Update javadoc and visibility

src/main/java/org/stellar/base/Account.java

@@ -21,15 +21,13 @@ public Account(Keypair keypair, long sequenceNumber) {
 
  /**
  * Returns keypair associated with this Account
- * @return
  */
  public Keypair getKeypair() {
  return mKeypair;
  }
 
  /**
  * Returns current sequence number ot this Account.
- * @return
  */
  public long getSequenceNumber() {
  return mSequenceNumber;

src/main/java/org/stellar/base/AccountMergeOperation.java

@@ -18,7 +18,6 @@ private AccountMergeOperation(Keypair destination) {
 
  /**
  * The account that receives the remaining XLM balance of the source account.
- * @return
  */
  public Keypair getDestination() {
  return mDestination;
@@ -67,7 +66,6 @@ public Builder setSourceAccount(Keypair sourceAccount) {
 
  /**
  * Builds an operation
- * @return
  */
  public AccountMergeOperation build() {
  AccountMergeOperation operation = new AccountMergeOperation(mDestination);

src/main/java/org/stellar/base/AllowTrustOperation.java

@@ -23,23 +23,20 @@ private AllowTrustOperation(Keypair trustor, String assetCode, boolean authorize
 
  /**
  * The account of the recipient of the trustline.
- * @return
  */
  public Keypair getTrustor() {
  return mTrustor;
  }
 
  /**
  * The asset of the trustline the source account is authorizing. For example, if a gateway wants to allow another account to hold its USD credit, the type is USD.
- * @return
  */
  public String getAssetCode() {
  return mAssetCode;
  }
 
  /**
  * Flag indicating whether the trustline is authorized.
- * @return
  */
  public boolean getAuthorize() {
  return mAuthorize;
@@ -122,7 +119,6 @@ public Builder setSourceAccount(Keypair sourceAccount) {
 
  /**
  * Builds an operation
- * @return
  */
  public AllowTrustOperation build() {
  AllowTrustOperation operation = new AllowTrustOperation(mTrustor, mAssetCode, mAuthorize);

src/main/java/org/stellar/base/Asset.java

@@ -2,13 +2,17 @@
 
 /**
  * Base Asset class.
+ * @see <a href="https://www.stellar.org/developers/learn/concepts/assets.html" target="_blank">Assets</a>
  */
 public abstract class Asset {
+ Asset() {
+ //
+ }
+
  /**
  * Creates one of AssetTypeCreditAlphaNum4 or AssetTypeCreditAlphaNum12 object based on a <code>code</code> length
  * @param code Asset code
  * @param issuer Asset issuer
- * @return
  */
  public static Asset createNonNativeAsset(String code, Keypair issuer) {
  if (code.length() >= 1 && code.length() <= 4) {
@@ -23,7 +27,6 @@ public static Asset createNonNativeAsset(String code, Keypair issuer) {
  /**
  * Generates Asset object from a given XDR object
  * @param xdr XDR object
- * @return
  */
  public static Asset fromXdr(org.stellar.base.xdr.Asset xdr) {
  switch (xdr.getDiscriminant()) {
@@ -48,7 +51,6 @@ public static Asset fromXdr(org.stellar.base.xdr.Asset xdr) {
 
  /**
  * Generates XDR object from a given Asset object
- * @return
  */
  public abstract org.stellar.base.xdr.Asset toXdr();
 }

src/main/java/org/stellar/base/AssetTypeCreditAlphaNum.java

@@ -2,6 +2,7 @@
 
 /**
  * Base class for AssetTypeCreditAlphaNum4 and AssetTypeCreditAlphaNum12 subclasses.
+ * @see <a href="https://www.stellar.org/developers/learn/concepts/assets.html" target="_blank">Assets</a>
  */
 abstract class AssetTypeCreditAlphaNum extends Asset {
  protected final String mCode;
@@ -14,15 +15,13 @@ public AssetTypeCreditAlphaNum(String code, Keypair issuer) {
 
  /**
  * Returns asset code
- * @return
  */
  public String getCode() {
  return mCode;
  }
 
  /**
  * Returns asset issuer
- * @return
  */
  public Keypair getIssuer() {
  return mIssuer;

src/main/java/org/stellar/base/AssetTypeCreditAlphaNum12.java

@@ -5,6 +5,7 @@
 
 /**
  * Represents all assets with codes 5-12 characters long.
+ * @see <a href="https://www.stellar.org/developers/learn/concepts/assets.html" target="_blank">Assets</a>
  */
 public class AssetTypeCreditAlphaNum12 extends AssetTypeCreditAlphaNum {
 

src/main/java/org/stellar/base/AssetTypeCreditAlphaNum4.java

@@ -5,6 +5,7 @@
 
 /**
  * Represents all assets with codes 1-4 characters long.
+ * @see <a href="https://www.stellar.org/developers/learn/concepts/assets.html" target="_blank">Assets</a>
  */
 public class AssetTypeCreditAlphaNum4 extends AssetTypeCreditAlphaNum {
 

src/main/java/org/stellar/base/AssetTypeNative.java

@@ -4,6 +4,7 @@
 
 /**
  * Represents Stellar native asset - <a href="https://www.stellar.org/developers/learn/concepts/assets.html" target="_blank">lumens (XLM)</a>
+ * @see <a href="https://www.stellar.org/developers/learn/concepts/assets.html" target="_blank">Assets</a>
  */
 public class AssetTypeNative extends Asset {
 

src/main/java/org/stellar/base/ChangeTrustOperation.java

@@ -20,15 +20,13 @@ private ChangeTrustOperation(Asset asset, long limit) {
 
  /**
  * The asset of the trustline. For example, if a gateway extends a trustline of up to 200 USD to a user, the line is USD.
- * @return
  */
  public Asset getAsset() {
  return mAsset;
  }
 
  /**
  * The limit of the trustline. For example, if a gateway extends a trustline of up to 200 USD to a user, the limit is 200.
- * @return
  */
  public long getLimit() {
  return mLimit;
@@ -85,7 +83,6 @@ public Builder setSourceAccount(Keypair sourceAccount) {
 
  /**
  * Builds an operation
- * @return
  */
  public ChangeTrustOperation build() {
  ChangeTrustOperation operation = new ChangeTrustOperation(mAsset, mLimit);

src/main/java/org/stellar/base/CreateAccountOperation.java

@@ -21,15 +21,13 @@ private CreateAccountOperation(Keypair destination, long startingBalance) {
 
  /**
  * Amount of XLM to send to the newly created account.
- * @return
  */
  public long getStartingBalance() {
  return mStartingBalance;
  }
 
  /**
- * Account that is created and funded.
- * @return
+ * Account that is created and funded
  */
  public Keypair getDestination() {
  return mDestination;
@@ -83,7 +81,7 @@ public Builder(Keypair destination, long startingBalance) {
  /**
  * Sets the source account for this operation.
  * @param account The operation's source account.
- * @return
+ * @return Builder object so you can chain methods.
  */
  public Builder setSourceAccount(Keypair account) {
  mSourceAccount = account;
@@ -92,7 +90,6 @@ public Builder setSourceAccount(Keypair account) {
 
  /**
  * Builds an operation
- * @return
  */
  public CreateAccountOperation build() {
  CreateAccountOperation operation = new CreateAccountOperation(mDestination, mStartingBalance);

src/main/java/org/stellar/base/CreatePassiveOfferOperation.java

@@ -25,31 +25,27 @@ private CreatePassiveOfferOperation(Asset selling, Asset buying, long amount, St
 
  /**
  * The asset being sold in this operation
- * @return
  */
  public Asset getSelling() {
  return mSelling;
  }
 
  /**
  * The asset being bought in this operation
- * @return
  */
  public Asset getBuying() {
  return mBuying;
  }
 
  /**
  * Amount of selling being sold.
- * @return
  */
  public long getAmount() {
  return mAmount;
  }
 
  /**
  * Price of 1 unit of selling in terms of buying.
- * @return
  */
  public String getPrice() {
  return mPrice;
@@ -116,7 +112,7 @@ public Builder(Asset selling, Asset buying, long amount, String price) {
  /**
  * Sets the source account for this operation.
  * @param sourceAccount The operation's source account.
- * @return
+ * @return Builder object so you can chain methods.
  */
  public Builder setSourceAccount(Keypair sourceAccount) {
  mSourceAccount = sourceAccount;
@@ -125,7 +121,6 @@ public Builder setSourceAccount(Keypair sourceAccount) {
 
  /**
  * Builds an operation
- * @return
  */
  public CreatePassiveOfferOperation build() {
  CreatePassiveOfferOperation operation = new CreatePassiveOfferOperation(mSelling, mBuying, mAmount, mPrice);

src/main/java/org/stellar/base/Keypair.java

@@ -109,15 +109,13 @@ public static Keypair random() {
 
  /**
  * Returns the human readable address encoded in strkey.
- * @return
  */
  public String getAddress() {
  return StrKey.encodeStellarAddress(mPublicKey.getAbyte());
  }
 
  /**
  * Returns the human readable secret seed encoded in strkey.
- * @return
  */
  public String getSecretSeed() {
  return StrKey.encodeStellarSecretSeed(mPrivateKey.getSeed());
@@ -178,7 +176,6 @@ public byte[] sign(byte[] data) {
  /**
  * Sign the provided data with the keypair's private key and returns {@link DecoratedSignature}.
  * @param data
- * @return
  */
  public DecoratedSignature signDecorated(byte[] data) {
  byte[] signatureBytes = this.sign(data);

src/main/java/org/stellar/base/ManagerOfferOperation.java

@@ -30,39 +30,34 @@ private ManagerOfferOperation(Asset selling, Asset buying, long amount, String p
 
  /**
  * The asset being sold in this operation
- * @return
  */
  public Asset getSelling() {
  return mSelling;
  }
 
  /**
  * The asset being bought in this operation
- * @return
  */
  public Asset getBuying() {
  return mBuying;
  }
 
  /**
  * Amount of selling being sold.
- * @return
  */
  public long getAmount() {
  return mAmount;
  }
 
  /**
  * Price of 1 unit of selling in terms of buying.
- * @return
  */
  public String getPrice() {
  return mPrice;
  }
 
  /**
  * The ID of the offer.
- * @return
  */
  public long getOfferId() {
  return mOfferId;
@@ -143,7 +138,7 @@ public Builder setOfferId(long offerId) {
  /**
  * Sets the source account for this operation.
  * @param account The operation's source account.
- * @return
+ * @return Builder object so you can chain methods.
  */
  public Builder setSourceAccount(Keypair account) {
  mSourceAccount = account;
@@ -152,7 +147,6 @@ public Builder setSourceAccount(Keypair account) {
 
  /**
  * Builds an operation
- * @return
  */
  public ManagerOfferOperation build() {
  ManagerOfferOperation operation = new ManagerOfferOperation(mSelling, mBuying, mAmount, mPrice, mOfferId);