JSONUtil.java

package net.minidev.json;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import net.minidev.asm.FieldFilter;
import net.minidev.json.annotate.JsonIgnore;

/*
 *    Copyright 2011-2024 JSON-SMART authors
 *
 * 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.
 */
public class JSONUtil {
  @SuppressWarnings({"unchecked", "rawtypes"})
  public static Object convertToStrict(Object obj, Class<?> dest) {
    if (obj == null) return null;
    if (dest.isAssignableFrom(obj.getClass())) return obj;
    if (dest.isPrimitive()) {
      if (dest == int.class)
        if (obj instanceof Number) return ((Number) obj).intValue();
        else return Integer.valueOf(obj.toString());
      else if (dest == short.class)
        if (obj instanceof Number) return ((Number) obj).shortValue();
        else return Short.valueOf(obj.toString());
      else if (dest == long.class)
        if (obj instanceof Number) return ((Number) obj).longValue();
        else return Long.valueOf(obj.toString());
      else if (dest == byte.class)
        if (obj instanceof Number) return ((Number) obj).byteValue();
        else return Byte.valueOf(obj.toString());
      else if (dest == float.class)
        if (obj instanceof Number) return ((Number) obj).floatValue();
        else return Float.valueOf(obj.toString());
      else if (dest == double.class)
        if (obj instanceof Number) return ((Number) obj).doubleValue();
        else return Double.valueOf(obj.toString());
      else if (dest == char.class) {
        String asString = obj.toString();
        if (asString.length() > 0) return Character.valueOf(asString.charAt(0));
      } else if (dest == boolean.class) {
        if (obj instanceof Number) return ((Number) obj).intValue() != 0;
        if (obj instanceof String) return Boolean.valueOf((String) obj);
      }
      throw new RuntimeException(
          "Primitive: Can not convert " + obj.getClass().getName() + " to " + dest.getName());
    } else {
      if (dest.isEnum()) return Enum.valueOf((Class<Enum>) dest, obj.toString());
      if (dest == Integer.class)
        if (obj instanceof Number) return Integer.valueOf(((Number) obj).intValue());
        else return Integer.valueOf(obj.toString());
      if (dest == Long.class)
        if (obj instanceof Number) return Long.valueOf(((Number) obj).longValue());
        else return Long.valueOf(obj.toString());
      if (dest == Short.class)
        if (obj instanceof Number) return Short.valueOf(((Number) obj).shortValue());
        else return Short.valueOf(obj.toString());
      if (dest == Byte.class)
        if (obj instanceof Number) return Byte.valueOf(((Number) obj).byteValue());
        else return Byte.valueOf(obj.toString());
      if (dest == Float.class)
        if (obj instanceof Number) return Float.valueOf(((Number) obj).floatValue());
        else return Float.valueOf(obj.toString());
      if (dest == Double.class)
        if (obj instanceof Number) return Double.valueOf(((Number) obj).doubleValue());
        else return Double.valueOf(obj.toString());
      if (dest == Character.class) {
        String asString = obj.toString();
        if (asString.length() > 0) return Character.valueOf(asString.charAt(0));
      }
      if (dest == Boolean.class) {
        if (obj instanceof Number) return ((Number) obj).intValue() != 0;
        if (obj instanceof String) return Boolean.valueOf((String) obj);
      }
      throw new RuntimeException(
          "Object: Can not Convert " + obj.getClass().getName() + " to " + dest.getName());
    }
  }

  @SuppressWarnings({"unchecked", "rawtypes"})
  public static Object convertToX(Object obj, Class<?> dest) {
    if (obj == null) return null;
    if (dest.isAssignableFrom(obj.getClass())) return obj;
    if (dest.isPrimitive()) {
      if (obj instanceof Number) return obj;
      if (dest == int.class) return Integer.valueOf(obj.toString());
      else if (dest == short.class) return Short.valueOf(obj.toString());
      else if (dest == long.class) return Long.valueOf(obj.toString());
      else if (dest == byte.class) return Byte.valueOf(obj.toString());
      else if (dest == float.class) return Float.valueOf(obj.toString());
      else if (dest == double.class) return Double.valueOf(obj.toString());
      else if (dest == char.class) {
        String asString = obj.toString();
        if (asString.length() > 0) return Character.valueOf(asString.charAt(0));
      } else if (dest == boolean.class) {
        if (obj instanceof Number) return ((Number) obj).intValue() != 0;
        if (obj instanceof String) return Boolean.valueOf((String) obj);
      }
      throw new RuntimeException(
          "Primitive: Can not convert " + obj.getClass().getName() + " to " + dest.getName());
    } else {
      if (dest.isEnum()) return Enum.valueOf((Class<Enum>) dest, obj.toString());
      if (dest == Integer.class)
        if (obj instanceof Number) return Integer.valueOf(((Number) obj).intValue());
        else return Integer.valueOf(obj.toString());
      if (dest == Long.class)
        if (obj instanceof Number) return Long.valueOf(((Number) obj).longValue());
        else return Long.valueOf(obj.toString());
      if (dest == Short.class)
        if (obj instanceof Number) return Short.valueOf(((Number) obj).shortValue());
        else return Short.valueOf(obj.toString());
      if (dest == Byte.class)
        if (obj instanceof Number) return Byte.valueOf(((Number) obj).byteValue());
        else return Byte.valueOf(obj.toString());
      if (dest == Float.class)
        if (obj instanceof Number) return Float.valueOf(((Number) obj).floatValue());
        else return Float.valueOf(obj.toString());
      if (dest == Double.class)
        if (obj instanceof Number) return Double.valueOf(((Number) obj).doubleValue());
        else return Double.valueOf(obj.toString());
      if (dest == Character.class) {
        String asString = obj.toString();
        if (asString.length() > 0) return Character.valueOf(asString.charAt(0));
      }
      if (dest == Boolean.class) {
        if (obj instanceof Number) return ((Number) obj).intValue() != 0;
        if (obj instanceof String) return Boolean.valueOf((String) obj);
      }
      throw new RuntimeException(
          "Object: Can not Convert " + obj.getClass().getName() + " to " + dest.getName());
    }
  }

  public static final JsonSmartFieldFilter JSON_SMART_FIELD_FILTER = new JsonSmartFieldFilter();

  public static class JsonSmartFieldFilter implements FieldFilter {

    public boolean canUse(Field field) {
      JsonIgnore ignore = field.getAnnotation(JsonIgnore.class);
      if (ignore != null && ignore.value()) return false;
      return true;
    }

    public boolean canUse(Field field, Method method) {
      JsonIgnore ignore = method.getAnnotation(JsonIgnore.class);
      if (ignore != null && ignore.value()) return false;
      return true;
    }

    public boolean canRead(Field field) {
      return true;
    }

    public boolean canWrite(Field field) {
      return true;
    }
  }

  public static String getSetterName(String key) {
    int len = key.length();
    char[] b = new char[len + 3];
    b[0] = 's';
    b[1] = 'e';
    b[2] = 't';
    char c = key.charAt(0);
    if (c >= 'a' && c <= 'z') c += 'A' - 'a';
    b[3] = c;
    for (int i = 1; i < len; i++) {
      b[i + 3] = key.charAt(i);
    }
    return new String(b);
  }

  public static String getGetterName(String key) {
    int len = key.length();
    char[] b = new char[len + 3];
    b[0] = 'g';
    b[1] = 'e';
    b[2] = 't';
    char c = key.charAt(0);
    if (c >= 'a' && c <= 'z') c += 'A' - 'a';
    b[3] = c;
    for (int i = 1; i < len; i++) {
      b[i + 3] = key.charAt(i);
    }
    return new String(b);
  }

  public static String getIsName(String key) {
    int len = key.length();
    char[] b = new char[len + 2];
    b[0] = 'i';
    b[1] = 's';
    char c = key.charAt(0);
    if (c >= 'a' && c <= 'z') c += 'A' - 'a';
    b[2] = c;
    for (int i = 1; i < len; i++) {
      b[i + 2] = key.charAt(i);
    }
    return new String(b);
  }
}