CaseInsensitiveMap.java

package com.txtr.hibernatedelta.util;

import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;

/**
 * A simple map delegate that stores and retrieves map keys in a case-insensitive fashion.
 * @author nico
 */
public class CaseInsensitiveMap {
    private final Map<String, String> map;

    public CaseInsensitiveMap() {
        map = new LinkedHashMap<String, String>();
    }

    public CaseInsensitiveMap(final CaseInsensitiveMap copyFrom) {
        map = new LinkedHashMap<String, String>(copyFrom.map);
    }

    public final String get(final String key) {
        return map.get(key.toLowerCase());
    }

    public final String put(final String key, final String value) {
        return map.put(key.toLowerCase(), value);
    }

    /**
     * @return the entries with lower case keys
     */
    public final Set<Map.Entry<String, String>> entrySet() {
        return map.entrySet();
    }

    /**
     * @return the lower case keys
     */
    public Set<String> keySet() {
        return map.keySet();
    }

    @Override
    public final boolean equals(final Object other) {
        if (other != null && other instanceof CaseInsensitiveMap) {
            return map.equals(((CaseInsensitiveMap) other).map);
        } else {
            return false;
        }
    }

    @Override
    public final int hashCode() {
        return map.hashCode();
    }

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