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Convenient utility to build XML models by evaluating XPath expressions

There is a newer version: 2.3.9

/*
 * Copyright 2017-2021 Alex Simkin
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
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.spi.Effect;
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 java.io.Serializable;

public class RemoveEffect implements Effect, Serializable {

  private static final long serialVersionUID = 1L;

  private final Expr expr;

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

  @Override
  public  void perform(Navigator navigator, N xml) throws XmlBuilderException {
    expr.resolve(navigator, new NodeView(xml), false).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 view) throws XmlBuilderException {
      throw new XmlBuilderException(
          "Failed to remove value into XML. Read-only view was resolved: " + view);
    }
  }
}