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 *  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
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 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
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package org.apache.cayenne.validation;

/**
 * Represents a generic validation failure that contains
 * failed object and a message describing the failure.
 * 
 * @since 1.1
 * @author Andrus Adamchik
 */
public class SimpleValidationFailure implements ValidationFailure {
    protected Object source;
    protected Object error;

    public SimpleValidationFailure(Object source, Object error) {
        this.source = source;
        this.error = error;
    }

    /**
     * Returns the error converted to String.
     */
    public String getDescription() {
        return String.valueOf(error);
    }

    /**
     * Returns object that failed the validation.
     */
    public Object getSource() {
        return source;
    }

    public Object getError() {
        return error;
    }

    /**
     * Returns a String representation of the failure.
     */
    @Override
    public String toString() {
        StringBuilder buffer = new StringBuilder();

        buffer.append("Validation failure for ");
        Object source = getSource();

        if (source == null) {
            buffer.append("[General]");
        }
        else {
            String sourceLabel = (source instanceof String) ? source.toString() : source
                    .getClass()
                    .getName();
            buffer.append(sourceLabel);
        }
        buffer.append(": ");
        buffer.append(getDescription());
        return buffer.toString();
    }
}
