com.phloc.css.reader.errorhandler.CollectingCSSParseErrorHandler Maven / Gradle / Ivy

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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.reader.errorhandler;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

import javax.annotation.Nonnegative;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.annotation.concurrent.GuardedBy;
import javax.annotation.concurrent.ThreadSafe;

import com.phloc.commons.annotations.Nonempty;
import com.phloc.commons.annotations.ReturnsMutableCopy;
import com.phloc.commons.collections.ContainerHelper;
import com.phloc.commons.string.ToStringGenerator;
import com.phloc.css.parser.ParseException;
import com.phloc.css.parser.Token;

/**
 * A collecting implementation of {@link ICSSParseErrorHandler}. So in case a
 * recoverable error occurs, it is remembered in the internal list and can be
 * retrieved by {@link #getAllParseErrors()}.
 * 
 * @author Philip Helger
 */
@ThreadSafe
public class CollectingCSSParseErrorHandler implements ICSSParseErrorHandler
{
  private final ReadWriteLock m_aRWLock = new ReentrantReadWriteLock ();
  @GuardedBy ("m_aRWLock")
  private final List  m_aErrors = new ArrayList  ();
  private final ICSSParseErrorHandler m_aNestedErrorHandler;

  public CollectingCSSParseErrorHandler ()
  {
    this (null);
  }

  public CollectingCSSParseErrorHandler (@Nullable final ICSSParseErrorHandler aNestedErrorHandler)
  {
    m_aNestedErrorHandler = aNestedErrorHandler;
  }

  public void onCSSParseError (@Nonnull final Token aLastValidToken,
                               @Nonnull final int [][] aExpectedTokenSequencesVal,
                               @Nonnull final String [] aTokenImageVal,
                               @Nullable final Token aLastSkippedToken) throws ParseException
  {
    m_aRWLock.writeLock ().lock ();
    try
    {
      m_aErrors.add (new CSSParseError (aLastValidToken, aExpectedTokenSequencesVal, aTokenImageVal, aLastSkippedToken));
    }
    finally
    {
      m_aRWLock.writeLock ().unlock ();
    }
    if (m_aNestedErrorHandler != null)
      m_aNestedErrorHandler.onCSSParseError (aLastValidToken,
                                             aExpectedTokenSequencesVal,
                                             aTokenImageVal,
                                             aLastSkippedToken);
  }

  public void onCSSUnexpectedRule (@Nonnull final Token aCurrentToken,
                                   @Nonnull @Nonempty final String sRule,
                                   @Nonnull @Nonempty final String sMsg) throws ParseException
  {
    m_aRWLock.writeLock ().lock ();
    try
    {
      m_aErrors.add (CSSParseError.createUnexpectedRule (aCurrentToken, sRule, sMsg));
    }
    finally
    {
      m_aRWLock.writeLock ().unlock ();
    }
    if (m_aNestedErrorHandler != null)
      m_aNestedErrorHandler.onCSSUnexpectedRule (aCurrentToken, sRule, sMsg);
  }

  /**
   * @return true if at least one parse error is contained,
   *         false otherwise.
   */
  @Nonnegative
  public boolean hasParseErrors ()
  {
    m_aRWLock.readLock ().lock ();
    try
    {
      return !m_aErrors.isEmpty ();
    }
    finally
    {
      m_aRWLock.readLock ().unlock ();
    }
  }

  /**
   * @return The number of contained parse errors. Always ≥ 0.
   */
  @Nonnegative
  public int getParseErrorCount ()
  {
    m_aRWLock.readLock ().lock ();
    try
    {
      return m_aErrors.size ();
    }
    finally
    {
      m_aRWLock.readLock ().unlock ();
    }
  }

  /**
   * @return A copy of the list with all contained errors. Never
   *         null but maybe empty.
   * @see #getParseErrorCount()
   * @see #hasParseErrors()
   */
  @Nonnull
  @ReturnsMutableCopy
  public List  getAllParseErrors ()
  {
    m_aRWLock.readLock ().lock ();
    try
    {
      return ContainerHelper.newList (m_aErrors);
    }
    finally
    {
      m_aRWLock.readLock ().unlock ();
    }
  }

  @Override
  public String toString ()
  {
    return new ToStringGenerator (this).append ("errors", m_aErrors).toString ();
  }
}