/**
 * Copyright 2008 Google Inc.
 *
 * 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.waveprotocol.wave.client.editor.content;

import org.waveprotocol.wave.model.document.util.Point;
import org.waveprotocol.wave.model.util.CollectionUtils;

import java.util.Map;

/**
 * A full, read-only content view, with singleton
 *
 * @author danilatos@google.com (Daniel Danilatos)
 */
public class FullContentView implements ContentView {
  /** Singleton, lacking a document element */
  public static final ContentView INSTANCE = new FullContentView();

  @Override
  public short getNodeType(ContentNode node) {
    return node.getNodeType();
  }

  @Override
  public String getData(ContentTextNode textNode) {
    return textNode.getData();
  }

  @Override
  public ContentElement getDocumentElement() {
    throw new RuntimeException("This is not implemented because the view is meant "
        + "as a generic singleton");
  }

  @Override
  public ContentNode getFirstChild(ContentNode node) {
    return node.getFirstChild();
  }

  @Override
  public ContentNode getLastChild(ContentNode node) {
    return node.getLastChild();
  }

  @Override
  public int getLength(ContentTextNode textNode) {
    return textNode.getLength();
  }

  @Override
  public ContentNode getNextSibling(ContentNode node) {
    return node.getNextSibling();
  }

  @Override
  public ContentElement getParentElement(ContentNode node) {
    return node.getParentElement();
  }

  @Override
  public ContentNode getPreviousSibling(ContentNode node) {
    return node.getPreviousSibling();
  }

  @Override
  public ContentElement asElement(ContentNode node) {
    return node != null ? node.asElement() : null;
  }

  @Override
  public ContentTextNode asText(ContentNode node) {
    return node != null ? node.asText() : null;
  }

  @Override
  public boolean isSameNode(ContentNode node, ContentNode other) {
    return node == other;
  }

  @Override
  public Map<String, String> getAttributes(ContentElement element) {
    return CollectionUtils.newJavaMap(element.getAttributes());
  }

  @Override
  public String getAttribute(ContentElement element, String name) {
    return element.getAttribute(name);
  }

  @Override
  public String getTagName(ContentElement element) {
    return element.getTagName();
  }

  @Override
  public void onBeforeFilter(Point<ContentNode> at) {
    // NO-OP
  }

  @Override
  public ContentNode getVisibleNode(ContentNode node) {
    return node;
  }

  @Override
  public ContentNode getVisibleNodeFirst(ContentNode node) {
    return node;
  }

  @Override
  public ContentNode getVisibleNodeLast(ContentNode node) {
    return node;
  }

  @Override
  public ContentNode getVisibleNodeNext(ContentNode node) {
    return node;
  }

  @Override
  public ContentNode getVisibleNodePrevious(ContentNode node) {
    return node;
  }
}