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/*
Copyright 2007-2009 WebDriver committers
Copyright 2007-2009 Google Inc.

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.internal.seleniumemulation;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import com.thoughtworks.selenium.SeleniumException;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;

public class GetTable extends SeleneseCommand {
  private static final Pattern TABLE_PARTS = Pattern.compile("(.*)\\.(\\d+)\\.(\\d+)");
  private final ElementFinder finder;
  private final JavascriptLibrary js;

  public GetTable(ElementFinder finder, JavascriptLibrary js) {
    this.finder = finder;
    this.js = js;
  }

  @Override
  protected String handleSeleneseCommand(WebDriver driver, String tableCellAddress, String ignored) {
    Matcher matcher = TABLE_PARTS.matcher(tableCellAddress);
    if (!matcher.matches()) {
      throw new SeleniumException("Invalid target format. Correct format is tableName.rowNum.columnNum");
    }

    String tableName = matcher.group(1);
    long row = Long.parseLong(matcher.group(2));
    long col = Long.parseLong(matcher.group(3));

    WebElement table = finder.findElement(driver, tableName);

    String script =
        "var table = arguments[0]; var row = arguments[1]; var col = arguments[2];" +
        "if (row > table.rows.length) { return \"Cannot access row \" + row + \" - table has \" + table.rows.length + \" rows\"; }" +
        "if (col > table.rows[row].cells.length) { return \"Cannot access column \" + col + \" - table row has \" + table.rows[row].cells.length + \" columns\"; }" +
        "return table.rows[row].cells[col];";

    Object value = js.executeScript(driver, script, table, row, col);
    if (value instanceof WebElement) {
      return ((WebElement) value).getText().trim();
    }

    throw new SeleniumException((String) value);
  }
}