org.glassfish.json.JsonUtil Maven / Gradle / Ivy
/*
* Copyright (c) 2015, 2017 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package org.glassfish.json;
import java.io.StringReader;
import javax.json.Json;
import javax.json.JsonReader;
import javax.json.JsonValue;
import javax.json.stream.JsonParsingException;
/**
* A utility class
*
* @since 1.1
*/
public final class JsonUtil {
private JsonUtil() {
}
/**
* Reads the input JSON text and returns a JsonValue.
* For convenience, single quotes as well as double quotes
* are allowed to delimit JSON strings. If single quotes are
* used, any quotes, single or double, in the JSON string must be
* escaped (prepend with a '\').
*
* @param jsonString the input JSON data
* @return the object model for {@code jsonString}
* @throws JsonParsingException if the input is not legal JSON text
*/
public static JsonValue toJson(String jsonString) {
StringBuilder builder = new StringBuilder();
boolean single_context = false;
for (int i = 0; i < jsonString.length(); i++) {
char ch = jsonString.charAt(i);
if (ch == '\\') {
i = i + 1;
if (i < jsonString.length()) {
ch = jsonString.charAt(i);
if (!(single_context && ch == '\'')) {
// unescape ' inside single quotes
builder.append('\\');
}
}
} else if (ch == '\'') {
// Turn ' into ", for proper JSON string
ch = '"';
single_context = ! single_context;
}
builder.append(ch);
}
JsonReader reader = Json.createReader(
new StringReader(builder.toString()));
JsonValue value = reader.readValue();
reader.close();
return value;
}
}