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phloc CSS parser an other components

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/**
 * Copyright (C) 2006-2014 phloc systems
 * http://www.phloc.com
 * office[at]phloc[dot]com
 *
 * 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.phloc.css;

import java.io.Serializable;

import javax.annotation.Nonnegative;
import javax.annotation.Nonnull;

/**
 * Interface for objects that can be written to CSS.
 * 
 * @author Philip Helger
 */
public interface ICSSWriteable extends Serializable
{
  /**
   * Get the contents of this object as a serialized CSS string for writing to
   * an output.
   * 
   * @param aSettings
   *        The settings to be used to format the output. May not be
   *        null.
   * @param nIndentLevel
   *        The current indentation level
   * @return The content of this object as CSS string.
   */
  @Nonnull
  String getAsCSSString (@Nonnull ICSSWriterSettings aSettings, @Nonnegative int nIndentLevel);
}