CustomMatchers.java

/***
 * Copyright (c) 2013 Liquid Democracy
 * All rights reserved.
 *
 * 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 br.edu.uniritter.liquid.democracy.validator;

import org.hamcrest.Description;
import org.hamcrest.TypeSafeMatcher;

/**
 * This class creates custom Hamcrest matchers for making validations more readable.
 *
 */
public class CustomMatchers {

    private static TypeSafeMatcher<String> EMPTY = new TypeSafeMatcher<String>() {

		// protected void describeMismatchSafely(String item, Description mismatchDescription) {
        //    mismatchDescription.appendText(" " + item);
        // }

        @Override
		public boolean matchesSafely(String item) {
            return item != null && !item.equals("");
        }

        public void describeTo(Description description) {
            description.appendText(" not empty");
        }

    };
    
    private static TypeSafeMatcher<Double> ZERO = new TypeSafeMatcher<Double>() {

        @Override
		public boolean matchesSafely(Double item) {
            return item != null && !(item == 0.0);
        }

        public void describeTo(Description description) {
            description.appendText(" not ZERO");
        }

    };
    
    private static TypeSafeMatcher<Object> NULL = new TypeSafeMatcher<Object>() {

        @Override
		public boolean matchesSafely(Object item) {
            return item != null;
        }

        public void describeTo(Description description) {
            description.appendText(" not null");
        }

    };

    /**
     * matches if the given string is not empty. This matcher is null-safe.
     * @return
     */
    public static TypeSafeMatcher<String> notEmpty() {
        return EMPTY;
    }
    
    /**
     * matches if the given string is not empty. This matcher is null-safe.
     * @return
     */
    public static TypeSafeMatcher<Double> notZero() {
        return ZERO;
    }
    
    /**
     * matches if the given object is not null.
     * @return
     */
    public static TypeSafeMatcher<Object> notNull() {
        return NULL;
    }

}