alfresco-community-repo/source/java/org/alfresco/rest/framework/Api.java

package org.alfresco.rest.framework;

import org.alfresco.rest.framework.core.exceptions.InvalidArgumentException;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Standard API settings for the Alfresco Rest API
 * 
 * SCOPE - PUBLIC_API -  Reserved for public API
 *       - PRIVATE_API - Reserved for private API
 *
 * VERSION - A positive integer starting at 1.
 * @author Gethin James
 */
public class Api implements Comparable<Api>
{
    private static Log logger = LogFactory.getLog(Api.class);
    public enum SCOPE {PRIVATE,PUBLIC};
    
    private final String name;
    private final SCOPE scope;
    private final int version;
    
    //Minor optimization to reuse this object as it will probably be used a lot
    public static final Api ALFRESCO_PUBLIC = new Api("alfresco", SCOPE.PUBLIC, 1);
    
    /**
     * Constructor used to create an api
     * @param name
     * @param scope
     * @param version
     */
    private Api(String name, SCOPE scope, int version)
    {
        super();
        this.name = name;
        this.scope = scope;
        this.version = version;
    }

    public String getName()
    {
        return this.name;
    }

    public SCOPE getScope()
    {
        return this.scope;
    }

    public int getVersion()
    {
        return this.version;
    }

    /*
     * @see java.lang.Object#hashCode()
     */
    @Override
    public int hashCode()
    {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((this.name == null) ? 0 : this.name.hashCode());
        result = prime * result + ((this.scope == null) ? 0 : this.scope.hashCode());
        result = prime * result + this.version;
        return result;
    }

    /*
     * @see java.lang.Object#equals(java.lang.Object)
     */
    @Override
    public boolean equals(Object obj)
    {
        if (this == obj) return true;
        if (obj == null) return false;
        if (getClass() != obj.getClass()) return false;
        Api other = (Api) obj;
        if (this.name == null)
        {
            if (other.name != null) return false;
        }
        else if (!this.name.equals(other.name)) return false;
        if (this.scope != other.scope) return false;
        if (this.version != other.version) return false;
        return true;
    }

    /*
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString()
    {
        StringBuilder builder = new StringBuilder();
        builder.append("Api [name=");
        builder.append(this.name);
        builder.append(", scope=");
        builder.append(this.scope);
        builder.append(", version=");
        builder.append(this.version);
        builder.append("]");
        return builder.toString();
    }

    /**
     * Creates an valid instance of the Api object
     * @param apiName a String in lowercase
     * @param apiScope SCOPE
     * @param apiVersion postive integer
     * @return Api
     */
    public static Api valueOf(String apiName, String apiScope, String apiVersion) throws InvalidArgumentException
    {
        SCOPE scope = null;
        int version = 1;
        
        try
        {
            if (!StringUtils.isAllLowerCase(apiName)) throw new InvalidArgumentException("Api name must be lowercase");
            scope = SCOPE.valueOf(apiScope.toUpperCase());
            version = Integer.parseInt(apiVersion);
            if (version < 1) throw new InvalidArgumentException("Version must be a positive integer.");
        }
        catch (Exception error)
        {
            if (error instanceof InvalidArgumentException) throw (InvalidArgumentException)error;  //Just throw it on.
            logger.debug("Invalid API definition: "+apiName+" "+apiScope+" "+apiVersion);
            throw new InvalidArgumentException("Invalid API definition:"+error.getMessage());
        }
        
        Api anApi = new Api(apiName, scope, version);
        return ALFRESCO_PUBLIC.equals(anApi)?ALFRESCO_PUBLIC:anApi;
        
    }

    @Override
    public int compareTo(Api other)
    {
        int compare = this.scope.compareTo(other.scope);
        if (compare !=0) return compare;
   
        compare = this.name.compareTo(other.name);
        if (compare !=0) return compare;

        if (this.version < other.version) return -1;
        if (this.version > other.version) return 1;
        return 0;  // All fields are equal
    }
}