io.katharsis.meta.model.MetaAttributePath Maven / Gradle / Ivy

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package io.katharsis.meta.model;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

public class MetaAttributePath implements Iterable {

	public static final char PATH_SEPARATOR_CHAR = '.';

	public static final String PATH_SEPARATOR = ".";

	public static final MetaAttributePath EMPTY_PATH = new MetaAttributePath();

	private MetaAttribute[] pathElements;

	public MetaAttributePath(List pathElements) {
		this(pathElements.toArray(new MetaAttribute[pathElements.size()]));
	}

	public MetaAttributePath(MetaAttribute... pathElements) {
		if (pathElements == null) {
			throw new IllegalArgumentException("pathElements must not be null.");
		}
		this.pathElements = pathElements;
	}

	public MetaAttributePath subPath(int startIndex) {
		MetaAttribute[] range = Arrays.copyOfRange(pathElements, startIndex, pathElements.length);
		return new MetaAttributePath(range);
	}

	public MetaAttributePath subPath(int startIndex, int endIndex) {
		MetaAttribute[] range = Arrays.copyOfRange(pathElements, startIndex, endIndex);
		return new MetaAttributePath(range);
	}

	protected MetaAttribute[] newArray(int length) {
		return new MetaAttribute[length];
	}

	protected MetaAttributePath to(MetaAttribute... pathElements) {
		return new MetaAttributePath(pathElements);
	}

	public int length() {
		return pathElements.length;
	}

	public MetaAttribute getElement(int index) {
		return pathElements[index];
	}

	public MetaAttribute getLast() {
		if (pathElements != null && pathElements.length > 0) {
			return pathElements[pathElements.length - 1];
		}
		return null;
	}

	public MetaAttributePath concat(MetaAttribute... pathElements) {
		ArrayList list = new ArrayList<>();
		list.addAll(Arrays.asList(this.pathElements));
		list.addAll(Arrays.asList(pathElements));
		return to(list.toArray(newArray(0)));
	}

	public String render(String delimiter) {
		if (pathElements.length == 0) {
			return "";
		}
		else if (pathElements.length == 1) {
			return pathElements[0].getName();
		}
		else {
			StringBuilder builder = new StringBuilder(pathElements[0].getName());
			for (int i = 1; i < pathElements.length; i++) {
				builder.append(delimiter);
				builder.append(pathElements[i].getName());
			}
			return builder.toString();
		}
	}

	@Override
	public String toString() {
		return render(PATH_SEPARATOR);
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + Arrays.hashCode(pathElements);
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (obj instanceof MetaAttributePath) {
			MetaAttributePath other = (MetaAttributePath) obj;
			return Arrays.equals(pathElements, other.pathElements);
		}
		return false;
	}

	@Override
	public Iterator iterator() {
		return Collections.unmodifiableList(Arrays.asList(pathElements)).iterator();
	}
}