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javax package » javax » naming » NamingException.java
/* 
 * 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 javax.naming;

import org.apache.harmony.jndi.internal.nls.Messages;

/**
 * A <code>NamingException</code> is the basic exception thrown by the naming
 * classes. There are numerous subclasses of it which are used to further
 * describe the type of error encountered.
 * <p>
 * A <code>NamingException</code> can hold information relating to an error
 * encountered when trying to resolve a <code>Name</code>. It holds the two
 * parts of the original name, firstly the part of the name which was
 * successfully resolved, secondly the part of the name which could not be
 * resolved.
 * </p>
 * <p>
 * For example:<br />
 * ------------<br />
 * The resolved name could be something like http://www.apache.org where jndi
 * has successfully resolved the DNS name. The part of the name which could not
 * be resolved could be something like java/classes.index.html where jndi could
 * not resolve the file name.
 * </p>
 * <p>
 * It can also refer to the object that is associated with the resolved name.
 * </p>
 * <p>
 * Additionally it can refer to another exception, which may be the root cause
 * of this exception.
 * </p>
 * <p>
 * Multithreaded access to a <code>NamingException</code> instance is only
 * safe when client code locks the object first.
 * </p>
 */
public class NamingException extends Exception {

    /*
     * This constant is used during deserialization to check the version which
     * created the serialized object.
     */
    private static final long serialVersionUID = -1299181962103167177L;

    /**
     * The resolved name. This may be null.
     */
    protected Name resolvedName = null;

    /**
     * The remaining name. This may be null.
     */
    protected Name remainingName = null;

    /**
     * The resolved object. This may be null.
     */
    protected Object resolvedObj = null;

    /**
     * The exception that caused this NamingException to be raised. This may be
     * null.
     */
    protected Throwable rootException = null;

    /**
     * Constructs a <code>NamingException</code> instance with all data
     * initialized to null.
     */
    public NamingException() {
        super();
    }

    /**
     * Constructs a <code>NamingException</code> instance with the specified
     * message. All other fields are initialized to null.
     * 
     * @param s
     *            The detail message for the exception. It may be null.
     */
    public NamingException(String s) {
        super(s);
    }

    /**
     * Returns the message passed in as a param to the constructor. This may be
     * null.
     * 
     * @return the message passed in as a param to the constructor.
     */
    public String getExplanation() {
        return super.getMessage();
    }

    /**
     * Appends the supplied string to the <code>Name</code> held as the
     * remaining name. The string may be null.
     * 
     * @param s
     *            the string to append to the remaining Name.
     * @throws IllegalArgumentException
     *             if appending the supplied String s causes the name to become
     *             invalid.
     */
    public void appendRemainingComponent(String s) {
        if (null != s) {
            try {
                if (null == remainingName) {
                    remainingName = new CompositeName(""); //$NON-NLS-1$
                }
                remainingName = remainingName.add(s);
            } catch (InvalidNameException e) {
                // jndi.10=Found invalid name, reason: {0}
                throw new IllegalArgumentException(Messages.getString(
                        "jndi.10", e)); //$NON-NLS-1$
            }
        }
    }

    /**
     * Returns the remaining name. This may be null.
     * 
     * @return the remaining name. This may be null.
     */
    public Name getRemainingName() {
        return remainingName;
    }

    /**
     * Returns the resolved name. This may be null.
     * 
     * @return the resolved name. This may be null.
     */
    public Name getResolvedName() {
        return resolvedName;
    }

    /**
     * Returns the resolved object. This may be null.
     * 
     * @return the resolved object. This may be null.
     */
    public Object getResolvedObj() {
        return resolvedObj;
    }

    /**
     * Sets the resolved name to the specified name. This may be null. The
     * resolved name details must not change even if the original
     * <code>Name</code> itself changes.
     * 
     * @param name
     *            the resolved name to set.
     */
    public void setResolvedName(Name name) {
        resolvedName = null == name ? null : (Name) name.clone();
    }

    /**
     * Sets the remaining name to the specified n. This may be null. The
     * remaining name details must not change even if the original
     * <code>Name</code> itself changes.
     * 
     * @param name
     *            the remaining name to set.
     */
    public void setRemainingName(Name name) {
        remainingName = null == name ? null : (Name) name.clone();
    }

    /**
     * Sets the resolved object to the specified o. This may be null.
     * 
     * @param o
     *            the resolved object to set.
     */
    public void setResolvedObj(Object o) {
        resolvedObj = o;
    }

    /**
     * Appends the elements of the supplied <code>Name</code> n to the
     * <code>Name</code> held as the remaining name. The <code>Name</code> n
     * may be null or may be empty.
     * 
     * @param n
     *            the name to append to the remaining name.
     * @throws IllegalArgumentException
     *             if appending the supplied <code>Name</code> n causes the
     *             name to become invalid.
     */
    public void appendRemainingName(Name n) {
        if (null != n) {
            try {
                if (null == remainingName) {
                    remainingName = new CompositeName(""); //$NON-NLS-1$
                }
                remainingName = remainingName.addAll(n);
            } catch (InvalidNameException e) {
                // jndi.10=Found invalid name, reason: {0}
                throw new IllegalArgumentException(Messages.getString(
                        "jndi.10", e)); //$NON-NLS-1$
            }
        }
    }

    /**
     * Returns the exception which caused this <code>NamingException</code>
     * which may be null.
     * 
     * @return the exception which caused this <code>NamingException</code>
     *         which may be null.
     */
    public Throwable getRootCause() {
        return rootException;
    }

    /**
     * Sets the exception that caused this <code>NamingException</code>. It
     * may be null. Ignore the supplied parameter if it is actually this
     * exception.
     * 
     * @param t
     *            the exception that caused this <code>NamingException</code>.
     */
    public void setRootCause(Throwable t) {
        if (t != this) {
            rootException = t;
        }
    }

    /**
     * Returns the same details as the <code>toString()</code> method except
     * that, if the <code>flag</code> is set to true, then details of the
     * resolved object are also appended to the string. The actual format can be
     * decided by the implementor.
     * 
     * @param flag
     *            Indicates if the resolved object need to be returned.
     * 
     * @return the string representation of this <code>NamingException</code>.
     */
    public String toString(boolean flag) {
        return toStringImpl(flag);
    }

    /*
     * (non-Javadoc)
     * 
     * @see java.lang.Throwable#getCause()
     */
    @Override
    public Throwable getCause() {
        return getRootCause();
    }

    /*
     * (non-Javadoc)
     * 
     * @see java.lang.Throwable#initCause(Throwable)
     */
    @Override
    public Throwable initCause(Throwable cause) {
        super.initCause(cause);
        rootException = cause;
        return this;
    }

    /**
     * Returns the string representation of this <code>NamingException</code>.
     * The string contains the string representation of this exception together
     * with details of the exception which caused this and any remaining portion
     * of the <code>Name</code>.
     * <p>
     * The actual format can be decided by the implementor.
     * </p>
     * 
     * @return the string
     */
    @Override
    public String toString() {
        return this.toStringImpl(false);
    }

    @SuppressWarnings("nls")
    private String toStringImpl(boolean flag) {
        StringBuilder sb = new StringBuilder();
        sb.append(super.toString());
        if (null != rootException) {
            sb.append(" [Root exception is ").append(rootException.toString())
                    .append("]");
        }
        if (null != remainingName) {
            sb.append("; Remaining name: '").append(remainingName.toString())
                    .append("'");
        }
        if (flag && null != resolvedObj) {
            sb.append("; Resolved object: '").append(resolvedObj.toString())
                    .append("'");
        }
        return sb.toString();
    }

}
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