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// XParseError.java - An error handler for xparse

/*
 * 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.xml.resolver.apps;

import java.net.URL;
import java.net.MalformedURLException;

import org.xml.sax.SAXParseException;
import org.xml.sax.ErrorHandler;

import org.apache.xml.resolver.helpers.FileURL;

/**
 * An ErrorHandler for xparse.
 *
 * This class is just the error handler for xparse.
 *
 * @see xparse
 *
 * @author Norman Walsh
 * [email protected]
 *
 * @version 1.0
 */
public class XParseError implements ErrorHandler {
  /** Show errors? */
  private boolean showErrors = true;

  /** Show warnings? */
  private boolean showWarnings = false;

  /** How many messages should be presented? */
  private int maxMessages = 10;

  /** The number of fatal errors seen so far. */
  private int fatalCount = 0;

  /** The number of errors seen so far. */
  private int errorCount = 0;

  /** The number of warnings seen so far. */
  private int warningCount = 0;

  /** The base URI of the running application. */
  private String baseURI = "";

  /** Constructor */
  public XParseError(boolean errors, boolean warnings) {
    showErrors = errors;
    showWarnings = warnings;

    try {
      URL url = FileURL.makeURL("basename");
      baseURI = url.toString();
    } catch (MalformedURLException mue) {
      // nop;
    }
  }

  /** Return the error count */
  public int getErrorCount() {
    return errorCount;
  }

  /** Return the fatal error count */
  public int getFatalCount() {
    return fatalCount;
  }

  /** Return the warning count */
  public int getWarningCount() {
    return warningCount;
  }

  /** Return the number of messages to display */
  public int getMaxMessages() {
    return maxMessages;
  }

  /** Set the number of messages to display */
  public void setMaxMessages(int max) {
    maxMessages = max;
  }

  /** SAX2 API */
  public void error(SAXParseException exception) {
    errorCount++;
    if (showErrors && (errorCount+warningCount < maxMessages)) {
	message("Error", exception);
    }
  }

  /** SAX2 API */
  public void fatalError(SAXParseException exception) {
    errorCount++;
    fatalCount++;
    if (showErrors && (errorCount+warningCount < maxMessages)) {
	message("Fatal error", exception);
    }
  }

  /** SAX2 API */
  public void warning(SAXParseException exception) {
    warningCount++;
    if (showWarnings && (errorCount+warningCount < maxMessages)) {
	message("Warning", exception);
    }
  }

  /** Display a message to the user */
  private void message(String type, SAXParseException exception) {
    String filename = exception.getSystemId();
    if (filename.startsWith(baseURI)) {
      filename = filename.substring(baseURI.length());
    }

    System.out.print(type
		     + ":"
		     + filename
		     + ":"
		     + exception.getLineNumber());

    if (exception.getColumnNumber() > 0) {
      System.out.print(":" + exception.getColumnNumber());
    }

    System.out.println(":" + exception.getMessage());
  }
}