/*
 * Copyright 2002-2004 the original author or authors.
 * 
 * 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.springframework.rules.closure;

import org.springframework.rules.NoArgClosure;

public abstract class NoArgBlock extends AbstractClosure implements NoArgClosure {

    public final Object call(Object argument) {
        return call();
    }

    public Object call() {
        handle();
        return NULL_VALUE;
    }

    protected Object handle() {
        throw new UnsupportedOperationException(
                "You must override handle() for a block that returns no value, or "
                        + "override call() for blocks that return a single value");
    }

}
/*
 * Copyright 2002-2004 the original author or authors.
 * 
 * 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.springframework.rules.closure;

import org.springframework.rules.NoArgClosure;

public abstract class NoArgBlock extends AbstractClosure implements
        NoArgClosure {

    public final Object call(Object argument) {
        return call();
    }

    public Object call() {
        handle();
        return NULL_VALUE;
    }

    protected void handle() {
        throw new UnsupportedOperationException(
                "You must override call() for a noArg block that returns a value, or "
                        + "override handle() for a noArg block that returns no value");
    }

}
handle contract was wrong