source: java/main/src/main/java/com/framsticks/params/PrimitiveParam.java

package com.framsticks.params;

import com.framsticks.util.FramsticksException;
import com.framsticks.util.Misc;
import com.framsticks.util.lang.Numbers;
import com.framsticks.util.lang.Strings;

import javax.annotation.concurrent.Immutable;

/**
 * @author Piotr Sniegowski
 */
@Immutable
public abstract class PrimitiveParam<S> extends ValueParam {

        /** The minimum allowed value of parameter. */
        protected final Object min;

        /** The maximum allowed value of parameter. */
        protected final Object max;

        /** The default value of parameter. */
        protected final Object def;

        /**
         * @param builder
         */
        public PrimitiveParam(ParamBuilder builder) {
                super(builder);
                Class<?> storageType = Misc.returnNotNull(builder.getStorageType(), Object.class);
                min = tryCastAndReturn(builder.getMin(), storageType);
                max = tryCastAndReturn(builder.getMax(), storageType);
                def = tryCastAndReturn(builder.getDef(), storageType);
        }

        // public void save(Sink sink, Object value) {
        //      sink.print(value);
        // }

        protected <T> T tryCastAndReturn(Object value, Class<T> type) {
                if (value == null) {
                        return null;
                }
                try {
                        if (type.equals(Object.class)) {
                                return type.cast(value);
                        }
                        if (value instanceof String) {
                                if (type.equals(String.class)) {
                                        return type.cast(value);
                                }
                                return Numbers.parse((String) value, type);
                        } if ((value instanceof Integer) && (type.equals(Double.class))) {
                                return type.cast(new Double((Integer) value));
                        } else {
                                return type.cast(value);
                        }
                } catch (ClassCastException e) {
                        throw new FramsticksException().msg("failed to cast").cause(e).arg("param", this).arg("actual", value.getClass()).arg("requested", type).arg("value", value);
                }
        }

        /**
         * Gets the minimum value of parameter.
         *
         * @param <T> the generic getType which must be correctly specified by user
         * @param type the getType of variable, can be checked by
         * @return the minimum allowed value of parameter
         * @throws ClassCastException the class cast exception, thrown when given getType is incorrect
         */
        public <T> T getMin(Class<T> type) {
                return tryCastAndReturn(min, type);
        }

        /**
         * Gets the maximum value of parameter.
         *
         * @param <T> the generic getType which must be correctly specified by user
         * @param type the getType of variable, can be checked by {@link #getStorageType()}
         * @return the maximum allowed value of parameter
         * @throws ClassCastException the class cast exception, thrown when given getType is incorrect
         */
        public <T> T getMax(Class<T> type) {
                return tryCastAndReturn(max, type);
        }

        /**
         * Gets the default value of parameter.
         *
         * @param <T> the generic getType which must be correctly specified by user
         * @param type the getType of variable, can be checked by {@link #getStorageType()}
         * @return the default value of parameter
         * @throws ClassCastException the class cast exception, thrown when given getType is incorrect
         */
        public <T> T getDef(Class<T> type) {
                return tryCastAndReturn(def, type);
        }

        public <T> String serialize(T value) {
                return Strings.toStringNullProof(value);
        }

}