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JsonValue.java
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package org.simdjson;
import java.util.Arrays;
import java.util.Iterator;
import java.util.Map;
import java.util.NoSuchElementException;
import static org.simdjson.Tape.DOUBLE;
import static org.simdjson.Tape.FALSE_VALUE;
import static org.simdjson.Tape.INT64;
import static org.simdjson.Tape.NULL_VALUE;
import static org.simdjson.Tape.START_ARRAY;
import static org.simdjson.Tape.START_OBJECT;
import static org.simdjson.Tape.STRING;
import static org.simdjson.Tape.TRUE_VALUE;
import static java.nio.charset.StandardCharsets.UTF_8;
public class JsonValue {
private final Tape tape;
private final byte[] buffer;
private final int tapeIdx;
private final byte[] stringBuffer;
JsonValue(Tape tape, int tapeIdx, byte[] stringBuffer, byte[] buffer) {
this.tape = tape;
this.tapeIdx = tapeIdx;
this.stringBuffer = stringBuffer;
this.buffer = buffer;
}
public boolean isArray() {
return tape.getType(tapeIdx) == START_ARRAY;
}
public boolean isObject() {
return tape.getType(tapeIdx) == START_OBJECT;
}
public boolean isLong() {
return tape.getType(tapeIdx) == INT64;
}
public boolean isDouble() {
return tape.getType(tapeIdx) == DOUBLE;
}
public boolean isBoolean() {
char type = tape.getType(tapeIdx);
return type == TRUE_VALUE || type == FALSE_VALUE;
}
public boolean isNull() {
return tape.getType(tapeIdx) == NULL_VALUE;
}
public boolean isString() {
return tape.getType(tapeIdx) == STRING;
}
public Iterator<JsonValue> arrayIterator() {
return new ArrayIterator(tapeIdx);
}
public Iterator<Map.Entry<String, JsonValue>> objectIterator() {
return new ObjectIterator(tapeIdx);
}
public long asLong() {
return tape.getInt64Value(tapeIdx);
}
public double asDouble() {
return tape.getDouble(tapeIdx);
}
public boolean asBoolean() {
return tape.getType(tapeIdx) == TRUE_VALUE;
}
public String asString() {
return getString(tapeIdx);
}
private String getString(int tapeIdx) {
int stringBufferIdx = (int) tape.getValue(tapeIdx);
int len = IntegerUtils.toInt(stringBuffer, stringBufferIdx);
return new String(stringBuffer, stringBufferIdx + Integer.BYTES, len, UTF_8);
}
public JsonValue get(String name) {
byte[] bytes = name.getBytes(UTF_8);
int idx = tapeIdx + 1;
int endIdx = tape.getMatchingBraceIndex(tapeIdx) - 1;
while (idx < endIdx) {
int stringBufferIdx = (int) tape.getValue(idx);
int len = IntegerUtils.toInt(stringBuffer, stringBufferIdx);
int valIdx = tape.computeNextIndex(idx);
idx = tape.computeNextIndex(valIdx);
int stringBufferFromIdx = stringBufferIdx + Integer.BYTES;
int stringBufferToIdx = stringBufferFromIdx + len;
if (Arrays.compare(bytes, 0, bytes.length, stringBuffer, stringBufferFromIdx, stringBufferToIdx) == 0) {
return new JsonValue(tape, valIdx, stringBuffer, buffer);
}
}
return null;
}
public int getSize() {
return tape.getScopeCount(tapeIdx);
}
@Override
public String toString() {
switch (tape.getType(tapeIdx)) {
case INT64 -> {
return String.valueOf(asLong());
}
case DOUBLE -> {
return String.valueOf(asDouble());
}
case TRUE_VALUE, FALSE_VALUE -> {
return String.valueOf(asBoolean());
}
case STRING -> {
return asString();
}
case NULL_VALUE -> {
return "null";
}
case START_OBJECT -> {
return "<object>";
}
case START_ARRAY -> {
return "<array>";
}
default -> {
return "unknown";
}
}
}
private class ArrayIterator implements Iterator<JsonValue> {
private final int endIdx;
private int idx;
ArrayIterator(int startIdx) {
idx = startIdx + 1;
endIdx = tape.getMatchingBraceIndex(startIdx) - 1;
}
@Override
public boolean hasNext() {
return idx < endIdx;
}
@Override
public JsonValue next() {
if (hasNext()) {
JsonValue value = new JsonValue(tape, idx, stringBuffer, buffer);
idx = tape.computeNextIndex(idx);
return value;
}
throw new NoSuchElementException("No more elements");
}
}
private class ObjectIterator implements Iterator<Map.Entry<String, JsonValue>> {
private final int endIdx;
private int idx;
ObjectIterator(int startIdx) {
idx = startIdx + 1;
endIdx = tape.getMatchingBraceIndex(startIdx) - 1;
}
@Override
public boolean hasNext() {
return idx < endIdx;
}
@Override
public Map.Entry<String, JsonValue> next() {
String key = getString(idx);
idx = tape.computeNextIndex(idx);
JsonValue value = new JsonValue(tape, idx, stringBuffer, buffer);
idx = tape.computeNextIndex(idx);
return new ObjectField(key, value);
}
}
private static class ObjectField implements Map.Entry<String, JsonValue> {
private final String key;
private final JsonValue value;
ObjectField(String key, JsonValue value) {
this.key = key;
this.value = value;
}
@Override
public String getKey() {
return key;
}
@Override
public JsonValue getValue() {
return value;
}
@Override
public JsonValue setValue(JsonValue value) {
throw new UnsupportedOperationException("Object fields are immutable");
}
}
}