Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!

Categories

Welcome to the new platform of Programmer's Heaven! We apologize for the inconvenience caused, if you visited us from a broken link of the previous version. The main reason to move to a new platform is to provide more effective and collaborative experience to you all. Please feel free to experience the new platform and use its exciting features. Contact us for any issue that you need to get clarified. We are more than happy to help you.

How to Search & Modify All Hyperlinks in MS Word File inside Android Apps

sheraz786sheraz786 Posts: 18Member

This technical tip explains how developers can find and modify all hyperlinks in a Microsoft Word document inside Android Applications.

package Examples;

import org.testng.annotations.Test;
import com.aspose.words.Document;
import com.aspose.words.NodeList;
import com.aspose.words.FieldStart;
import com.aspose.words.FieldType;
import com.aspose.words.NodeType;
import com.aspose.words.Run;
import com.aspose.words.Node;

import java.util.regex.Matcher;
import java.util.regex.Pattern;


/**
 * Shows how to replace hyperlinks in a Word document.
 */
public class ExReplaceHyperlinks extends ExBase
{
    /**
   {{ Finds all hyperlinks in a Word document and changes their URL and display name.
   {{/
    public void replaceHyperlinks() throws Exception
    {
        // Specify your document name here.
        Document doc = new Document(getMyDir() + "ReplaceHyperlinks.doc");

        // Hyperlinks in a Word documents are fields, select all field start nodes so we can find the hyperlinks.
        NodeList fieldStarts = doc.selectNodes("//FieldStart");
        for (FieldStart fieldStart : (Iterable<FieldStart>) fieldStarts)
        {
            if (fieldStart.getFieldType() == FieldType.FIELD_HYPERLINK)
            {
                // The field is a hyperlink field, use the "facade" class to help to deal with the field.
                Hyperlink hyperlink = new Hyperlink(fieldStart);

                // Some hyperlinks can be local (links to bookmarks inside the document), ignore these.
                if (hyperlink.isLocal())
                    continue;

                // The Hyperlink class allows to set the target URL and the display name
                // of the link easily by setting the properties.
                hyperlink.setTarget(NEW_URL);
                hyperlink.setName(NEW_NAME);
            }
        }

        doc.save(getMyDir() + "ReplaceHyperlinks Out.doc");
    }

    private static final String NEW_URL = "http://www.aspose.com";
    private static final String NEW_NAME = "Aspose - The .NET & Java Component Publisher";
}


/**
 * This "facade" class makes it easier to work with a hyperlink field in a Word document.
 *
 * A hyperlink is represented by a HYPERLINK field in a Word document. A field in Aspose.Words
 * consists of several nodes and it might be difficult to work with all those nodes directly.
 * Note this is a simple implementation and will work only if the hyperlink code and name
 * each consist of one Run only.
 *
 * [FieldStart][Run - field code][FieldSeparator][Run - field result][FieldEnd]
 *
 * The field code contains a string in one of these formats:
 * HYPERLINK "url"
 * HYPERLINK \l "bookmark name"
 *
 * The field result contains text that is displayed to the user.
 */
class Hyperlink
{
    Hyperlink(FieldStart fieldStart) throws Exception
    {
        if (fieldStart == null)
            throw new IllegalArgumentException("fieldStart");
        if (fieldStart.getFieldType() != FieldType.FIELD_HYPERLINK)
            throw new IllegalArgumentException("Field start type must be FieldHyperlink.");

        mFieldStart = fieldStart;

        // Find the field separator node.
        mFieldSeparator = findNextSibling(mFieldStart, NodeType.FIELD_SEPARATOR);
        if (mFieldSeparator == null)
            throw new IllegalStateException("Cannot find field separator.");

        // Find the field end node. Normally field end will always be found, but in the example document
        // there happens to be a paragraph break included in the hyperlink and this puts the field end
        // in the next paragraph. It will be much more complicated to handle fields which span several
        // paragraphs correctly, but in this case allowing field end to be null is enough for our purposes.
        mFieldEnd = findNextSibling(mFieldSeparator, NodeType.FIELD_END);

        // Field code looks something like [ HYPERLINK "http:\\www.myurl.com" ], but it can consist of several runs.
        String fieldCode = getTextSameParent(mFieldStart.getNextSibling(), mFieldSeparator);
        Matcher matcher = G_REGEX.matcher(fieldCode.trim());
        matcher.find();
        mIsLocal = (matcher.group(1) != null) && (matcher.group(1).length() > 0);    //The link is local if \l is present in the field code.
        mTarget = matcher.group(2).toString();
    }

    /**
   {{ Gets or sets the display name of the hyperlink.
   {{/
    String getName() throws Exception
    {
        return getTextSameParent(mFieldSeparator, mFieldEnd);
    }
    void setName(String value) throws Exception
    {
        // Hyperlink display name is stored in the field result which is a Run
        // node between field separator and field end.
        Run fieldResult = (Run)mFieldSeparator.getNextSibling();
        fieldResult.setText(value);

        // But sometimes the field result can consist of more than one run, delete these runs.
        removeSameParent(fieldResult.getNextSibling(), mFieldEnd);
    }

    /**
   {{ Gets or sets the target url or bookmark name of the hyperlink.
   {{/
    String getTarget() throws Exception
    {
        return mTarget;
    }
    void setTarget(String value) throws Exception
    {
        mTarget = value;
        updateFieldCode();
    }

    /**
   {{ True if the hyperlink's target is a bookmark inside the document. False if the hyperlink is a url.
   {{/
    boolean isLocal() throws Exception
    {
        return mIsLocal;
    }
    void isLocal(boolean value) throws Exception
    {
        mIsLocal = value;
        updateFieldCode();
    }

    private void updateFieldCode() throws Exception
    {
        // Field code is stored in a Run node between field start and field separator.
        Run fieldCode = (Run)mFieldStart.getNextSibling();
        fieldCode.setText(java.text.MessageFormat.format("HYPERLINK {0}\"{1}\"", ((mIsLocal) ? "\\l " : ""), mTarget));

        // But sometimes the field code can consist of more than one run, delete these runs.
        removeSameParent(fieldCode.getNextSibling(), mFieldSeparator);
    }

    /**
   {{ Goes through siblings starting from the start node until it finds a node of the specified type or null.
   {{/
    private static Node findNextSibling(Node startNode, int nodeType) throws Exception
    {
        for (Node node = startNode; node != null; node = node.getNextSibling())
        {
            if (node.getNodeType() == nodeType)
                return node;
        }
        return null;
    }

    /**
   {{ Retrieves text from start up to but not including the end node.
   {{/
    private static String getTextSameParent(Node startNode, Node endNode) throws Exception
    {
        if ((endNode != null) && (startNode.getParentNode() != endNode.getParentNode()))
            throw new IllegalArgumentException("Start and end nodes are expected to have the same parent.");

        StringBuilder builder = new StringBuilder();
        for (Node child = startNode; !child.equals(endNode); child = child.getNextSibling())
            builder.append(child.getText());

        return builder.toString();
    }

    /**
   {{ Removes nodes from start up to but not including the end node.
   {{ Start and end are assumed to have the same parent.
   {{/
    private static void removeSameParent(Node startNode, Node endNode) throws Exception
    {
        if ((endNode != null) && (startNode.getParentNode() != endNode.getParentNode()))
            throw new IllegalArgumentException("Start and end nodes are expected to have the same parent.");

        Node curChild = startNode;
        while ((curChild != null) && (curChild != endNode))
        {
            Node nextChild = curChild.getNextSibling();
            curChild.remove();
            curChild = nextChild;
        }
    }

    private final Node mFieldStart;
    private final Node mFieldSeparator;
    private final Node mFieldEnd;
    private boolean mIsLocal;
    private String mTarget;

    /**
   {{ RK I am notoriously bad at regexes. It seems I don't understand their way of thinking.
   {{/
    private static final Pattern G_REGEX = Pattern.compile(
        "\\S+" +            // one or more non spaces HYPERLINK or other word in other languages
        "\\s+" +            // one or more spaces
        "(?:\"\"\\s+)?" +    // non capturing optional "" and one or more spaces, found in one of the customers files.
        "(\\\\l\\s+)?" +    // optional \l flag followed by one or more spaces
        "\"" +                // one apostrophe
        "([How to Replace or Modify Hyperlinks^\"]+)" +        // one or more chars except apostrophe (hyperlink target)
        "\""                // one closing apostrophe
        );
}
Tagged:
Sign In or Register to comment.