org.javelin.sws.ext.bind.internal.metadata.PeelingFormatter.java Source code

Introduction

Here is the source code for org.javelin.sws.ext.bind.internal.metadata.PeelingFormatter.java

Source

/*
 * Copyright 2005-2013 the original author or authors.
 *
 * 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.javelin.sws.ext.bind.internal.metadata;

import java.io.StringWriter;
import java.text.ParseException;
import java.util.Collection;
import java.util.Locale;

import org.springframework.format.Formatter;

/**
 * <p>A wrapper formatter which prints the object by printing the nested property of that object using delegate {@link Formatter}</p>
 *
 * @author Grzegorz Grzybek
 * @param <T> a type of formatted object
 * @param <P> a type of formatted property of that object
 */
class PeelingFormatter<T, P> implements Formatter<T> {
    private PropertyMetadata<T, P> metadata;

    private Formatter<P> nestedFormatter;

    /**
     * @param field
     * @param nested
     */
    public PeelingFormatter(PropertyMetadata<T, P> metadata, Formatter<P> nestedFormatter) {
        this.metadata = metadata;
        this.nestedFormatter = nestedFormatter;
    }

    /**
     * @param pm
     * @param nested
     * @return
     */
    @SuppressWarnings("unchecked")
    public static <T, P> PeelingFormatter<T, P> newPeelingFormatter(PropertyMetadata<T, ?> metadata,
            Formatter<?> nestedFormatter) {
        return new PeelingFormatter<T, P>((PropertyMetadata<T, P>) metadata, (Formatter<P>) nestedFormatter);
    }

    @Override
    public String print(T object, Locale locale) {
        // TODO: object should not be null!

        P value = this.metadata.getValue(object);
        if (this.metadata.isCollectionProperty()) {
            @SuppressWarnings("unchecked")
            Collection<P> col = (Collection<P>) value;
            if (col.size() == 0)
                return "";
            StringWriter sb = new StringWriter();
            for (P el : col) {
                if (el != null)
                    sb.append(' ').append(
                            this.nestedFormatter == null ? el.toString() : this.nestedFormatter.print(el, locale));
            }
            return sb.toString().substring(1);
        } else {
            return this.nestedFormatter == null ? value.toString() : this.nestedFormatter.print(value, locale);
        }
    }

    @Override
    public T parse(String text, Locale locale) throws ParseException {
        return null;
    }
}