/
Serializer.java
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/
Serializer.java
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package com.kendoui.taglib.json;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.reflect.Array;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
public class Serializer {
private Map<String, Object> properties(Object object) {
Map<String, Object> options = new HashMap<String, Object>();
try {
for (PropertyDescriptor property : Introspector.getBeanInfo(object.getClass(), Object.class).getPropertyDescriptors()) {
Method getter = property.getReadMethod();
if (getter != null) {
options.put(property.getName(), getter.invoke(object));
}
}
} catch (IntrospectionException e) {
} catch (IllegalAccessException e) {
} catch (IllegalArgumentException e) {
} catch (InvocationTargetException e) {
}
return options;
}
private void quote(Writer out, String string) throws IOException {
char ch = 0;
out.append("\"");
for (int index = 0, length = string.length(); index < length; index++) {
char previous = ch;
ch = string.charAt(index);
switch (ch) {
case '\\':
case '"':
out.append("\\")
.append(ch);
break;
case '/':
if (previous == '<') {
out.append("\\");
}
out.append(ch);
break;
case '\b':
out.append("\\b");
break;
case '\n':
out.append("\\n");
break;
case '\r':
out.append("\\r");
break;
case '\f':
out.append("\\f");
break;
case '\t':
out.append("\\t");
break;
default:
if (ch < ' ' || (ch >= '\u0080' && ch < '\u00a0') || (ch >= '\u2000' && ch < '\u2100')) {
String hex = "000" + Integer.toHexString(ch);
out.append("\\u")
.append(hex.substring(hex.length() - 4));
} else {
out.append(ch);
}
break;
}
}
out.append("\"");
}
public void serialize(Writer out, Object value) throws IOException {
if (value == null) {
out.append("null");
} else if (value instanceof String) {
quote(out, (String)value);
} else if (value instanceof Number) {
out.append(value.toString());
} else if (value instanceof Boolean) {
out.append(value.toString());
} else if (value instanceof Date) {
serializeDate(out, (Date)value);
} else if (value instanceof Iterable<?>) {
serializeIterable(out, (Iterable<?>)value);
} else if (value instanceof Serializable) {
serializeMap(out, ((Serializable)value).properties());
} else if (value instanceof Map<?,?>) {
serializeMap(out, (Map<?,?>)value);
} else if (value instanceof Function) {
((Function)value).write(out);
} else if (value.getClass().isArray()) {
serializeArray(out, value);
} else if (value.getClass().isEnum()) {
quote(out, value.toString());
} else {
serializeMap(out, properties(value));
}
}
private void serializeDate(Writer out, Date value) throws IOException {
Calendar cal = Calendar.getInstance();
cal.setTime(value);
out.append("new Date(")
.append(Integer.toString(cal.get(Calendar.YEAR)))
.append(",")
.append(Integer.toString(cal.get(Calendar.MONTH)))
.append(",")
.append(Integer.toString(cal.get(Calendar.DATE)))
.append(",")
.append(Integer.toString(cal.get(Calendar.HOUR_OF_DAY)))
.append(",")
.append(Integer.toString(cal.get(Calendar.MINUTE)))
.append(",")
.append(Integer.toString(cal.get(Calendar.SECOND)))
.append(",")
.append(Integer.toString(cal.get(Calendar.MILLISECOND)))
.append(")");
}
private void serializeMap(Writer out, Map<?,?> map) throws IOException {
out.append("{");
Iterator<?> iterator = map.entrySet().iterator();
while (iterator.hasNext()) {
Entry<?,?> entry = (Entry<?,?>)iterator.next();
out.append("\"")
.append(entry.getKey().toString())
.append("\":");
serialize(out, entry.getValue());
if (iterator.hasNext()) {
out.append(",");
}
}
out.append("}");
}
private void serializeIterable(Writer out, Iterable<?> iteratable) throws IOException {
out.append("[");
Iterator<?> iterator = iteratable.iterator();
while (iterator.hasNext()) {
serialize(out, iterator.next());
if (iterator.hasNext()) {
out.append(",");
}
}
out.append("]");
}
private void serializeArray(Writer out, Object array) throws IOException {
out.append("[");
for (int index = 0, length = Array.getLength(array); index < length; index++) {
serialize(out, Array.get(array, index));
if (index < length - 1) {
out.append(",");
}
}
out.append("]");
}
public String json(Object object) throws IOException {
StringWriter out = new StringWriter();
serialize(out, object);
return out.toString();
}
}