WorkspaceFormValidator.java

package edu.asu.spring.quadriga.validator;

import java.util.List;

import org.springframework.stereotype.Service;
import org.springframework.validation.Errors;
import org.springframework.validation.Validator;

import edu.asu.spring.quadriga.web.workspace.backing.ModifyWorkspace;
import edu.asu.spring.quadriga.web.workspace.backing.ModifyWorkspaceForm;

/**
 * This class validates if any workspace is selected
 * 
 * @author kiran batna
 *
 */
@Service
public class WorkspaceFormValidator implements Validator {

    @Override
    public boolean supports(Class<?> arg0) {
        return arg0.isAssignableFrom(ModifyWorkspaceForm.class);
    }

    @Override
    public void validate(Object obj, Errors err) {
        boolean isAllNull = true;

        ModifyWorkspaceForm workspaceForm = (ModifyWorkspaceForm) obj;
        List<ModifyWorkspace> workspaceList = workspaceForm.getWorkspaceList();

        if (workspaceList != null) {
            // validating if any row is selected
            for (ModifyWorkspace workspace : workspaceList) {
                String internalId = workspace.getId();
                if (internalId != null) {
                    isAllNull = false;
                    break;
                }
            }
        }
        if (isAllNull) {
            err.reject("workspace_selection.required");
        }
    }

}