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/*
* Copyright (C) 2008 The Guava Authors
*
* 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.google.common.collect.testing.testers;
import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_VALUES;
import static com.google.common.collect.testing.features.CollectionSize.ZERO;
import static com.google.common.collect.testing.features.ListFeature.SUPPORTS_SET;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;
import com.google.common.collect.testing.features.ListFeature;
import java.lang.reflect.Method;
/**
* A generic JUnit test which tests {@code set()} operations on a list. Can't be
* invoked directly; please see
* {@link com.google.common.collect.testing.ListTestSuiteBuilder}.
*
* <p>This class is GWT compatible.
*
* @author George van den Driessche
*/
public class ListSetTester<E> extends AbstractListTester<E> {
@ListFeature.Require(SUPPORTS_SET)
@CollectionSize.Require(absent = ZERO)
public void testSet() {
doTestSet(samples.e3);
}
@CollectionSize.Require(absent = ZERO)
@CollectionFeature.Require(ALLOWS_NULL_VALUES)
@ListFeature.Require(SUPPORTS_SET)
public void testSet_null() {
doTestSet(null);
}
@CollectionSize.Require(absent = ZERO)
@CollectionFeature.Require(ALLOWS_NULL_VALUES)
@ListFeature.Require(SUPPORTS_SET)
public void testSet_replacingNull() {
E[] elements = createSamplesArray();
int i = aValidIndex();
elements[i] = null;
collection = getSubjectGenerator().create(elements);
doTestSet(samples.e3);
}
private void doTestSet(E newValue) {
int index = aValidIndex();
E initialValue = getList().get(index);
assertEquals("set(i, x) should return the old element at position i.",
initialValue, getList().set(index, newValue));
assertEquals("After set(i, x), get(i) should return x",
newValue, getList().get(index));
assertEquals("set() should not change the size of a list.",
getNumElements(), getList().size());
}
@ListFeature.Require(SUPPORTS_SET)
public void testSet_indexTooLow() {
try {
getList().set(-1, samples.e3);
fail("set(-1) should throw IndexOutOfBoundsException");
} catch (IndexOutOfBoundsException expected) {
}
expectUnchanged();
}
@ListFeature.Require(SUPPORTS_SET)
public void testSet_indexTooHigh() {
int index = getNumElements();
try {
getList().set(index, samples.e3);
fail("set(size) should throw IndexOutOfBoundsException");
} catch (IndexOutOfBoundsException expected) {
}
expectUnchanged();
}
@CollectionSize.Require(absent = ZERO)
@ListFeature.Require(absent = SUPPORTS_SET)
public void testSet_unsupported() {
try {
getList().set(aValidIndex(), samples.e3);
fail("set() should throw UnsupportedOperationException");
} catch (UnsupportedOperationException expected) {
}
expectUnchanged();
}
@CollectionSize.Require(ZERO)
@ListFeature.Require(absent = SUPPORTS_SET)
public void testSet_unsupportedByEmptyList() {
try {
getList().set(0, samples.e3);
fail("set() should throw UnsupportedOperationException "
+ "or IndexOutOfBoundsException");
} catch (UnsupportedOperationException tolerated) {
} catch (IndexOutOfBoundsException tolerated) {
}
expectUnchanged();
}
@CollectionSize.Require(absent = ZERO)
@ListFeature.Require(SUPPORTS_SET)
@CollectionFeature.Require(absent = ALLOWS_NULL_VALUES)
public void testSet_nullUnsupported() {
try {
getList().set(aValidIndex(), null);
fail("set(null) should throw NullPointerException");
} catch (NullPointerException expected) {
}
expectUnchanged();
}
private int aValidIndex() {
return getList().size() / 2;
}
/**
* Returns the {@link java.lang.reflect.Method} instance for
* {@link #testSet_null()} so that tests of {@link
* java.util.Collections#checkedCollection(java.util.Collection, Class)} can
* suppress it with {@code FeatureSpecificTestSuiteBuilder.suppressing()}
* until <a
* href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6409434">Sun bug
* 6409434</a> is fixed. It's unclear whether nulls were to be permitted or
* forbidden, but presumably the eventual fix will be to permit them, as it
* seems more likely that code would depend on that behavior than on the
* other. Thus, we say the bug is in set(), which fails to support null.
*/
public static Method getSetNullSupportedMethod() {
return Platform.getMethod(ListSetTester.class, "testSet_null");
}
}
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