com.google.gdt.eclipse.designer.hosted.classloader.GWTDesignTimeVisitor.java Source code

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Here is the source code for com.google.gdt.eclipse.designer.hosted.classloader.GWTDesignTimeVisitor.java

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/*******************************************************************************
 * Copyright 2011 Google Inc. All Rights Reserved.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * 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 com.google.gdt.eclipse.designer.hosted.classloader;

import org.eclipse.wb.internal.core.utils.asm.ToBytesClassAdapter;

import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.MethodAdapter;
import org.objectweb.asm.MethodVisitor;

/**
 * Rewrites <code>"static boolean isDesignTime()"</code> to return <code>true</code>.
 * 
 * @author scheglov_ke
 * @coverage gwtHosted
 */
public final class GWTDesignTimeVisitor extends ToBytesClassAdapter {
    ////////////////////////////////////////////////////////////////////////////
    //
    // Constructor
    //
    ////////////////////////////////////////////////////////////////////////////
    public GWTDesignTimeVisitor() {
        super(ClassWriter.COMPUTE_MAXS);
    }

    ////////////////////////////////////////////////////////////////////////////
    //
    // Visiting
    //
    ////////////////////////////////////////////////////////////////////////////
    @Override
    public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
        // force "static boolean isDesignTime()" return "true"
        if ("isDesignTime".equals(name) && "()Z".equals(desc) && (access & ACC_STATIC) == ACC_STATIC) {
            MethodVisitor mv = super.visitMethod(access, name, desc, signature, exceptions);
            return new MethodAdapter(mv) {
                @Override
                public void visitCode() {
                    super.visitCode();
                    mv.visitIntInsn(SIPUSH, 1);
                    mv.visitInsn(IRETURN);
                }
            };
        }
        // any other method
        return super.visitMethod(access, name, desc, signature, exceptions);
    }
}