tobago-core/src/main/java/org/apache/myfaces/tobago/facelets/ContentTypeRule.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.myfaces.tobago.facelets;

import org.apache.myfaces.tobago.util.ComponentUtils;
import org.apache.myfaces.tobago.validator.FileItemValidator;

import javax.faces.view.facelets.FaceletContext;
import javax.faces.view.facelets.MetaRule;
import javax.faces.view.facelets.Metadata;
import javax.faces.view.facelets.MetadataTarget;
import javax.faces.view.facelets.TagAttribute;

public class ContentTypeRule extends MetaRule {

  public static final ContentTypeRule INSTANCE = new ContentTypeRule();

  @Override
  public Metadata applyRule(final String name, final TagAttribute attribute, final MetadataTarget metadataTarget) {
    if ("contentType".equals(name)) {
      return new ContentTypeRuleMapper(attribute);
    }
    return null;
  }

  static final class ContentTypeRuleMapper extends Metadata {

    private final TagAttribute attribute;

    ContentTypeRuleMapper(final TagAttribute attribute) {
      this.attribute = attribute;
    }

    @Override
    public void applyMetadata(final FaceletContext ctx, final Object instance) {
      final String[] components = ComponentUtils.splitList(attribute.getValue(ctx));
      ((FileItemValidator) instance).setContentType(components);
    }
  }
}