BooleanConverterFactory.java

/*****************************************************************************
 * Copyright 2011 Zdenko Vrabel
 *
 * 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.zdevra.guice.mvc.converters;

import java.lang.annotation.Annotation;
import java.util.Map;

import org.zdevra.guice.mvc.ConversionService.Converter;
import org.zdevra.guice.mvc.ConversionService.ConverterFactory;
import org.zdevra.guice.mvc.annotations.BooleanConv;
import org.zdevra.guice.mvc.Utils;

/**
 * The factory create converter which converts boolean values
 */
public class BooleanConverterFactory implements ConverterFactory {

    /**
     * {@inheritDoc}
     *
     * @param type
     * @param annotations
     * @return
     */
    @Override
    public Converter<?> createConverter(Class<?> type, Annotation[] annotations) {
        if ((type == boolean.class) || (type == Boolean.class)) {
            return new BooleanConverter(Utils.getAnnotation(BooleanConv.class, annotations));
        } else if (type == boolean[].class) {
            return new BooleanArrayConverter(Utils.getAnnotation(BooleanConv.class, annotations));
        } else if (type == Boolean[].class) {
            return new BooleanObjArrayConverter(Utils.getAnnotation(BooleanConv.class, annotations));
        }

        return null;
    }

    /**
     * The class provides conversion of string to boolean object
     */
    private static class BooleanConverter extends TypeConverter<Boolean> {

        private final BooleanConv annotation;

        BooleanConverter(BooleanConv annotation) {
            this.annotation = annotation;
        }

        @Override
        protected Boolean convertType(String stringValue) {
            return convertBoolean(stringValue, annotation);
        }
    }

    /**
     * The class provides conversion of string array to boolean (object) array
     */
    private static class BooleanObjArrayConverter implements Converter<Boolean[]> {

        private final BooleanConv annotation;

        BooleanObjArrayConverter(BooleanConv annotation) {
            this.annotation = annotation;
        }

        @Override
        public Boolean[] convert(String name, Map<String, String[]> data) {
            String[] values = data.get(name);
            if (values == null) {
                return new Boolean[]{};
            }

            Boolean[] out = new Boolean[values.length];
            for (int i = 0; i < values.length; ++i) {
                out[i] = convertBoolean(values[i], annotation);
            }

            return out;
        }
    }

    /**
     * The class provides conversion of string array to boolean (object) array
     */
    private static class BooleanArrayConverter implements Converter<boolean[]> {

        private final BooleanConv annotation;

        BooleanArrayConverter(BooleanConv annotation) {
            this.annotation = annotation;
        }

        @Override
        public boolean[] convert(String name, Map<String, String[]> data) {
            String[] values = data.get(name);
            if (values == null) {
                return new boolean[]{};
            }

            boolean[] out = new boolean[values.length];
            for (int i = 0; i < values.length; ++i) {
                out[i] = convertBoolean(values[i], annotation);
            }

            return out;
        }
    }

    /**
     * This is acutally the main conversion method
     */
    private static boolean convertBoolean(String stringValue, BooleanConv annotation) {
        if (annotation != null) {
            if (annotation.trueVal().equalsIgnoreCase(stringValue)) {
                return true;
            } else if (annotation.falseVal().equalsIgnoreCase(stringValue)) {
                return false;
            } else {
                return false;
            }
        }
        return Boolean.parseBoolean(stringValue);
    }
}