AttributeLayout.java
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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
*
* https://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.apache.commons.compress.harmony.unpack200;
import org.apache.commons.compress.harmony.pack200.Codec;
import org.apache.commons.compress.harmony.pack200.Pack200Exception;
import org.apache.commons.compress.harmony.unpack200.bytecode.ClassFileEntry;
import org.apache.commons.lang3.StringUtils;
/**
* Defines a layout that describes how an attribute will be transmitted.
*/
public class AttributeLayout implements IMatcher {
/**
* {@value}
*/
public static final String ACC_ABSTRACT = "ACC_ABSTRACT"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ACC_ANNOTATION = "ACC_ANNOTATION"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ACC_ENUM = "ACC_ENUM"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ACC_FINAL = "ACC_FINAL"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ACC_INTERFACE = "ACC_INTERFACE"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ACC_NATIVE = "ACC_NATIVE"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ACC_PRIVATE = "ACC_PRIVATE"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ACC_PROTECTED = "ACC_PROTECTED"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ACC_PUBLIC = "ACC_PUBLIC"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ACC_STATIC = "ACC_STATIC"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ACC_STRICT = "ACC_STRICT"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ACC_SYNCHRONIZED = "ACC_SYNCHRONIZED"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ACC_SYNTHETIC = "ACC_SYNTHETIC"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ACC_TRANSIENT = "ACC_TRANSIENT"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ACC_VOLATILE = "ACC_VOLATILE"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ATTRIBUTE_ANNOTATION_DEFAULT = "AnnotationDefault"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ATTRIBUTE_CLASS_FILE_VERSION = "class-file version"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ATTRIBUTE_CODE = "Code"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ATTRIBUTE_CONSTANT_VALUE = "ConstantValue"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ATTRIBUTE_DEPRECATED = "Deprecated"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ATTRIBUTE_ENCLOSING_METHOD = "EnclosingMethod"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ATTRIBUTE_EXCEPTIONS = "Exceptions"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ATTRIBUTE_INNER_CLASSES = "InnerClasses"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ATTRIBUTE_LINE_NUMBER_TABLE = "LineNumberTable"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ATTRIBUTE_LOCAL_VARIABLE_TABLE = "LocalVariableTable"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ATTRIBUTE_LOCAL_VARIABLE_TYPE_TABLE = "LocalVariableTypeTable"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ATTRIBUTE_RUNTIME_INVISIBLE_ANNOTATIONS = "RuntimeInvisibleAnnotations"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ATTRIBUTE_RUNTIME_INVISIBLE_PARAMETER_ANNOTATIONS = "RuntimeInvisibleParameterAnnotations"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ATTRIBUTE_RUNTIME_VISIBLE_ANNOTATIONS = "RuntimeVisibleAnnotations"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ATTRIBUTE_RUNTIME_VISIBLE_PARAMETER_ANNOTATIONS = "RuntimeVisibleParameterAnnotations"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ATTRIBUTE_SIGNATURE = "Signature"; //$NON-NLS-1$
/**
* {@value}
*/
public static final String ATTRIBUTE_SOURCE_FILE = "SourceFile"; //$NON-NLS-1$
/**
* {@value}
*/
public static final int CONTEXT_CLASS = 0;
/**
* {@value}
*/
public static final int CONTEXT_CODE = 3;
/**
* {@value}
*/
public static final int CONTEXT_FIELD = 1;
/**
* {@value}
*/
public static final int CONTEXT_METHOD = 2;
/**
* Context names.
*/
public static final String[] contextNames = { "Class", "Field", "Method", //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
"Code", }; //$NON-NLS-1$
private static ClassFileEntry getValue(final String layout, long longIndex, final SegmentConstantPool pool) throws Pack200Exception {
if (layout.startsWith("R")) { //$NON-NLS-1$
// references
if (layout.indexOf('N') != -1) {
longIndex--;
}
if (layout.startsWith("RU")) { //$NON-NLS-1$
return pool.getValue(SegmentConstantPool.UTF_8, longIndex);
}
if (layout.startsWith("RS")) { //$NON-NLS-1$
return pool.getValue(SegmentConstantPool.SIGNATURE, longIndex);
}
} else if (layout.startsWith("K")) { //$NON-NLS-1$
final char type = layout.charAt(1);
switch (type) {
case 'S': // String
return pool.getValue(SegmentConstantPool.CP_STRING, longIndex);
case 'I': // Int (or byte or short)
case 'C': // Char
return pool.getValue(SegmentConstantPool.CP_INT, longIndex);
case 'F': // Float
return pool.getValue(SegmentConstantPool.CP_FLOAT, longIndex);
case 'J': // Long
return pool.getValue(SegmentConstantPool.CP_LONG, longIndex);
case 'D': // Double
return pool.getValue(SegmentConstantPool.CP_DOUBLE, longIndex);
}
}
throw new Pack200Exception("Unknown layout encoding: " + layout);
}
private final int context;
private final int index;
private final String layout;
private long mask;
private final String name;
private final boolean isDefault;
private int backwardsCallCount;
/**
* Constructs a default AttributeLayout (equivalent to {@code new AttributeLayout(name, context, layout, index, true);})
*
* @param name The layout name.
* @param context One of {@link #CONTEXT_CLASS}, {@link #CONTEXT_CODE}, {@link #CONTEXT_FIELD}, {@link #CONTEXT_METHOD}.
* @param layout The layout.
* @param index The index, currently used as part of computing the hash code.
* @throws Pack200Exception Attribute context out of range.
* @throws Pack200Exception Cannot have a null layout.
* @throws Pack200Exception Cannot have an unnamed layout.
*/
public AttributeLayout(final String name, final int context, final String layout, final int index) throws Pack200Exception {
this(name, context, layout, index, true);
}
/**
* Constructs a default AttributeLayout (equivalent to {@code new AttributeLayout(name, context, layout, index, true);})
*
* @param name The layout name.
* @param context One of {@link #CONTEXT_CLASS}, {@link #CONTEXT_CODE}, {@link #CONTEXT_FIELD}, {@link #CONTEXT_METHOD}.
* @param layout The layout.
* @param index The index, currently used as part of computing the hash code.
* @param isDefault Whether this is the default layout.
* @throws Pack200Exception Attribute context out of range.
* @throws Pack200Exception Cannot have a null layout.
* @throws Pack200Exception Cannot have an unnamed layout.
*/
public AttributeLayout(final String name, final int context, final String layout, final int index, final boolean isDefault) throws Pack200Exception {
this.index = index;
this.context = context;
if (index >= 0) {
this.mask = 1L << index;
} else {
this.mask = 0;
}
if (context != CONTEXT_CLASS && context != CONTEXT_CODE && context != CONTEXT_FIELD && context != CONTEXT_METHOD) {
throw new Pack200Exception("Attribute context out of range: " + context);
}
if (layout == null) {
throw new Pack200Exception("Cannot have a null layout");
}
if (StringUtils.isEmpty(name)) {
throw new Pack200Exception("Cannot have an unnamed layout");
}
this.name = name;
this.layout = layout;
this.isDefault = isDefault;
}
/**
* Gets the Codec based on the layout.
*
* @return the Codec.
*/
public Codec getCodec() {
if (layout.indexOf('O') >= 0) {
return Codec.BRANCH5;
}
if (layout.indexOf('P') >= 0) {
return Codec.BCI5;
}
if (layout.indexOf('S') >= 0 && !layout.contains("KS") //$NON-NLS-1$
&& !layout.contains("RS")) { //$NON-NLS-1$
return Codec.SIGNED5;
}
if (layout.indexOf('B') >= 0) {
return Codec.BYTE1;
}
return Codec.UNSIGNED5;
}
/**
* Gets the context.
*
* @return the context.
*/
public int getContext() {
return context;
}
/**
* Gets the index.
*
* @return the index.
*/
public int getIndex() {
return index;
}
/**
* Gets the layout.
*
* @return the layout.
*/
public String getLayout() {
return layout;
}
/**
* Gets the name.
*
* @return the name.
*/
public String getName() {
return name;
}
/**
* Gets the ClassFileEntry for the given input.
*
* @param longIndex An index into the segment constant pool.
* @param pool the segment constant pool.
* @return the matching ClassFileEntry.
* @throws Pack200Exception if the input is invalid.
*/
public ClassFileEntry getValue(final long longIndex, final SegmentConstantPool pool) throws Pack200Exception {
return getValue(layout, longIndex, pool);
}
/**
* Gets the ClassFileEntry for the given input.
*
* @param longIndex An index into the segment constant pool.
* @param type the Java type signature.
* @param pool the segment constant pool.
* @return the matching ClassFileEntry.
* @throws Pack200Exception if the input is invalid.
*/
public ClassFileEntry getValue(final long longIndex, final String type, final SegmentConstantPool pool) throws Pack200Exception {
// TODO This really needs to be better tested, esp. the different types
// TODO This should have the ability to deal with RUN stuff too, and
// unions
if (!layout.startsWith("KQ")) {
return getValue(layout, longIndex, pool);
}
if (type.equals("Ljava/lang/String;")) { //$NON-NLS-1$
return getValue("KS", longIndex, pool);
}
return getValue("K" + type + layout.substring(2), longIndex, //$NON-NLS-1$
pool);
}
@Override
public int hashCode() {
final int prime = 31;
int r = 1;
if (name != null) {
r = r * prime + name.hashCode();
}
if (layout != null) {
r = r * prime + layout.hashCode();
}
r = r * prime + index;
r = r * prime + context;
return r;
}
/**
* Tests whether this is the default layout.
*
* @return whether this is the default layout.
*/
public boolean isDefaultLayout() {
return isDefault;
}
/*
* (non-Javadoc)
*
* @see org.apache.commons.compress.harmony.unpack200.IMatches#matches(long)
*/
@Override
public boolean matches(final long value) {
return (value & mask) != 0;
}
/**
* Gets the backward call count.
*
* @return the backward call count.
*/
public int numBackwardsCallables() {
if ("*".equals(layout)) {
return 1;
}
return backwardsCallCount;
}
/**
* Sets the backward call count.
*
* @param backwardsCallCount the backward call count.
*/
public void setBackwardsCallCount(final int backwardsCallCount) {
this.backwardsCallCount = backwardsCallCount;
}
@Override
public String toString() {
return contextNames[context] + ": " + name;
}
}