/*
 * Copyright 2006-2007 the original author or authors.
 *
 * Licensed 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.springframework.ws.wsdl.wsdl11;

import java.io.IOException;
import javax.xml.transform.Source;

import org.springframework.beans.factory.InitializingBean;
import org.springframework.core.io.Resource;
import org.springframework.util.Assert;
import org.springframework.ws.wsdl.WsdlDefinitionException;
import org.springframework.xml.transform.ResourceSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.XMLReaderFactory;

/**
 * The default {@link Wsdl11Definition} implementation.
 * <p/>
 * Allows a WSDL to be set by the {@link #setWsdl wsdl} property, or directly in the {@link
 * #SimpleWsdl11Definition(Resource) constructor}.
 *
 * @author Arjen Poutsma
 * @since 1.0.0
 */
public class SimpleWsdl11Definition implements Wsdl11Definition, InitializingBean {

    private Resource wsdlResource;

    /**
     * Create a new instance of the {@link SimpleWsdl11Definition} class.
     * <p/>
     * A subsequent call to the {@link #setWsdl(Resource)} method is required.
     */
    public SimpleWsdl11Definition() {
    }

    /**
     * Create a new instance of the  {@link SimpleWsdl11Definition} class with the specified resource.
     *
     * @param wsdlResource the WSDL resource; must not be <code>null</code>
     * @throws IllegalArgumentException if the supplied <code>wsdlResource</code> is <code>null</code>
     */
    public SimpleWsdl11Definition(Resource wsdlResource) {
        Assert.notNull(wsdlResource, "wsdlResource must not be null");
        this.wsdlResource = wsdlResource;
    }

    public void afterPropertiesSet() throws Exception {
        Assert.notNull(this.wsdlResource, "wsdl is required");
        Assert.isTrue(this.wsdlResource.exists(), "wsdl '" + this.wsdlResource + "' does not exit");
    }

    public Source getSource() {
        try {
            XMLReader xmlReader = XMLReaderFactory.createXMLReader();
            xmlReader.setFeature("http://xml.org/sax/features/namespace-prefixes", true);
            return new ResourceSource(xmlReader, wsdlResource);
        }
        catch (SAXException ex) {
            throw new WsdlDefinitionException("Could not create XMLReader", ex);
        }
        catch (IOException ex) {
            throw new WsdlDefinitionException("Could not create source from " + this.wsdlResource, ex);
        }
    }

    /**
     * Set the WSDL resource to be exposed by calls to this instances' {@link #getSource()} method.
     *
     * @param wsdlResource the WSDL resource
     */
    public void setWsdl(Resource wsdlResource) {
        this.wsdlResource = wsdlResource;
    }

}