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XML utility library for JAXB, including functional style to define marshalling and unmarshalling adapters.

There is a newer version: 0.1.2

/*
 * Copyright 2015-2016 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 io.theblackbox.commons.xml;

import io.theblackbox.commons.check.Check;

import javax.xml.bind.annotation.adapters.XmlAdapter;
import java.util.function.Function;

public class XmlFunctionalAdapter
        extends XmlAdapter {

    private final Function unmarshallFunction;
    private final Function marshallFunction;

    protected XmlFunctionalAdapter(Function unmarshallFunction, Function marshallFunction) {
        Check.that(unmarshallFunction);
        Check.that(marshallFunction);
        this.unmarshallFunction = unmarshallFunction;
        this.marshallFunction = marshallFunction;
    }

    @Override
    public B unmarshal(V v) throws Exception {
        return unmarshallFunction.apply(v);
    }

    @Override
    public V marshal(B b) throws Exception {
        return marshallFunction.apply(b);
    }

    public static  XmlFunctionalAdapter marshalling(Function function) {
        return of(notImplementedFunction(), function);
    }

    public static  XmlFunctionalAdapter unmarshalling(Function function) {
        return of(function, notImplementedFunction());
    }

    public static  XmlFunctionalAdapter of(Function unmarshallFunction,
                                                     Function marshallFunction) {
        return new XmlFunctionalAdapter<>(unmarshallFunction, marshallFunction);
    }

    static  Function notImplementedFunction() {
        return (e) -> {
            throw new UnsupportedOperationException("This xml marshall/unmarshall operation has not been implemented");
        };
    }
}