Mega Code Archive
Format a Map
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/*
* Created on Jan 25, 2008
*
* 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.
*
* Copyright @2008 the original author or authors.
*/
//package org.fest.util;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
/**
* Understands utility methods related to maps.
*
* @author Yvonne Wang
* @author Alex Ruiz
*/
public class Maps {
/**
* Returns <code>true</code> if the given map is <code>null</code> or empty.
* @param map the map to check.
* @return <code>true</code> if the given map is <code>null</code> or empty, otherwise <code>false</code>.
*/
public static boolean isEmpty(Map<?, ?> map) {
return map == null || map.isEmpty();
}
/**
* Returns the <code>String</code> representation of the given map, or <code>null</code> if the given map is
* <code>null</code>.
* @param map the map to format.
* @return the <code>String</code> representation of the given map.
*/
public static String format(Map<?, ?> map) {
if (map == null) return null;
Iterator<?> i = map.entrySet().iterator();
if (!i.hasNext()) return "{}";
StringBuilder b = new StringBuilder();
b.append("{");
for (;;) {
Entry<?, ?> e = (Entry<?, ?>)i.next();
b.append(format(map, e.getKey()));
b.append('=');
b.append(format(map, e.getValue()));
if (!i.hasNext()) return b.append("}").toString();
b.append(", ");
}
}
private static Object format(Map<?, ?> map, Object o) {
return o == map ? "(this Map)" : "\" "+ o+"\" ";
}
private Maps() {}
}
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