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ParamProperties.java
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/
ParamProperties.java
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/*
* Copyright 2015 Red Hat, Inc. and/or its affiliates
* and other contributors as indicated by the @author tags.
*
* Licensed 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.hawkular.inventory.rest.filters;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* @author <a href="https://github.com/ppalaga">Peter Palaga</a>
*/
public class ParamProperties implements Map<String, List<String>> {
static class Parser {
private static final int INVALID = -1;
private int pos = 0;
private final Map<String, List<String>> result;
private final String input;
public Parser(String serialized) {
super();
this.input = serialized;
this.result = new LinkedHashMap<>();
}
private int consumeNext() {
if (pos < input.length()) {
int result = input.charAt(pos++);
if (result == BACKSLASH) {
if (pos < input.length()) {
result = input.charAt(pos++);
} else {
return INVALID;
}
}
return result;
}
return INVALID;
}
public Map<String, List<String>> parse() {
String key;
while (pos < input.length()) {
key = token();
String value = null;
if (pos < input.length() && input.charAt(pos) == COLON) {
pos++;
value = token();
}
put(key, value);
if (pos < input.length() && input.charAt(pos) == COMMA) {
pos++;
}
}
return Collections.unmodifiableMap(result);
}
private void put(String key, String value) {
List<String> oldList = result.get(key);
if (oldList == null) {
if (value == null) {
result.put(key, null);
} else {
List<String> newList = new ArrayList<String>(1);
newList.add(value);
result.put(key, Collections.unmodifiableList(newList));
}
} else {
/* oldList != null */
if (value == null) {
/* ignore a value-less key rather than adding
* null to the list or throwing an exception */
} else {
List<String> newList = new ArrayList<String>(oldList.size() + 1);
newList.addAll(oldList);
newList.add(value);
result.put(key, Collections.unmodifiableList(newList));
}
}
}
private String token() {
StringBuilder sb = new StringBuilder();
LOOP: while (pos < input.length()) {
int ch = input.charAt(pos);
switch (ch) {
case COLON:
case COMMA:
break LOOP;
default:
ch = consumeNext();
if (ch != INVALID) {
sb.append((char) ch);
}
break;
}
}
return sb.toString();
}
}
public static final char BACKSLASH = '\\';
public static final char COMMA = ',';
public static final char COLON = ':';
private final Map<String, List<String>> store;
public ParamProperties(String serialized) {
this.store = new Parser(serialized).parse();
}
@Override
public int size() {
return store.size();
}
@Override
public boolean isEmpty() {
return store.isEmpty();
}
@Override
public boolean containsKey(Object key) {
return store.containsKey(key);
}
@Override
public boolean containsValue(Object value) {
return store.containsValue(value);
}
@Override
public List<String> get(Object key) {
return store.get(key);
}
@Override
public List<String> put(String key, List<String> value) {
throw new UnsupportedOperationException(getClass().getName() + " is immutable");
}
@Override
public List<String> remove(Object key) {
throw new UnsupportedOperationException(getClass().getName() + " is immutable");
}
@Override
public void putAll(Map<? extends String, ? extends List<String>> m) {
throw new UnsupportedOperationException(getClass().getName() + " is immutable");
}
@Override
public void clear() {
throw new UnsupportedOperationException(getClass().getName() + " is immutable");
}
@Override
public Set<String> keySet() {
return store.keySet();
}
@Override
public Collection<List<String>> values() {
return store.values();
}
@Override
public Set<java.util.Map.Entry<String, List<String>>> entrySet() {
return store.entrySet();
}
@Override
public boolean equals(Object o) {
return store.equals(o);
}
@Override
public int hashCode() {
return store.hashCode();
}
}