1 files changed, 118 insertions, 0 deletions
diff --git a/dexgen/src/com/android/dexgen/dex/code/OutputCollector.java b/dexgen/src/com/android/dexgen/dex/code/OutputCollector.java
new file mode 100644
index 0000000..7f970eb
--- /dev/null
+++ b/dexgen/src/com/android/dexgen/dex/code/OutputCollector.java
@@ -0,0 +1,118 @@
+/*
+ * Copyright (C) 2007 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.dexgen.dex.code;
+
+import java.util.ArrayList;
+
+/**
+ * Destination for {@link DalvInsn} instances being output. This class
+ * receives and collects instructions in two pieces &mdash; a primary
+ * list and a suffix (generally consisting of adjunct data referred to
+ * by the primary list, such as switch case tables) &mdash; which it
+ * merges and emits back out in the form of a {@link DalvInsnList}
+ * instance.
+ */
+public final class OutputCollector {
+    /**
+     * {@code non-null;} the associated finisher (which holds the instruction
+     * list in-progress)
+     */
+    private final OutputFinisher finisher;
+
+    /**
+     * {@code null-ok;} suffix for the output, or {@code null} if the suffix
+     * has been appended to the main output (by {@link #appendSuffixToOutput})
+     */
+    private ArrayList<DalvInsn> suffix;
+
+    /**
+     * Constructs an instance.
+     *
+     * @param initialCapacity {@code >= 0;} initial capacity of the output list
+     * @param suffixInitialCapacity {@code >= 0;} initial capacity of the output
+     * suffix
+     * @param regCount {@code >= 0;} register count for the method
+     */
+    public OutputCollector(int initialCapacity, int suffixInitialCapacity,
+            int regCount) {
+        this.finisher = new OutputFinisher(initialCapacity, regCount);
+        this.suffix = new ArrayList<DalvInsn>(suffixInitialCapacity);
+    }
+
+    /**
+     * Adds an instruction to the output.
+     *
+     * @param insn {@code non-null;} the instruction to add
+     */
+    public void add(DalvInsn insn) {
+        finisher.add(insn);
+    }
+
+    /**
+     * Reverses a branch which is buried a given number of instructions
+     * backward in the output. It is illegal to call this unless the
+     * indicated instruction really is a reversible branch.
+     *
+     * @param which how many instructions back to find the branch;
+     * {@code 0} is the most recently added instruction,
+     * {@code 1} is the instruction before that, etc.
+     * @param newTarget {@code non-null;} the new target for the reversed branch
+     */
+    public void reverseBranch(int which, CodeAddress newTarget) {
+        finisher.reverseBranch(which, newTarget);
+    }
+
+    /**
+     * Adds an instruction to the output suffix.
+     *
+     * @param insn {@code non-null;} the instruction to add
+     */
+    public void addSuffix(DalvInsn insn) {
+        suffix.add(insn);
+    }
+
+    /**
+     * Gets the results of all the calls on this instance, in the form of
+     * an {@link OutputFinisher}.
+     *
+     * @return {@code non-null;} the output finisher
+     * @throws UnsupportedOperationException if this method has
+     * already been called
+     */
+    public OutputFinisher getFinisher() {
+        if (suffix == null) {
+            throw new UnsupportedOperationException("already processed");
+        }
+
+        appendSuffixToOutput();
+        return finisher;
+    }
+
+    /**
+     * Helper for {@link #getFinisher}, which appends the suffix to
+     * the primary output.
+     */
+    private void appendSuffixToOutput() {
+        int size = suffix.size();
+
+        for (int i = 0; i < size; i++) {
+            finisher.add(suffix.get(i));
+        }
+
+        suffix = null;
+    }
+}