com.github.simy4.xpath.effects.RemoveEffect Maven / Gradle / Ivy

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Convenient utility to build XML models by evaluating XPath expressions

There is a newer version: 2.3.9

package com.github.simy4.xpath.effects;

import com.github.simy4.xpath.XmlBuilderException;
import com.github.simy4.xpath.expr.Expr;
import com.github.simy4.xpath.navigator.Navigator;
import com.github.simy4.xpath.navigator.Node;
import com.github.simy4.xpath.view.AbstractViewVisitor;
import com.github.simy4.xpath.view.IterableNodeView;
import com.github.simy4.xpath.view.NodeView;
import com.github.simy4.xpath.view.View;
import com.github.simy4.xpath.view.ViewContext;

public class RemoveEffect implements Effect {

    private final Expr expr;

    public RemoveEffect(Expr expr) {
        this.expr = expr;
    }

    @Override
    public  void perform(Navigator navigator, N xml) throws XmlBuilderException {
        final ViewContext context = new ViewContext(navigator, new NodeView(xml), false);
        final View view = expr.resolve(context);
        view.visit(new RemoveVisitor(navigator));
    }

    private static final class RemoveVisitor extends AbstractViewVisitor {

        private final Navigator navigator;

        private RemoveVisitor(Navigator navigator) {
            this.navigator = navigator;
        }

        @Override
        public Void visit(IterableNodeView nodeSet) throws XmlBuilderException {
            for (NodeView node : nodeSet) {
                navigator.remove(node.getNode());
            }
            return null;
        }

        @Override
        protected Void returnDefault(View ignored) {
            return null;
        }

    }

}