ch.sourcepond.utils.podescoin.internal.method.ReadObjectEnhancer.java Source code

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Here is the source code for ch.sourcepond.utils.podescoin.internal.method.ReadObjectEnhancer.java

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/*Copyright (C) 2016 Roland Hauser, <sourcepond@gmail.com>
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 ch.sourcepond.utils.podescoin.internal.method;

import static ch.sourcepond.utils.podescoin.internal.Constants.CONSTRUCTOR_NAME;
import static ch.sourcepond.utils.podescoin.internal.inspector.DefaultStreamCallGenerator.OBJECT_INPUT_STREAM_INTERNAL_NAME;
import static org.objectweb.asm.Opcodes.ALOAD;
import static org.objectweb.asm.Opcodes.ASTORE;
import static org.objectweb.asm.Opcodes.ATHROW;
import static org.objectweb.asm.Opcodes.DUP;
import static org.objectweb.asm.Opcodes.GOTO;
import static org.objectweb.asm.Opcodes.INVOKESPECIAL;
import static org.objectweb.asm.Opcodes.INVOKEVIRTUAL;
import static org.objectweb.asm.Opcodes.NEW;
import static org.objectweb.asm.Type.getInternalName;

import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;

import ch.sourcepond.utils.podescoin.internal.inspector.DefaultStreamCallGenerator;
import ch.sourcepond.utils.podescoin.internal.inspector.Inspector;

final class ReadObjectEnhancer extends InjectorMethodEnhancer {
    private static final String CLASS_NOT_FOUND_EXCEPTION_INTERNAL_NAME = getInternalName(
            ClassNotFoundException.class);
    private final Label l2 = new Label();
    private final Label l3 = new Label();
    private final Label l4 = new Label();
    private final Label l5 = new Label();

    ReadObjectEnhancer(final Inspector pInspector, final MethodVisitor pDelegate, final boolean pEnhanceMode,
            final DefaultStreamCallGenerator pDefaultStreamCallGenerator) {
        super(pInspector, pDelegate, pEnhanceMode, pDefaultStreamCallGenerator);
    }

    protected void tryBlock() {
        visitTryCatchBlock(l0, l1, l2, CLASS_NOT_FOUND_EXCEPTION_INTERNAL_NAME);
        visitTryCatchBlock(l0, l1, l3, IO_EXCEPTION_INTERNAL_NAME);
        visitTryCatchBlock(l0, l1, l4, EXCEPTION_INTERNAL_NAME);
    }

    protected void catchBlock() {
        visitJumpInsn(GOTO, l5);
        visitLabel(l2);
        visitFrame(
                Opcodes.F_FULL, 3, new Object[] { inspector.getInternalClassName(),
                        OBJECT_INPUT_STREAM_INTERNAL_NAME, CONTAINER_INTERNAL_NAME },
                1, new Object[] { EXCEPTION_INTERNAL_NAME });

        visitVarInsn(ASTORE, 3);
        visitVarInsn(ALOAD, 3);
        visitInsn(ATHROW);
        visitLabel(l3);
        visitFrame(Opcodes.F_SAME1, 0, null, 1, new Object[] { IO_EXCEPTION_INTERNAL_NAME });
        visitVarInsn(ASTORE, 3);
        visitVarInsn(ALOAD, 3);
        visitInsn(ATHROW);
        visitLabel(l4);
        visitFrame(Opcodes.F_SAME1, 0, null, 1, new Object[] { EXCEPTION_INTERNAL_NAME });
        visitVarInsn(ASTORE, 3);
        visitTypeInsn(NEW, IO_EXCEPTION_INTERNAL_NAME);
        visitInsn(DUP);
        visitVarInsn(ALOAD, 3);
        visitMethodInsn(INVOKEVIRTUAL, EXCEPTION_INTERNAL_NAME, GET_MESSAGE_NAME, GET_MESSAGE_DESC, false);
        visitVarInsn(ALOAD, 3);
        visitMethodInsn(INVOKESPECIAL, IO_EXCEPTION_INTERNAL_NAME, CONSTRUCTOR_NAME, CONSTRUCTOR_DESC, false);
        visitInsn(ATHROW);
        visitLabel(l5);
    }
}