org.apache.hadoop.hive.common.StringableMap Maven / Gradle / Ivy
/**
* 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.hadoop.hive.common;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
/**
* A utility class that can convert a HashMap of Properties into a colon separated string,
* and can take the same format of string and convert it to a HashMap of Properties.
*/
public class StringableMap extends HashMap {
public StringableMap(String s) {
String[] parts = s.split(":", 2);
// read that many chars
int numElements = Integer.parseInt(parts[0]);
s = parts[1];
for (int i = 0; i < numElements; i++) {
parts = s.split(":", 2);
int len = Integer.parseInt(parts[0]);
String key = null;
if (len > 0) key = parts[1].substring(0, len);
parts = parts[1].substring(len).split(":", 2);
len = Integer.parseInt(parts[0]);
String value = null;
if (len > 0) value = parts[1].substring(0, len);
s = parts[1].substring(len);
put(key, value);
}
}
public StringableMap(Map m) {
super(m);
}
@Override
public String toString() {
StringBuilder buf = new StringBuilder();
buf.append(size());
buf.append(':');
if (size() > 0) {
for (Map.Entry entry : entrySet()) {
int length = (entry.getKey() == null) ? 0 : entry.getKey().length();
buf.append(entry.getKey() == null ? 0 : length);
buf.append(':');
if (length > 0) buf.append(entry.getKey());
length = (entry.getValue() == null) ? 0 : entry.getValue().length();
buf.append(length);
buf.append(':');
if (length > 0) buf.append(entry.getValue());
}
}
return buf.toString();
}
public Properties toProperties() {
Properties props = new Properties();
props.putAll(this);
return props;
}
}