| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.apache.logging.log4j.core.impl; |
| |
| import java.util.Arrays; |
| import java.util.Comparator; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Objects; |
| |
| import org.apache.logging.log4j.util.BiConsumer; |
| import org.apache.logging.log4j.util.ReadOnlyStringMap; |
| import org.apache.logging.log4j.util.StringMap; |
| import org.apache.logging.log4j.util.TriConsumer; |
| |
| /** |
| * Provides a read-only {@code StringMap} view of a {@code Map<String, String>}. |
| */ |
| class JdkMapAdapterStringMap implements StringMap { |
| private static final long serialVersionUID = -7348247784983193612L; |
| private static final String FROZEN = "Frozen collection cannot be modified"; |
| private static final Comparator<? super String> NULL_FIRST_COMPARATOR = new Comparator<String>() { |
| @Override |
| public int compare(final String left, final String right) { |
| if (left == null) { |
| return -1; |
| } |
| if (right == null) { |
| return 1; |
| } |
| return left.compareTo(right); |
| } |
| }; |
| |
| private final Map<String, String> map; |
| private boolean immutable = false; |
| private transient String[] sortedKeys; |
| |
| public JdkMapAdapterStringMap() { |
| this(new HashMap<String, String>()); |
| } |
| |
| public JdkMapAdapterStringMap(final Map<String, String> map) { |
| this.map = Objects.requireNonNull(map, "map"); |
| } |
| |
| @Override |
| public Map<String, String> toMap() { |
| return map; |
| } |
| |
| private void assertNotFrozen() { |
| if (immutable) { |
| throw new UnsupportedOperationException(FROZEN); |
| } |
| } |
| |
| @Override |
| public boolean containsKey(final String key) { |
| return map.containsKey(key); |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public <V> void forEach(final BiConsumer<String, ? super V> action) { |
| final String[] keys = getSortedKeys(); |
| for (int i = 0; i < keys.length; i++) { |
| action.accept(keys[i], (V) map.get(keys[i])); |
| } |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public <V, S> void forEach(final TriConsumer<String, ? super V, S> action, final S state) { |
| final String[] keys = getSortedKeys(); |
| for (int i = 0; i < keys.length; i++) { |
| action.accept(keys[i], (V) map.get(keys[i]), state); |
| } |
| } |
| |
| private String[] getSortedKeys() { |
| if (sortedKeys == null) { |
| sortedKeys = map.keySet().toArray(new String[map.size()]); |
| Arrays.sort(sortedKeys, NULL_FIRST_COMPARATOR); |
| } |
| return sortedKeys; |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public <V> V getValue(final String key) { |
| return (V) map.get(key); |
| } |
| |
| @Override |
| public boolean isEmpty() { |
| return map.isEmpty(); |
| } |
| |
| @Override |
| public int size() { |
| return map.size(); |
| } |
| |
| @Override |
| public void clear() { |
| if (map.isEmpty()) { |
| return; |
| } |
| assertNotFrozen(); |
| map.clear(); |
| sortedKeys = null; |
| } |
| |
| @Override |
| public void freeze() { |
| immutable = true; |
| } |
| |
| @Override |
| public boolean isFrozen() { |
| return immutable; |
| } |
| |
| @Override |
| public void putAll(final ReadOnlyStringMap source) { |
| assertNotFrozen(); |
| source.forEach(PUT_ALL, map); |
| sortedKeys = null; |
| } |
| |
| private static TriConsumer<String, String, Map<String, String>> PUT_ALL = new TriConsumer<String, String, Map<String, String>>() { |
| @Override |
| public void accept(final String key, final String value, final Map<String, String> stringStringMap) { |
| stringStringMap.put(key, value); |
| } |
| }; |
| |
| @Override |
| public void putValue(final String key, final Object value) { |
| assertNotFrozen(); |
| map.put(key, value == null ? null : String.valueOf(value)); |
| sortedKeys = null; |
| } |
| |
| @Override |
| public void remove(final String key) { |
| if (!map.containsKey(key)) { |
| return; |
| } |
| assertNotFrozen(); |
| map.remove(key); |
| sortedKeys = null; |
| } |
| |
| @Override |
| public String toString() { |
| final StringBuilder result = new StringBuilder(map.size() * 13); |
| result.append('{'); |
| final String[] keys = getSortedKeys(); |
| for (int i = 0; i < keys.length; i++) { |
| if (i > 0) { |
| result.append(", "); |
| } |
| result.append(keys[i]).append('=').append(map.get(keys[i])); |
| } |
| result.append('}'); |
| return result.toString(); |
| } |
| |
| @Override |
| public boolean equals(final Object object) { |
| if (object == this) { |
| return true; |
| } |
| if (!(object instanceof JdkMapAdapterStringMap)) { |
| return false; |
| } |
| final JdkMapAdapterStringMap other = (JdkMapAdapterStringMap) object; |
| return map.equals(other.map) && immutable == other.immutable; |
| } |
| |
| @Override |
| public int hashCode() { |
| return map.hashCode() + (immutable ? 31 : 0); |
| } |
| } |