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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.decl;

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

import com.phloc.commons.annotations.Nonempty;
import com.phloc.commons.lang.EnumHelper;
import com.phloc.commons.name.IHasName;
import com.phloc.css.ECSSVersion;
import com.phloc.css.ICSSVersionAware;
import com.phloc.css.ICSSWriteable;
import com.phloc.css.ICSSWriterSettings;

/**
 * Enumeration with selector attribute operations as in
 * [foo^="bar"]
 * 
 * @author Philip Helger
 */
public enum ECSSAttributeOperator implements ICSSVersionAware, ICSSWriteable, IHasName
{
  EQUALS ("=", ECSSVersion.CSS21),
  INCLUDES ("~=", ECSSVersion.CSS21),
  DASHMATCH ("|=", ECSSVersion.CSS21),
  BEGINMATCH ("^=", ECSSVersion.CSS30),
  ENDMATCH ("$=", ECSSVersion.CSS30),
  CONTAINSMATCH ("*=", ECSSVersion.CSS21);

  private final String m_sName;
  private final ECSSVersion m_eVersion;

  private ECSSAttributeOperator (@Nonnull @Nonempty final String sName, @Nonnull final ECSSVersion eVersion)
  {
    m_sName = sName;
    m_eVersion = eVersion;
  }

  @Nonnull
  @Nonempty
  public String getName ()
  {
    return m_sName;
  }

  @Nonnull
  public ECSSVersion getMinimumCSSVersion ()
  {
    return m_eVersion;
  }

  @Nonnull
  @Nonempty
  public String getAsCSSString (@Nonnull final ICSSWriterSettings aSettings, @Nonnegative final int nIndentLevel)
  {
    aSettings.checkVersionRequirements (this);
    return m_sName;
  }

  @Nullable
  public static ECSSAttributeOperator getFromNameOrNull (@Nullable final String sName)
  {
    return EnumHelper.getFromNameOrNull (ECSSAttributeOperator.class, sName);
  }
}