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A general programming library in Java/Android. It's easy to learn and simple to use with concise and powerful APIs.
/*
* Copyright (C) 2016 HaiYang Li
*
* 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.landawn.abacus.util;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.Set;
import java.util.SortedSet;
/**
*
* @author Haiyang Li
* @param
* @since 0.8
*/
public class ImmutableSet extends ImmutableCollection implements Set {
@SuppressWarnings("rawtypes")
private static final ImmutableSet EMPTY = new ImmutableSet(Collections.emptySet());
ImmutableSet(Set set) {
super(Collections.unmodifiableSet(set));
}
/**
*
* @param
* @return
*/
public static ImmutableSet empty() {
return EMPTY;
}
/**
*
*
* @param
* @param e
* @return
*/
public static ImmutableSet just(T e) {
return new ImmutableSet<>(Collections.singleton(e));
}
/**
*
*
* @param
* @param e1
* @return
*/
public static ImmutableSet of(final T e1) {
return new ImmutableSet<>(N.asSet(e1));
}
/**
*
*
* @param
* @param e1
* @param e2
* @return
*/
public static ImmutableSet of(final T e1, final T e2) {
return new ImmutableSet<>(N.asSet(e1, e2));
}
/**
*
*
* @param
* @param e1
* @param e2
* @param e3
* @return
*/
public static ImmutableSet of(final T e1, final T e2, final T e3) {
return new ImmutableSet<>(N.asSet(e1, e2, e3));
}
/**
*
*
* @param
* @param e1
* @param e2
* @param e3
* @param e4
* @return
*/
public static ImmutableSet of(final T e1, final T e2, final T e3, final T e4) {
return new ImmutableSet<>(N.asSet(e1, e2, e3, e4));
}
/**
*
*
* @param
* @param e1
* @param e2
* @param e3
* @param e4
* @param e5
* @return
*/
public static ImmutableSet of(final T e1, final T e2, final T e3, final T e4, final T e5) {
return new ImmutableSet<>(N.asSet(e1, e2, e3, e4, e5));
}
/**
*
*
* @param
* @param e1
* @param e2
* @param e3
* @param e4
* @param e5
* @param e6
* @return
*/
public static ImmutableSet of(final T e1, final T e2, final T e3, final T e4, final T e5, final T e6) {
return new ImmutableSet<>(N.asSet(e1, e2, e3, e4, e5, e6));
}
/**
*
*
* @param
* @param e1
* @param e2
* @param e3
* @param e4
* @param e5
* @param e6
* @param e7
* @return
*/
public static ImmutableSet of(final T e1, final T e2, final T e3, final T e4, final T e5, final T e6, final T e7) {
return new ImmutableSet<>(N.asSet(e1, e2, e3, e4, e5, e6, e7));
}
/**
*
* @param
* @param a
* @return
*/
@SafeVarargs
public static ImmutableSet of(final E... a) {
if (N.isNullOrEmpty(a)) {
return empty();
} else if (a.length == 1) {
return new ImmutableSet<>(N.asSet(a[0]));
} else {
return new ImmutableSet<>(N.asSet(N.clone(a)));
}
}
/**
*
* @param
* @param set
* @return
*/
public static ImmutableSet copyOf(final Collection set) {
if (N.isNullOrEmpty(set)) {
return empty();
}
return new ImmutableSet<>((set instanceof LinkedHashSet || set instanceof SortedSet) ? N.newLinkedHashSet(set) : N.newHashSet(set));
}
/**
*
* @param
* @param set
* @return an {@code ImmutableSet} backed by the specified {@code set}
* @deprecated the ImmutableSet may be modified through the specified {@code set}
*/
@Deprecated
public static ImmutableSet wrap(final Set set) {
if (set == null) {
return empty();
} else if (set instanceof ImmutableSet) {
return (ImmutableSet) set;
}
return new ImmutableSet<>(set);
}
/**
*
*
* @param
* @param c
* @return
* @throws UnsupportedOperationException
* @deprecated throws {@code UnsupportedOperationException}
*/
@Deprecated
public static ImmutableCollection wrap(final Collection c) throws UnsupportedOperationException {
throw new UnsupportedOperationException();
}
/**
*
*
* @param
* @return
*/
public static Builder builder() {
return new Builder<>();
}
public static final class Builder {
private final Set ret = new HashSet<>();
/**
*
*
* @param element
* @return
*/
public Builder add(final E element) {
ret.add(element);
return this;
}
/**
*
*
* @param elements
* @return
*/
public Builder add(final E... elements) {
if (N.notNullOrEmpty(elements)) {
ret.addAll(Arrays.asList(elements));
}
return this;
}
/**
*
*
* @param c
* @return
*/
public Builder addAll(final Collection c) {
if (N.notNullOrEmpty(c)) {
ret.addAll(c);
}
return this;
}
/**
*
*
* @param iter
* @return
*/
public Builder addAll(final Iterator iter) {
if (iter != null) {
while (iter.hasNext()) {
ret.add(iter.next());
}
}
return this;
}
/**
*
*
* @return
*/
public ImmutableSet build() {
return new ImmutableSet<>(ret);
}
}
}