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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.document.json.document;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonToken;
import com.yahoo.document.DocumentId;
import com.yahoo.document.json.DocumentOperationType;
import com.yahoo.document.json.readers.DocumentParseInfo;
import java.io.IOException;
import java.util.Optional;
/**
* Parses a document operation.
*
* @author Haakon Dybdahl
*/
public class DocumentParser {
private static final String UPDATE = "update";
private static final String PUT = "put";
private static final String ID = "id";
public static final String CONDITION = "condition";
public static final String CREATE_IF_NON_EXISTENT = "create";
public static final String FIELDS = "fields";
public static final String REMOVE = "remove";
private final JsonParser parser;
private long indentLevel;
public DocumentParser(JsonParser parser) {
this.parser = parser;
}
/**
* Parses a single document and returns it.
* Returns empty if we have reached the end of the stream.
*/
public Optional<DocumentParseInfo> parse(Optional<DocumentId> documentIdArg) throws IOException {
indentLevel = 0;
DocumentParseInfo documentParseInfo = new DocumentParseInfo();
documentIdArg.ifPresent(documentId -> documentParseInfo.documentId = documentId);
boolean foundItems = false;
do {
foundItems |= parseOneItem(documentParseInfo, documentIdArg.isPresent() /* doc id set externally */);
} while (indentLevel > 0L);
if (documentParseInfo.documentId == null) {
if (foundItems)
throw new IllegalArgumentException("Missing a document operation ('put', 'update' or 'remove')");
else
return Optional.empty();
}
return Optional.of(documentParseInfo);
}
/**
* Parses one item from the stream.
*
* @return whether an item was found
*/
private boolean parseOneItem(DocumentParseInfo documentParseInfo, boolean docIdAndOperationIsSetExternally) throws IOException {
parser.nextValue();
processIndent();
if (parser.getCurrentName() == null) return false;
if (indentLevel == 1L) {
handleIdentLevelOne(documentParseInfo, docIdAndOperationIsSetExternally);
} else if (indentLevel == 2L) {
handleIdentLevelTwo(documentParseInfo);
}
return true;
}
private void processIndent() {
JsonToken currentToken = parser.currentToken();
if (currentToken == null) {
throw new IllegalArgumentException("Could not read document, no document?");
}
switch (currentToken) {
case START_OBJECT -> indentLevel++;
case END_OBJECT -> indentLevel--;
case START_ARRAY -> indentLevel += 10000L;
case END_ARRAY -> indentLevel -= 10000L;
}
}
private void handleIdentLevelOne(DocumentParseInfo documentParseInfo, boolean docIdAndOperationIsSetExternally)
throws IOException {
JsonToken currentToken = parser.getCurrentToken();
if ((currentToken == JsonToken.VALUE_TRUE || currentToken == JsonToken.VALUE_FALSE) &&
CREATE_IF_NON_EXISTENT.equals(parser.getCurrentName())) {
documentParseInfo.create = Optional.of(currentToken == JsonToken.VALUE_TRUE);
} else if (currentToken == JsonToken.VALUE_STRING && CONDITION.equals(parser.getCurrentName())) {
documentParseInfo.condition = Optional.of(parser.getText());
} else if (currentToken == JsonToken.VALUE_STRING) {
// Value is expected to be set in the header not in the document. Ignore any unknown field
// as well.
if (! docIdAndOperationIsSetExternally) {
documentParseInfo.operationType = operationNameToOperationType(parser.getCurrentName());
documentParseInfo.documentId = new DocumentId(parser.getText());
}
}
}
private void handleIdentLevelTwo(DocumentParseInfo documentParseInfo) {
try {
// "fields" opens a dictionary and is therefore on level two which might be surprising.
if (parser.currentToken() == JsonToken.START_OBJECT && FIELDS.equals(parser.getCurrentName())) {
documentParseInfo.fieldsBuffer.bufferObject(parser);
processIndent();
}
} catch (IOException e) {
throw new RuntimeException("Got IO exception while parsing document", e);
}
}
private static DocumentOperationType operationNameToOperationType(String operationName) {
return switch (operationName) {
case PUT, ID -> DocumentOperationType.PUT;
case REMOVE -> DocumentOperationType.REMOVE;
case UPDATE -> DocumentOperationType.UPDATE;
default -> throw new IllegalArgumentException("Got " + operationName + " as document operation, only \"put\", " +
"\"remove\" and \"update\" are supported.");
};
}
}
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