DefaultHttpJsonResponse.java

/*******************************************************************************
 * Copyright (c) 2012-2017 Codenvy, S.A.
 * 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:
 *   Codenvy, S.A. - initial API and implementation
 *******************************************************************************/
package org.eclipse.che.api.core.rest;

import java.io.IOException;
import java.lang.reflect.Type;
import java.util.List;
import java.util.Map;

import org.eclipse.che.commons.json.JsonHelper;
import org.eclipse.che.commons.json.JsonParseException;
import org.eclipse.che.dto.server.DtoFactory;

import com.google.gson.reflect.TypeToken;

import static java.util.Objects.requireNonNull;

/**
 * Default implementation of {@link HttpJsonResponse}.
 * 
 * @author Yevhenii Voevodin
 */
public class DefaultHttpJsonResponse implements HttpJsonResponse {

    private static final Type STRING_MAP_TYPE = new TypeToken<Map<String, String>>() {}.getType();

    private final String responseBody;
    private final int responseCode;

    protected DefaultHttpJsonResponse(String response, int responseCode) {
        this.responseBody = response;
        this.responseCode = responseCode;
    }

    @Override
    public String asString() {
        return responseBody;
    }

    @Override
    public <T> T asDto(Class<T> dtoInterface) {
        requireNonNull(dtoInterface, "Required non-null dto interface");
        return DtoFactory.getInstance().createDtoFromJson(responseBody, dtoInterface);
    }

    @Override
    public <T> List<T> asList(Class<T> dtoInterface) {
        requireNonNull(dtoInterface, "Required non-null dto interface");
        return DtoFactory.getInstance().createListDtoFromJson(responseBody, dtoInterface);
    }

    @Override
    @SuppressWarnings("unchecked")
    public Map<String, String> asProperties() throws IOException {
        return as(Map.class, STRING_MAP_TYPE);
    }

    @Override
    public <T> T as(Class<T> clazz, Type genericType) throws IOException {
        requireNonNull(clazz, "Required non-null class");
        try {
            return JsonHelper.fromJson(responseBody, clazz, genericType);
        } catch (JsonParseException jsonEx) {
            throw new IOException(jsonEx.getLocalizedMessage(), jsonEx);
        }
    }

    @Override
    public int getResponseCode() {
        return responseCode;
    }
}