package com.googlecode.mjorm.query.criteria;
import com.googlecode.mjorm.ObjectMapper;
import com.googlecode.mjorm.mql.MqlCriterionFunction;
import com.googlecode.mjorm.mql.AbstractMqlCriterionFunction;
import com.mongodb.BasicDBObject;
public class ExistsCriterion
extends AbstractCriterion {
private Boolean value;
public ExistsCriterion(Boolean value) {
this.value = value;
}
/**
* @return the value
*/
public Boolean getValue() {
return value;
}
/**
* {@inheritDoc}
*/
@Override
public Object toQueryObject(ObjectMapper mapper) {
return new BasicDBObject("$exists", value);
}
public static MqlCriterionFunction createFunction(final String functionName) {
return new AbstractMqlCriterionFunction() {
protected void init() {
setFunctionName(functionName);
setMinArgs(1);
setMaxArgs(1);
setTypes(Boolean.class);
}
@Override
protected Criterion doCreate(Object[] values) {
Boolean arg = (values.length>0) ? Boolean.class.cast(values[0]) : true;
return new ExistsCriterion(arg);
}
@Override
protected Criterion doCreate() {
return new ExistsCriterion(true);
}
};
}
public static MqlCriterionFunction createNegatedFunction(final String functionName) {
return new AbstractMqlCriterionFunction() {
protected void init() {
setFunctionName(functionName);
setMinArgs(1);
setMaxArgs(1);
setTypes(Boolean.class);
}
@Override
protected Criterion doCreate(Object[] values) {
Boolean arg = (values.length>0) ? Boolean.class.cast(values[0]) : false;
return new ExistsCriterion(arg);
}
@Override
protected Criterion doCreate() {
return new ExistsCriterion(false);
}
};
}
}