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/*
 * Copyright 2003-2007 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 groovy.mock.interceptor

/**
 * Intercepting calls to the collaborating object and notify the expectation object.
 *
 * @author Dierk Koenig
 */

class MockInterceptor implements PropertyAccessInterceptor {

    def expectation = null

    def beforeInvoke(Object object, String methodName, Object[] arguments) {
        if (!expectation) throw new IllegalStateException("Property 'expectation' must be set before use.")
        def result = expectation.match(methodName)
        if (result == MockProxyMetaClass.FALL_THROUGH_MARKER) return result
        return result(*arguments)
    }

    def beforeGet(Object object, String property) {
        if (!expectation) throw new IllegalStateException("Property 'expectation' must be set before use.")
        String name = "get${property[0].toUpperCase()}${property[1..-1]}"
        def result = expectation.match(name)
        if (result == MockProxyMetaClass.FALL_THROUGH_MARKER) return result
        return result()
    }

    void beforeSet(Object object, String property, Object newValue) {
        if (!expectation) throw new IllegalStateException("Property 'expectation' must be set before use.")
        String name = "set${property[0].toUpperCase()}${property[1..-1]}"
        def result = expectation.match(name)
        if (result != MockProxyMetaClass.FALL_THROUGH_MARKER) {
            result(newValue)
            result = null
        }
        // object is never used so cheat and use it for return value
        if (object instanceof Object[]) ((Object[])object)[0] = result
    }

    def afterInvoke(Object object, String methodName, Object[] arguments, Object result) {
        return null // never used
    }

    boolean doInvoke() {
        return false // future versions may allow collaborator method calls depending on state
    }
}