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3.5 Criteria modifier example

  1. Single parameter example:

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...

  1. public void filterOutNotBelongingToCurrentUser(final SearchCriteriaBuilder scb) {

...

  1.

...

  1. scb.add(SearchRestrictions.eq("owner", securityService.getCurrentUserName()));

...

  1. 
}
  2. Context example: 
    Models:
    1. Shop
    2. Chain
    3. Industry
    Relations
    1. Shop hasMany Industries
    2. Chain hasMany Industries
    3. Shop belongsTo Chain
     

    Target: In industires lookup in shop details view show only industires that are in relation with chain of the shop. 

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    <view name="shopDetails" modelName="shop" ...>
     <component type="window" name="window">           
			...
           <component type="form" name="form" reference="form">
                   ...
                    <component type="lookup" name="industry" reference="industryLookup" 
								field="industries" defaultVisible="false" persistent="false" hasLabel="false">
                       ...
                            <criteriaModifier 
								class="com.qcadoo.sdt.basic.criteriaModifiers.ShopIndustryLookupCriteriaModifier"						    
								method="restrictIndustriesToChainContext" />
                    </component>
					...
           </component>
     </component>
    <hooks>
		<beforeRender class="com.qcadoo.sdt.basic.hooks.view.ShopDetailsBeforeRenderService" 
					method="setCriteriaModifierParameters"/>
    </hooks>
</view>
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    @Service
public class ShopDetailsBeforeRenderService {

    public void setCriteriaModifierParameters(final ViewDefinitionState state) {
        LookupComponent industryLookup = (LookupComponent) state.getComponentByReference("industryLookup");
        FormComponent form = (FormComponent) state.getComponentByReference("form");

        Entity shop = form.getEntity();
        if (shop.getId() != null) {
            Entity chain = shop.getBelongsToField(ShopFields.CHAIN_FIELD);
            FilterValueHolder holder = industryLookup.getFilterValue();
            holder.put(ShopIndustryLookupCriteriaModifier.CHAIN_PARAMETER, chain.getId());
            industryLookup.setFilterValue(holder);
        }
    }
}

     

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    @Service
public class ShopIndustryLookupCriteriaModifier {

	public static final String CHAIN_PARAMETER = "chain";
	
	private static final String CHAIN_REQUIRED = "Chain parameter is required";

	public void restrictIndustriesToChainContext(final SearchCriteriaBuilder scb, final FilterValueHolder filterValue){
		if(!filterValue.has(CHAIN_PARAMETER)){
			throw new IllegalArgumentException(CHAIN_REQUIRED);
		}
		
		Long chainId = filterValue.getLong(CHAIN_PARAMETER);
		scb.createAlias(IndustryFields.CHAINS_FIELD, "c").add(SearchRestrictions.eq("c.id", chainId));
	}
}