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XeTransform.java
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XeTransform.java
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/*
* The MIT License (MIT)
*
* Copyright (c) 2014-2019 Yegor Bugayenko
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package org.takes.rs.xe;
import java.io.IOException;
import java.util.Iterator;
import lombok.EqualsAndHashCode;
/**
* Iterable to transform an iterable of some objects
* into an iterable of Xembly sources.
*
* <p>Use this class to create a collection of
* {@link org.takes.rs.xe.XeSource} objects and pass them to,
* for example, {@link org.takes.rs.xe.XeAppend}:
*
* <pre> return new RsXembly(
* new XeAppend(
* "books",
* new XeTransform<Book>(
* this.database.books(),
* new XeTransform.Func<Book>() {
* @Override
* public XeSource transform(final Book book) {
* return new XeAppend(
* "book",
* new XeDirectives(
* new Directives()
* .add("book")
* .attr("isbn", book.isbn());
* )
* )
* }
* }
* )
* )
* );</pre>
*
* <p>The class is immutable and thread-safe.
*
* @since 0.1
* @param <T> Type of item
*/
@EqualsAndHashCode
public final class XeTransform<T> implements Iterable<XeSource> {
/**
* Iterable of objects.
*/
private final Iterable<T> objects;
/**
* Function to use for mapping.
*/
private final XeTransform.Func<T> func;
/**
* Ctor.
* @param list List of objects
* @param fnc Function
*/
public XeTransform(final Iterable<T> list, final XeTransform.Func<T> fnc) {
this.objects = list;
this.func = fnc;
}
@Override
public Iterator<XeSource> iterator() {
final Iterator<T> origin = this.objects.iterator();
return new Iterator<XeSource>() {
@Override
public boolean hasNext() {
return origin.hasNext();
}
@Override
public XeSource next() {
return XeTransform.this.func.transform(origin.next());
}
@Override
public void remove() {
origin.remove();
}
};
}
/**
* Function to map them.
* @param <T> Type of item
* @since 0.1
*/
public interface Func<T> {
/**
* Transform an object.
* @param obj Object
* @return Xembly source
*/
XeSource transform(T obj);
}
}