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net.vvakame.util.jsonpullparser.util.JsonSliceUtil Maven / Gradle / Ivy
package net.vvakame.util.jsonpullparser.util;
import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.util.List;
import net.vvakame.util.jsonpullparser.JsonFormatException;
import net.vvakame.util.jsonpullparser.JsonPullParser.State;
import net.vvakame.util.jsonpullparser.JsonSlice;
/**
* An utility class for {@link JsonSlice}
* @author vvakame
*/
public class JsonSliceUtil {
/**
* Encodes the given list of {@link JsonSlice}s to valid JSON.
*
* @param slices List of {@link JsonSlice}s to encode
* @return Valid JSON-formatted string
* @throws JsonFormatException
* @throws IOException
* @author vvakame
*/
public static String slicesToString(List slices) throws JsonFormatException,
IOException {
if (slices == null || slices.size() == 0) {
throw new JsonFormatException("slices is null or empty.");
}
StringWriter writer = new StringWriter();
int cnt = slices.size();
for (int i = 0; i < cnt; i++) {
JsonSlice slice = slices.get(i);
if (slice == null) {
throw new JsonFormatException("slice is null. i=" + i);
}
switch (slice.getState()) {
case START_ARRAY:
i = slicesToStringInArray(slices, i, writer);
break;
case START_HASH:
i = slicesToStringInHash(slices, i, writer);
break;
default:
throw new JsonFormatException("invalid state. i=" + i + " is "
+ slice.getState());
}
}
return writer.toString();
}
static int slicesToStringInArray(List slices, int index, Writer writer)
throws JsonFormatException, IOException {
if (slices.get(index).getState() != State.START_ARRAY) {
throw new JsonFormatException("invalid state. i=" + index + " is "
+ slices.get(index).getState());
}
JsonUtil.startArray(writer);
index++;
int cnt = slices.size();
for (int i = index; i < cnt; i++) {
JsonSlice slice = slices.get(i);
if (slice == null) {
throw new JsonFormatException("slice is null. i=" + i);
}
switch (slice.getState()) {
case START_ARRAY:
i = slicesToStringInArray(slices, i, writer);
if (!isNextIsEndArray(slices, i)) {
JsonUtil.addSeparator(writer);
}
break;
case START_HASH:
i = slicesToStringInHash(slices, i, writer);
if (!isNextIsEndArray(slices, i)) {
JsonUtil.addSeparator(writer);
}
break;
case END_ARRAY:
JsonUtil.endArray(writer);
return i;
case VALUE_BOOLEAN:
JsonUtil.put(writer, slice.getValueBoolean());
if (!isNextIsEndArray(slices, i)) {
JsonUtil.addSeparator(writer);
}
break;
case VALUE_LONG:
JsonUtil.put(writer, slice.getValueLong());
if (!isNextIsEndArray(slices, i)) {
JsonUtil.addSeparator(writer);
}
break;
case VALUE_DOUBLE:
JsonUtil.put(writer, slice.getValueDouble());
if (!isNextIsEndArray(slices, i)) {
JsonUtil.addSeparator(writer);
}
break;
case VALUE_STRING:
JsonUtil.put(writer, slice.getValueStr());
if (!isNextIsEndArray(slices, i)) {
JsonUtil.addSeparator(writer);
}
break;
case VALUE_NULL:
JsonUtil.put(writer, (Object) null);
if (!isNextIsEndArray(slices, i)) {
JsonUtil.addSeparator(writer);
}
break;
default:
throw new JsonFormatException("invalid state. i=" + i + " is "
+ slice.getState());
}
}
throw new JsonFormatException("invalid state.");
}
static boolean isNextIsEndArray(List slices, int index) {
if (slices.size() <= index + 1) {
return false;
} else {
return slices.get(index + 1).getState() == State.END_ARRAY;
}
}
static int slicesToStringInHash(List slices, int index, Writer writer)
throws JsonFormatException, IOException {
if (slices.get(index).getState() != State.START_HASH) {
throw new JsonFormatException("invalid state. i=" + index + " is "
+ slices.get(index).getState());
}
JsonUtil.startHash(writer);
index++;
int cnt = slices.size();
boolean isExpectKey = true;
for (int i = index; i < cnt; i++) {
JsonSlice slice = slices.get(i);
if (slice == null) {
throw new JsonFormatException("slice is null. i=" + i);
}
State state = slice.getState();
switch (state) {
case START_ARRAY:
isExpectKey = checkExpectKey(isExpectKey, state);
i = slicesToStringInArray(slices, i, writer);
if (!isNextIsEndHash(slices, i)) {
JsonUtil.addSeparator(writer);
}
break;
case START_HASH:
isExpectKey = checkExpectKey(isExpectKey, state);
i = slicesToStringInHash(slices, i, writer);
if (!isNextIsEndHash(slices, i)) {
JsonUtil.addSeparator(writer);
}
break;
case END_HASH:
JsonUtil.endHash(writer);
return i;
case KEY:
isExpectKey = checkExpectKey(isExpectKey, state);
JsonUtil.putKey(writer, slice.getValueStr());
break;
case VALUE_BOOLEAN:
isExpectKey = checkExpectKey(isExpectKey, state);
JsonUtil.put(writer, slice.getValueBoolean());
if (!isNextIsEndHash(slices, i)) {
JsonUtil.addSeparator(writer);
}
break;
case VALUE_LONG:
isExpectKey = checkExpectKey(isExpectKey, state);
JsonUtil.put(writer, slice.getValueLong());
if (!isNextIsEndHash(slices, i)) {
JsonUtil.addSeparator(writer);
}
break;
case VALUE_DOUBLE:
isExpectKey = checkExpectKey(isExpectKey, state);
JsonUtil.put(writer, slice.getValueDouble());
if (!isNextIsEndHash(slices, i)) {
JsonUtil.addSeparator(writer);
}
break;
case VALUE_STRING:
isExpectKey = checkExpectKey(isExpectKey, state);
JsonUtil.put(writer, slice.getValueStr());
if (!isNextIsEndHash(slices, i)) {
JsonUtil.addSeparator(writer);
}
break;
case VALUE_NULL:
isExpectKey = checkExpectKey(isExpectKey, state);
JsonUtil.put(writer, (Object) null);
if (!isNextIsEndHash(slices, i)) {
JsonUtil.addSeparator(writer);
}
break;
default:
throw new JsonFormatException("invalid state. i=" + i + " is "
+ slice.getState());
}
}
throw new JsonFormatException("invalid state.");
}
static boolean checkExpectKey(boolean isExpectKey, State state) throws JsonFormatException {
if (isExpectKey && state != State.KEY) {
throw new JsonFormatException("expected State is KEY, but get=" + state);
} else if (!isExpectKey && state == State.KEY) {
throw new JsonFormatException("expected State is not KEY.");
}
return !isExpectKey;
}
static boolean isNextIsEndHash(List slices, int index) {
if (slices.size() <= index + 1) {
return false;
} else {
return slices.get(index + 1).getState() == State.END_HASH;
}
}
}
