com.googlecode.goclipse.tooling.oracle.JSONParseHelpers.java Source code

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/*******************************************************************************
 * Copyright (c) 2015, 2015 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Bruno Medeiros - initial API and implementation
 *******************************************************************************/
package com.googlecode.goclipse.tooling.oracle;

import melnorme.utilbox.core.CommonException;
import melnorme.utilbox.misc.NumberUtil;

import org.json.JSONException;
import org.json.JSONObject;

public class JSONParseHelpers {

    public JSONParseHelpers() {
        super();
    }

    public static String readOptionalString(JSONObject jsonObject, String key)
            throws JSONException, CommonException {
        if (!jsonObject.has(key)) {
            return null;
        }
        return readString(jsonObject, key);
    }

    public static String readString(JSONObject jsonObject, String key) throws JSONException, CommonException {
        Object stringValue = jsonObject.get(key);
        if (stringValue instanceof String) {
            return (String) stringValue;
        } else {
            throw new CommonException("Member " + key + " not a String.");
        }
    }

    public static int parsePositiveInt(String optString) throws CommonException {
        int integer = NumberUtil.parseInt(optString);
        if (integer < 0) {
            throw new CommonException("Integer is not positive: " + optString);
        }
        return integer;
    }

}