ConfigTextContentAdapter.java

package org.lttpp.eemory.ui;

import org.apache.commons.lang3.StringUtils;
import org.eclipse.jface.fieldassist.TextContentAdapter;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Text;

public class ConfigTextContentAdapter extends TextContentAdapter {

    private String byOperator;

    @Override
    public void insertControlContents(final Control control, final String text, final int cursorPosition) {
        if (!StringUtils.isEmpty(byOperator)) {
            String existingText = ((Text) control).getText();
            if (existingText.contains(byOperator)) {
                ((Text) control).setText(existingText.substring(0, existingText.lastIndexOf(byOperator) + 1));
            } else {
                ((Text) control).setText(StringUtils.EMPTY);
            }
            int newCursorPosition = ((Text) control).getText().length();
            ((Text) control).setSelection(newCursorPosition, newCursorPosition);
        }

        super.insertControlContents(control, text, cursorPosition);
    }

    public String getByOperator() {
        return byOperator;
    }

    public void setByOperator(final String byOperator) {
        this.byOperator = byOperator;
    }

}