JsonReader.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2016 Lluis Turró Cutiller <http://www.turro.org/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
package org.turro.elephant.impl.util;
 
import com.jayway.jsonpath.DocumentContext;
import com.jayway.jsonpath.JsonPath;
import java.io.File;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import org.turro.reflection.ReflectionUtil;
 
public class JsonReader {
  
  private final File file;
  private final String json;
 
  public JsonReader(File file) {
    this.file = file;
    this.json = null;
  }
 
  public JsonReader(String json) {
    this.json = json;
    this.file = null;
  }
  
  public List list(String path) throws IOException {
    return load().read(path, java.util.List.class);
  }
  
  public Map map(String path) throws IOException {
    return load().read(path, java.util.Map.class);
  }
  
  public String read(String path) throws IOException {
    return load().read(path);
  }
  
  public Object read(String path, String javaClass) throws IOException {
    return load().read(path, ReflectionUtil.classCheck(javaClass));
  }
  
  public <T> T read(String path, Class<T> javaClass) throws IOException {
    return load().read(path, javaClass);
  }
  
  public JsonReader put(String path, String key, Object value) throws IOException {
    load().put(path, key, value);
    return this;
  }
  
  public JsonReader add(String path, Object value) throws IOException {
    load().add(path, value);
    return this;
  }
  
  /* Parser */
  
  private DocumentContext _parser;
  
  private DocumentContext load() throws IOException {
    if(_parser == null) {
      if(file != null) {
        _parser = JsonPath.parse(file);
      } else {
        _parser = JsonPath.parse(json);
      }
    }
    return _parser;
  }
  
}