A class to compare EOs according to the eoEquals contract when evaluating qualifiers in memory.

EOComparisonSupport.java

package org.wocommunity.eof;

import com.webobjects.eocontrol.EOEnterpriseObject;
import com.webobjects.eocontrol.EOQualifier.ComparisonSupport;
import com.webobjects.foundation.NSKeyValueCoding;

import er.extensions.eof.ERXEOControlUtilities;

/**
 * The {@code EOComparisonSupport} extends the {@code EOQualifier.ComparisonSupport} class and evaluates all
 * {@code EOGenericRecord} objects according to the {@code ERXEOControlUtilities.eoEquals} contract.
 * <p>
 * Include the code below during the application initialization to enable support for this class:
 *
 * <pre>
 * EOKeyValueQualifier.ComparisonSupport.setSupportForClass(new EOComparisonSupport(), EOGenericRecord.class);
 * </pre>
 *
 * Note: This class fixes the problem when evaluating toOne relationships in memory. It doesn't change the behavior when
 * evaluating arrays of EOs using the contains selector.
 *
 * @author <a href="mailto:[email protected]">Henrique Prange</a>
 */
public class EOComparisonSupport extends ComparisonSupport {
    /**
     * Compares two {@code EOEnterpriseObject}s according to the {@code ERXEOControlUtilities.eoEquals} contract.
     *
     * @see com.webobjects.eocontrol.EOQualifier.ComparisonSupport#isEqualTo(java.lang.Object, java.lang.Object)
     */
    @Override
    public boolean isEqualTo(Object left, Object right) {
        Object leftValue = left == NSKeyValueCoding.NullValue ? null : left;
        Object rightValue = right == NSKeyValueCoding.NullValue ? null : right;

        return ERXEOControlUtilities.eoEquals((EOEnterpriseObject) leftValue, (EOEnterpriseObject) rightValue);
    }
}