AbstractJsonNode.java

/**
 * Copyright (C) 2012-2014 Gist Labs, LLC. (http://gistlabs.com)
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
package com.gistlabs.mechanize.document.json.node.impl;

import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import com.gistlabs.mechanize.document.json.exceptions.JsonArrayException;
import com.gistlabs.mechanize.document.json.exceptions.JsonException;
import com.gistlabs.mechanize.document.json.node.JsonNode;
import com.gistlabs.mechanize.document.node.AbstractNode;
import com.gistlabs.mechanize.util.css_query.NodeSelector;

public abstract class AbstractJsonNode extends AbstractNode implements JsonNode {
	protected final String name;
	protected final JsonNode parent;

	public AbstractJsonNode(final JsonNode parent, final String name) {
		this.parent = parent;
		this.name = name;
	}

	@Override
	public String toString() {
		return String.format("%s(%s)", getName(), join(getAttributeNames(),","));
	}

	static String join(final Collection<?> s, final String delimiter) {
		StringBuilder builder = new StringBuilder();
		Iterator<?> iter = s.iterator();
		while (iter.hasNext()) {
			builder.append(iter.next());
			if (!iter.hasNext())
				break;
			builder.append(delimiter);
		}
		return builder.toString();
	}

	@Override
	public String getName() {
		return this.name;
	}

	@Override
	public JsonNode getParent() {
		return this.parent;
	}

	@Override
	public List<? extends JsonNode> getChildren() {
		return Collections.emptyList();
	}

	@SuppressWarnings("unchecked")
	@Override
	public NodeSelector<JsonNode> buildNodeSelector() {
		return (NodeSelector<JsonNode>) super.buildNodeSelector();
	}
	protected JsonNode factory(final JSONObject node, final String key) {
		try {
			if (!node.has(key))
				return null;

			Object obj = node.get(key);

			if (obj instanceof JSONObject)
				return new ObjectNodeImpl(this, key, (JSONObject)obj);
			else if (obj instanceof JSONArray)
				throw new JsonArrayException("Can't access a single array entry without index", (JSONArray)obj);
			else
				return new AttributeNode(this, key);
		} catch (JSONException e) {
			throw new JsonException(e);
		}
	}

	protected JsonNode factory(final String key, final Object obj, final JSONArray array, final int index) {
		if (obj instanceof JSONObject)
			return new ObjectNodeImpl(this, key, (JSONObject)obj);
		else if (obj instanceof JSONArray)
			return new ArrayNodeImpl(this, key, (JSONArray)obj);//throw new JsonArrayException("Can't access a single array entry without index", (JSONArray)obj);
		else
			return new IndexedAttributeNode(this, key, array, index);
	}
}