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package ai.vespa.json;
import com.yahoo.slime.Cursor;
import com.yahoo.slime.Inspector;
import com.yahoo.slime.ObjectTraverser;
import com.yahoo.slime.Slime;
import com.yahoo.slime.SlimeUtils;
import com.yahoo.slime.Type;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.Objects;
import java.util.Optional;
import java.util.OptionalDouble;
import java.util.OptionalLong;
import java.util.function.BiConsumer;
import java.util.function.Consumer;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;
import static com.yahoo.slime.Type.ARRAY;
import static com.yahoo.slime.Type.STRING;
/**
* A {@link Slime} wrapper that throws {@link InvalidJsonException} on missing members or invalid types.
*
* @author bjorncs
*/
public class Json implements Iterable<Json> {
private final Inspector inspector;
// Used to keep track of the path to the current node for error messages
private final String path;
public static Json of(Slime slime) { return of(slime.get()); }
public static Json of(Inspector inspector) { return new Json(inspector, ""); }
public static Json of(String json) { return of(SlimeUtils.jsonToSlime(json)); }
private Json(Inspector inspector, String path) {
this.inspector = Objects.requireNonNull(inspector);
this.path = Objects.requireNonNull(path);
}
public Json f(String field) { return field(field); }
public Json field(String field) {
requireType(Type.OBJECT);
return new Json(inspector.field(field), path.isEmpty() ? field : "%s.%s".formatted(path, field));
}
public Json a(int index) { return entry(index); }
public Json entry(int index) {
requireType(ARRAY);
return new Json(inspector.entry(index), "%s[%d]".formatted(path, index));
}
public int length() { return inspector.children(); }
public boolean has(String field) { return inspector.field(field).valid(); }
public boolean isPresent() { return inspector.valid(); }
public boolean isMissing() { return !isPresent(); }
public Optional<String> asOptionalString() { return Optional.ofNullable(asString(null)); }
public String asString() { requireType(STRING); return inspector.asString(); }
public String asString(String defaultValue) {
if (isMissing()) return defaultValue;
return asString();
}
public OptionalLong asOptionalLong() { return isMissing() ? OptionalLong.empty() : OptionalLong.of(asLong()); }
public long asLong() { requireType(Type.LONG, Type.DOUBLE); return inspector.asLong(); }
public long asLong(long defaultValue) {
if (isMissing()) return defaultValue;
return asLong();
}
public OptionalDouble asOptionalDouble() { return isMissing() ? OptionalDouble.empty() : OptionalDouble.of(asDouble()); }
public double asDouble() { requireType(Type.LONG, Type.DOUBLE); return inspector.asDouble(); }
public double asDouble(double defaultValue) {
if (isMissing()) return defaultValue;
return asDouble();
}
public Optional<Boolean> asOptionalBool() { return isMissing() ? Optional.empty() : Optional.of(asBool()); }
public boolean asBool() { requireType(Type.BOOL); return inspector.asBool(); }
public boolean asBool(boolean defaultValue) {
if (isMissing()) return defaultValue;
return asBool();
}
public List<Json> toList() {
var list = new ArrayList<Json>(length());
forEachEntry(json -> list.add(json));
return List.copyOf(list);
}
public Stream<Json> stream() { return StreamSupport.stream(this.spliterator(), false); }
public String toJson(boolean pretty) { return SlimeUtils.toJson(inspector, !pretty); }
public boolean isString() { return inspector.type() == STRING; }
public boolean isArray() { return inspector.type() == ARRAY; }
public boolean isLong() { return inspector.type() == Type.LONG; }
public boolean isDouble() { return inspector.type() == Type.DOUBLE; }
public boolean isBool() { return inspector.type() == Type.BOOL; }
public boolean isNumber() { return isLong() || isDouble(); }
public boolean isObject() { return inspector.type() == Type.OBJECT; }
@Override
public Iterator<Json> iterator() {
requireType(ARRAY);
return new Iterator<>() {
private int current = 0;
@Override public boolean hasNext() { return current < length(); }
@Override public Json next() { return entry(current++); }
};
}
public void forEachField(BiConsumer<String, Json> consumer) {
requireType(Type.OBJECT);
inspector.traverse((ObjectTraverser) (name, inspector) -> {
consumer.accept(name, field(name));
});
}
public void forEachEntry(BiConsumer<Integer, Json> consumer) {
requireType(ARRAY);
for (int i = 0; i < length(); i++) {
consumer.accept(i, entry(i));
}
}
public void forEachEntry(Consumer<Json> consumer) {
requireType(ARRAY);
for (int i = 0; i < length(); i++) {
consumer.accept(entry(i));
}
}
private void requireType(Type... types) {
requirePresent();
if (!List.of(types).contains(inspector.type())) throw createInvalidTypeException(types);
}
private void requirePresent() { if (isMissing()) throw createMissingMemberException(); }
private InvalidJsonException createInvalidTypeException(Type... expected) {
var expectedTypesString = Arrays.stream(expected).map(this::toString).collect(Collectors.joining("' or '", "'", "'"));
var pathString = path.isEmpty() ? "JSON" : "JSON member '%s'".formatted(path);
return new InvalidJsonException(
"Expected %s to be a %s but got '%s'"
.formatted(pathString, expectedTypesString, toString(inspector.type())));
}
private InvalidJsonException createMissingMemberException() {
return new InvalidJsonException(path.isEmpty() ? "Missing JSON" : "Missing JSON member '%s'".formatted(path));
}
private String toString(Type type) {
return switch (type) {
case NIX -> "null";
case BOOL -> "boolean";
case LONG -> "integer";
case DOUBLE -> "float";
case STRING, DATA -> "string";
case ARRAY -> "array";
case OBJECT -> "object";
};
}
@Override
public String toString() {
return "Json{" +
"inspector=" + inspector +
", path='" + path + '\'' +
'}';
}
/** Provides a fluent API for building a {@link Slime} instance. */
public static class Builder {
protected final Cursor cursor;
public static Builder.Array newArray() { return new Builder.Array(new Slime().setArray()); }
public static Builder.Object newObject() { return new Builder.Object(new Slime().setObject()); }
public static Builder.Object existingObject(Cursor cursor) { return new Builder.Object(cursor); }
private Builder(Cursor cursor) { this.cursor = cursor; }
public static class Array extends Builder {
private Array(Cursor cursor) { super(cursor); }
public Builder.Array add(Builder.Array array) {
SlimeUtils.copyArray(array.cursor, cursor.addArray()); return this;
}
public Builder.Array add(Builder.Object object) {
SlimeUtils.copyObject(object.cursor, cursor.addObject()); return this;
}
public Builder.Array add(Json json) {
SlimeUtils.addValue(json.inspector, cursor.addObject()); return this;
}
/** Note: does not return {@code this}! */
public Builder.Array addArray() { return new Array(cursor.addArray()); }
/** Note: does not return {@code this}! */
public Builder.Object addObject() { return new Object(cursor.addObject()); }
public Builder.Array add(String value) { cursor.addString(value); return this; }
public Builder.Array add(long value) { cursor.addLong(value); return this; }
public Builder.Array add(double value) { cursor.addDouble(value); return this; }
public Builder.Array add(boolean value) { cursor.addBool(value); return this; }
}
public static class Object extends Builder {
private Object(Cursor cursor) { super(cursor); }
public Builder.Object set(String field, Builder.Array array) {
SlimeUtils.copyArray(array.cursor, cursor.setArray(field)); return this;
}
public Builder.Object set(String field, Builder.Object object) {
SlimeUtils.copyObject(object.cursor, cursor.setObject(field)); return this;
}
public Builder.Object set(String field, Json json) {
SlimeUtils.setObjectEntry(json.inspector, field, cursor); return this;
}
/** Note: does not return {@code this}! */
public Builder.Array setArray(String field) { return new Array(cursor.setArray(field)); }
/** Note: does not return {@code this}! */
public Builder.Object setObject(String field) { return new Object(cursor.setObject(field)); }
public Builder.Object set(String field, String value) { cursor.setString(field, value); return this; }
public Builder.Object set(String field, long value) { cursor.setLong(field, value); return this; }
public Builder.Object set(String field, double value) { cursor.setDouble(field, value); return this; }
public Builder.Object set(String field, boolean value) { cursor.setBool(field, value); return this; }
public Builder.Object set(String field, BigDecimal value) { cursor.setString(field, value.toPlainString()); return this; }
}
public Cursor slimeCursor() { return cursor; }
public Json build() { return Json.of(cursor); }
}
}
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