/*
* 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.isis.core.runtime.services;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.SortedSet;
import com.google.common.base.Function;
import com.google.common.base.Objects;
import com.google.common.base.Splitter;
import com.google.common.collect.Iterables;
import com.google.common.collect.Iterators;
import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
class DeweyOrderUtil {
public static final <V> Function<Parsed, Map.Entry<String, V>> toMapEntry() {
return new Function<Parsed, Map.Entry<String, V>>() {
@Override
public Map.Entry<String, V> apply(Parsed input) {
return input.toMapEntry();
}
};
}
private DeweyOrderUtil() {}
static <V> List<Map.Entry<String, V>> deweySorted(Map<String, V> map) {
Set<Map.Entry<String, V>> set = Sets.newLinkedHashSet();
for (Map.Entry<String, V> entry : map.entrySet()) {
set.add(entry);
}
return deweySorted(set);
}
static <V> List<Map.Entry<String, V>> deweySorted(Set<Map.Entry<String, V>> keys) {
if(keys == null) {
throw new IllegalArgumentException("Keys cannot be null");
}
final Iterable<Parsed<V>> parsedIter = Iterables.transform(keys,
new Function<Map.Entry<String,V>, Parsed<V>>() {
@Override
public Parsed<V> apply(Map.Entry<String,V> input) {
return new Parsed(input);
}
});
final SortedSet<Parsed<V>> parseds = Sets.newTreeSet(parsedIter);
final Iterable<Map.Entry<String, V>> transform = Iterables.transform(parseds, DeweyOrderUtil.<V>toMapEntry());
return Lists.newArrayList(transform);
}
}
class Parsed<V> implements Comparable<Parsed<V>> {
private static final Function<String, Integer> PARSE = new Function<String, Integer>() {
@Override
public Integer apply(String input) {
try {
return Integer.parseInt(input);
} catch (NumberFormatException e) {
return Integer.MAX_VALUE;
}
}
};
private final List<Integer> parts;
private final String key;
private final V value;
Parsed(Map.Entry<String, V> entry) {
key = entry.getKey();
value = entry.getValue();
final Iterable<String> iter = Splitter.on(".").split(entry.getKey());
parts = Lists.newArrayList(Iterators.transform(iter.iterator(),PARSE));
}
@Override
public int compareTo(Parsed<V> other) {
for (int i = 0; i < parts.size(); i++) {
Integer p = parts.get(i);
if (other.parts.size() < parts.size()) {
// run out of parts for other, put it before us
return -1;
}
final Integer q = other.parts.get(i);
final int comparison = p.compareTo(q);
if(comparison != 0) {
return +comparison;
}
}
if(other.parts.size() > parts.size()) {
// run out of parts on our side, still more on others; put us before it
return +1;
}
return 0;
}
public Map.Entry<String, V> toMapEntry() {
return new MapEntry<String, V>(key, value){};
}
}
class MapEntry<K, V> implements Map.Entry<K, V> {
private K key;
private V value;
MapEntry(K key, V value) {
this.key = key;
this.value = value;
}
@Override
public K getKey() {
return key;
}
@Override
public V getValue() {
return value;
}
@Override
public V setValue(V value) {
throw new UnsupportedOperationException();
}
@Override public boolean equals(Object object) {
if (object instanceof Map.Entry) {
Map.Entry<?, ?> that = (Map.Entry<?, ?>) object;
return Objects.equal(this.getKey(), that.getKey())
&& Objects.equal(this.getValue(), that.getValue());
}
return false;
}
@Override public int hashCode() {
K k = getKey();
V v = getValue();
return ((k == null) ? 0 : k.hashCode()) ^ ((v == null) ? 0 : v.hashCode());
}
/**
* Returns a string representation of the form {@code {key}={value}}.
*/
@Override public String toString() {
return getKey() + "=" + getValue();
}
}