org.javers.core.diff.custom.NullAsBlankStringComparator Maven / Gradle / Ivy

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JaVers - object auditing and diff framework for Java

There is a newer version: 7.6.2

package org.javers.core.diff.custom;

import org.javers.common.string.Strings;
import org.javers.core.JaversBuilder;

import java.util.Objects;

/**
 * Compares Strings treating blank and null strings as equal.
 * 


 *
 * Usage example:
 *  * JaversBuilder.javers()
 *     .registerValue(String.class, new NullAsBlankStringComparator())
 *     .build();
 * 
 *
 * @see JaversBuilder#registerValue(Class, CustomValueComparator)
 */
public class NullAsBlankStringComparator implements CustomValueComparator {

    @Override
    public boolean equals(String a, String b) {
        return Objects.equals(Strings.emptyIfNull(a).trim(), Strings.emptyIfNull(b).trim());
    }

    @Override
    public String toString(String value) {
        return Strings.emptyIfNull(value).trim();
    }

    @Override
    public boolean handlesNulls() {
        return true;
    }
}