/java/server/src/org/openqa/selenium/remote/server/handler/internal/ResultConverter.java

/*
Copyright 2007-2010 Selenium committers

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
 */

package org.openqa.selenium.remote.server.handler.internal;

import com.google.common.base.Function;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;

import org.openqa.selenium.WebElement;
import org.openqa.selenium.html5.ResultSet;
import org.openqa.selenium.html5.ResultSetRows;
import org.openqa.selenium.remote.server.KnownElements;

import java.util.List;
import java.util.Map;

/**
 * Converts an object to be sent as JSON according to the wire protocol.
 */
public class ResultConverter implements Function<Object, Object> {
  private final KnownElements knownElements;

  public ResultConverter(KnownElements knownElements) {
    this.knownElements = knownElements;
  }

  public Object apply(Object result) {
    if (result instanceof WebElement) {
      String elementId = knownElements.add((WebElement) result);
      return ImmutableMap.of("ELEMENT", elementId);
    }

    if (result instanceof List) {
      @SuppressWarnings("unchecked")
      List<Object> resultAsList = (List<Object>) result;
      return Lists.newArrayList(Iterables.transform(resultAsList, this));
    }

    if (result instanceof Map<?, ?>) {
      Map<?, ?> resultAsMap = (Map<?, ?>) result;
      Map<Object, Object> converted = Maps.newHashMapWithExpectedSize(resultAsMap.size());
      for (Map.Entry<?, ?> entry : resultAsMap.entrySet()) {
        converted.put(entry.getKey(), apply(entry.getValue()));
      }
      return converted;
    }

    if (result instanceof ResultSet) {
      Map<Object, Object> converted = Maps.newHashMap();
      converted.put("insertId", ((ResultSet) result).getLastInsertedRowId());
      converted.put("rowsAffected", ((ResultSet) result).getNumberOfRowsAffected());
      ResultSetRows rsRows = ((ResultSet) result).rows();
      List<Map<String, Object>> rows = Lists.newArrayList();
      for (int i = 0; i < rsRows.size(); i++) {
        rows.add(rsRows.item(i));
      }
      converted.put("rows", Lists.newArrayList(Iterables.transform(rows, this)));
      return converted;
    }

    return result;
  }
}