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Android example source code file (PredicatesTest.java)

This example Android source code file (PredicatesTest.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" TM.

Java - Android tags/keywords

arraylist, exception, false, predicate, predicatestest, testcase, true, util

The PredicatesTest.java Android example source code

/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * 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 com.android.internal.util;

import junit.framework.TestCase;

import java.util.ArrayList;
import java.util.Collections;

public class PredicatesTest extends TestCase {

    private static final Predicate<Object> TRUE = new Predicate() {
        public boolean apply(Object o) {
            return true;
        }
    };

    private static final Predicate<Object> FALSE = new Predicate() {
        public boolean apply(Object o) {
            return false;
        }
    };

    public void testAndPredicate_AllConditionsTrue() throws Exception {
        assertTrue(Predicates.and(newArrayList(TRUE)).apply(null));
        assertTrue(Predicates.and(newArrayList(TRUE, TRUE)).apply(null));
    }

    public void testAndPredicate_AtLeastOneConditionIsFalse() throws Exception {
        assertFalse(Predicates.and(newArrayList(FALSE, TRUE, TRUE)).apply(null));
        assertFalse(Predicates.and(newArrayList(TRUE, FALSE, TRUE)).apply(null));
        assertFalse(Predicates.and(newArrayList(TRUE, TRUE, FALSE)).apply(null));
    }

    public void testOrPredicate_AllConditionsTrue() throws Exception {
        assertTrue(Predicates.or(newArrayList(TRUE, TRUE, TRUE)).apply(null));
    }

    public void testOrPredicate_AllConditionsFalse() throws Exception {
        assertFalse(Predicates.or(newArrayList(FALSE, FALSE, FALSE)).apply(null));
    }

    public void testOrPredicate_AtLeastOneConditionIsTrue() throws Exception {
        assertTrue(Predicates.or(newArrayList(TRUE, FALSE, FALSE)).apply(null));
        assertTrue(Predicates.or(newArrayList(FALSE, TRUE, FALSE)).apply(null));
        assertTrue(Predicates.or(newArrayList(FALSE, FALSE, TRUE)).apply(null));
    }

    public void testNotPredicate() throws Exception {
        assertTrue(Predicates.not(FALSE).apply(null));
        assertFalse(Predicates.not(TRUE).apply(null));
    }

    private static <E> ArrayList newArrayList(E... elements) {
        ArrayList<E> list = new ArrayList();
        Collections.addAll(list, elements);
        return list;
    }

}




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