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src/java.xml/share/classes/com/sun/org/apache/bcel/internal/classfile/LocalVariableTable.java
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@@ -19,145 +19,183 @@
* limitations under the License.
*/
package com.sun.org.apache.bcel.internal.classfile;
+import java.io.DataInput;
+import java.io.DataOutputStream;
+import java.io.IOException;
-import com.sun.org.apache.bcel.internal.Constants;
-import java.io.*;
+import com.sun.org.apache.bcel.internal.Const;
/**
* This class represents colection of local variables in a
* method. This attribute is contained in the <em>Code</em> attribute.
*
- * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
+ * @version $Id: LocalVariableTable.java 1749603 2016-06-21 20:50:19Z ggregory $
* @see Code
* @see LocalVariable
*/
public class LocalVariableTable extends Attribute {
- private int local_variable_table_length; // Table of local
+
private LocalVariable[] local_variable_table; // variables
+
/**
* Initialize from another object. Note that both objects use the same
* references (shallow copy). Use copy() for a physical copy.
*/
- public LocalVariableTable(LocalVariableTable c) {
- this(c.getNameIndex(), c.getLength(), c.getLocalVariableTable(),
- c.getConstantPool());
+ public LocalVariableTable(final LocalVariableTable c) {
+ this(c.getNameIndex(), c.getLength(), c.getLocalVariableTable(), c.getConstantPool());
}
+
/**
* @param name_index Index in constant pool to `LocalVariableTable'
* @param length Content length in bytes
* @param local_variable_table Table of local variables
* @param constant_pool Array of constants
*/
- public LocalVariableTable(int name_index, int length,
- LocalVariable[] local_variable_table,
- ConstantPool constant_pool)
- {
- super(Constants.ATTR_LOCAL_VARIABLE_TABLE, name_index, length, constant_pool);
- setLocalVariableTable(local_variable_table);
+ public LocalVariableTable(final int name_index, final int length, final LocalVariable[] local_variable_table,
+ final ConstantPool constant_pool) {
+ super(Const.ATTR_LOCAL_VARIABLE_TABLE, name_index, length, constant_pool);
+ this.local_variable_table = local_variable_table;
}
+
/**
- * Construct object from file stream.
+ * Construct object from input stream.
* @param name_index Index in constant pool
* @param length Content length in bytes
- * @param file Input stream
+ * @param input Input stream
* @param constant_pool Array of constants
* @throws IOException
*/
- LocalVariableTable(int name_index, int length, DataInputStream file,
- ConstantPool constant_pool) throws IOException
- {
- this(name_index, length, (LocalVariable[])null, constant_pool);
-
- local_variable_table_length = (file.readUnsignedShort());
+ LocalVariableTable(final int name_index, final int length, final DataInput input, final ConstantPool constant_pool)
+ throws IOException {
+ this(name_index, length, (LocalVariable[]) null, constant_pool);
+ final int local_variable_table_length = input.readUnsignedShort();
local_variable_table = new LocalVariable[local_variable_table_length];
-
- for(int i=0; i < local_variable_table_length; i++)
- local_variable_table[i] = new LocalVariable(file, constant_pool);
+ for (int i = 0; i < local_variable_table_length; i++) {
+ local_variable_table[i] = new LocalVariable(input, constant_pool);
+ }
}
+
/**
* Called by objects that are traversing the nodes of the tree implicitely
* defined by the contents of a Java class. I.e., the hierarchy of methods,
* fields, attributes, etc. spawns a tree of objects.
*
* @param v Visitor object
*/
- public void accept(Visitor v) {
+ @Override
+ public void accept( final Visitor v ) {
v.visitLocalVariableTable(this);
}
+
/**
* Dump local variable table attribute to file stream in binary format.
*
* @param file Output file stream
* @throws IOException
*/
- public final void dump(DataOutputStream file) throws IOException
- {
+ @Override
+ public final void dump( final DataOutputStream file ) throws IOException {
super.dump(file);
- file.writeShort(local_variable_table_length);
- for(int i=0; i < local_variable_table_length; i++)
- local_variable_table[i].dump(file);
+ file.writeShort(local_variable_table.length);
+ for (final LocalVariable variable : local_variable_table) {
+ variable.dump(file);
+ }
}
+
/**
* @return Array of local variables of method.
*/
public final LocalVariable[] getLocalVariableTable() {
return local_variable_table;
}
- /** @return first matching variable using index
+
+ /**
+ *
+ * @param index the variable slot
+ *
+ * @return the first LocalVariable that matches the slot or null if not found
+ *
+ * @deprecated since 5.2 because multiple variables can share the
+ * same slot, use getLocalVariable(int index, int pc) instead.
*/
- public final LocalVariable getLocalVariable(int index) {
- for(int i=0; i < local_variable_table_length; i++)
- if(local_variable_table[i].getIndex() == index)
- return local_variable_table[i];
+ @java.lang.Deprecated
+ public final LocalVariable getLocalVariable( final int index ) {
+ for (final LocalVariable variable : local_variable_table) {
+ if (variable.getIndex() == index) {
+ return variable;
+ }
+ }
+ return null;
+ }
+
+ /**
+ *
+ * @param index the variable slot
+ * @param pc the current pc that this variable is alive
+ *
+ * @return the LocalVariable that matches or null if not found
+ */
+ public final LocalVariable getLocalVariable( final int index, final int pc ) {
+ for (final LocalVariable variable : local_variable_table) {
+ if (variable.getIndex() == index) {
+ final int start_pc = variable.getStartPC();
+ final int end_pc = start_pc + variable.getLength();
+ if ((pc >= start_pc) && (pc <= end_pc)) {
+ return variable;
+ }
+ }
+ }
return null;
}
- public final void setLocalVariableTable(LocalVariable[] local_variable_table)
- {
+
+ public final void setLocalVariableTable( final LocalVariable[] local_variable_table ) {
this.local_variable_table = local_variable_table;
- local_variable_table_length = (local_variable_table == null)? 0 :
- local_variable_table.length;
}
+
/**
* @return String representation.
*/
+ @Override
public final String toString() {
- StringBuffer buf = new StringBuffer("");
-
- for(int i=0; i < local_variable_table_length; i++) {
- buf.append(local_variable_table[i].toString());
-
- if(i < local_variable_table_length - 1)
+ final StringBuilder buf = new StringBuilder();
+ for (int i = 0; i < local_variable_table.length; i++) {
+ buf.append(local_variable_table[i]);
+ if (i < local_variable_table.length - 1) {
buf.append('\n');
}
-
+ }
return buf.toString();
}
+
/**
* @return deep copy of this attribute
*/
- public Attribute copy(ConstantPool constant_pool) {
- LocalVariableTable c = (LocalVariableTable)clone();
-
- c.local_variable_table = new LocalVariable[local_variable_table_length];
- for(int i=0; i < local_variable_table_length; i++)
+ @Override
+ public Attribute copy( final ConstantPool _constant_pool ) {
+ final LocalVariableTable c = (LocalVariableTable) clone();
+ c.local_variable_table = new LocalVariable[local_variable_table.length];
+ for (int i = 0; i < local_variable_table.length; i++) {
c.local_variable_table[i] = local_variable_table[i].copy();
-
- c.constant_pool = constant_pool;
+ }
+ c.setConstantPool(_constant_pool);
return c;
}
- public final int getTableLength() { return local_variable_table_length; }
+
+ public final int getTableLength() {
+ return local_variable_table == null ? 0 : local_variable_table.length;
+ }
}
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