org.springframework.data.gemfire.domain.support.AbstractSliceSupport Maven / Gradle / Ivy
/*
* Copyright 2016-2020 the original author or 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
*
* https://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 org.springframework.data.gemfire.domain.support;
import static org.springframework.data.gemfire.util.RuntimeExceptionFactory.newUnsupportedOperationException;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.Function;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Slice;
import org.springframework.data.domain.Sort;
import org.springframework.data.gemfire.util.RuntimeExceptionFactory;
/**
* The {@link AbstractSliceSupport} class is an abstract Spring Data {@link Slice} type
* supporting the implementation of application specific {@link Slice} implementations.
*
* @author John Blum
* @param {@link Class} type of the individual elements on this {@link Slice}.
* @see org.springframework.core.convert.converter.Converter
* @see org.springframework.data.domain.Page
* @see org.springframework.data.domain.Pageable
* @see org.springframework.data.domain.Slice
* @see org.springframework.data.domain.Sort
* @since 1.1.0
*/
@SuppressWarnings("unused")
public abstract class AbstractSliceSupport implements Slice {
/**
* @inheritDoc
*/
@Override
public boolean hasContent() {
return (getNumberOfElements() > 0);
}
/**
* @inheritDoc
*/
@Override
public boolean hasNext() {
throw newUnsupportedOperationException(RuntimeExceptionFactory.NOT_IMPLEMENTED);
}
/**
* @inheritDoc
*/
@Override
public boolean hasPrevious() {
throw newUnsupportedOperationException(RuntimeExceptionFactory.NOT_IMPLEMENTED);
}
/**
* @inheritDoc
*/
@Override
public boolean isFirst() {
return !hasPrevious();
}
/**
* @inheritDoc
*/
@Override
public boolean isLast() {
return !hasNext();
}
/**
* @inheritDoc
*/
@Override
public List getContent() {
throw newUnsupportedOperationException(RuntimeExceptionFactory.NOT_IMPLEMENTED);
}
/**
* @inheritDoc
*/
@Override
public int getNumber() {
AtomicInteger number = new AtomicInteger(1);
Optional.ofNullable(previousPageable()).ifPresent(previousPageable -> {
Pageable currentPageable;
do {
number.incrementAndGet();
currentPageable = previousPageable;
previousPageable = previousPageable.previousOrFirst();
}
while (currentPageable != previousPageable);
});
return number.get();
}
/**
* @inheritDoc
*/
@Override
public int getNumberOfElements() {
return getContent().size();
}
/**
* @inheritDoc
*/
@Override
public int getSize() {
return getNumberOfElements();
}
/**
* @inheritDoc
*/
@Override
public Sort getSort() {
throw newUnsupportedOperationException(RuntimeExceptionFactory.NOT_IMPLEMENTED);
}
/**
* @inheritDoc
*/
@Override
public Iterator iterator() {
return Collections.unmodifiableList(Optional.ofNullable(getContent())
.orElseGet(Collections::emptyList)).iterator();
}
/**
* @inheritDoc
*/
@Override
public Slice map(Function converter) {
throw newUnsupportedOperationException(RuntimeExceptionFactory.NOT_IMPLEMENTED);
}
/**
* @inheritDoc
*/
@Override
public Pageable nextPageable() {
throw newUnsupportedOperationException(RuntimeExceptionFactory.NOT_IMPLEMENTED);
}
/**
* @inheritDoc
*/
@Override
public Pageable previousPageable() {
throw newUnsupportedOperationException(RuntimeExceptionFactory.NOT_IMPLEMENTED);
}
}