SquirrelJME/SquirrelJME

// -*- Mode: Java; indent-tabs-mode: t; tab-width: 4 -*-
// ---------------------------------------------------------------------------
// SquirrelJME
//     Copyright (C) Stephanie Gawroriski <xer@multiphasicapps.net>
// ---------------------------------------------------------------------------
// SquirrelJME is under the Mozilla Public License Version 2.0.
// See license.mkd for licensing and copyright information.
// ---------------------------------------------------------------------------

package cc.squirreljme.jvm.suite;

import cc.squirreljme.jvm.manifest.JavaManifest;
import cc.squirreljme.jvm.manifest.JavaManifestAttributes;
import java.lang.ref.Reference;
import java.lang.ref.WeakReference;
import java.util.Objects;

/**
 * This contains all the information which is provided by a suite.
 *
 * @since 2017/11/30
 */
public final class SuiteInfo
{
    /** The manifest for this suite. */
    protected final JavaManifest manifest;
    
    /** The type of suite this is. */
    protected final SuiteType type;
    
    /** The suite name. */
    protected final SuiteName name;
    
    /** The suite vendor. */
    protected final SuiteVendor vendor;
    
    /** The suite version. */
    protected final SuiteVersion version;
    
    /** Required dependency information. */
    private Reference<DependencyInfo> _dependencies;
    
    /** Provided dependency information. */
    private Reference<ProvidedInfo> _provided;
    
    /** Suite cache. */
    private Reference<SuiteIdentifier> _suite;
    
    /**
     * Initializes the suite information.
     *
     * @param __man The manifest making up the suite information.
     * @throws InvalidSuiteException If the suite information is not correct.
     * @throws NullPointerException On null arguments.
     * @since 2017/12/04
     */
    public SuiteInfo(JavaManifest __man)
        throws InvalidSuiteException, NullPointerException
    {
        if (__man == null)
            throw new NullPointerException("NARG");
        
        this.manifest = __man;
        JavaManifestAttributes attr = __man.getMainAttributes();
        
        // First determine the type
        SuiteType type = SuiteType.ofManifest(__man);
        this.type = type;
        
        /* {@squirreljme.error DG0b No suite name was specified.} */
        SuiteName name = new SuiteName(
            Objects.<String>requireNonNull(attr.getValue(type.nameKey()),
            "AR0b"));
        this.name = name;
        
        /* {@squirreljme.error DG0c No suite vendor was specified.} */
        SuiteVendor vendor = new SuiteVendor(
            Objects.<String>requireNonNull(attr.getValue(type.vendorKey()),
            "AR0c"));
        this.vendor = vendor;
        
        /* {@squirreljme.error DG0d No suite version was specified.} */
        SuiteVersion version = new SuiteVersion(
            Objects.<String>requireNonNull(attr.getValue(type.versionKey()),
            "AR0d"));
        this.version = version;
    }
    
    /**
     * Return the dependencies which are required by this suite.
     *
     * @return The dependencies required by this suite.
     * @since 2017/12/04
     */
    public final DependencyInfo dependencies()
    {
        Reference<DependencyInfo> ref = this._dependencies;
        DependencyInfo rv;
        
        if (ref == null || null == (rv = ref.get()))
            this._dependencies = new WeakReference<>(
                (rv = DependencyInfo.of(this)));
        
        return rv;
    }
    
    /**
     * Returns the manifest used for this suite.
     *
     * @return The manifest suite.
     * @since 2017/12/05
     */
    public final JavaManifest manifest()
    {
        return this.manifest;
    }
    
    /**
     * Returns the suite name.
     *
     * @return The name.
     * @since 2017/12/31
     */
    public final SuiteName name()
    {
        return this.name;
    }
    
    /**
     * Returns the dependencies provided by this suite.
     *
     * @return The provided dependencies for this suite.
     * @since 2017/12/04
     */
    public final ProvidedInfo provided()
    {
        Reference<ProvidedInfo> ref = this._provided;
        ProvidedInfo rv;
        
        if (ref == null || null == (rv = ref.get()))
            this._provided = new WeakReference<>(
                (rv = ProvidedInfo.of(this)));
        
        return rv;
    }
    
    /**
     * Returns the suite for this.
     *
     * @return The suite.
     * @since 2017/12/05
     */
    public final SuiteIdentifier suite()
    {
        Reference<SuiteIdentifier> ref = this._suite;
        SuiteIdentifier rv;
        
        if (ref == null || null == (rv = ref.get()))
            this._suite = new WeakReference<>((rv = new SuiteIdentifier(
                this.name, this.vendor, this.version)));
        
        return rv;
    }
    
    /**
     * Returns the type of suite this is.
     *
     * @return The type of suite.
     * @since 2017/12/04
     */
    public final SuiteType type()
    {
        return this.type;
    }
    
    /**
     * Returns the suite vendor.
     *
     * @return The vendor.
     * @since 2017/12/31
     */
    public final SuiteVendor vendor()
    {
        return this.vendor;
    }
    
    /**
     * Returns the suite version.
     *
     * @return The version.
     * @since 2017/12/31
     */
    public final SuiteVersion version()
    {
        return this.version;
    }
}