/*

 * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.

 */

/*

 * 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 com.sun.org.apache.xpath.internal.jaxp;

import com.sun.org.apache.xpath.internal.objects.XObject;

import javax.xml.namespace.QName;

import javax.xml.transform.TransformerException;

import javax.xml.xpath.XPathConstants;

import javax.xml.xpath.XPathEvaluationResult;

import javax.xml.xpath.XPathExpression;

import javax.xml.xpath.XPathExpressionException;

import javax.xml.xpath.XPathFunctionResolver;

import javax.xml.xpath.XPathVariableResolver;

import jdk.xml.internal.JdkXmlFeatures;

import org.w3c.dom.Document;

import org.xml.sax.InputSource;

/**

 * The XPathExpression interface encapsulates a (compiled) XPath expression.

 *

 * @author  Ramesh Mandava

 */

public class XPathExpressionImpl extends XPathImplUtil implements XPathExpression {

    private com.sun.org.apache.xpath.internal.XPath xpath;

    /** Protected constructor to prevent direct instantiation; use compile()

     * from the context.

     */

    protected XPathExpressionImpl() {

        this(null, null, null, null, false, new JdkXmlFeatures(false));

    };

    protected XPathExpressionImpl(com.sun.org.apache.xpath.internal.XPath xpath,

            JAXPPrefixResolver prefixResolver,

            XPathFunctionResolver functionResolver,

            XPathVariableResolver variableResolver) {

        this(xpath, prefixResolver, functionResolver, variableResolver,

             false, new JdkXmlFeatures(false));

    };

    protected XPathExpressionImpl(com.sun.org.apache.xpath.internal.XPath xpath,

            JAXPPrefixResolver prefixResolver,XPathFunctionResolver functionResolver,

            XPathVariableResolver variableResolver, boolean featureSecureProcessing,

            JdkXmlFeatures featureManager) {

        this.xpath = xpath;

        this.prefixResolver = prefixResolver;

        this.functionResolver = functionResolver;

        this.variableResolver = variableResolver;

        this.featureSecureProcessing = featureSecureProcessing;

        this.overrideDefaultParser = featureManager.getFeature(

                JdkXmlFeatures.XmlFeature.JDK_OVERRIDE_PARSER);

        this.featureManager = featureManager;

    };

    public void setXPath (com.sun.org.apache.xpath.internal.XPath xpath) {

        this.xpath = xpath;

    }

    public Object eval(Object item, QName returnType)

            throws javax.xml.transform.TransformerException {

        XObject resultObject = eval(item, xpath);

        return getResultAsType(resultObject, returnType);

    }

    @Override

    public Object evaluate(Object item, QName returnType)

        throws XPathExpressionException {

        isSupported(returnType);

        try {

            return eval(item, returnType);

        } catch (java.lang.NullPointerException npe) {

            // If VariableResolver returns null Or if we get

            // NullPointerException at this stage for some other reason

            // then we have to reurn XPathException

            throw new XPathExpressionException (npe);

        } catch (javax.xml.transform.TransformerException te) {

            Throwable nestedException = te.getException();

            if (nestedException instanceof javax.xml.xpath.XPathFunctionException) {

                throw (javax.xml.xpath.XPathFunctionException)nestedException;

            } else {

                // For any other exceptions we need to throw

                // XPathExpressionException (as per spec)

                throw new XPathExpressionException(te);

            }

        }

    }

    @Override

    public String evaluate(Object item)

        throws XPathExpressionException {

        return (String)this.evaluate(item, XPathConstants.STRING);

    }

    @Override

    public Object evaluate(InputSource source, QName returnType)

        throws XPathExpressionException {

        isSupported (returnType);

        try {

            Document document = getDocument(source);

            return eval(document, returnType);

        } catch (TransformerException e) {

            throw new XPathExpressionException(e);

        }

    }

    @Override

    public String evaluate(InputSource source)

        throws XPathExpressionException {

        return (String)this.evaluate(source, XPathConstants.STRING);

    }

    @Override

    public <T>T evaluateExpression(Object item, Class<T> type)

        throws XPathExpressionException {

        isSupportedClassType(type);

        try {

            XObject resultObject = eval(item, xpath);

            if (type.isAssignableFrom(XPathEvaluationResult.class)) {

                return getXPathResult(resultObject, type);

            } else {

                return XPathResultImpl.getValue(resultObject, type);

            }

        } catch (javax.xml.transform.TransformerException te) {

            throw new XPathExpressionException(te);

        }

    }

    @Override

    public XPathEvaluationResult<?> evaluateExpression(Object item)

        throws XPathExpressionException {

        return evaluateExpression(item, XPathEvaluationResult.class);

    }

    @Override

    public <T>T  evaluateExpression(InputSource source, Class<T> type)

            throws XPathExpressionException {

        Document document = getDocument(source);

        return evaluateExpression(document, type);

    }

    @Override

    public XPathEvaluationResult<?> evaluateExpression(InputSource source)

        throws XPathExpressionException {

        return evaluateExpression(source, XPathEvaluationResult.class);

    }

 }