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Android binary resources read/write library
/*
* Copyright (c) 2002 JSON.org (now "Public Domain")
* This is NOT property of REAndroid
* This package is renamed from org.json.* to avoid class conflict when used on anroid platforms
*/
package com.reandroid.json;
import java.io.IOException;
import java.util.Collection;
import java.util.Map;
public class JSONWriter {
protected final Appendable writer;
protected char mode;
private boolean comma;
private final JSONObject[] stack;
private int top;
private int indentFactor;
public JSONWriter(Appendable w) {
this.comma = false;
this.mode = 'i';
this.stack = new JSONObject[MAX_DEPTH];
this.top = 0;
this.writer = w;
this.indentFactor = DEFAULT_INDENT_FACTOR;
}
/**
* indentFactor == 0, only new line
* indentFactor < 0, off
* indentFactor > 0, length of tab (left spaces) is indentFactor + depth
* default = INDENT_FACTOR
* */
public void setIndentFactor(int indentFactor) {
this.indentFactor = indentFactor;
}
private JSONWriter append(String string) throws JSONException {
if (string == null) {
throw new JSONException("Null pointer");
}
if (this.mode == 'o' || this.mode == 'a') {
try {
if (this.comma && this.mode == 'a') {
this.writer.append(',');
writeIndent();
}
this.writer.append(string);
} catch (IOException e) {
throw new JSONException(e);
}
if (this.mode == 'o') {
this.mode = 'k';
}
this.comma = true;
return this;
}
throw new JSONException("Value out of sequence.");
}
public JSONWriter array() throws JSONException {
writeIndent();
if (this.mode == 'i' || this.mode == 'o' || this.mode == 'a') {
this.push(null);
this.append("[");
this.comma = false;
writeIndent();
return this;
}
throw new JSONException("Misplaced array.");
}
private JSONWriter end(char m, char c) throws JSONException {
if (this.mode != m) {
throw new JSONException(m == 'a'
? "Misplaced endArray."
: "Misplaced endObject.");
}
this.pop(m);
try {
writeIndent();
this.writer.append(c);
} catch (IOException e) {
throw new JSONException(e);
}
this.comma = true;
return this;
}
public JSONWriter endArray() throws JSONException {
return this.end('a', ']');
}
public JSONWriter endObject() throws JSONException {
return this.end('k', '}');
}
public JSONWriter key(String string) throws JSONException {
if (string == null) {
throw new JSONException("Null key.");
}
if (this.mode == 'k') {
try {
JSONObject topObject = this.stack[this.top - 1];
// don't use the built in putOnce method to maintain Android support
if(topObject.has(string)) {
throw new JSONException("Duplicate key \"" + string + "\"");
}
topObject.put(string, true);
if (this.comma) {
this.writer.append(',');
writeIndent();
}
this.writer.append(JSONObject.quote(string));
this.writer.append(':');
this.comma = false;
this.mode = 'o';
return this;
} catch (IOException e) {
throw new JSONException(e);
}
}
throw new JSONException("Misplaced key.");
}
public JSONWriter object() throws JSONException {
if (this.mode == 'i') {
this.mode = 'o';
}
if (this.mode == 'o' || this.mode == 'a') {
this.append("{");
this.push(new JSONObject());
this.comma = false;
writeIndent();
return this;
}
throw new JSONException("Misplaced object.");
}
private void pop(char c) throws JSONException {
if (this.top <= 0) {
throw new JSONException("Nesting error.");
}
char m = this.stack[this.top - 1] == null ? 'a' : 'k';
if (m != c) {
throw new JSONException("Nesting error.");
}
this.top -= 1;
this.mode = this.top == 0
? 'd'
: this.stack[this.top - 1] == null
? 'a'
: 'k';
}
private void push(JSONObject jo) throws JSONException {
if (this.top >= MAX_DEPTH) {
throw new JSONException("Nesting too deep.");
}
this.stack[this.top] = jo;
this.mode = jo == null ? 'a' : 'k';
this.top += 1;
}
public JSONWriter value(boolean b) throws JSONException {
return this.append(b ? "true" : "false");
}
public JSONWriter value(double d) throws JSONException {
return this.value(Double.valueOf(d));
}
public JSONWriter value(long l) throws JSONException {
return this.append(Long.toString(l));
}
public JSONWriter value(Object object) throws JSONException {
return this.append(valueToString(object));
}
private void writeIndent() throws JSONException {
if(this.indentFactor < 0 || this.mode == 'i'){
return;
}
try{
Appendable appendable = this.writer;
appendable.append('\n');
int level = this.top * this.indentFactor;
for(int i = 0; i < level ; i++){
appendable.append(' ');
}
}catch (IOException ex){
throw new JSONException(ex);
}
}
public static String valueToString(Object value) throws JSONException {
if (value == null || value.equals(null)) {
return "null";
}
if (value instanceof JSONString) {
String object;
try {
object = ((JSONString) value).toJSONString();
} catch (Exception e) {
throw new JSONException(e);
}
if (object != null) {
return object;
}
throw new JSONException("Bad value from toJSONString: " + object);
}
if (value instanceof Number) {
return JSONItem.numberToString((Number) value);
}
if (value instanceof Boolean || value instanceof JSONObject
|| value instanceof JSONArray) {
return value.toString();
}
if (value instanceof Map) {
Map map = (Map) value;
return new JSONObject(map).toString();
}
if (value instanceof Collection) {
Collection coll = (Collection) value;
return new JSONArray(coll).toString();
}
if (value.getClass().isArray()) {
return new JSONArray(value).toString();
}
if(value instanceof Enum){
return JSONObject.quote(((Enum)value).name());
}
return JSONObject.quote(value.toString());
}
private static final int MAX_DEPTH = 200;
private static final int DEFAULT_INDENT_FACTOR = 1;
}
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