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The Drools and jBPM public API which is backwards compatible between releases.
There is a newer version: 6.5.0.Final
/*
* Copyright 2011 JBoss Inc
*
* 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.drools.builder.conf;

import org.drools.builder.ResultSeverity;

/**
 *
 */
public class KBuilderSeverityOption
    implements
    MultiValueKnowledgeBuilderOption {

    private static final long    serialVersionUID = 1492178699571897026L;
    public static String         PROPERTY_NAME    = "drools.kbuilder.severity.";
    private final String         key;
    private final ResultSeverity severity;

    private KBuilderSeverityOption(String key,
                                   ResultSeverity severity) {
        this.key = key;
        this.severity = severity != null ? severity : ResultSeverity.INFO;
    }

    /* (non-Javadoc)
     * @see java.lang.Object#hashCode()
     */
    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((key == null) ? 0 : key.hashCode());
        result = prime * result + ((severity == null) ? 0 : severity.hashCode());
        return result;
    }

    /* (non-Javadoc)
     * @see java.lang.Object#equals(java.lang.Object)
     */
    @Override
    public boolean equals( Object obj ) {
        if ( this == obj ) return true;
        if ( obj == null ) return false;
        if ( getClass() != obj.getClass() ) return false;
        KBuilderSeverityOption other = (KBuilderSeverityOption) obj;
        if ( key == null ) {
            if ( other.key != null ) return false;
        } else if ( !key.equals( other.key ) ) return false;
        if ( severity != other.severity ) return false;
        return true;
    }

    public String getPropertyName() {
        return PROPERTY_NAME + key;
    }

    public static KBuilderSeverityOption get( String key,
                                              ResultSeverity severity ) {
        return new KBuilderSeverityOption( key,
                                           severity );
    }

    public static KBuilderSeverityOption get( String key,
                                              String severityString ) {
        ResultSeverity sev;
        try {
            sev = ResultSeverity.valueOf( severityString.trim().toUpperCase() );
        } catch ( IllegalArgumentException iae ) {
            sev = ResultSeverity.INFO;
        }
        return new KBuilderSeverityOption( key,
                                           sev );
    }

    public String getName() {
        return key;
    }

    public ResultSeverity getSeverity() {
        return severity;
    }

    @Override
    public String toString() {
        return "KBuilderResultSeverityOption ( name= " + key + " severity=" + severity + ")";
    }

}