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Add generics support on RestTemplate methods #330
Extract custom JCodeModel code into a new class
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,175 @@ | ||
| package com.googlecode.androidannotations.processing; | ||
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| import java.util.ArrayList; | ||
| import java.util.List; | ||
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| import com.sun.codemodel.JClass; | ||
| import com.sun.codemodel.JCodeModel; | ||
| import com.sun.codemodel.JType; | ||
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| /** | ||
| * This class is a decorator of {@link JCodeModel} allowing usage of | ||
| * {@link #parseType(String)} and keeping each {@link JClass} found into the | ||
| * {@link EBeansHolder} buffer. This is useful for generics definition. | ||
| * <p /> | ||
| * <b>Note</b> : It's a hard-copy of a methods subset of {@link JCodeModel} with | ||
| * just one custom line (in {@link TypeNameParser#parseTypeName()} : | ||
| * | ||
| * <pre> | ||
| * JClass clazz = eBeansHolder.uniqueRefClass(s.substring(start, idx)); | ||
| * </pre> | ||
| * | ||
| * This solution was needed because JCodeModel is a final class. | ||
| */ | ||
| public class BufferedJCodeModel { | ||
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| private final EBeansHolder eBeansHolder; | ||
| private final JCodeModel codeModel; | ||
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| public BufferedJCodeModel(EBeansHolder eBeansHolder, JCodeModel codeModel) { | ||
| this.eBeansHolder = eBeansHolder; | ||
| this.codeModel = codeModel; | ||
| } | ||
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| /** | ||
| * Obtains a type object from a type name. | ||
| * | ||
| * <p> | ||
| * This method handles primitive types, arrays, and existing {@link Class} | ||
| * es. | ||
| * | ||
| * @exception ClassNotFoundException | ||
| * If the specified type is not found. | ||
| */ | ||
| JType parseType(String name) throws ClassNotFoundException { | ||
| // array | ||
| if (name.endsWith("[]")) { | ||
| return parseType(name.substring(0, name.length() - 2)).array(); | ||
| } | ||
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| // try primitive type | ||
| try { | ||
| return JType.parse(codeModel, name); | ||
| } catch (IllegalArgumentException e) { | ||
| ; | ||
| } | ||
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| // existing class | ||
| return new TypeNameParser(name).parseTypeName(); | ||
| } | ||
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| private final class TypeNameParser { | ||
| private final String s; | ||
| private int idx; | ||
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| public TypeNameParser(String s) { | ||
| this.s = s; | ||
| } | ||
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| /** | ||
| * Parses a type name token T (which can be potentially of the form | ||
| * Tr&ly;T1,T2,...>, or "? extends/super T".) | ||
| * | ||
| * @return the index of the character next to T. | ||
| */ | ||
| JClass parseTypeName() throws ClassNotFoundException { | ||
| int start = idx; | ||
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| if (s.charAt(idx) == '?') { | ||
| // wildcard | ||
| idx++; | ||
| ws(); | ||
| String head = s.substring(idx); | ||
| if (head.startsWith("extends")) { | ||
| idx += 7; | ||
| ws(); | ||
| return parseTypeName().wildcard(); | ||
| } else if (head.startsWith("super")) { | ||
| throw new UnsupportedOperationException("? super T not implemented"); | ||
| } else { | ||
| // not supported | ||
| throw new IllegalArgumentException("only extends/super can follow ?, but found " + s.substring(idx)); | ||
| } | ||
| } | ||
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| while (idx < s.length()) { | ||
| char ch = s.charAt(idx); | ||
| if (Character.isJavaIdentifierStart(ch) || Character.isJavaIdentifierPart(ch) || ch == '.') { | ||
| idx++; | ||
| } else { | ||
| break; | ||
| } | ||
| } | ||
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| JClass clazz = eBeansHolder.uniqueRefClass(s.substring(start, idx)); | ||
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| return parseSuffix(clazz); | ||
| } | ||
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| /** | ||
| * Parses additional left-associative suffixes, like type arguments and | ||
| * array specifiers. | ||
| */ | ||
| private JClass parseSuffix(JClass clazz) throws ClassNotFoundException { | ||
| if (idx == s.length()) { | ||
| return clazz; // hit EOL | ||
| } | ||
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| char ch = s.charAt(idx); | ||
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| if (ch == '<') { | ||
| return parseSuffix(parseArguments(clazz)); | ||
| } | ||
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| if (ch == '[') { | ||
| if (s.charAt(idx + 1) == ']') { | ||
| idx += 2; | ||
| return parseSuffix(clazz.array()); | ||
| } | ||
| throw new IllegalArgumentException("Expected ']' but found " + s.substring(idx + 1)); | ||
| } | ||
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| return clazz; | ||
| } | ||
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| /** | ||
| * Skips whitespaces | ||
| */ | ||
| private void ws() { | ||
| while (Character.isWhitespace(s.charAt(idx)) && idx < s.length()) { | ||
| idx++; | ||
| } | ||
| } | ||
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| /** | ||
| * Parses '<T1,T2,...,Tn>' | ||
| * | ||
| * @return the index of the character next to '>' | ||
| */ | ||
| private JClass parseArguments(JClass rawType) throws ClassNotFoundException { | ||
| if (s.charAt(idx) != '<') { | ||
| throw new IllegalArgumentException(); | ||
| } | ||
| idx++; | ||
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| List<JClass> args = new ArrayList<JClass>(); | ||
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| while (true) { | ||
| args.add(parseTypeName()); | ||
| if (idx == s.length()) { | ||
| throw new IllegalArgumentException("Missing '>' in " + s); | ||
| } | ||
| char ch = s.charAt(idx); | ||
| if (ch == '>') { | ||
| return rawType.narrow(args.toArray(new JClass[args.size()])); | ||
| } | ||
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| if (ch != ',') { | ||
| throw new IllegalArgumentException(s); | ||
| } | ||
| idx++; | ||
| } | ||
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| } | ||
| } | ||
| } |
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I think the code implemented in
EBeanHolder.parseClass()should rather be implemented here :) .