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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.ibatis.ognl;

import org.apache.ibatis.ognl.enhance.OrderedReturn;
import org.apache.ibatis.ognl.enhance.UnsupportedCompilationException;

public class ASTVarRef extends SimpleNode implements NodeType, OrderedReturn {

    private static final long serialVersionUID = -4497407745162564648L;

    private String name;

    protected Class getterClass;
    protected String core;
    protected String last;

    public ASTVarRef(int id) {
        super(id);
    }

    public ASTVarRef(OgnlParser p, int id) {
        super(p, id);
    }

    void setName(String name) {
        this.name = name;
    }

    protected Object getValueBody(OgnlContext context, Object source)
            throws OgnlException {
        return context.get(name);
    }

    protected void setValueBody(OgnlContext context, Object target, Object value)
            throws OgnlException {
        context.put(name, value);
    }

    public Class getGetterClass() {
        return getterClass;
    }

    public Class getSetterClass() {
        return null;
    }

    public String getCoreExpression() {
        return core;
    }

    public String getLastExpression() {
        return last;
    }

    public String toString() {
        return "#" + name;
    }

    public String toGetSourceString(OgnlContext context, Object target) {
        Object value = context.get(name);

        if (value != null) {
            getterClass = value.getClass();
        }

        context.setCurrentType(getterClass);
        context.setCurrentAccessor(context.getClass());

        context.setCurrentObject(value);

        if (context.getCurrentObject() == null) {
            throw new UnsupportedCompilationException("Current context object is null, can't compile var reference.");
        }

        String pre = "";
        String post = "";
        if (context.getCurrentType() != null) {
            pre = "((" + OgnlRuntime.getCompiler().getInterfaceClass(context.getCurrentType()).getName() + ")";
            post = ")";
        }

        if (parent instanceof ASTAssign) {
            core = "$1.put(\"" + name + "\",";
            last = pre + "$1.get(\"" + name + "\")" + post;

            return core;
        }

        return pre + "$1.get(\"" + name + "\")" + post;
    }

    public String toSetSourceString(OgnlContext context, Object target) {
        return toGetSourceString(context, target);
    }
}