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// Copyright 2016 The Bazel Authors. All rights reserved.
//
// 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.google.devtools.build.android.resources;
import com.google.common.base.MoreObjects;
import com.google.common.base.Preconditions;
import com.google.common.base.Splitter;
import com.google.common.collect.ImmutableCollection;
import com.google.common.collect.ImmutableList;
import java.io.IOException;
import java.io.Writer;
import java.util.Objects;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.Type;
import org.objectweb.asm.commons.InstructionAdapter;
/** Models an int[] field initializer. */
public final class IntArrayFieldInitializer implements FieldInitializer {
public static final String DESC = "[I";
private final ImmutableCollection<Integer> values;
private IntArrayFieldInitializer(ImmutableCollection<Integer> values) {
this.values = values;
}
public static FieldInitializer of(String value) {
Preconditions.checkArgument(value.startsWith("{ "), "Expected list starting with { ");
Preconditions.checkArgument(value.endsWith(" }"), "Expected list ending with } ");
// Check for an empty list, which is "{ }".
if (value.length() < 4) {
return of(ImmutableList.<Integer>of());
}
ImmutableList.Builder<Integer> intValues = ImmutableList.builder();
String trimmedValue = value.substring(2, value.length() - 2);
Iterable<String> valueStrings = Splitter.on(',').trimResults().split(trimmedValue);
for (String valueString : valueStrings) {
intValues.add(Integer.decode(valueString));
}
return of(intValues.build());
}
public static IntArrayFieldInitializer of(ImmutableCollection<Integer> values) {
return new IntArrayFieldInitializer(values);
}
@Override
public boolean writeFieldDefinition(
String fieldName, ClassWriter cw, int accessLevel, boolean isFinal) {
cw.visitField(accessLevel, fieldName, DESC, null, null).visitEnd();
return true;
}
@Override
public int writeCLInit(String fieldName, InstructionAdapter insts, String className) {
insts.iconst(values.size());
insts.newarray(Type.INT_TYPE);
int curIndex = 0;
for (Integer value : values) {
insts.dup();
insts.iconst(curIndex);
insts.iconst(value);
insts.astore(Type.INT_TYPE);
++curIndex;
}
insts.putstatic(className, fieldName, DESC);
// Needs up to 4 stack slots for: the array ref for the putstatic, the dup of the array ref
// for the store, the index, and the value to store.
return 4;
}
@Override
public void writeInitSource(String fieldName, Writer writer, boolean finalFields)
throws IOException {
StringBuilder builder = new StringBuilder();
boolean first = true;
for (Integer attrId : values) {
if (first) {
first = false;
builder.append(String.format("0x%x", attrId));
} else {
builder.append(String.format(", 0x%x", attrId));
}
}
writer.write(
String.format(
" public static %sint[] %s = { %s };\n",
finalFields ? "final " : "", fieldName, builder.toString()));
}
@Override
public String toString() {
return MoreObjects.toStringHelper(getClass()).add("values", values).toString();
}
@Override
public int hashCode() {
return values.hashCode();
}
@Override
public boolean equals(Object obj) {
if (obj instanceof IntArrayFieldInitializer) {
IntArrayFieldInitializer other = (IntArrayFieldInitializer) obj;
return Objects.equals(values, other.values);
}
return false;
}
}
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