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Commons Attributes example source code file (DefaultSealable.java)

This example Commons Attributes source code file (DefaultSealable.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons Attributes tags/keywords

defaultsealable, defaultsealable, illegalstateexception, illegalstateexception, sealable, sealable, sealedattributeexception, sealedattributeexception

The Commons Attributes DefaultSealable.java source code

/*
 * Copyright 2003-2004 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.commons.attributes;

/**
 * Implementation of the {@link Sealable} interface. Subclasses should call
 * {@link #checkSealed()} before setting any bean properties.
 *
 * @since 2.1
 */
public class DefaultSealable implements Sealable {
    
    /**
     * Boolean flag indicating whether the {@link seal()} method
     * has been called.
     */
    private volatile boolean sealed = false;
    
    /** 
     * Default ctor.
     */
    public DefaultSealable () {
    }
    
    /**
     * Checks if the {@link #seal()} method has been called and throws a
     * <code>IllegalStateException if it has.
     *
     * @throws IllegalStateException if this attribute has been sealed.
     *
     * @since 2.1
     */
    protected void checkSealed () throws IllegalStateException {
        if (sealed) {
            throw new SealedAttributeException ();
        }
    }
    
    /**
     * Seals this attribute. Any future calls to the
     * {@link #checkSealed()} method will result in an 
     * <code>IllegalStateException being thrown.
     *
     * @since 2.1
     */
    public void seal () {
        this.sealed = true;
    }
}

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