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package org.netbeans.html.context.impl;

import net.java.html.BrwsrCtx;
import org.netbeans.html.context.spi.Contexts.Builder;

/** Internal communication between API (e.g. {@link BrwsrCtx}), SPI
 * (e.g. {@link Builder}) and the implementation package.
 *
 * @author Jaroslav Tulach
 */
public abstract class CtxAccssr {
    private static CtxAccssr DEFAULT;
    static {
        // run initializers
        BrwsrCtx.findDefault(CtxAccssr.class);
    }
    
    protected CtxAccssr() {
        if (DEFAULT != null) throw new IllegalStateException();
        DEFAULT = this;
    }
    
    protected abstract BrwsrCtx newContext(CtxImpl impl);
    protected abstract CtxImpl find(BrwsrCtx context);
    
    static CtxAccssr getDefault() {
        return DEFAULT;
    }
}