/* * The MIT License (MIT) * * Copyright (c) 2017-2020 Yegor Bugayenko * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ package org.cactoos.map; import java.util.Collection; import java.util.Map; import java.util.Set; import org.cactoos.text.FormattedText; import org.cactoos.text.UncheckedText; /** * A decorator of {@link Map} that tolerates no NULLs. * * <p>There is no thread-safety guarantee. * * @param <K> Type of key * @param <V> Type of value * @since 0.27 */ @SuppressWarnings("PMD.TooManyMethods") public class NoNulls<K, V> implements Map<K, V> { /** * The map. */ private final Map<K, V> map; /** * Ctor. * @param origin The scalar */ public NoNulls(final Map<K, V> origin) { this.map = origin; } @Override public final int size() { return this.map.size(); } @Override public final boolean isEmpty() { return this.map.isEmpty(); } @Override public final boolean containsKey(final Object key) { if (key == null) { throw new IllegalStateException( "Key at #containsKey(K) is NULL" ); } return this.map.containsKey(key); } @Override public final boolean containsValue(final Object value) { if (value == null) { throw new IllegalStateException( "Value at #containsValue(K) is NULL" ); } return this.map.containsValue(value); } @Override public final V get(final Object key) { if (key == null) { throw new IllegalStateException( "Key at #get(K) is NULL" ); } final V value = this.map.get(key); if (value == null) { throw new IllegalStateException( new UncheckedText( new FormattedText( "Value returned by #get(%s) is NULL", key ) ).asString() ); } return value; } @Override public final V put(final K key, final V value) { if (key == null) { throw new IllegalStateException( new UncheckedText( new FormattedText( "Key at #put(K,%s) is NULL", value ) ).asString() ); } if (value == null) { throw new IllegalStateException( new UncheckedText( new FormattedText( "Value at #put(%s,V) is NULL", key ) ).asString() ); } final V result = this.map.put(key, value); if (result == null) { throw new IllegalStateException( new UncheckedText( new FormattedText( "Value returned by #put(%s,%s) is NULL", key, value ) ).asString() ); } return result; } @Override public final V remove(final Object key) { if (key == null) { throw new IllegalStateException( "Key at #remove(K) is NULL" ); } final V result = this.map.remove(key); if (result == null) { throw new IllegalStateException( new UncheckedText( new FormattedText( "Value returned by #remove(%s) is NULL", key ) ).asString() ); } return result; } @Override @SuppressWarnings("unchecked") public final void putAll(final Map<? extends K, ? extends V> items) { this.map.putAll(new NoNulls<>((Map<K, V>) items)); } @Override public final void clear() { this.map.clear(); } @Override public final Set<K> keySet() { return this.map.keySet(); } @Override public final Collection<V> values() { return new org.cactoos.collection.NoNulls<>(this.map.values()); } @Override public final Set<Map.Entry<K, V>> entrySet() { return this.map.entrySet(); } }