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Nomin is a mapping engine for the Java platform. It provides abilities to transform object trees according to declarative mapping rules. Main features of Nomin are no XML configuration, intuitively looking mapping, using arbitrary expressions and method invocations in mappings, pre and postprocessing right in a mapping listing, customizations. It's applicable for any Java compatible classes, not only JavaBeans.

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package org.nomin.core;

/**
 * Contains characteristics of a mapping.
 * @author Dmitry Dobrynin
 *         Date: 28.07.11 time: 5:18
 */
@SuppressWarnings({"EqualsWhichDoesntCheckParameterClass"})
public class MappingKey {
    final Class source, target;
    final Object mappingCase;
    final boolean includeInverse;

    public MappingKey(Class source, Class target, Object mappingCase) {
        this.source = source; this.target = target; this.mappingCase = mappingCase; includeInverse = false;
    }

    public MappingKey(ParsedMapping pm) {
        this.source = pm.sideA; this.target = pm.sideB; this.mappingCase = pm.mappingCase; includeInverse = true;
    }

    public boolean equals(Object obj) { // There cannot be the same key
        MappingKey k = (MappingKey) obj;
        return ((source == k.source && target == k.target) ^ (includeInverse && source == k.target && target == k.source)) &&
                ((mappingCase == null && k.mappingCase == null) ^ (mappingCase != null && mappingCase.equals(k.mappingCase)));
    }

    public int hashCode() {
        return source.hashCode() * 13 + 31 * target.hashCode() + (mappingCase != null ? 71 * mappingCase.hashCode() : 0);
    }
}