Drop dependency on Guava

pom.xml

@@ -17,11 +17,6 @@
       <artifactId>sslr-core</artifactId>
       <version>1.22</version>
     </dependency>
-    <dependency>
-      <groupId>com.google.guava</groupId>
-      <artifactId>guava</artifactId>
-      <version>10.0.1</version>
-    </dependency>
 
     <dependency>
       <groupId>org.easytesting</groupId>

src/main/java/org/sonar/example/llvm/ir/AllocaInstructionSyntax.java

@@ -1,7 +1,6 @@
 package org.sonar.example.llvm.ir;
 
-import com.google.common.collect.ImmutableList;
-
+import java.util.Arrays;
 import java.util.List;
 
 public class AllocaInstructionSyntax extends InstructionSyntax {
@@ -14,7 +13,7 @@ public AllocaInstructionSyntax(
     IdentifierSyntax result, SyntaxToken equalToken, SyntaxToken allocaToken, TypeSyntax type,
     SyntaxToken commaToken, SyntaxToken alignToken, SyntaxToken alignment) {
 
-    this.children = ImmutableList.of(
+    this.children = Arrays.asList(
       result, equalToken, allocaToken, type,
       commaToken, alignToken, alignment);
 

src/main/java/org/sonar/example/llvm/ir/BuiltinTypeSyntax.java

@@ -1,25 +1,26 @@
 package org.sonar.example.llvm.ir;
 
-import com.google.common.base.Preconditions;
-import com.google.common.collect.ImmutableList;
-import com.google.common.collect.ImmutableSet;
-
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
 
 public class BuiltinTypeSyntax extends TypeSyntax {
 
-  private static final Set<String> SUPPORTED_TYPES = ImmutableSet.of("i32", "i64");
+  private static final Set<String> SUPPORTED_TYPES = new HashSet<>(Arrays.asList("i32", "i64"));
   private final SyntaxToken token;
 
   public BuiltinTypeSyntax(SyntaxToken token) {
     this.token = token;
-    Preconditions.checkArgument(SUPPORTED_TYPES.contains(token.toString()), "Unsupported built-in type: " + token.toString());
+    if (!SUPPORTED_TYPES.contains(token.toString())) {
+      throw new IllegalArgumentException("Unsupported built-in type: " + token.toString());
+    }
   }
 
   @Override
   public List<SyntaxNode> children() {
-    return ImmutableList.<SyntaxNode>of(token);
+    return Collections.singletonList(token);
   }
 
 }

src/main/java/org/sonar/example/llvm/ir/CustomTypeSyntax.java

@@ -1,7 +1,6 @@
 package org.sonar.example.llvm.ir;
 
-import com.google.common.collect.ImmutableList;
-
+import java.util.Collections;
 import java.util.List;
 
 public class CustomTypeSyntax extends TypeSyntax {
@@ -14,7 +13,7 @@ public CustomTypeSyntax(SyntaxToken token) {
 
   @Override
   public List<SyntaxNode> children() {
-    return ImmutableList.<SyntaxNode>of(token);
+    return Collections.singletonList(token);
   }
 
 }

src/main/java/org/sonar/example/llvm/ir/FunctionDefinitionSyntax.java

@@ -1,7 +1,8 @@
 package org.sonar.example.llvm.ir;
 
-import com.google.common.collect.ImmutableList;
-
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 
 public class FunctionDefinitionSyntax extends SyntaxNode {
@@ -17,16 +18,15 @@ public FunctionDefinitionSyntax(
     SyntaxToken unnamedAddressToken,
     SyntaxToken openBraceToken, List<InstructionSyntax> instructions, SyntaxToken closeBraceToken) {
 
-    ImmutableList.Builder<SyntaxNode> childrenBuilder = ImmutableList.builder();
-
-    childrenBuilder.add(
+    ArrayList<SyntaxNode> children = new ArrayList<>();
+    children.addAll(Arrays.asList(
       defineToken, voidToken, identifier,
       openParenToken, paramType, param, closeParenToken,
-      unnamedAddressToken);
-    childrenBuilder.add(openBraceToken);
-    childrenBuilder.addAll(instructions);
-    childrenBuilder.add(closeBraceToken);
-    this.children = childrenBuilder.build();
+      unnamedAddressToken));
+    children.add(openBraceToken);
+    children.addAll(instructions);
+    children.add(closeBraceToken);
+    this.children = Collections.unmodifiableList(children);
 
     this.identifier = identifier;
     this.param = param;

src/main/java/org/sonar/example/llvm/ir/GepInstructionSyntax.java

@@ -1,6 +1,8 @@
 package org.sonar.example.llvm.ir;
 
-import com.google.common.collect.ImmutableList;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
 import org.sonar.example.llvm.ir.IrSyntaxFactory.Tuple;
 
 import java.util.List;
@@ -18,22 +20,22 @@ public GepInstructionSyntax(
     TypeSyntax pointerType, IdentifierSyntax pointer,
     List<Tuple<SyntaxToken, TypeSyntax, IntegerLiteralSyntax>> indexes) {
 
-    ImmutableList.Builder<SyntaxNode> childrenBuilder = ImmutableList.builder();
-    ImmutableList.Builder<IntegerLiteralSyntax> indexValuesBuilder = ImmutableList.builder();
-    childrenBuilder.add(
+    ArrayList<SyntaxNode> children = new ArrayList<>();
+    ArrayList<IntegerLiteralSyntax> indexValues = new ArrayList<>();
+    children.addAll(Arrays.asList(
       result, equalToken,
       gepToken, inboundsToken,
-      pointerType, pointer);
+      pointerType, pointer));
     for (Tuple<SyntaxToken, TypeSyntax, IntegerLiteralSyntax> index : indexes) {
-      childrenBuilder.add(index.first());
-      childrenBuilder.add(index.second());
-      childrenBuilder.add(index.third());
+      children.add(index.first());
+      children.add(index.second());
+      children.add(index.third());
 
-      indexValuesBuilder.add(index.third());
+      indexValues.add(index.third());
     }
 
-    this.children = childrenBuilder.build();
-    this.indexValues = indexValuesBuilder.build();
+    this.children = Collections.unmodifiableList(children);
+    this.indexValues = Collections.unmodifiableList(indexValues);
 
     this.result = result;
     this.pointer = pointer;

src/main/java/org/sonar/example/llvm/ir/IdentifierSyntax.java

@@ -1,7 +1,6 @@
 package org.sonar.example.llvm.ir;
 
-import com.google.common.collect.ImmutableList;
-
+import java.util.Collections;
 import java.util.List;
 
 public class IdentifierSyntax extends ExpressionSyntax {
@@ -14,7 +13,7 @@ public IdentifierSyntax(SyntaxToken token) {
 
   @Override
   public List<SyntaxNode> children() {
-    return ImmutableList.<SyntaxNode>of(token);
+    return Collections.singletonList(token);
   }
 
   public String name() {

src/main/java/org/sonar/example/llvm/ir/IntegerLiteralSyntax.java

@@ -1,7 +1,6 @@
 package org.sonar.example.llvm.ir;
 
-import com.google.common.collect.ImmutableList;
-
+import java.util.Collections;
 import java.util.List;
 
 public class IntegerLiteralSyntax extends ExpressionSyntax {
@@ -14,7 +13,7 @@ public IntegerLiteralSyntax(SyntaxToken token) {
 
   @Override
   public List<SyntaxNode> children() {
-    return ImmutableList.<SyntaxNode>of(token);
+    return Collections.singletonList(token);
   }
 
   public int value() {

src/main/java/org/sonar/example/llvm/ir/IrSyntaxFactory.java

@@ -1,7 +1,5 @@
 package org.sonar.example.llvm.ir;
 
-import com.google.common.base.Preconditions;
-
 import javax.annotation.Nullable;
 
 import java.util.List;
@@ -29,7 +27,9 @@ public CustomTypeSyntax customType(SyntaxToken token) {
   }
 
   public PointerTypeSyntax pointerType(TypeSyntax type, List<SyntaxToken> starTokens) {
-    Preconditions.checkArgument(starTokens.size() >= 1);
+    if (starTokens.isEmpty()) {
+      throw new IllegalArgumentException();
+    }
 
     PointerTypeSyntax result = null;
     for (SyntaxToken starToken : starTokens) {
@@ -112,7 +112,9 @@ public U second() {
     }
 
     public V third() {
-      Preconditions.checkNotNull(third);
+      if (third == null) {
+        throw new NullPointerException();
+      }
       return third;
     }
 

src/main/java/org/sonar/example/llvm/ir/LoadInstructionSyntax.java

@@ -1,7 +1,7 @@
 package org.sonar.example.llvm.ir;
 
-import com.google.common.collect.ImmutableList;
-
+import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 
 public class LoadInstructionSyntax extends InstructionSyntax {
@@ -15,10 +15,10 @@ public LoadInstructionSyntax(
     TypeSyntax pointerType, IdentifierSyntax pointer,
     SyntaxToken commaToken, SyntaxToken alignToken, SyntaxToken alignment) {
 
-    this.children = ImmutableList.of(
+    this.children = Collections.unmodifiableList(Arrays.asList(
       result, equalToken, loadToken,
       pointerType, pointer,
-      commaToken, alignToken, alignment);
+      commaToken, alignToken, alignment));
 
     this.result = result;
     this.pointer = pointer;

src/main/java/org/sonar/example/llvm/ir/NullLiteralSyntax.java

@@ -1,7 +1,6 @@
 package org.sonar.example.llvm.ir;
 
-import com.google.common.collect.ImmutableList;
-
+import java.util.Collections;
 import java.util.List;
 
 public class NullLiteralSyntax extends ExpressionSyntax {
@@ -14,7 +13,7 @@ public NullLiteralSyntax(SyntaxToken token) {
 
   @Override
   public List<SyntaxNode> children() {
-    return ImmutableList.<SyntaxNode>of(token);
+    return Collections.singletonList(token);
   }
 
 }

src/main/java/org/sonar/example/llvm/ir/PointerTypeSyntax.java

@@ -1,7 +1,7 @@
 package org.sonar.example.llvm.ir;
 
-import com.google.common.collect.ImmutableList;
-
+import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 
 public class PointerTypeSyntax extends TypeSyntax {
@@ -16,7 +16,7 @@ public PointerTypeSyntax(TypeSyntax type, SyntaxToken starToken) {
 
   @Override
   public List<SyntaxNode> children() {
-    return ImmutableList.of(type, starToken);
+    return Collections.unmodifiableList(Arrays.asList(type, starToken));
   }
 
   public TypeSyntax type() {

src/main/java/org/sonar/example/llvm/ir/RetInstructionSyntax.java

@@ -1,15 +1,14 @@
 package org.sonar.example.llvm.ir;
 
-import com.google.common.collect.ImmutableList;
-
+import java.util.Arrays;
 import java.util.List;
 
 public class RetInstructionSyntax extends InstructionSyntax {
 
   private final List<SyntaxNode> children;
 
   public RetInstructionSyntax(SyntaxToken retToken, SyntaxToken voidToken) {
-    this.children = ImmutableList.<SyntaxNode>of(retToken, voidToken);
+    this.children = Arrays.asList(retToken, voidToken);
   }
 
   @Override

src/main/java/org/sonar/example/llvm/ir/StoreInstructionSyntax.java

@@ -1,7 +1,7 @@
 package org.sonar.example.llvm.ir;
 
-import com.google.common.collect.ImmutableList;
-
+import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 
 public class StoreInstructionSyntax extends InstructionSyntax {
@@ -16,11 +16,11 @@ public StoreInstructionSyntax(
     SyntaxToken commaToken1, TypeSyntax pointerType, IdentifierSyntax pointer,
     SyntaxToken commaToken2, SyntaxToken alignToken, SyntaxToken alignment) {
 
-    this.children = ImmutableList.of(
+    this.children = Collections.unmodifiableList(Arrays.asList(
       storeToken,
       valueType, value,
       commaToken1, pointerType, pointer,
-      commaToken2, alignToken, alignment);
+      commaToken2, alignToken, alignment));
 
     this.value = value;
     this.pointer = pointer;

src/main/java/org/sonar/example/llvm/ir/SymbolicExecutor.java

@@ -1,14 +1,12 @@
 package org.sonar.example.llvm.ir;
 
-import com.google.common.base.Preconditions;
-import com.google.common.collect.Maps;
-
+import java.util.HashMap;
 import java.util.Map;
 
 public class SymbolicExecutor {
 
-  private final Map<String, BaseValue> values = Maps.newHashMap();
-  private final Map<BaseValue, BaseValue> memory = Maps.newHashMap();
+  private final Map<String, BaseValue> values = new HashMap<>();
+  private final Map<BaseValue, BaseValue> memory = new HashMap<>();
 
   public void evaluate(FunctionDefinitionSyntax f) {
     newLeftValue(f.param(), new SymbolicValue());
@@ -22,20 +20,28 @@ public void evaluate(FunctionDefinitionSyntax f) {
         StoreInstructionSyntax s = (StoreInstructionSyntax) i;
 
         BaseValue value = get(s.value());
-        Preconditions.checkState(!value.isUninitialized(), "Cannot read an uninitialized value \"" + s.value().toString() + "\"! " + i.toString());
+        if (value.isUninitialized()) {
+          throw new IllegalStateException("Cannot read an uninitialized value \"" + s.value().toString() + "\"! " + i.toString());
+        }
 
         BaseValue pointer = get(s.pointer());
-        Preconditions.checkState(!pointer.isNull(), "NPE: " + i.toString());
+        if (pointer.isNull()) {
+          throw new IllegalStateException("NPE: " + i.toString());
+        }
 
         store(pointer, value);
       } else if (i instanceof LoadInstructionSyntax) {
         LoadInstructionSyntax l = (LoadInstructionSyntax) i;
 
         BaseValue pointer = get(l.pointer());
-        Preconditions.checkState(!pointer.isNull(), "NPE: " + i.toString());
+        if (pointer.isNull()) {
+          throw new IllegalStateException("NPE: " + i.toString());
+        }
 
         BaseValue value = load(pointer);
-        Preconditions.checkState(!value.isUninitialized(), "Cannot load an uninitialized value from memory! " + i.toString());
+        if (value.isUninitialized()) {
+          throw new IllegalStateException("Cannot load an uninitialized value from memory! " + i.toString());
+        }
 
         set(l.result(), value);
       } else if (i instanceof GepInstructionSyntax) {
@@ -67,7 +73,9 @@ private void newLeftValue(IdentifierSyntax identifier, BaseValue value) {
 
   private void set(IdentifierSyntax identifier, BaseValue value) {
     String key = identifier.name();
-    Preconditions.checkState(!values.containsKey(key), "Cannot rewrite the value of: " + identifier.toString());
+    if (values.containsKey(key)) {
+      throw new IllegalStateException("Cannot rewrite the value of: " + identifier.toString());
+    }
     values.put(key, value);
   }
 
@@ -111,7 +119,7 @@ public BaseValue addressOf(int index) {
 
   public static class SymbolicValue extends BaseValue {
 
-    private final Map<Integer, SymbolicValue> indexAddresses = Maps.newHashMap();
+    private final Map<Integer, SymbolicValue> indexAddresses = new HashMap<>();
 
     @Override
     public BaseValue addressOf(int index) {