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// *  http://www.apache.org/licenses/LICENSE-2.0                                                                             *
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package org.apache.juneau.encoders;

import static org.apache.juneau.internal.CollectionUtils.*;
import static org.apache.juneau.internal.ClassUtils.*;

import java.util.*;

import org.apache.juneau.internal.*;

/**
 * Builder class for creating instances of {@link EncoderGroup}.
 */
public class EncoderGroupBuilder {

	private final List<Encoder> encoders;

	/**
	 * Create an empty encoder group builder.
	 */
	public EncoderGroupBuilder() {
		this.encoders = new ArrayList<>();
	}

	/**
	 * Clone an existing encoder group builder.
	 *
	 * @param copyFrom The encoder group that we're copying settings and encoders from.
	 */
	public EncoderGroupBuilder(EncoderGroup copyFrom) {
		this.encoders = new ArrayList<>();
		addReverse(encoders, copyFrom.getEncoders());
	}

	/**
	 * Registers the specified encoders with this group.
	 *
	 * @param e The encoders to append to this group.
	 * @return This object (for method chaining).
	 */
	public EncoderGroupBuilder append(Class<?>...e) {
		for (int i = e.length-1; i >= 0; i--)
			encoders.add(castOrCreate(Encoder.class, e[i]));
		return this;
	}

	/**
	 * Registers the specified encoders with this group.
	 *
	 * @param e The encoders to append to this group.
	 * @return This object (for method chaining).
	 */
	public EncoderGroupBuilder append(Encoder...e) {
		addReverse(encoders, e);
		return this;
	}

	/**
	 * Registers the specified encoders with this group.
	 *
	 * @param e The encoders to append to this group.
	 * @return This object (for method chaining).
	 */
	public EncoderGroupBuilder append(List<Encoder> e) {
		addReverse(encoders, e);
		return this;
	}

	/**
	 * Registers the encoders in the specified group with this group.
	 *
	 * @param eg The encoders to append to this group.
	 * @return This object (for method chaining).
	 */
	public EncoderGroupBuilder append(EncoderGroup eg) {
		append(eg.getEncoders());
		return this;
	}

	/**
	 * Creates a new {@link EncoderGroup} object using a snapshot of the settings defined in this builder.
	 *
	 * <p>
	 * This method can be called multiple times to produce multiple encoder groups.
	 *
	 * @return A new {@link EncoderGroup} object.
	 */
	public EncoderGroup build() {
		List<Encoder> l = new ArrayList<>();
		for (Object e : encoders)
			l.add(castOrCreate(Encoder.class, e));
		return new EncoderGroup(ArrayUtils.toReverseArray(Encoder.class, l));
	}
}
