ErrorFormatterWithFirstErrorStackTrace.java

package org.robobinding.binder;

import java.text.MessageFormat;
import java.util.Collection;

import org.robobinding.binder.ViewHierarchyInflationErrorsException.ErrorFormatter;
import org.robobinding.util.Throwables;

/**
 * 
 * @since 1.0
 * @version $Revision: 1.0 $
 * @author Cheng Wei
 */
class ErrorFormatterWithFirstErrorStackTrace implements ErrorFormatter {
	private static final String LINE_SEPARATOR = System.getProperty("line.separator");

	@Override
	public String format(ViewInflationErrors inflationError) {
		ErrorMessageBuilder errorMessageBuilder = new ErrorMessageBuilder(inflationError);
		return errorMessageBuilder.build();
	}

	private static class ErrorMessageBuilder {
		private ViewInflationErrors inflationError;
		private StringBuilder errorMessage;

		public ErrorMessageBuilder(ViewInflationErrors inflationError) {
			this.inflationError = inflationError;
		}

		public String build() {
			errorMessage = new StringBuilder();

			addBriefErrorList();
			addFirstErrorStackTrace();

			return errorMessage.toString();
		}

		private void addBriefErrorList() {
			addErrorListHeader();
			addErrorListBody();
		}

		private void addErrorListHeader() {
			errorMessage.append(withNewLine(MessageFormat.format("-------------------------{0}({1} errors)-----------------------",
					inflationError.getViewName(), inflationError.numErrors())));
		}

		private void addErrorListBody() {
			Collection<Exception> errors = inflationError.getErrors();
			for (Exception error : errors) {
				errorMessage.append(withNewLine(error.toString()));
				errorMessage.append(newLine());
			}

			if (!errors.isEmpty()) {
				removeLastNewLine();
			}
		}

		private void removeLastNewLine() {
			int endIndex = errorMessage.length();
			int startIndex = endIndex - lengthOfNewLineText();
			errorMessage.delete(startIndex, endIndex);
		}

		private int lengthOfNewLineText() {
			return newLine().length();
		}

		private String withNewLine(String str) {
			return str + newLine();
		}

		private String newLine() {
			return LINE_SEPARATOR;
		}

		private void addFirstErrorStackTrace() {
			errorMessage.append(withNewLine("-------------------------The first error stack trace-----------------------"));
			Exception firstError = getFirstError();
			String stackTrace = Throwables.getStackTraceAsString(firstError);
			errorMessage.append(withNewLine(stackTrace));
		}

		private Exception getFirstError() {
			return inflationError.getErrors().iterator().next();
		}
	}
}