001    /*
002     * Created on Jul 8, 2008
003     * 
004     * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
005     * in compliance with the License. You may obtain a copy of the License at
006     * 
007     * http://www.apache.org/licenses/LICENSE-2.0
008     * 
009     * Unless required by applicable law or agreed to in writing, software distributed under the License
010     * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
011     * or implied. See the License for the specific language governing permissions and limitations under
012     * the License.
013     * 
014     * Copyright @2008-2010 the original author or authors.
015     */
016    package org.fest.swing.fixture;
017    
018    import java.awt.Component;
019    
020    import org.fest.swing.core.Robot;
021    
022    /**
023     * Understands a validator of common objects used in component fixtures.
024     *
025     * @author Alex Ruiz 
026     */
027    public final class ComponentFixtureValidator {
028    
029      /**
030       * Verifies that the given <code>{@link Robot}</code> is not <code>null</code>.
031       * @param robot the <code>Robot</code> to verify.
032       * @return the given <code>Robot</code>.
033       * @throws NullPointerException if <code>robot</code> is <code>null</code>.
034       */
035      public static Robot notNullRobot(Robot robot) {
036        if (robot == null) throw new NullPointerException("Robot should not be null");
037        return robot;
038      }
039      
040      /**
041       * Verifies that the given <code>{@link Component}</code> is not <code>null</code>.
042       * @param <T> specifies the type of <code>Component</code> to return.
043       * @param target the <code>Component</code> to verify.
044       * @return the given target <code>Component</code>.
045       * @throws NullPointerException if <code>target</code> is <code>null</code>.
046       */
047      public static <T extends Component> T notNullTarget(T target) {
048        if (target == null) throw new NullPointerException("Target component should not be null");
049        return target;
050      }
051      
052      private ComponentFixtureValidator() {}
053    }