#667

Committed 02 Sep 2023 01:21PM UTC coverage: 99.462% (-0.2%) from 99.619%

Build # #667

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push

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Commit Message

One more test for Limiter

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5733 of 5764 relevant lines covered (99.46%)

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98.73

/src/main/java/one/util/streamex/WithFirstSpliterator.java

/*
 * Copyright 2015, 2019 StreamEx contributors
 *
 * 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 one.util.streamex;

import java.util.Spliterator;
import java.util.concurrent.locks.ReentrantLock;
import java.util.function.BiFunction;
import java.util.function.Consumer;

import one.util.streamex.Internals.CloneableSpliterator;

/**
 * @author Tagir Valeev
 */
/* package */final class WithFirstSpliterator<T, R> extends CloneableSpliterator<R, WithFirstSpliterator<T, R>> implements Consumer<T> {
    private static final int STATE_NONE = 0;
    private static final int STATE_FIRST_READ = 1;
    private static final int STATE_INIT = 2;
    private static final int STATE_EMPTY = 3;

    private ReentrantLock lock;
    private Spliterator<T> source;
    private WithFirstSpliterator<T, R> prefix;
    private volatile T first;
    private volatile int state = STATE_NONE;
    private final BiFunction<? super T, ? super T, ? extends R> mapper;
    private Consumer<? super R> action;
    
    WithFirstSpliterator(Spliterator<T> source, BiFunction<? super T, ? super T, ? extends R> mapper) {
        this.source = source;
        this.mapper = mapper;
    }
    
    private void acquire() {
        if (lock != null && state == STATE_NONE) {
            lock.lock();
        }
    }
    
    private void release() {
        if (lock != null && lock.isHeldByCurrentThread()) {
            lock.unlock();
        }
    }

    @Override
    public boolean tryAdvance(Consumer<? super R> action) {
        if (state == STATE_NONE) {
            acquire();
            try {
                doInit();
            } finally {
                release();
            }
        }
        if (state == STATE_FIRST_READ) {
            state = STATE_INIT;
            action.accept(mapper.apply(first, first));
            return true;
        }
        if (state != STATE_INIT)
            return false;
        this.action = action;
        boolean hasNext = source.tryAdvance(this);
        this.action = null;
        return hasNext;
    }

    private void doInit() {
        int prefixState = state;
        if (prefixState != STATE_NONE)
            return;
        if (prefix != null) {
            prefix.doInit();
            prefixState = prefix.state;
        }
        if (prefixState == STATE_FIRST_READ || prefixState == STATE_INIT) {
            first = prefix.first;
            state = STATE_INIT;
            return;
        }
        state = source.tryAdvance(x -> first = x) ? STATE_FIRST_READ : STATE_EMPTY;
    }

    @Override
    public void forEachRemaining(Consumer<? super R> action) {
        acquire();
        int myState = state;
        this.action = action;
        if (myState == STATE_FIRST_READ || myState == STATE_INIT) {
            release();
            if (myState == STATE_FIRST_READ) {
                state = STATE_INIT;
                accept(first);
            }
            source.forEachRemaining(this);
            this.action = null;
            return;
        }
        try {
            Consumer<T> init = x -> {
                if (state == STATE_NONE) {
                    if (prefix != null) {
                        prefix.doInit();
                    }
                    this.first = (prefix == null || prefix.state == STATE_EMPTY) ? x : prefix.first;
                    state = STATE_INIT;
                }
                release();
            };
            source.forEachRemaining(init.andThen(this));
            this.action = null;
        } finally {
            release();
        }
    }

    @Override
    public Spliterator<R> trySplit() {
        if (state != STATE_NONE)
            return null;
        Spliterator<T> prefix;
        if (lock == null)
            lock = new ReentrantLock();
        acquire();
        try {
            if (state != STATE_NONE)
                return null;
            prefix = source.trySplit();
            if (prefix == null)
                return null;
            WithFirstSpliterator<T, R> result = doClone();
            result.source = prefix;
            return this.prefix = result;
        } finally {
            release();
        }
    }

    @Override
    public long estimateSize() {
        return source.estimateSize();
    }

    @Override
    public int characteristics() {
        return NONNULL
            | (source.characteristics() & (DISTINCT | IMMUTABLE | CONCURRENT | ORDERED | (lock == null ? SIZED : 0)));
    }

    @Override
    public void accept(T x) {
        action.accept(mapper.apply(first, x));
    }
}

1	/*
2	* Copyright 2015, 2019 StreamEx contributors
3	*
4	* Licensed under the Apache License, Version 2.0 (the "License");
5	* you may not use this file except in compliance with the License.
6	* You may obtain a copy of the License at
7	*
8	* http://www.apache.org/licenses/LICENSE-2.0
9	*
10	* Unless required by applicable law or agreed to in writing, software
11	* distributed under the License is distributed on an "AS IS" BASIS,
12	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13	* See the License for the specific language governing permissions and
14	* limitations under the License.
15	*/
16	package one.util.streamex;
17
18	import java.util.Spliterator;
19	import java.util.concurrent.locks.ReentrantLock;
20	import java.util.function.BiFunction;
21	import java.util.function.Consumer;
22
23	import one.util.streamex.Internals.CloneableSpliterator;
24
25	/**
26	* @author Tagir Valeev
27	*/
28	/* package */final class WithFirstSpliterator<T, R> extends CloneableSpliterator<R, WithFirstSpliterator<T, R>> implements Consumer<T> {
29	private static final int STATE_NONE = 0;
30	private static final int STATE_FIRST_READ = 1;
31	private static final int STATE_INIT = 2;
32	private static final int STATE_EMPTY = 3;
33
34	private ReentrantLock lock;
35	private Spliterator<T> source;
36	private WithFirstSpliterator<T, R> prefix;
37	private volatile T first;
38	private volatile int state = STATE_NONE;	1✔
39	private final BiFunction<? super T, ? super T, ? extends R> mapper;
40	private Consumer<? super R> action;
41
42	WithFirstSpliterator(Spliterator<T> source, BiFunction<? super T, ? super T, ? extends R> mapper) {	1✔
43	this.source = source;	1✔
44	this.mapper = mapper;	1✔
45	}	1✔
46
47	private void acquire() {
48	if (lock != null && state == STATE_NONE) {	1✔
49	lock.lock();	1✔
50	}
51	}	1✔
52
53	private void release() {
54	if (lock != null && lock.isHeldByCurrentThread()) {	1✔
55	lock.unlock();	1✔
56	}
57	}	1✔
58
59	@Override
60	public boolean tryAdvance(Consumer<? super R> action) {
61	if (state == STATE_NONE) {	1✔
62	acquire();	1✔
63	try {
64	doInit();	1✔
65	} finally {
66	release();	1✔
67	}
68	}
69	if (state == STATE_FIRST_READ) {	1✔
70	state = STATE_INIT;	1✔
71	action.accept(mapper.apply(first, first));	1✔
72	return true;	1✔
73	}
74	if (state != STATE_INIT)	1✔
75	return false;	1✔
76	this.action = action;	1✔
77	boolean hasNext = source.tryAdvance(this);	1✔
78	this.action = null;	1✔
79	return hasNext;	1✔
80	}
81
82	private void doInit() {
83	int prefixState = state;	1✔
84	if (prefixState != STATE_NONE)	1✔
85	return;	1✔
86	if (prefix != null) {	1✔
87	prefix.doInit();	1✔
88	prefixState = prefix.state;	1✔
89	}
90	if (prefixState == STATE_FIRST_READ \|\| prefixState == STATE_INIT) {	1✔
91	first = prefix.first;	1✔
92	state = STATE_INIT;	1✔
93	return;	1✔
94	}
95	state = source.tryAdvance(x -> first = x) ? STATE_FIRST_READ : STATE_EMPTY;	1✔
96	}	1✔
97
98	@Override
99	public void forEachRemaining(Consumer<? super R> action) {
100	acquire();	1✔
101	int myState = state;	1✔
102	this.action = action;	1✔
103	if (myState == STATE_FIRST_READ \|\| myState == STATE_INIT) {	1✔
104	release();	1✔
105	if (myState == STATE_FIRST_READ) {	1✔
106	state = STATE_INIT;	1✔
107	accept(first);	1✔
108	}
109	source.forEachRemaining(this);	1✔
110	this.action = null;	1✔
111	return;	1✔
112	}
113	try {
114	Consumer<T> init = x -> {	1✔
115	if (state == STATE_NONE) {	1✔
116	if (prefix != null) {	1✔
117	prefix.doInit();	1✔
118	}
119	this.first = (prefix == null \|\| prefix.state == STATE_EMPTY) ? x : prefix.first;	1✔
120	state = STATE_INIT;	1✔
121	}
122	release();	1✔
123	};	1✔
124	source.forEachRemaining(init.andThen(this));	1✔
125	this.action = null;	1✔
126	} finally {
127	release();	1✔
128	}
129	}	1✔
130
131	@Override
132	public Spliterator<R> trySplit() {
133	if (state != STATE_NONE)	1✔
134	return null;	1✔
135	Spliterator<T> prefix;
136	if (lock == null)	1✔
137	lock = new ReentrantLock();	1✔
138	acquire();	1✔
139	try {
140	if (state != STATE_NONE)	1✔
141	return null;	×
142	prefix = source.trySplit();	1✔
143	if (prefix == null)	1✔
144	return null;	1✔
145	WithFirstSpliterator<T, R> result = doClone();	1✔
146	result.source = prefix;	1✔
147	return this.prefix = result;	1✔
148	} finally {
149	release();	1✔
150	}
151	}
152
153	@Override
154	public long estimateSize() {
155	return source.estimateSize();	1✔
156	}
157
158	@Override
159	public int characteristics() {
160	return NONNULL	1✔
161	\| (source.characteristics() & (DISTINCT \| IMMUTABLE \| CONCURRENT \| ORDERED \| (lock == null ? SIZED : 0)));	1✔
162	}
163
164	@Override
165	public void accept(T x) {
166	action.accept(mapper.apply(first, x));	1✔
167	}	1✔
168	}

amaembo / streamex / #667

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