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/*
 * Copyright 2004-2015 the Seasar Foundation and the Others.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.seasar.framework.conversion;

/**
 * {@link Boolean}用の変換ユーティリティです。
 * 
 * @author higa
 * 
 */
public class BooleanConversionUtil {

    /**
     * インスタンスを構築します。
     */
    protected BooleanConversionUtil() {
    }

    /**
     * {@link Boolean}に変換します。
     * 
     * @param o o
     * @return {@link Boolean}
     */
    public static Boolean toBoolean(Object o) {
        if (o == null) {
            return null;
        } else if (o instanceof Boolean) {
            return (Boolean) o;
        } else if (o instanceof Number) {
            int num = ((Number) o).intValue();
            return Boolean.valueOf(num != 0);
        } else if (o instanceof String) {
            String s = (String) o;
            if ("true".equalsIgnoreCase(s)) {
                return Boolean.TRUE;
            } else if ("false".equalsIgnoreCase(s)) {
                return Boolean.FALSE;
            } else if (s.equals("0")) {
                return Boolean.FALSE;
            } else {
                return Boolean.TRUE;
            }
        } else {
            return Boolean.TRUE;
        }
    }

    /**
     * booleanに変換します。
     * 
     * @param o o
     * @return boolean
     */
    public static boolean toPrimitiveBoolean(Object o) {
        Boolean b = toBoolean(o);
        if (b != null) {
            return b.booleanValue();
        }
        return false;
    }
}