src/main/java/io/devnulllabs/openjava/ptree/ExpressionObject.java


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/*
 * ExpressionObject.java 1.0
 *
 *
 * June 23, 2000
 *
 * @see io.devnulllabs.openjava.ptree.ParseTree
 * @version 1.0 last updated:  June 23, 2000
 * @author  Michiaki Tatsubori
 */
package io.devnulllabs.openjava.ptree;


import io.devnulllabs.openjava.mop.Environment;
import io.devnulllabs.openjava.mop.OJClass;


/**
 * The Expression interface presents common interface
 * to access Expression node of parse tree
 *
 * this interface is implements by
 * <pre>
 *   UnaryExpression
 *   BinaryExpression
 *   ConditionalExpression
 *   AssignmentExpression
 *   CastExpression
 *   AllocationExpression
 *   ArrayAllocationExpression
 *   Variable
 *   MethodCall
 *   SpecialName
 *   Literal
 *   ClassLiteral
 *   ArrayAccess
 *   FieldAccess
 * </pre>
 *
 * @see io.devnulllabs.openjava.ptree.ParseTree
 * @see io.devnulllabs.openjava.ptree.NonLeaf
 */
public abstract class ExpressionObject extends NonLeaf
    implements Expression
{
    private OJClass cachedType = null;

    void soilCache() {
    cachedType = null;
    ParseTree parent = getParent();
    if (parent instanceof ExpressionObject) {
        ExpressionObject pexp = (ExpressionObject) parent;
        pexp.soilCache();
    }
    }

    /**
     * dirty implementation
     */
    public OJClass getCachedType(Environment env) throws Exception {
    if (cachedType == null)  cachedType = getType(env);
    return cachedType;
    }

    public abstract OJClass getType(Environment env, boolean using_cache)
    throws Exception;

    public abstract OJClass getType(Environment env)
    throws Exception;

    /**
     * Makes this ptree a list presenting for
     * [ p ]
     *
     * @param  p  list's element
     */
    protected void set( Object[] ptrees )  {
    soilCache();
    super.set(ptrees);
    }

}