org.adjective.stout.operation.GetFieldExpression.java Source code

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Here is the source code for org.adjective.stout.operation.GetFieldExpression.java

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/* ------------------------------------------------------------------------
 * Copyright 2009 Tim Vernum
 * ------------------------------------------------------------------------
 * 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.adjective.stout.operation;

import org.objectweb.asm.Opcodes;

import org.adjective.stout.core.ExecutionStack;
import org.adjective.stout.core.InstructionCollector;
import org.adjective.stout.core.UnresolvedType;
import org.adjective.stout.instruction.FieldInstruction;

/**
 * @author <a href="http://blog.adjective.org/">Tim Vernum</a>
 */
public class GetFieldExpression extends SmartExpression implements Expression {
    private final Expression _target;
    private final UnresolvedType _from;
    private final String _name;
    private final UnresolvedType _type;

    public GetFieldExpression(Expression target, UnresolvedType from, String name, UnresolvedType type) {
        _target = target;
        _from = from;
        _name = name;
        _type = type;
    }

    public GetFieldExpression(String name, UnresolvedType type) {
        this(ThisExpression.INSTANCE, null, name, type);
    }

    public UnresolvedType getExpressionType(ExecutionStack stack) {
        return _type;
    }

    public void getInstructions(ExecutionStack stack, InstructionCollector collector) {
        _target.getInstructions(stack, collector);
        String from = (_from == null ? stack.currentClass().getInternalName() : _from.getInternalName());
        addInstruction(collector, new FieldInstruction(Opcodes.GETFIELD, from, _name, _type.getDescriptor()));
    }
}