/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.camel.processor.validation;

import java.io.InputStream;
import java.io.Reader;

import org.w3c.dom.ls.LSInput;
import org.w3c.dom.ls.LSResourceResolver;

import org.xml.sax.InputSource;

import org.apache.xml.resolver.tools.CatalogResolver;

public class CatalogLSResourceResolver implements LSResourceResolver {

	CatalogResolver catalogResolver;

	public CatalogLSResourceResolver() {
	}

	public CatalogLSResourceResolver(CatalogResolver catalogResolver) {
		this.catalogResolver = catalogResolver;
	}

	public CatalogResolver getCatalogResolver() {
		return catalogResolver;
	}

	public void setCatalogResolver(CatalogResolver catalogResolver) {
		this.catalogResolver = catalogResolver;
	}

	@Override
	public LSInput resolveResource(String type, String namespaceURI, String publicId, String systemId, String baseURI) {
		return new LSInputSource(namespaceURI, publicId, systemId, baseURI);
	}

	class LSInputSource implements LSInput {
		private InputSource inputSource;
		private String publicId;
		private String systemId;
		private String baseURI;

		LSInputSource(String namespaceURI, String publicId, String systemId, String baseURI) {
			if (publicId == null) {
				publicId = namespaceURI;
			}

			this.publicId = publicId;
			this.systemId = systemId;
			this.baseURI = baseURI;

			if (catalogResolver == null) {
				throw new IllegalStateException("catalogResolver must be provided");
			}

			this.inputSource = catalogResolver.resolveEntity(publicId, systemId);
		}

		@Override
		public Reader getCharacterStream() {
			return null;
		}

		@Override
		public void setCharacterStream(Reader characterStream) {
			// noop
		}

		@Override
		public InputStream getByteStream() {
			return inputSource != null ? inputSource.getByteStream() : null;
		}

		@Override
		public void setByteStream(InputStream byteStream) {
			if (inputSource != null) {
				inputSource.setByteStream(byteStream);
			}
		}

		@Override
		public String getStringData() {
			return null;
		}

		@Override
		public void setStringData(String stringData) {
			// noop
		}

		@Override
		public String getSystemId() {
			if (inputSource != null) {
				return inputSource.getSystemId();
			}

			return systemId;
		}

		@Override
		public void setSystemId(String systemId) {
			if (inputSource != null) {
				inputSource.setSystemId(systemId);
			}
		}

		@Override
		public String getPublicId() {
			if (inputSource != null) {
				return inputSource.getPublicId();
			}

			return publicId;
		}

		@Override
		public void setPublicId(String publicId) {
			if (inputSource != null) {
				inputSource.setPublicId(publicId);
			} else {
				this.publicId = publicId;
			}
		}

		@Override
		public String getBaseURI() {
			return baseURI;
		}

		@Override
		public void setBaseURI(String baseURI) {
			// noop
		}

		@Override
		public String getEncoding() {
			if (inputSource != null) {
				return inputSource.getEncoding();
			}

			return null;
		}

		@Override
		public void setEncoding(String encoding) {
			if (inputSource != null) {
				inputSource.setEncoding(encoding);
			}
		}

		@Override
		public boolean getCertifiedText() {
			return true;
		}

		@Override
		public void setCertifiedText(boolean certifiedText) {
			// noop
		}
	}
}
