source: profile/src/main/java/geniusweb/profile/utilityspace/ProductOfValue.java

package geniusweb.profile.utilityspace;

import java.util.ArrayList;
import java.util.List;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonValue;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;

import geniusweb.issuevalue.Value;

/**
 * A {@link Value} that is the product of some existing values
 */
@JsonDeserialize(using = JsonDeserializer.None.class)
public class ProductOfValue implements Value {
        private final List<Value> values = new ArrayList<Value>();

        /**
         * @param newvals the values to make a product of
         */
        @JsonCreator
        public ProductOfValue(List<Value> newvals) {
                values.addAll(newvals);
        }

        @JsonValue
        public List<Value> getValues() {
                return values;
        }

        @Override
        public String toString() {
                return values.toString();
        }

        @Override
        public int hashCode() {
                final int prime = 31;
                int result = 1;
                result = prime * result + ((values == null) ? 0 : values.hashCode());
                return result;
        }

        /**
         * 
         * @param other a {@link ProductOfValue} with more issues to be merged into
         *              this.
         * @return new ProductOfValue that contains this and other values.
         */
        public ProductOfValue merge(ProductOfValue other) {
                List<Value> newvalues = new ArrayList<Value>(values);
                newvalues.addAll(other.getValues());
                return new ProductOfValue(newvalues);
        }

        @Override
        public boolean equals(Object obj) {
                if (this == obj)
                        return true;
                if (obj == null)
                        return false;
                if (getClass() != obj.getClass())
                        return false;
                ProductOfValue other = (ProductOfValue) obj;
                if (values == null) {
                        if (other.values != null)
                                return false;
                } else if (!values.equals(other.values))
                        return false;
                return true;
        }

        @Override
        public Object getValue() {
                return getValues();
        }

}