JavaSourceFormatter.java

package ru.naumen.gintonic.project.source.formatter;

import java.util.Map;

import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.ToolFactory;
import org.eclipse.jdt.core.formatter.CodeFormatter;
import org.eclipse.jdt.core.formatter.DefaultCodeFormatterConstants;
import org.eclipse.jface.text.Document;
import org.eclipse.jface.text.IDocument;
import org.eclipse.text.edits.TextEdit;

public class JavaSourceFormatter {

    /**
     * Format source code with Eclipse's default CodeFormatter.
     * 
     * @param code
     *            source code
     * @return formatter code
     */
    public static String format(String code) {

        @SuppressWarnings("unchecked")
        Map<String, String> options = DefaultCodeFormatterConstants.getEclipseDefaultSettings();

        options.put(JavaCore.COMPILER_COMPLIANCE, JavaCore.VERSION_1_5);
        options.put(JavaCore.COMPILER_CODEGEN_TARGET_PLATFORM, JavaCore.VERSION_1_5);
        options.put(JavaCore.COMPILER_SOURCE, JavaCore.VERSION_1_5);

        CodeFormatter codeFormatter = ToolFactory.createCodeFormatter(options);
        TextEdit edit = codeFormatter.format(CodeFormatter.K_UNKNOWN, code, 0, code.length(), 0,
                System.getProperty("line.separator")); //$NON-NLS-1$
        if (edit == null) {
            throw new SourceFormatFailedException("cannot format this: " + code);
        }

        IDocument document = new Document(code);

        try {
            edit.apply(document);
        } catch (Exception e) {
            throw new SourceFormatFailedException("cannot format this: " + code, e);
        }

        return document.get();
    }

}