org.mvel2.conversion.BooleanCH Maven / Gradle / Ivy

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/**
 * MVEL 2.0
 * Copyright (C) 2007 The Codehaus
 * Mike Brock, Dhanji Prasanna, John Graham, Mark Proctor
 *
 * 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.mvel2.conversion;

import static java.lang.String.valueOf;

import java.math.BigDecimal;
import java.util.HashMap;
import java.util.Map;

import org.mvel2.ConversionException;
import org.mvel2.ConversionHandler;

public class BooleanCH implements ConversionHandler {

    private static final Map CNV = new HashMap();

    private static Converter stringConverter = new Converter() {

        public Object convert(Object o) {
            return !(((String) o).equalsIgnoreCase("false") || (((String) o).equalsIgnoreCase("no"))
                    || (((String) o).equalsIgnoreCase("off")) || ("0".equals(o)) || ("".equals(o)));
        }
    };

    static {
        CNV.put(String.class, stringConverter);

        CNV.put(Object.class, new Converter() {

            public Object convert(Object o) {
                return stringConverter.convert(valueOf(o));
            }
        });

        CNV.put(Boolean.class, new Converter() {

            public Object convert(Object o) {
                return o;
            }
        });

        CNV.put(Integer.class, new Converter() {

            public Boolean convert(Object o) {
                return (((Integer) o) > 0);
            }
        });

        CNV.put(Float.class, new Converter() {

            public Boolean convert(Object o) {
                return (((Float) o) > 0);
            }
        });

        CNV.put(Double.class, new Converter() {

            public Boolean convert(Object o) {
                return (((Double) o) > 0);
            }
        });

        CNV.put(Short.class, new Converter() {

            public Boolean convert(Object o) {
                return (((Short) o) > 0);
            }
        });

        CNV.put(Long.class, new Converter() {

            public Boolean convert(Object o) {
                return (((Long) o) > 0);
            }
        });

        CNV.put(boolean.class, new Converter() {

            public Boolean convert(Object o) {
                return Boolean.valueOf((Boolean) o);
            }
        });

        CNV.put(BigDecimal.class, new Converter() {

            public Boolean convert(Object o) {
                return Boolean.valueOf(((BigDecimal) o).doubleValue() > 0);
            }
        });

    }

    public Object convertFrom(Object in) {
        if (!CNV.containsKey(in.getClass()))
            throw new ConversionException("cannot convert type: " + in.getClass().getName() + " to: " + Boolean.class.getName());
        return CNV.get(in.getClass()).convert(in);
    }

    public boolean canConvertFrom(Class cls) {
        return CNV.containsKey(cls);
    }
}