Library.java

package net.minecraftforge.gradle.util.json.version;

import java.util.List;
import java.util.Map;

import net.minecraftforge.gradle.common.Constants;

public class Library
{
    public String name;
    public List<OSRule> rules;
    public Map<OS, String> natives;
    public ExtractRule extract;
    private String url;
    
    private Action _applies = null;
    public boolean applies()
    {
        if (_applies == null)
        {
            _applies = Action.DISALLOW;
            if (rules == null)
            {
                _applies = Action.ALLOW;
            }
            else
            {
                for (OSRule rule : rules)
                {
                    if (rule.applies())
                        _applies = rule.action;
                }
            }
        }
        return _applies == Action.ALLOW;
    }

    private Artifact _artifact = null;
    public String getPath()
    {
        if (_artifact == null)
        {
            _artifact = new Artifact(name);
        }
        return _artifact.getPath();
    }

    public String getPathNatives()
    {
        if (natives == null) return null;
        if (_artifact == null)
        {
            _artifact = new Artifact(name);
        }
        return _artifact.getPath(natives.get(OS.CURRENT));
    }
    
    public String getArtifactName()
    {
        if (_artifact == null)
            _artifact = new Artifact(name);
        
        if (natives == null)
            return _artifact.getArtifact();
        else
            return _artifact.getArtifact(natives.get(OS.CURRENT));
    }

    public String getUrl()
    {
        return url == null ? Constants.URL_LIBRARY : url; 
    }

    @Override
    public String toString()
    {
        return name;
    }

    private class Artifact
    {
        private String domain;
        private String name;
        private String version;
        private String classifier;
        private String ext = "jar";

        public Artifact(String rep)
        {
            String[] pts = rep.split(":");
            int idx = pts[pts.length-1].indexOf('@');
            if (idx != -1)
            {
                ext = pts[pts.length-1].substring(idx + 1);
                pts[pts.length-1] = pts[pts.length-1].substring(0, idx);
            }
            domain  = pts[0];
            name    = pts[1];
            version = pts[2];
            if (pts.length > 3) classifier = pts[3];
        }

        public String getArtifact(){ return getArtifact(classifier); }
        public String getArtifact(String classifier)
        {
            String ret = domain + ":" + name + ":" + version;
            if (classifier != null && classifier.indexOf('$') > -1)
            {
                classifier = classifier.replace("${arch}", Constants.SYSTEM_ARCH.toString());
            }
            if (classifier != null) ret += ":" + classifier;
            if (!"jar".equals(ext)) ret += "@" + ext;
            return ret;
        }
        
        public String getPath(){ return getPath(classifier); }
        public String getPath(String classifier)
        {
            String ret = String.format("%s/%s/%s/%s-%s", domain.replace('.', '/'), name, version, name, version);
            if (classifier != null && classifier.indexOf('$') > -1)
            {
                classifier = classifier.replace("${arch}", Constants.SYSTEM_ARCH.toString());
            }
            if (classifier != null) ret += "-" + classifier;
            return ret + "." + ext;
        }
    }
}