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The Drools and jBPM public API which is backwards compatible between releases.

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/*
 * Copyright 2015 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * 
 *      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.impl.adapters;

import org.kie.api.runtime.Environment;

public class EnvironmentAdapter implements org.drools.runtime.Environment, org.kie.api.runtime.Environment {

    public final Environment delegate;

    public EnvironmentAdapter(Environment delegate) {
        this.delegate = delegate;
    }

    public Object get(String identifier) {
        return delegate.get(identifier);
    }

    public void set(String identifier, Object object) {
        delegate.set(identifier, object);
    }

    @Override
    public void setDelegate(Environment delegate) {
        setDelegate((org.drools.runtime.Environment) new EnvironmentAdapter(delegate));
    }

    public void setDelegate(org.drools.runtime.Environment delegate) {
        this.delegate.setDelegate(((EnvironmentAdapter)delegate).delegate);
    }

    public Environment getDelegate() {
        return delegate;
    }

    @Override
    public int hashCode() {
        return delegate.hashCode();
    }

    @Override
    public boolean equals(Object obj) {
        return obj instanceof EnvironmentAdapter && delegate.equals(((EnvironmentAdapter)obj).delegate);
    }
}