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/*
* [The "BSD licence"]
* Copyright (c) 2010 Ben Gruver (JesusFreke)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.jf.dexlib;
import org.jf.dexlib.Util.AnnotatedOutput;
import org.jf.dexlib.Util.Input;
import org.jf.dexlib.Util.Leb128Utils;
import org.jf.dexlib.Util.Utf8Utils;
public class StringDataItem extends Item<StringDataItem> {
private int hashCode = 0;
private String stringValue;
/**
* Creates a new uninitialized <code>StringDataItem</code>
* @param dexFile The <code>DexFile</code> that this item belongs to
*/
protected StringDataItem(DexFile dexFile) {
super(dexFile);
}
/**
* Creates a new <code>StringDataItem</code> for the given string
* @param dexFile The <code>DexFile</code> that this item belongs to
* @param stringValue The string value that this item represents
*/
private StringDataItem(DexFile dexFile, String stringValue) {
super(dexFile);
this.stringValue = stringValue;
}
/**
* Returns a <code>StringDataItem</code> for the given values, and that has been interned into
* the given <code>DexFile</code>
* @param dexFile The <code>DexFile</code> that this item belongs to
* @param value The string value that this item represents
* @return a <code>StringDataItem</code> for the given values, and that has been interned into
* the given <code>DexFile</code>
*/
public static StringDataItem internStringDataItem(DexFile dexFile, String value) {
StringDataItem StringDataItem = new StringDataItem(dexFile, value);
return dexFile.StringDataSection.intern(StringDataItem);
}
/**
* Looks up the <code>StringDataItem</code> from the given <code>DexFile</code> for the given
* string value
* @param dexFile the <code>Dexfile</code> to find the string value in
* @param value The string value to look up
* @return a <code>StringDataItem</code> from the given <code>DexFile</code> for the given
* string value, or null if it doesn't exist
**/
public static StringDataItem lookupStringDataItem(DexFile dexFile, String value) {
StringDataItem StringDataItem = new StringDataItem(dexFile, value);
return dexFile.StringDataSection.getInternedItem(StringDataItem);
}
/** {@inheritDoc} */
protected void readItem(Input in, ReadContext readContext) {
in.readUnsignedLeb128(); //string length
stringValue = in.realNullTerminatedUtf8String();
}
/** {@inheritDoc} */
protected int placeItem(int offset) {
return offset + Leb128Utils.unsignedLeb128Size(stringValue.length()) +
Utf8Utils.stringToUtf8Bytes(stringValue).length + 1;
}
/** {@inheritDoc} */
protected void writeItem(AnnotatedOutput out) {
byte[] encodedValue = Utf8Utils.stringToUtf8Bytes(stringValue);
if (out.annotates()) {
out.annotate("string_size: 0x" + Integer.toHexString(stringValue.length()) + " (" + stringValue.length() +
")");
out.writeUnsignedLeb128(stringValue.length());
out.annotate(encodedValue.length + 1, "string_data: \"" + Utf8Utils.escapeString(stringValue) + "\"");
} else {
out.writeUnsignedLeb128(stringValue.length());
}
out.write(encodedValue);
out.writeByte(0);
}
/** {@inheritDoc} */
public ItemType getItemType() {
return ItemType.TYPE_STRING_DATA_ITEM;
}
/** {@inheritDoc} */
public String getConciseIdentity() {
return "string_data_item: \"" + Utf8Utils.escapeString(getStringValue()) + "\"";
}
/** {@inheritDoc} */
public int compareTo(StringDataItem o) {
return getStringValue().compareTo(o.getStringValue());
}
/**
* Get the string value of this item as a <code>String</code>
* @return the string value of this item as a String
*/
public String getStringValue() {
return stringValue;
}
/**
* calculate and cache the hashcode
*/
private void calcHashCode() {
hashCode = getStringValue().hashCode();
}
@Override
public int hashCode() {
//there's a small possibility that the actual hash code will be 0. If so, we'll
//just end up recalculating it each time
if (hashCode == 0)
calcHashCode();
return hashCode;
}
@Override
public boolean equals(Object o) {
if (this==o) {
return true;
}
if (o==null || !this.getClass().equals(o.getClass())) {
return false;
}
//This assumes that the referenced items have been interned in both objects.
//This is a valid assumption because all outside code must use the static
//"getInterned..." style methods to make new items, and any item created
//internally is guaranteed to be interned
StringDataItem other = (StringDataItem)o;
return getStringValue().equals(other.getStringValue());
}
}
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