Java – Insert a XWPFParagraph in any position of a XWPFDocument

apache-poijava

Do you know if is there a way to insert a paragraph (XWPFParagraph) inside a paragraph fullfilled document (XWPFDocument)?.

There is a method to "change" an already existing paragraph inside the document to another paragraph (XWPFDocument.setParagraph()) but I don't figure out how to insert NEW paragraphs into a specific position inside the document, not at the end with XWPFDocument.createParagraph().

Best Answer

I've found a solution. The XWPFDocument has an ugly method insertNewParagraph(org.apache.xmlbeans.XmlCursor cursor). As you can see this method is passed a XmlCursor from the xmlbeans library. We can then do this:

XmlCursor cursor = par.getCTP().newCursor();
XWPFParagraph new_par = doc.insertNewParagraph(cursor);
new_par.createRun().setText("Stupid text");

Par is an XWPFParagraph inside the XWPFDocument doc. The new paragraph inserted (new_par in this snippet) will be inserted BEFORE the XmlObject the XmlCursor is pointing to.

Hope this help someone.

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Java – In Java, what is the best way to determine the size of an object

You can use the java.lang.instrument package.

Compile and put this class in a JAR:

import java.lang.instrument.Instrumentation;

public class ObjectSizeFetcher {
    private static Instrumentation instrumentation;

    public static void premain(String args, Instrumentation inst) {
        instrumentation = inst;
    }

    public static long getObjectSize(Object o) {
        return instrumentation.getObjectSize(o);
    }
}

Add the following to your MANIFEST.MF:

Premain-Class: ObjectSizeFetcher

Use the getObjectSize() method:

public class C {
    private int x;
    private int y;

    public static void main(String [] args) {
        System.out.println(ObjectSizeFetcher.getObjectSize(new C()));
    }
}

Invoke with:

java -javaagent:ObjectSizeFetcherAgent.jar C

Java – How to make the method return type generic

You could define callFriend this way:

public <T extends Animal> T callFriend(String name, Class<T> type) {
    return type.cast(friends.get(name));
}

Then call it as such:

jerry.callFriend("spike", Dog.class).bark();
jerry.callFriend("quacker", Duck.class).quack();

This code has the benefit of not generating any compiler warnings. Of course this is really just an updated version of casting from the pre-generic days and doesn't add any additional safety.

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Java – In Java, what is the best way to determine the size of an object

Java – How to make the method return type generic

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