org.apache.ibatis.ognl.ASTStaticField Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of mybatis Show documentation
The MyBatis SQL mapper framework makes it easier to use a relational database with object-oriented applications. MyBatis couples objects with stored procedures or SQL statements using a XML descriptor or annotations. Simplicity is the biggest advantage of the MyBatis data mapper over object relational mapping tools.
The newest version!
/*
 * 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 java.lang.reflect.Field;
import java.lang.reflect.Modifier;

public class ASTStaticField extends SimpleNode implements NodeType {

    private static final long serialVersionUID = -6421261547066021884L;

    private String className;
    private String fieldName;
    private Class getterClass;

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

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

    /**
     * Called from parser action.
     */
    void init(String className, String fieldName) {
        this.className = className;
        this.fieldName = fieldName;
    }

    protected Object getValueBody(OgnlContext context, Object source) throws OgnlException {
        return OgnlRuntime.getStaticField(context, className, fieldName);
    }

    public boolean isNodeConstant(OgnlContext context)
            throws OgnlException {
        boolean result = false;
        Exception reason = null;

        try {
            Class c = OgnlRuntime.classForName(context, className);

            /*
             * Check for virtual static field "class"; this cannot interfere with normal static
             * fields because it is a reserved word. It is considered constant.
             */
            if (fieldName.equals("class")) {
                result = true;
            } else if (c.isEnum()) {
                result = true;
            } else {
                Field f = OgnlRuntime.getField(c, fieldName);
                if (f == null) {
                    throw new NoSuchFieldException(fieldName);
                }

                if (!Modifier.isStatic(f.getModifiers()))
                    throw new OgnlException("Field " + fieldName + " of class " + className + " is not static");

                result = Modifier.isFinal(f.getModifiers());
            }
        } catch (ClassNotFoundException | NoSuchFieldException | SecurityException e) {
            reason = e;
        }

        if (reason != null)
            throw new OgnlException("Could not get static field " + fieldName
                    + " from class " + className, reason);

        return result;
    }

    private Class getFieldClass(OgnlContext context) throws OgnlException {
        Exception reason;
        try {
            Class c = OgnlRuntime.classForName(context, className);

            /*
             * Check for virtual static field "class"; this cannot interfere with normal static
             * fields because it is a reserved word. It is considered constant.
             */
            if (fieldName.equals("class")) {
                return c;
            } else if (c.isEnum()) {
                return c;
            } else {
                Field f = c.getField(fieldName);

                return f.getType();
            }
        } catch (ClassNotFoundException | NoSuchFieldException | SecurityException e) {
            reason = e;
        }

        throw new OgnlException("Could not get static field " + fieldName + " from class " + className, reason);
    }

    public Class getGetterClass() {
        return getterClass;
    }

    public Class getSetterClass() {
        return getterClass;
    }

    public String toString() {
        return "@" + className + "@" + fieldName;
    }

    public String toGetSourceString(OgnlContext context, Object target) {
        try {
            Object obj = OgnlRuntime.getStaticField(context, className, fieldName);
            context.setCurrentObject(obj);
            getterClass = getFieldClass(context);
            context.setCurrentType(getterClass);
        } catch (Throwable t) {
            throw OgnlOps.castToRuntime(t);
        }
        return className + "." + fieldName;
    }

    public String toSetSourceString(OgnlContext context, Object target) {
        try {
            Object obj = OgnlRuntime.getStaticField(context, className, fieldName);
            context.setCurrentObject(obj);
            getterClass = getFieldClass(context);
            context.setCurrentType(getterClass);
        } catch (Throwable t) {
            throw OgnlOps.castToRuntime(t);
        }

        return className + "." + fieldName;
    }
}