/*
* 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.jackrabbit.oak.plugins.index.old.mk.json.fast;
import org.apache.jackrabbit.mk.json.JsopBuilder;
import org.apache.jackrabbit.mk.json.JsopTokenizer;
import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;
/**
* A map.
*
* This implementation supports an options 'lengthIndex' to speed up
* sparse parsing of an object (only the requested values are parsed). The
* speedup depends on the use case.
*/
public class JsopObject extends Jsop implements Map<String, Object> {
private static final String LENGTHS_KEY = ":lengths:";
private static final HashMap<String, String> EMPTY_MAP = new HashMap<String, String>();
private HashMap<String, String> map;
private JsopTokenizer tokenizer;
private boolean lengthIndex;
private int[] length;
JsopObject(String jsop, int start, int end) {
super(jsop, start, end);
}
public JsopObject() {
super(null, 0, 0);
map = new LinkedHashMap<String, String>();
}
private void init() {
if (map != null) {
return;
}
tokenizer = new JsopTokenizer(jsop, start);
tokenizer.read('{');
if (tokenizer.matches('}')) {
map = EMPTY_MAP;
tokenizer = null;
} else {
map = new LinkedHashMap<String, String>();
}
}
@Override
public Object get(Object key) {
init();
String v = map.get(key);
if (tokenizer == null) {
return v == null ? null : Jsop.parse(v);
}
if (v == null) {
while (tokenizer != null) {
String k = tokenizer.readString();
if (lengthIndex) {
int len = length[map.size()];
int p = tokenizer.getPos();
v = jsop.substring(p, p + len);
tokenizer.setPos(p + len);
tokenizer.read();
} else {
tokenizer.read(':');
v = tokenizer.readRawValue();
}
if (LENGTHS_KEY.equals(k)) {
v = JsopTokenizer.decodeQuoted(v);
String[] lengthsStrings = v.split(",");
length = new int[lengthsStrings.length];
for (int i = 0; i < lengthsStrings.length; i++) {
length[i] = Integer.parseInt(lengthsStrings[i]);
}
lengthIndex = true;
} else {
map.put(k, v);
}
if (tokenizer.matches('}')) {
tokenizer = null;
} else {
tokenizer.read(',');
}
if (k.equals(key)) {
return Jsop.parse(v);
}
}
}
return null;
}
@Override
public boolean containsKey(Object key) {
get(key);
return map.containsKey(key);
}
@Override
public boolean isEmpty() {
init();
return map == EMPTY_MAP;
}
@Override
public int size() {
readAll();
return map.size();
}
private void readAll() {
get(null);
}
private void initWrite() {
readAll();
jsop = null;
}
@Override
public String toString() {
if (jsop == null) {
JsopBuilder w = new JsopBuilder();
w.object();
if (lengthIndex) {
if (map.containsKey(LENGTHS_KEY)) {
throw new IllegalStateException("Object already contains the key " + LENGTHS_KEY);
}
StringBuilder buff = new StringBuilder();
for (Entry<String, String> e : map.entrySet()) {
if (buff.length() > 0) {
buff.append(',');
}
buff.append(e.getValue().length());
}
w.key(LENGTHS_KEY).value(buff.toString());
}
for (Entry<String, String> e : map.entrySet()) {
w.key(e.getKey()).encodedValue(e.getValue());
}
w.endObject();
jsop = w.toString();
start = 0;
}
return jsop.substring(start);
}
@Override
public void clear() {
initWrite();
map.clear();
}
@Override
public Object put(String key, Object value) {
initWrite();
String old = map.put(key, toString(value));
return Jsop.parse(old);
}
@Override
public boolean containsValue(Object value) {
throw new UnsupportedOperationException();
}
@Override
public Set<Entry<String, Object>> entrySet() {
throw new UnsupportedOperationException();
}
@Override
public Set<String> keySet() {
throw new UnsupportedOperationException();
}
@Override
public void putAll(Map<? extends String, ?> m) {
throw new UnsupportedOperationException();
}
@Override
public Object remove(Object key) {
throw new UnsupportedOperationException();
}
@Override
public Collection<Object> values() {
throw new UnsupportedOperationException();
}
public void setLengthIndex(boolean lengthIndex) {
this.lengthIndex = lengthIndex;
}
}