feat: Add CsvAgentResponseHandler and corresponding tests for CSV parsing functionality
This commit is contained in:
extio-de
@@ -0,0 +1,259 @@
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package de.extio.lmlib.agent.responsehandler;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Field;
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import java.lang.reflect.ParameterizedType;
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import java.lang.reflect.Type;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.List;
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import java.util.regex.Pattern;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import de.extio.lmlib.agent.AgentContext;
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import de.extio.lmlib.client.Completion;
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import de.extio.lmlib.client.Conversation;
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public class CsvAgentResponseHandler implements AgentResponseHandler {
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private static final Logger LOGGER = LoggerFactory.getLogger(CsvAgentResponseHandler.class);
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private final Class<?> targetClass;
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private final String contextKey;
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private final String fieldSeparator;
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private final String listSeparator;
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private final Field[] fields;
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private final List<String> fieldNames;
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private final Constructor<?> constructor;
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private final String fieldSeparatorQuoted;
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private final String listSeparatorQuoted;
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private final String errorPromptSuffix;
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public CsvAgentResponseHandler(final Class<?> targetClass, final String contextKey) {
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this(targetClass, contextKey, ";", ",");
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}
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public CsvAgentResponseHandler(final Class<?> targetClass, final String contextKey,
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final String fieldSeparator, final String listSeparator) {
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this.targetClass = targetClass;
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this.contextKey = contextKey;
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this.fieldSeparator = fieldSeparator;
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this.listSeparator = listSeparator;
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// Pre-compute static data
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this.fields = targetClass.getDeclaredFields();
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this.fieldNames = Arrays.stream(this.fields)
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.map(Field::getName)
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.toList();
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this.constructor = this.findRecordConstructor();
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if (this.constructor == null) {
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throw new IllegalStateException("No suitable constructor found for " + targetClass.getName());
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}
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this.fieldSeparatorQuoted = Pattern.quote(fieldSeparator);
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this.listSeparatorQuoted = (listSeparator != null && !listSeparator.isEmpty())
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? Pattern.quote(listSeparator)
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: null;
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// Pre-compute error message suffix
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final String listInfo = (listSeparator != null && !listSeparator.isEmpty())
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? " and '" + listSeparator + "' for list items"
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: "";
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this.errorPromptSuffix = "\n\nThe previous response could not be fully processed or validated. " +
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"Please format the response as CSV with '" + fieldSeparator + "' as field separator" +
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listInfo + ". One object per line.";
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}
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private Constructor<?> findRecordConstructor() {
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final Field[] targetFields = this.targetClass.getDeclaredFields();
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for (final Constructor<?> ctor : this.targetClass.getDeclaredConstructors()) {
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if (ctor.getParameterCount() == targetFields.length) {
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return ctor;
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}
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}
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return null;
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}
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@Override
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public boolean handle(final Completion completion, final AgentContext context) {
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final String resp = completion.response();
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if (resp == null || resp.isBlank()) {
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LOGGER.warn("Empty completion response for CSV parsing");
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return false;
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}
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try {
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final List<Object> parsedObjects = this.parseCsv(resp);
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if (parsedObjects.isEmpty()) {
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LOGGER.warn("No valid CSV data parsed from response");
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this.addCsvResponseErrorPrompt(context);
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return false;
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}
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context.setValues(this.contextKey, parsedObjects);
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LOGGER.debug("Parsed {} CSV objects", parsedObjects.size());
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return true;
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}
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catch (final Exception ex) {
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LOGGER.warn("Failed to parse CSV response", ex);
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this.addCsvResponseErrorPrompt(context);
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return false;
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}
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}
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private List<Object> parseCsv(final String csvText) throws Exception {
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final List<Object> result = new ArrayList<>();
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final String[] lines = csvText.split("\n");
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int startLine = 0;
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for (int i = 0; i < lines.length; i++) {
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final String line = lines[i].trim();
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if (line.isEmpty()) {
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continue;
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}
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if (!line.contains(this.fieldSeparator)) {
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startLine = i + 1;
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continue;
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}
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final String lowerLine = line.toLowerCase();
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boolean isHeader = false;
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for (final String fieldName : this.fieldNames) {
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if (lowerLine.contains(fieldName.toLowerCase())) {
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isHeader = true;
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break;
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}
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}
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if (isHeader) {
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startLine = i + 1;
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continue;
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}
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break;
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}
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for (int i = startLine; i < lines.length; i++) {
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final String line = lines[i].trim();
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if (line.isEmpty()) {
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continue;
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}
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if (!line.contains(this.fieldSeparator)) {
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continue;
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}
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try {
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final Object obj = this.parseLine(line);
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if (obj != null) {
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result.add(obj);
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}
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}
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catch (final Exception ex) {
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LOGGER.debug("Failed to parse line '{}': {}", line, ex.getMessage());
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}
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}
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return result;
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}
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private Object parseLine(final String line) throws Exception {
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final String[] parts = line.split(this.fieldSeparatorQuoted, -1);
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if (parts.length != this.fields.length) {
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LOGGER.debug("Field count mismatch: expected {}, got {} for line '{}'",
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this.fields.length, parts.length, line);
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return null;
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}
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final Object[] args = new Object[this.fields.length];
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for (int i = 0; i < this.fields.length; i++) {
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final String value = parts[i].trim();
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args[i] = this.parseValue(value, this.fields[i]);
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}
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return this.constructor.newInstance(args);
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}
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private Object parseValue(final String value, final Field field) {
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final Class<?> fieldType = field.getType();
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if (value.isEmpty() || value.equalsIgnoreCase("null")) {
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if (fieldType == List.class) {
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return new ArrayList<>();
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}
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return null;
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}
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if (fieldType == String.class) {
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return value;
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}
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if (fieldType == Integer.class || fieldType == int.class) {
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return Integer.parseInt(value);
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}
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if (fieldType == Long.class || fieldType == long.class) {
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return Long.parseLong(value);
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}
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if (fieldType == Double.class || fieldType == double.class) {
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return Double.parseDouble(value);
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}
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if (fieldType == Boolean.class || fieldType == boolean.class) {
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return Boolean.parseBoolean(value);
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}
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if (fieldType == List.class) {
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if (this.listSeparatorQuoted == null) {
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return new ArrayList<>();
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}
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final Type genericType = field.getGenericType();
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if (genericType instanceof ParameterizedType) {
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final ParameterizedType paramType = (ParameterizedType) genericType;
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final Type[] typeArgs = paramType.getActualTypeArguments();
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if (typeArgs.length > 0 && typeArgs[0] == String.class) {
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if (value.isEmpty()) {
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return new ArrayList<String>();
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}
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final String[] items = value.split(this.listSeparatorQuoted);
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final List<String> list = new ArrayList<>();
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for (final String item : items) {
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final String trimmed = item.trim();
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if (!trimmed.isEmpty()) {
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list.add(trimmed);
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}
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}
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return list;
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}
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}
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}
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throw new IllegalArgumentException("Unsupported field type: " + fieldType.getName());
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}
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private void addCsvResponseErrorPrompt(final AgentContext context) {
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final var turn = context.getConversation().getConversation().getLast();
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context.getConversation().replaceTurn(new Conversation.Turn(
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turn.type(),
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turn.text() + this.errorPromptSuffix));
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}
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}
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