Java

Find and Update an XML Attribute Value

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Demonstrates how to find an element in XML with a specified attribute name and then update the attribute value. Chilkat2 Java

import com.chilkatsoft.chilkat2.StringBuilder;
import com.chilkatsoft.chilkat2.Xml;

public class ChilkatExample {

    public static void main(String[] args) {
        // Let's say you have 2 XML files with identical structures as shown directly below,
        // and you wish to update the values in the 1st XML file with those in the 2nd XML file.

        // <global>
        //     <phrase id="2FADisabled" value="2factor authentication disabled"/>
        //     <phrase id="2FAEnabled" value="2factor authentication enabled"/>
        //     <phrase id="2FAResetFailed" value="Failed to disable two factor authentication"/>
        // </global>

        // <global>
        //     <phrase id="2FAResetFailed" value="Failed to reset two factor authentication"/>
        //     <phrase id="2FADisabled" value="2FA authentication disabled"/>
        //     <phrase id="2FAEnabled" value="2FA authentication enabled"/>
        // </global>

        // First, initialize each of the Chilkat XML objects.
        // These could be loaded from files, but we'll just create them manually for this example..

        Xml xml1 = new Xml();
        xml1.setTag("global");
        xml1.updateAttrAt("phrase", true, "id", "2FADisabled");
        xml1.updateAttrAt("phrase", true, "value", "2factor authentication disabled");
        xml1.updateAttrAt("phrase[1]", true, "id", "2FAEnabled");
        xml1.updateAttrAt("phrase[1]", true, "value", "2factor authentication enabled");
        xml1.updateAttrAt("phrase[2]", true, "id", "2FAResetFailed");
        xml1.updateAttrAt("phrase[2]", true, "value", "Failed to disable two factor authentication");

        Xml xml2 = new Xml();
        xml2.setTag("global");
        xml2.updateAttrAt("phrase", true, "id", "2FAResetFailed");
        xml2.updateAttrAt("phrase", true, "value", "Failed to reset two factor authentication");
        xml2.updateAttrAt("phrase[1]", true, "id", "2FADisabled");
        xml2.updateAttrAt("phrase[1]", true, "value", "2FA authentication disabled");
        xml2.updateAttrAt("phrase[2]", true, "id", "2FAEnabled");
        xml2.updateAttrAt("phrase[2]", true, "value", "2FA authentication enabled");

        // Iterate over attribute values in xml2 and update the same in xml1.

        String phrase_id = "";
        String phrase_value = "";

        StringBuilder sbPath = new StringBuilder();

        int i = 0;
        int count_i = xml2.numChildrenHavingTag("phrase");
        while (i < count_i) {
            xml2.setI(i);
            phrase_id = xml2.chilkatPath("phrase[i]|(id)");
            phrase_value = xml2.chilkatPath("phrase[i]|(value)");

            // Notice how the UpdateAttrAt method's 1st argument is a Chilkat path -- which is an expression
            // to find the location of the XML element to be updated.
            // Here we create a path of the form "/A/tagName,attributeName,attributeValuePattern", which means
            // find the direct descendent of xml2 having tag=tagName, with an attribute=attributeName where the attribute value
            // matches the attributeValuePattern.  If attributeValuePattern does not contain a "*", then it must match directly.
            // We'll build a Chilkat path such as "/A/phrase,id,2FADisabled"
            sbPath.setString("/A/phrase,id,");
            sbPath.append(phrase_id);

            // This assumes the corresponding element exists in xml1.
            xml1.updateAttrAt(sbPath.getAsString(), true, "value", phrase_value);

            i = i + 1;
        }

        // Now see how xml1 has been updated..
        System.out.println(xml1.getXml());

        // <global>
        //     <phrase id="2FADisabled" value="2FA authentication disabled"/>
        //     <phrase id="2FAEnabled" value="2FA authentication enabled"/>
        //     <phrase id="2FAResetFailed" value="Failed to reset two factor authentication"/>
        // </global>
    }
}