/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.script.mustache;
import com.github.mustachejava.reflect.ReflectionObjectHandler;
import org.elasticsearch.common.util.iterable.Iterables;
import java.lang.reflect.Array;
import java.util.AbstractMap;
import java.util.Collection;
import java.util.Set;
import java.util.Iterator;
import java.util.Map;
import java.util.HashMap;
final class CustomReflectionObjectHandler extends ReflectionObjectHandler {
@Override
public Object coerce(Object object) {
if (object == null) {
return null;
}
if (object.getClass().isArray()) {
return new ArrayMap(object);
} else if (object instanceof Collection) {
@SuppressWarnings("unchecked")
Collection<Object> collection = (Collection<Object>) object;
return new CollectionMap(collection);
} else {
return super.coerce(object);
}
}
static final class ArrayMap extends AbstractMap<Object, Object> implements Iterable<Object> {
private final Object array;
private final int length;
ArrayMap(Object array) {
this.array = array;
this.length = Array.getLength(array);
}
@Override
public Object get(Object key) {
if ("size".equals(key)) {
return size();
} else if (key instanceof Number) {
return Array.get(array, ((Number) key).intValue());
}
try {
int index = Integer.parseInt(key.toString());
return Array.get(array, index);
} catch (NumberFormatException nfe) {
// if it's not a number it is as if the key doesn't exist
return null;
}
}
@Override
public boolean containsKey(Object key) {
return get(key) != null;
}
@Override
public Set<Entry<Object, Object>> entrySet() {
Map<Object, Object> map = new HashMap<>(length);
for (int i = 0; i < length; i++) {
map.put(i, Array.get(array, i));
}
return map.entrySet();
}
@Override
public Iterator<Object> iterator() {
return new Iterator<Object>() {
int index = 0;
@Override
public boolean hasNext() {
return index < length;
}
@Override
public Object next() {
return Array.get(array, index++);
}
};
}
}
static final class CollectionMap extends AbstractMap<Object, Object> implements Iterable<Object> {
private final Collection<Object> col;
CollectionMap(Collection<Object> col) {
this.col = col;
}
@Override
public Object get(Object key) {
if ("size".equals(key)) {
return col.size();
} else if (key instanceof Number) {
return Iterables.get(col, ((Number) key).intValue());
}
try {
int index = Integer.parseInt(key.toString());
return Iterables.get(col, index);
} catch (NumberFormatException nfe) {
// if it's not a number it is as if the key doesn't exist
return null;
}
}
@Override
public boolean containsKey(Object key) {
return get(key) != null;
}
@Override
public Set<Entry<Object, Object>> entrySet() {
Map<Object, Object> map = new HashMap<>(col.size());
int i = 0;
for (Object item : col) {
map.put(i++, item);
}
return map.entrySet();
}
@Override
public Iterator<Object> iterator() {
return col.iterator();
}
}
}