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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.text;
import java.util.Map;
/**
* Static methods for working with the map textual format which is parsed by {@link MapParser}
*
* @author bratseth
*/
public final class JSON {
/** No instances */
private JSON() {}
/**
* Outputs a map as a JSON 'object' string, provided that the map values
* are either
* <ul>
* <li>String
* <li>Number
* <li>Any object whose toString returns JSON
* </ul>
*/
public static String encode(Map<String, ?> map) {
StringBuilder b = new StringBuilder("{");
for (Map.Entry<String,?> entry : map.entrySet()) {
b.append("\"").append(escape(entry.getKey())).append("\":");
if (entry.getValue() instanceof String)
b.append("\"").append(escape(entry.getValue().toString())).append("\"");
else // Number, or some other object which returns JSON
b.append(entry.getValue());
b.append(",");
}
if (b.length()>1)
b.setLength(b.length()-1); // remove last comma
b.append("}");
return b.toString();
}
/** Returns the given string as a properly json escaped string */
public static String escape(String s) {
StringBuilder b = null; // lazy create to optimize for "nothing to do" case
for (int i=0; i < s.length(); i = s.offsetByCodePoints(i, 1)) {
final int codepoint = s.codePointAt(i);
if (codepoint == '"') {
if (b == null)
b = new StringBuilder(s.substring(0, i));
b.append('\\');
}
if (b != null)
b.appendCodePoint(codepoint);
}
return b != null ? b.toString() : s;
}
}
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