HelloWorldExpression.java

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2014 Thomas Morgner
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package org.pentaho.reporting.sdk.expression;

import org.pentaho.reporting.engine.classic.core.function.AbstractExpression;
import org.pentaho.reporting.engine.classic.core.function.Expression;
import org.pentaho.reporting.libraries.base.util.StringUtils;

public class HelloWorldExpression extends AbstractExpression
{
  private String field;

  public HelloWorldExpression()
  {
  }

  public String getField()
  {
    return field;
  }

  public void setField(final String field)
  {
    this.field = field;
  }

  public Expression getInstance()
  {
    return super.getInstance();
  }

  private String computeGreetingName()
  {
    if (StringUtils.isEmpty(getField()))
    {
      return null;
    }

    Object raw = getDataRow().get(getField());
    if (raw == null)
    {
      return null;
    }

    String text = String.valueOf(raw);
    if (StringUtils.isEmpty(text))
    {
      return null;
    }

    return text;
  }

  public Object getValue()
  {
    String text = computeGreetingName();
    if (text == null)
    {
      return String.format("Hello World!", text);
    }

    return String.format("Hello World, %s!", text);
  }
}