org.qi4j.runtime.value.ValueInstance.java Source code

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Here is the source code for org.qi4j.runtime.value.ValueInstance.java

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/*
 * Copyright (c) 2007, Rickard berg. All Rights Reserved.
 * Copyright (c) 2007, Niclas Hedhman. All Rights Reserved.
 * Copyright (c) 2007, Alin Dreghiciu. All Rights Reserved.
 *
 * 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.qi4j.runtime.value;

import java.lang.reflect.Proxy;
import org.json.JSONException;
import org.json.JSONStringer;
import org.qi4j.api.property.StateHolder;
import org.qi4j.api.value.ValueComposite;
import org.qi4j.runtime.composite.MixinsInstance;
import org.qi4j.runtime.composite.TransientInstance;
import org.qi4j.runtime.structure.ModuleInstance;
import org.qi4j.spi.composite.CompositeInstance;
import org.qi4j.spi.value.ValueDescriptor;

/**
 * ValueComposite instance
 */
public final class ValueInstance extends TransientInstance implements CompositeInstance, MixinsInstance {
    public static ValueInstance getValueInstance(ValueComposite composite) {
        return (ValueInstance) Proxy.getInvocationHandler(composite);
    }

    public ValueInstance(ValueModel compositeModel, ModuleInstance moduleInstance, Object[] mixins,
            StateHolder state) {
        super(compositeModel, moduleInstance, mixins, state);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || !Proxy.isProxyClass(o.getClass())) {
            return false;
        }

        try {
            ValueInstance that = (ValueInstance) Proxy.getInvocationHandler(o);
            return state.equals(that.state);
        } catch (ClassCastException e) {
            return false;
        }
    }

    @Override
    public ValueDescriptor descriptor() {
        return (ValueDescriptor) compositeModel;
    }

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

    @Override
    public String toString() {
        try {
            JSONStringer stringer = new JSONStringer();
            ((ValueModel) compositeModel).valueType().toJSON(proxy(), stringer);
            return stringer.toString();
        } catch (JSONException e) {
            return super.toString();
        }
    }
}