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The coolest XML library for Java around. Define typesafe views (projections) to xml. Use XPath to read and write XML. Bind XML to Java collections. Requires at least Java6, supports Java8 features and has no further runtime dependencies.

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/**
 *  Copyright 2014 Sven Ewald
 *
 *  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.xmlbeam.exceptions;

import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;

import java.lang.reflect.Method;

/**
 * Exception to provide error details related to XPath parsing.
 *
 * @author Sven
 */
public class XBPathException extends XBException {

    private static final long serialVersionUID = -2286603725835988440L;
    private final CharSequence resolvedXpath;

    /**
     * Constructor.
     *
     * @param msg
     * @param method
     * @param xpath
     */
    public XBPathException(final String msg, final Method method, final CharSequence xpath) {
        super(msg + " when invoking " + shortDesc(method) + " [Resolved XPath:'" + xpath + "']");
        this.resolvedXpath = xpath;
        stripStackTrace();
    }

    /**
     * Constructor.
     *
     * @param cause
     * @param method
     * @param xpath
     */
    public XBPathException(final Throwable cause, final Method method, final CharSequence xpath) {
        super("Exception invocating " + shortDesc(method) + " [Resolved XPath:'" + xpath + "']", cause);
        this.resolvedXpath = xpath;
        stripStackTrace();
    }

    /**
     * Constructor.
     *
     * @param cause
     * @param xpath
     */
    public XBPathException(final Throwable cause, final CharSequence xpath) {
        super("Exception evaluating '" + xpath + "'", cause);
        this.resolvedXpath = xpath;
        stripStackTrace();
    }

    private void stripStackTrace() {
        List st = new LinkedList(Arrays.asList(getStackTrace()));
        st.remove(0);
        st.remove(0);
        setStackTrace(st.toArray(new StackTraceElement[st.size()]));
    }

    /**
     * @param method
     * @return
     */
    private static String shortDesc(final Method method) {
        String params = "";
        for (Class c : method.getParameterTypes()) {
            if (!params.isEmpty()) {
                params = ", ";
            }
            params += c.getSimpleName();
        }
        return method.getDeclaringClass().getSimpleName() + "." + method.getName() + "(" + params + ")";
    }

    /**
     * @return the xpath with all parameters filled in.
     */
    public String getResolvedXpath() {
        return resolvedXpath.toString();
    }
}