org.camunda.spin.spi.TextBasedDataFormatReader Maven / Gradle / Ivy
/* 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 org.camunda.spin.spi;
import java.io.IOException;
import java.io.Reader;
import java.util.regex.Pattern;
import org.camunda.spin.impl.logging.SpinCoreLogger;
/**
* Can be used as a base class to determine whether an input reader
* is readable by applying regular expression matching.
*
* @author Lindhauer
*/
public abstract class TextBasedDataFormatReader implements DataFormatReader {
private static final SpinCoreLogger LOG = SpinCoreLogger.CORE_LOGGER;
public boolean canRead(Reader input, int readLimit) {
char[] firstCharacters = new char[readLimit];
try {
input.read(firstCharacters, 0, readLimit);
} catch (IOException e) {
throw LOG.unableToReadFromReader(e);
}
Pattern pattern = getInputDetectionPattern();
return pattern.matcher(new String(firstCharacters)).find();
}
protected abstract Pattern getInputDetectionPattern();
}