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/*   Copyright 2004 The Apache Software Foundation
 *
 *   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.apache.xmlbeans;

import java.util.List;
import java.util.Collections;
import java.util.Collection;
import java.util.ArrayList;

/**
 * A checked exception that can be thrown while processing,
 * parsing, or compiling XML.  May contain any number of {@link XmlError}
 * objects.
 * 
 * @see XmlError
 * @see XmlRuntimeException
 */
public class XmlException extends Exception
{
    private static final long serialVersionUID = 1L;
    
    /**
     * Constructs an XmlException from a message.
     */ 
    public XmlException ( String m              ) { super( m );    }
    
    /**
     * Constructs an XmlException from a message and a cause.
     */ 
    public XmlException ( String m, Throwable t ) { super( m, t ); }
    
    /**
     * Constructs an XmlException from a cause.
     */ 
    public XmlException ( Throwable t           ) { super( t );    }
    
    /**
     * Constructs an XmlException from an {@link XmlError}.
     */ 
    public XmlException ( XmlError error )
    {
        this( error.toString(), null, error );
    }

    /**
     * Constructs an XmlException from a message, a cause, and an {@link XmlError}.
     */ 
    public XmlException ( String m, Throwable t, XmlError error )
    {
        this( m, t, Collections.singletonList( error ) );
    }
    
    /**
     * Constructs an XmlException from a message, a cause, and a collection of {@link XmlError XmlErrors}.
     */ 
    public XmlException ( String m, Throwable t, Collection errors )
    {
        super( m, t );

        if (errors != null)
            _errors = Collections.unmodifiableList( new ArrayList( errors ) );
    }

    /**
     * Constructs an XmlException from an {@link XmlRuntimeException}.
     */ 
    public XmlException ( XmlRuntimeException xmlRuntimeException )
    {
        super(
            xmlRuntimeException.getMessage(), xmlRuntimeException.getCause() );

        Collection errors = xmlRuntimeException.getErrors();

        if (errors != null)
            _errors = Collections.unmodifiableList( new ArrayList( errors ) );
    }
    
    /**
     * Returns the first {@link XmlError XmlErrors} that caused the exception, if any.
     */ 
    public XmlError getError ( )
    {
        if (_errors == null || _errors.size() == 0)
            return null;

        return (XmlError) _errors.get( 0 );
    }
    
    /**
     * Returns the collection of {@link XmlError XmlErrors} that caused the exception, if any.
     */ 
    public Collection getErrors ( )
    {
        return _errors;
    }

    private List _errors;
}