com.crossedstreams.desktop.website.JsonParser.java Source code

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Here is the source code for com.crossedstreams.desktop.website.JsonParser.java

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/**
   Copyright 2013 Paul J Brabban
    
   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 com.crossedstreams.desktop.website;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.IOException;
import java.io.Reader;
import java.net.URI;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

/**
 * Parse website definitions from Json format
 *
 * @author Paul Brabban <paul dot brabban at gmail dot com>
 */
public class JsonParser {

    /**
     * Parse JSON formatted input.
     * 
     * @param from JSON formatted data as a reader stream
     * @return collection build from incoming data
     * @throws IOException if the attempt to read the input fails
     */
    public Collection<UrlGroup> parseUrlGroups(Reader from) throws IOException {
        ObjectMapper jsonObjectMapper = new ObjectMapper();
        JsonNode rootNode = jsonObjectMapper.readTree(from);

        List<UrlGroup> urlGroups = new ArrayList<UrlGroup>();
        if (!rootNode.isArray())
            throw new IllegalArgumentException("Invalid input, root node should be an array of groups");
        for (JsonNode groupJson : rootNode) {
            urlGroups.add(buildGroup(groupJson));
        }
        return urlGroups;
    }

    private UrlGroup buildGroup(JsonNode groupJson) {
        String label = groupJson.path("label").asText();
        UrlExpectation expectation = buildExpectation(groupJson.path("expect"), UrlExpectation.DEFAULT_EXPECTATION);
        JsonNode urls = groupJson.path("urls");
        List<UrlDefinition> defs = new ArrayList<UrlDefinition>(urls.size());
        for (JsonNode urlNode : urls) {
            defs.add(buildUrlDef(urlNode, expectation));
        }
        return new UrlGroup(label, expectation, defs);
    }

    private UrlDefinition buildUrlDef(JsonNode urlJson, UrlExpectation groupExpectation) {
        String url = urlJson.path("url").asText();
        String label = urlJson.path("label").asText();
        UrlExpectation expectation = buildExpectation(urlJson.path("expect"), groupExpectation);
        return new UrlDefinition(URI.create(url), label, expectation);
    }

    private UrlExpectation buildExpectation(JsonNode expectJson, UrlExpectation parent) {
        if (expectJson.isMissingNode())
            return parent;

        long respondsInMillis = expectJson.path("faster_than_millis").asLong(parent.getResponseInMillis());

        int statusCode = expectJson.path("status_code").asInt(parent.getResponseHttpCode());

        boolean acceptUntrusted = expectJson.path("accept_untrusted_certificate")
                .asBoolean(parent.acceptUntrustedCertificate());

        int validForDays = expectJson.path("certificate_valid_for_days").asInt(parent.getCertificateValidForDays());

        return new UrlExpectation(respondsInMillis, statusCode, acceptUntrusted, validForDays);
    }

}