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/**
 * Copyright (c) 2008, SnakeYAML
 *
 * 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 org.yaml.snakeyaml.nodes;

import java.util.List;
import org.yaml.snakeyaml.DumperOptions;
import org.yaml.snakeyaml.error.Mark;

/**
 * Represents a sequence.
 * 
 * A sequence is a ordered collection of nodes.
 * 
 */
public class SequenceNode extends CollectionNode {

  private final List value;

  public SequenceNode(Tag tag, boolean resolved, List value, Mark startMark, Mark endMark,
      DumperOptions.FlowStyle flowStyle) {
    super(tag, startMark, endMark, flowStyle);
    if (value == null) {
      throw new NullPointerException("value in a Node is required.");
    }
    this.value = value;
    this.resolved = resolved;
  }

  public SequenceNode(Tag tag, List value, DumperOptions.FlowStyle flowStyle) {
    this(tag, true, value, null, null, flowStyle);
  }

  @Override
  public NodeId getNodeId() {
    return NodeId.sequence;
  }

  /**
   * Returns the elements in this sequence.
   *
   * @return Nodes in the specified order.
   */
  public List getValue() {
    return value;
  }

  public void setListType(Class listType) {
    for (Node node : value) {
      node.setType(listType);
    }
  }

  public String toString() {
    StringBuilder buf = new StringBuilder();
    for (Node node : getValue()) {
      if (node instanceof CollectionNode) {
        // to avoid overflow in case of recursive structures
        buf.append(System.identityHashCode(node));
      } else {
        buf.append(node.toString());
      }
      buf.append(",");
    }
    // delete last comma
    if (buf.length() > 0) {
      buf.deleteCharAt(buf.length() - 1);
    }
    return "<" + this.getClass().getName() + " (tag=" + getTag() + ", value=[" + buf + "])>";
  }
}