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/*
* Copyright (C) 2011 The Android Open Source Project
*
* 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 com.android.dx.io;
import com.android.dx.io.instructions.DecodedInstruction;
import com.android.dx.util.DexException;
/**
* Walks through a block of code and calls visitor call backs.
*/
public final class CodeReader {
private Visitor fallbackVisitor = null;
private Visitor stringVisitor = null;
private Visitor typeVisitor = null;
private Visitor fieldVisitor = null;
private Visitor methodVisitor = null;
/**
* Sets {@code visitor} as the visitor for all instructions.
*/
public void setAllVisitors(Visitor visitor) {
fallbackVisitor = visitor;
stringVisitor = visitor;
typeVisitor = visitor;
fieldVisitor = visitor;
methodVisitor = visitor;
}
/**
* Sets {@code visitor} as the visitor for all instructions not
* otherwise handled.
*/
public void setFallbackVisitor(Visitor visitor) {
fallbackVisitor = visitor;
}
/**
* Sets {@code visitor} as the visitor for all string instructions.
*/
public void setStringVisitor(Visitor visitor) {
stringVisitor = visitor;
}
/**
* Sets {@code visitor} as the visitor for all type instructions.
*/
public void setTypeVisitor(Visitor visitor) {
typeVisitor = visitor;
}
/**
* Sets {@code visitor} as the visitor for all field instructions.
*/
public void setFieldVisitor(Visitor visitor) {
fieldVisitor = visitor;
}
/**
* Sets {@code visitor} as the visitor for all method instructions.
*/
public void setMethodVisitor(Visitor visitor) {
methodVisitor = visitor;
}
public void visitAll(DecodedInstruction[] decodedInstructions)
throws DexException {
int size = decodedInstructions.length;
for (int i = 0; i < size; i++) {
DecodedInstruction one = decodedInstructions[i];
if (one == null) {
continue;
}
callVisit(decodedInstructions, one);
}
}
public void visitAll(short[] encodedInstructions) throws DexException {
DecodedInstruction[] decodedInstructions =
DecodedInstruction.decodeAll(encodedInstructions);
visitAll(decodedInstructions);
}
private void callVisit(DecodedInstruction[] all, DecodedInstruction one) {
Visitor visitor = null;
switch (OpcodeInfo.getIndexType(one.getOpcode())) {
case STRING_REF: visitor = stringVisitor; break;
case TYPE_REF: visitor = typeVisitor; break;
case FIELD_REF: visitor = fieldVisitor; break;
case METHOD_REF: visitor = methodVisitor; break;
}
if (visitor == null) {
visitor = fallbackVisitor;
}
if (visitor != null) {
visitor.visit(all, one);
}
}
public interface Visitor {
void visit(DecodedInstruction[] all, DecodedInstruction one);
}
}
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