io.fabric8.kubernetes.client.utils.IOHelpers Maven / Gradle / Ivy

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/**
 * Copyright (C) 2015 Red Hat, Inc.
 *
 * 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.
 */
package io.fabric8.kubernetes.client.utils;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.StringWriter;
import java.io.Writer;
import java.nio.charset.Charset;

/**
 */
public class IOHelpers {
  private IOHelpers() {
    throw new IllegalStateException("Utility class");
  }
  
  public static String readFully(InputStream in, Charset charset) throws IOException {
    Reader r = new BufferedReader(new InputStreamReader(in, charset));
    return readFully(r);
  }
  
    public static String readFully(InputStream in) throws IOException {
      return readFully(in, Charset.defaultCharset());
    }

    public static String readFully(Reader r) throws IOException {
        try (StringWriter w = new StringWriter()) {
            copy(r, w);
            return w.toString();
        }
    }


    private static void copy(Reader reader, Writer writer) throws IOException {
        char[] buffer = new char[8192];
        int len;
        for (; ; ) {
            len = reader.read(buffer);
            if (len > 0) {
                writer.write(buffer, 0, len);
            } else {
                writer.flush();
                break;
            }
        }
    }

  public static boolean isJSONValid(String json) {
    try{
      ObjectMapper objectMapper = Serialization.jsonMapper();
      objectMapper.readTree(json);
    } catch(JsonProcessingException e){
      return false;
    }
    return true;
  }

  public static String convertYamlToJson(String yaml) throws IOException {
    ObjectMapper yamlReader = Serialization.yamlMapper();
    Object obj = yamlReader.readValue(yaml, Object.class);

    ObjectMapper jsonWriter = Serialization.jsonMapper();
    return jsonWriter.writeValueAsString(obj);
  }

  public static String convertToJson(String jsonOrYaml) throws IOException {
      if (isJSONValid(jsonOrYaml)) {
        return jsonOrYaml;
      }
      return convertYamlToJson(jsonOrYaml);
  }

}