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There is a newer version: 5.0.0-B07

package org.eclipse.persistence.internal.xr;

import java.util.HashMap;
import java.util.Map;

import org.eclipse.persistence.exceptions.DynamicException;

public class XRFieldInfo {

    protected HashMap fieldInfo = new HashMap();

    public XRFieldInfo() {
        super();
    }

    public int numFields() {
        return fieldInfo.size();
    }

    public void addFieldInfo(String fieldName, int idx) {
        fieldInfo.put(fieldName, new Index(idx));
    }

    public int getFieldIdx(String fieldName) {
        Index i = fieldInfo.get(fieldName);
        if (i == null) {
            throw DynamicException.invalidPropertyName(null, fieldName);
        }
        return i.idx;
    }

    public String getFieldName(int fieldIdx) {
        String fieldName = null;
        for (Map.Entry me : fieldInfo.entrySet()) {
            if (me.getValue().idx == fieldIdx) {
                fieldName = me.getKey();
                break;
            }
        }
        return fieldName;
    }

    class Index {
        int idx;
        public Index(int idx) {
            this.idx = idx;
        }
    }
}