com.crabshue.commons.xml.processinginstructions.ProcessingInstructionsUtils Maven / Gradle / Ivy

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package com.crabshue.commons.xml.processinginstructions;

import java.util.Collection;

import org.w3c.dom.Document;

import com.crabshue.commons.exceptions.ApplicationException;
import com.crabshue.commons.xml.XmlPrintUtils;
import com.crabshue.commons.xml.exceptions.XmlErrorContext;
import com.crabshue.commons.xml.exceptions.XmlErrorType;
import lombok.NonNull;

/**
 * Utility class for processing instructions operations.
 */
public class ProcessingInstructionsUtils {

    protected ProcessingInstructionsUtils() {
    }

    /**
     * Retrieve the first line with a processing instruction in an {@link Document XML document}.
     *
     * @param document the document
     * @return the first line with a processing instruction.
     */
    public static String retrieveFirstNonProcessingInstructionLine(@NonNull final Document document) {

        final Collection lines = XmlPrintUtils.stringify(document, new XmlPrintUtils.Options().setOmitXmlDeclaration(true));

        return retrieveFirstNonProcessingInstructionLine(lines);
    }

    /**
     * Retrieve among a collection of {@link String} the first one that is not a processing instruction.
     *
     * @param lines the lines.
     * @return the matching line.
     */
    public static String retrieveFirstNonProcessingInstructionLine(@NonNull final Collection lines) {

        for (String line : lines) {
            if (line.matches(ProcessingInstructionsConstants.PROCESSING_INSTRUCTION_START)) {
                continue;
            }
            return line;
        }
        throw new ApplicationException(XmlErrorType.XML_NO_NON_PI_LINE, "Found no non-processing-instruction line")
            .addContextValue(XmlErrorContext.LINES, lines);
    }
}