package org.apache.ibatis.builder.xml.dynamic;
import org.apache.ibatis.builder.BuilderException;
import org.apache.ibatis.mapping.SqlMapperException;
import org.apache.ibatis.ognl.Ognl;
import org.apache.ibatis.ognl.OgnlException;
import java.math.BigDecimal;
import java.util.Arrays;
public class ExpressionEvaluator {
public boolean evaluateBoolean(String expression, Object parameterObject) {
try {
Object value = Ognl.getValue(expression, parameterObject);
if (value instanceof Boolean) return (Boolean) value;
if (value instanceof Number) return !new BigDecimal(String.valueOf(value)).equals(BigDecimal.ZERO);
return value != null;
} catch (OgnlException e) {
throw new BuilderException("Error evaluating expression '" + expression + "'. Cause: " + e, e);
}
}
public Iterable evaluateIterable(String expression, Object parameterObject) {
try {
Object value = Ognl.getValue(expression, parameterObject);
if (value == null) throw new SqlMapperException("The expression '" + expression + "' evaluated to a null value.");
if (value instanceof Iterable) return (Iterable) value;
if (value.getClass().isArray()) return Arrays.asList((Object[]) value);
throw new BuilderException("Error evaluating expression '" + expression + "'. Return value (" + value + ") was not iterable.");
} catch (OgnlException e) {
throw new BuilderException("Error evaluating expression '" + expression + "'. Cause: " + e, e);
}
}
}