org.mvel2.ast.ImportNode Maven / Gradle / Ivy

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/**
 * MVEL 2.0
 * Copyright (C) 2007 The Codehaus
 * Mike Brock, Dhanji Prasanna, John Graham, Mark Proctor
 *
 * 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.ast;

import static org.mvel2.util.ParseTools.findClassImportResolverFactory;

import org.mvel2.CompileException;
import org.mvel2.MVEL;
import org.mvel2.ParserContext;
import org.mvel2.integration.VariableResolverFactory;
import org.mvel2.integration.impl.ImmutableDefaultFactory;
import org.mvel2.integration.impl.StackResetResolverFactory;
import org.mvel2.util.ParseTools;

/**
 * @author Christopher Brock
 */
public class ImportNode extends ASTNode {

    private static final char[] WC_TEST = new char[] { '.', '*' };
    private Class importClass;
    private boolean packageImport;
    private int _offset;

    public ImportNode(char[] expr, int start, int offset, ParserContext pCtx) {
        super(pCtx);
        this.expr = expr;
        this.start = start;
        this.offset = offset;
        this.pCtx = pCtx;

        if (ParseTools.endsWith(expr, start, offset, WC_TEST)) {
            packageImport = true;
            _offset = (short) ParseTools.findLast(expr, start, offset, '.');
            if (_offset == -1) {
                _offset = 0;
            }
        } else {
            String clsName = new String(expr, start, offset);

            ClassLoader classLoader = getClassLoader();

            try {
                this.importClass = Class.forName(clsName, true, classLoader);
            } catch (ClassNotFoundException e) {
                int idx;
                clsName = (clsName.substring(0, idx = clsName.lastIndexOf('.')) + "$" + clsName.substring(idx + 1)).trim();

                try {
                    this.importClass = Class.forName(clsName, true, classLoader);
                } catch (ClassNotFoundException e2) {
                    throw new CompileException("class not found: " + new String(expr), expr, start);
                }
            }
        }
    }

    public Object getReducedValueAccelerated(Object ctx, Object thisValue, VariableResolverFactory factory) {
        if (!packageImport) {
            if (MVEL.COMPILER_OPT_ALLOCATE_TYPE_LITERALS_TO_SHARED_SYMBOL_TABLE) {
                factory.createVariable(importClass.getSimpleName(), importClass);
                return importClass;
            }
            return findClassImportResolverFactory(factory, pCtx).addClass(importClass);
        }

        // if the factory is an ImmutableDefaultFactory it means this import is unused so we can skip it safely
        if (!(factory instanceof ImmutableDefaultFactory) && !(factory instanceof StackResetResolverFactory
                && ((StackResetResolverFactory) factory).getDelegate() instanceof ImmutableDefaultFactory)) {
            findClassImportResolverFactory(factory, pCtx).addPackageImport(new String(expr, start, _offset - start));
        }
        return null;
    }

    public Object getReducedValue(Object ctx, Object thisValue, VariableResolverFactory factory) {
        return getReducedValueAccelerated(ctx, thisValue, factory);
    }

    public Class getImportClass() {
        return importClass;
    }

    public boolean isPackageImport() {
        return packageImport;
    }

    public String getPackageImport() {
        return new String(expr, start, _offset - start);
    }

    public void setPackageImport(boolean packageImport) {
        this.packageImport = packageImport;
    }
}