com.maltera.technologic.maven.mcforge.detect.CentralHashDetector.java Source code

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Here is the source code for com.maltera.technologic.maven.mcforge.detect.CentralHashDetector.java

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/* --------- BEGIN COPYRIGHT NOTICE ---------
 * Copyright 2013 Technologic contributors
 * 
 * This file is part of the Minecraft Forge Maven Plugin.
 * 
 * The Minecraft Forge Maven Plugin is free software: you can
 * redistribute it and/or modify it under the terms of the GNU
 * Lesser General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option)
 * any later version.
 * 
 * The Minecraft Forge Maven Plugin 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 Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with the Minecraft Forge Maven Plugin.  If not, see
 * <http://www.gnu.org/licenses/>.
 * ---------- END COPYRIGHT NOTICE ----------
 */
package com.maltera.technologic.maven.mcforge.detect;

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;

import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;
import org.sonatype.aether.util.artifact.DefaultArtifact;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

/** Queries Maven Central for the artifact matching the given hash.
 * If the hash matches a sub-artifact (sources, for example) its parent
 * artifact will be returned instead. This is an unfortunate limitation of
 * Central's search infrastructure.
 */
public class CentralHashDetector implements Detector {
    private final ObjectMapper jackson = new ObjectMapper();

    public void detect(Target target) throws MojoFailureException, MojoExecutionException {
        try {
            final URL url = new URL("http://search.maven.org/solrsearch/select" + "?q=1:\"" + target.getHash()
                    + "\"&rows=1&wt=json");
            final HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.connect();

            if (200 != conn.getResponseCode()) {
                throw new MojoFailureException("error querying Nexus on Maven Central: " + conn.getResponseCode()
                        + " " + conn.getResponseMessage());
            }

            final JsonNode result = jackson.readTree(conn.getInputStream());
            final JsonNode artifact = result.path("response").path("docs").path(0);

            if (!artifact.isMissingNode()) {
                target.foundArtifact(
                        new DefaultArtifact(artifact.path("g").textValue(), artifact.path("a").textValue(),
                                artifact.path("p").textValue(), artifact.path("v").textValue()),
                        "central");
            }
        } catch (IOException caught) {
            throw new MojoFailureException("error searching Maven Central", caught);
        }
    }
}