriter();
    synchronized (sw.getBuffer()) {
      return this.write(sw, indentFactor, 0).toString();
    }
  }

  @Override
  public Writer write(Writer writer) throws JSONException {
    return this.write(writer, 0, 0);
  }

  @Override
  public Writer write(Writer writer, int indentFactor, int indent) throws JSONException {
    try {
      return doWrite(writer, indentFactor, indent);
    } catch (IOException e) {
      throw new JSONException(e);
    }
  }

  // ------------------------------------------------------------------------------------------------- Private method start

  /**
   * 将JSON内容写入Writer
   *
   * @param writer writer
   * @param indentFactor 缩进因子，定义每一级别增加的缩进量
   * @param indent 本级别缩进量
   * @return Writer
   * @throws IOException IO相关异常
   */
  private Writer doWrite(Writer writer, int indentFactor, int indent) throws IOException {
    writer.write(CharUtil.BRACKET_START);
    final int newindent = indent + indentFactor;
    final boolean isIgnoreNullValue = this.config.isIgnoreNullValue();
    boolean isFirst = true;
    for (Object obj : this.rawList) {
      if (ObjectUtil.isNull(obj) && isIgnoreNullValue) {
        continue;
      }
      if (isFirst) {
        isFirst = false;
      } else {
        writer.write(CharUtil.COMMA);
      }

      if (indentFactor > 0) {
        writer.write(CharUtil.LF);
      }
      InternalJSONUtil.indent(writer, newindent);
      InternalJSONUtil.writeValue(writer, obj, indentFactor, newindent, this.config);
    }

    if (indentFactor > 0) {
      writer.write(CharUtil.LF);
    }
    InternalJSONUtil.indent(writer, indent);
    writer.write(CharUtil.BRACKET_END);
    return writer;
  }

  /**
   * 初始化
   *
   * @param source 数组或集合或JSON数组字符串
   * @throws JSONException 非数组或集合
   */
  @SuppressWarnings({"rawtypes", "unchecked"})
  private void init(Object source) throws JSONException {
    if (null == source) {
      return;
    }

    final JSONSerializer serializer = GlobalSerializeMapping.getSerializer(source.getClass());
    if (null != serializer
        && JSONArray.class.equals(TypeUtil.getTypeArgument(serializer.getClass()))) {
      // 自定义序列化
      serializer.serialize(this, source);
    } else if (source instanceof CharSequence) {
      // JSON字符串
      init((CharSequence) source);
    } else {
      Iterator iter;
      if (source.getClass().isArray()) { // 数组
        iter = new ArrayIter<>(source);
      } else if (source instanceof Iterator) { // Iterator
        iter = ((Iterator) source);
      } else if (source instanceof Iterable) { // Iterable
        iter = ((Iterable) source).iterator();
      } else {
        throw new JSONException(
            "JSONArray initial value should be a string or collection or array.");
      }
      while (iter.hasNext()) {
        this.add(iter.next());
      }
    }
  }

  /**
   * 初始化
   *
   * @param source JSON字符串
   */
  private void init(CharSequence source) {
    if (null != source) {
      init(new JSONTokener(StrUtil.trim(source)));
    }
  }

  /**
   * 初始化
   *
   * @param x {@link JSONTokener}
   */
  private void init(JSONTokener x) {
    if (x.nextClean() != '[') {
      throw x.syntaxError("A JSONArray text must start with '['");
    }
    if (x.nextClean() != ']') {
      x.back();
      for (; ; ) {
        if (x.nextClean() == ',') {
          x.back();
          this.rawList.add(JSONNull.NULL);
        } else {
          x.back();
          this.rawList.add(x.nextValue());
        }
        switch (x.nextClean()) {
          case ',':
            if (x.nextClean() == ']') {
              return;
            }
            x.back();
            break;
          case ']':
            return;
          default:
            throw x.syntaxError("Expected a ',' or ']'");
        }
      }
    }
  }
  // ------------------------------------------------------------------------------------------------- Private method end
}
 















© 2015 - 2024 Weber Informatics LLC | Privacy Policy