org.mvel2.optimizers.impl.refl.nodes.Union Maven / Gradle / Ivy

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/**
 * MVEL (The MVFLEX Expression Language)
 *
 * Copyright (C) 2007 Christopher Brock, MVFLEX/Valhalla Project and the Codehaus
 *
 * 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.mvel2.optimizers.impl.refl.nodes;

import org.mvel2.ParserContext;
import org.mvel2.compiler.Accessor;
import org.mvel2.integration.VariableResolverFactory;
import org.mvel2.optimizers.AccessorOptimizer;
import org.mvel2.optimizers.OptimizerFactory;

/**
 * @author Christopher Brock
 */
public class Union implements Accessor {

    private Accessor accessor;
    private char[] nextExpr;
    private int start;
    private int offset;
    private Accessor nextAccessor;
    private ParserContext pCtx;

    public Union(ParserContext pCtx, Accessor accessor, char[] nextAccessor, int start, int offset) {
        this.accessor = accessor;
        this.start = start;
        this.offset = offset;
        this.nextExpr = nextAccessor;
        this.pCtx = pCtx;
    }

    public Object getValue(Object ctx, Object elCtx, VariableResolverFactory variableFactory) {
        if (nextAccessor == null) {
            return get(ctx, elCtx, variableFactory);
        } else {
            return nextAccessor.getValue(get(ctx, elCtx, variableFactory), elCtx, variableFactory);
        }
    }

    public Object setValue(Object ctx, Object elCtx, VariableResolverFactory variableFactory, Object value) {
        return nextAccessor.setValue(get(ctx, elCtx, variableFactory), elCtx, variableFactory, value);
    }

    private Object get(Object ctx, Object elCtx, VariableResolverFactory variableFactory) {
        if (nextAccessor == null) {
            Object o = accessor.getValue(ctx, elCtx, variableFactory);
            AccessorOptimizer ao = OptimizerFactory.getDefaultAccessorCompiler();
            Class ingress = accessor.getKnownEgressType();

            nextAccessor = ao.optimizeAccessor(pCtx, nextExpr, start, offset, o, elCtx, variableFactory, false, ingress);
            return ao.getResultOptPass();
        } else {
            return accessor.getValue(ctx, elCtx, variableFactory);
        }
    }

    public Class getLeftIngressType() {
        return accessor.getKnownEgressType();
    }

    public Class getKnownEgressType() {
        return nextAccessor.getKnownEgressType();
    }
}