com.google.inject.internal.AbstractProcessor Maven / Gradle / Ivy

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package com.google.inject.internal;

import com.google.inject.spi.DefaultElementVisitor;
import com.google.inject.spi.Element;

import java.util.Iterator;
import java.util.List;

/**
 * Abstract base class for creating an injector from module elements.
 *
 * Extending classes must return {@code true} from any overridden
 * {@code visit*()} methods, in order for the element processor to remove the
 * handled element.
 *
 */
abstract class AbstractProcessor extends DefaultElementVisitor {

    protected Errors errors;
    protected InjectorImpl injector;

    protected AbstractProcessor(Errors errors) {
        this.errors = errors;
    }

    public void process(Iterable isolatedInjectorBuilders) {
        for (InjectorShell injectorShell : isolatedInjectorBuilders) {
            process(injectorShell.getInjector(), injectorShell.getElements());
        }
    }

    public void process(InjectorImpl injector, List elements) {
        Errors errorsAnyElement = this.errors;
        this.injector = injector;
        try {
            for (Iterator i = elements.iterator(); i.hasNext(); ) {
                Element element = i.next();
                this.errors = errorsAnyElement.withSource(element.getSource());
                Boolean allDone = element.acceptVisitor(this);
                if (allDone) {
                    i.remove();
                }
            }
        } finally {
            this.errors = errorsAnyElement;
            this.injector = null;
        }
    }

    @Override
    protected Boolean visitOther(Element element) {
        return false;
    }
}