91 lines
3 KiB
Java
91 lines
3 KiB
Java
package org.dynmap.web;
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import java.lang.reflect.Array;
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import java.lang.reflect.Field;
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import java.lang.reflect.Modifier;
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import java.security.KeyStore.Entry;
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import java.util.LinkedHashMap;
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import java.util.List;
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import java.util.Map;
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public class Json {
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public static String stringifyJson(Object o) {
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StringBuilder sb = new StringBuilder();
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appendJson(o, sb);
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return sb.toString();
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}
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public static void appendJson(Object o, StringBuilder s) {
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if (o == null) {
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s.append("null");
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} else if (o instanceof Boolean) {
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s.append(((Boolean) o) ? "true" : "false");
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} else if (o instanceof String) {
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s.append("\"" + ((String)o).replace("\"", "\\\"") + "\"");
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} else if (o instanceof Integer || o instanceof Long || o instanceof Float || o instanceof Double) {
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s.append(o.toString());
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} else if (o instanceof LinkedHashMap<?, ?>) {
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LinkedHashMap<?, ?> m = (LinkedHashMap<?, ?>) o;
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s.append("{");
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boolean first = true;
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for (Map.Entry<?, ?> entry : m.entrySet()) {
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if (first)
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first = false;
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else
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s.append(",");
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appendJson(entry.getKey(), s);
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s.append(": ");
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appendJson(entry.getValue(), s);
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}
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s.append("}");
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} else if (o instanceof List<?>) {
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List<?> l = (List<?>) o;
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s.append("[");
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int count = 0;
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for (int i = 0; i < l.size(); i++) {
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if (count++ > 0) s.append(",");
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appendJson(l.get(i), s);
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}
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s.append("]");
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} else if (o.getClass().isArray()) {
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int length = Array.getLength(o);
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s.append("[");
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int count = 0;
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for (int i = 0; i < length; i++) {
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if (count++ > 0) s.append(",");
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appendJson(Array.get(o, i), s);
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}
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s.append("]");
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} else if (o instanceof Object) /* TODO: Always true, maybe interface? */ {
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s.append("{");
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boolean first = true;
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Class<?> c = o.getClass();
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for(Field field : c.getFields()) {
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if (!Modifier.isPublic(field.getModifiers()))
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continue;
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String fieldName = field.getName();
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Object fieldValue;
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try {
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fieldValue = field.get(o);
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} catch (IllegalArgumentException e) {
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continue;
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} catch (IllegalAccessException e) {
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continue;
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}
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if (first)
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first = false;
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else
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s.append(",");
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appendJson(fieldName, s);
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s.append(": ");
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appendJson(fieldValue, s);
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}
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s.append("}");
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} else {
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s.append("undefined");
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}
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}
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}
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